JPH04505407A - Improvements in and to external fixation devices - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] “Improvements in and to External Fixation Devices” This invention is for use in the treatment of bone fractures. external fixation devices, more specifically modifications that can provide dynamic axial movement. Concerning improved unilateral or unilateral telescoping single frame fixation devices. do.

The purpose of an external fixator is to allow the patient to move at the adjacent joint while allowing healing to occur. The point is that the broken bone fragments and sections are held together by pins. child In order to achieve this goal, the fixator must be able to handle the loosening loads without causing excessive movement at the fracture site. The use of a cuff fixation device that must be sufficiently rigid and stiff to support the , a well-established and recommended form of injury to various limbs. , many different fixation devices have been designed and are known to the applicant. Ru. Their inner shells generally appear to be satisfactory, but are largely unnecessary. complex and do not provide the degree of stiffness needed for optimal bone healing. Seem. In an attempt to increase stiffness, designers (including two or more external fixators) ) have relied on multi-sided or multi-axis devices, but such devices are largely difficult to handle. It was difficult and technically complex.

Additionally, their large size makes accessing the wound and handling soft tissue difficult.

Another drawback associated with known external fixation devices is the clamping of the pins and their The surgeon can easily attach the device to the main body with limited movement range of the components. This was something that could not be adjusted quickly. This makes it difficult to insert the retaining pin. Moreover, it has been difficult to correct the rotational misalignment of the fractured bone. Change In addition, the range in which the orientation of each set of holding pins relative to the main body of the fixing device can be changed in space is There is a limit. That kind of reorientation is important because it doesn't matter where the fracture occurred or whether it's in a large part of the bone. In order to allow the device to be easily installed regardless of whether it is in a narrow space and This is necessary in order to ensure that the device body is placed parallel to the longitudinal axis of the bone.

Prior art external fixation devices consisting of However, a common problem with this type of device is that the retaining pins and the body of the fixation device may be damaged during walking. This is the point where a high bending moment occurs. After considering these high bending modes, This is because the telescopic parts of the device are subject to especially sliding friction, and the telescopic parts are made of the same metal. galling may occur if the material is made of metal or metal with a high coefficient of friction. I know that.

These devices are fixed by an external motor (referred to as "active activation J"). A consistent dynamic axial movement (immediately (i.e., telescopic movements), but without consistent and reliable reception during walking. cannot generally be relied upon to provide dynamic activity.

Dynamic axial movement is ensured through expansion and contraction of the device, but is not guaranteed due to static indeterminacy of the fixture. It is important that the fixture is sufficiently stable as it will not hold. axis of repetition directional movement causes the telescoping device to relax or immobilize over time, which then increases the stiffness of the fixture. and may significantly alter the potency of activity. For example, regarding prior art devices consisting of A significant related problem is their rotational instability. One solution to this problem The solution was to use a key lock system. i.e. in that case, inside and outside The telescoping member is partially circular and the key fits into a groove that runs along the inner member. engaged. Rotational stability is increased by tighter-fitting key locks. However, this limits the contact area of the key lock. key pin A loose-fit key lock that engages a keyway formed in the inner member is Although this complication is avoided, adequate rotational stability cannot be provided.

Furthermore, fixtures that rely on rolling friction rather than sliding friction between telescopic parts have also been developed. These are roller bearings that rotate within the ball bearing race. I am using Google.

However, the micromovements required for external fixators are on the order of 1 mm or less. Due to the fact that the ball or roller bearing that performs this motion rolls rather than rocking and thus performing a Brinell. Such brinelling is , instability and or galling that must be avoided in dynamic external fixtures. It is the cause.

Additionally, another drawback of some known unilateral telescoping external fixators is that they Those that change or change the rigidity of the device in response to the axial movement of the telescoping parts. It is the instability of Greater stiffness is needed in the early stages of fracture healing and It has been found that a small stiffness is sufficient after that. Passive movement of the telescoping parts of the fixation device Measures are provided to prevent bone fractures from occurring at an early stage until a predetermined load is exceeded. It is desirable that

It is therefore an object of the present invention to provide a simple design, easy handling, and pin clamp orientation. Orientation and positioning of the retaining pin fixed to the clamp. to provide an improved one-sided telescopic fixation device with the flexibility to change the be.

Another object of the invention is to provide a flexible system without crimping telescoping parts (both active and passive). ) Improved one-sided telescoping that provides thorough, reliable and efficient activity To provide an external fixation device.

Yet another object of the present invention is to easily change the resistance to axial movement during fracture healing. The objective of the present invention is to provide an improved unilateral telescoping external fixation device that allows for improved unilateral telescoping.

Yet another object of the invention is to promote faster healing and enable faster ambulation. Improved single-sided telescopic external fixation that can provide extremely stable and rigid precision We are in the process of providing equipment.

Accordingly, in accordance with one aspect of the present invention, an improved one-sided telescoping external orthopedic The fixation device provides relative axial alignment along an axis coincident with the central longitudinal axis of the device. A pair of telescopically engaged inner and outer parts adapted to reciprocate in the axial direction releasable locking means for releasably locking the parts against directional movement; an elongated telescoping device consisting of an elongate telescopic device spaced longitudinally of the clamp and transversely thereof; Telescoping component for clamping one or more extended orthopedic retention pins a pair of pin clamps each carried on the top, and a pair of pin clamps carried on the top to connect each said clamp clamp connection means provided on each of the telescoping parts of the elongated telescoping device; and each of the clamp connecting means has a first axis of rotation aligned with the longitudinal axis of the telescoping device. It consists of a clamp holder spaced radially from the direction axis. The said clamp holder is now in a released state with its associated said clamp. It is designed so that it can rotate integrally around the first axis when the above-mentioned clamp is The pump holder is adjustable for longitudinal sliding movement along its first axis. , thereby causing the associated spacing position of said clamp to be and the telescoping device (measured along the first axis). so that each said clamp has its longitudinal The clamp rotates entirely around a second axis of rotation extending in the direction and perpendicular to the first axis. It is rotatably supported by the clamp holder so that it can be rotated.

Regarding the above configuration, the pin clamp of the fixation device, together with the set of pins, It can be rotated from the vertical plane. The pin is now attached to the end of the bone. It now sits flat, making it desirable for difficult breaks in long bones.

This arrangement further allows the pin clamp to be tilted through a wide arc; This is required for spiral and vertical fractures with a wide angular range of fracture surfaces.

The ability of the clamp to slide horizontally allows for alignment of the bone without sacrificing the axial alignment of the fixation device. The fragment can be rotated, and the insertion angle of the pin inserted into the bone can be changed widely. Ru. The misalignment of the longitudinal axis of the fixation device with that of the tibia is due to the dynamic axis of the device. This will reduce the potential for movement. Known active fixation devices Allows rotation of the bone fragment by an axial deviation of the fixation device body from the longitudinal axis of the I have to.

Preferably each said clamp connection means (or at least that on the outer telescoping part) ) further includes a bracket or a bracket slidably supported on the associated telescopic part. consisting of a connector means, in which the entire clamp connection means is connected to its associated When the above clamp is unlocked, it slides in the longitudinal direction of the above telescopic device. can. At least one pin clamp along the entire length of the outer telescopic part By positioning the inner pin at this location, the separation of the inner pins is kept to a minimum. preferred Preferably, one of the bracket means is fixed to the free end of the inner telescoping member and the other one bracket means is slidably positionable along the length of the outer telescoping component. It looks like this.

Thus, separation of the pin clamp and pin requires their relative axial separation. No adjustments have been made to the telescoping parts to better contrast with prior art devices that require do not need. This further ensures that the telescoping parts are compatible over a major portion of the length of the fixation device. contact with each other, resulting in reduced bending motion during dynamic axial movement and Reduces conditions similar to "sticking" of equipment.

In another preferred form of the invention, the bracket means rotates on the telescoping part thereof. is rotatably supported, so that the clamp connection means is rotatably supported in the longitudinal direction of the telescoping device. rotationally adjusted about an axis coincident with or parallel to the adaxial axis and relative to a telescoping device 3 Another preferred form of the invention is adapted to assume different angular positions. In this case, each of the above-mentioned clamp connecting means is connected between the bracket means and the clamp holder. It consists of interconnected ring-turning blocks, which are used to release locks. when in the released state, perpendicular to both the axis of the telescoping device and the first axis above. It is rotatable around the extended third axis. Now along the clamp holder Allows the block to rotate around the third axis and provides support for the expansion and contraction device. It is immersed so that it can be set in several different angular positions.

Preferably, the connector or bracket means surrounds the associated telescoping part and e.g. Mountings with locking elements, such as clamp screws or bolts, consist of There is. When the locking member is tightened, the above mounting will clamp the body against the telescopic part. the telescopic device, causing both rotational movement and longitudinal movement relative to the telescoping device. The connector means locking so that it does not. Preferably, the mounting is on the body of the fixation device. Consisting of a pair of hinge halves hinged together along an axis parallel to the axis and clamp their free ends together on both sides of the fixation device body with clamps or locking screws. There are lamps. This allows even if the fixation device remains attached to the patient. The clamp can be easily removed from or added to the fixing device. Ru.

Preferably, the pin clamp is such that the fixation device body is swung from one side of the limb to the other. It has a 360 degree horizontal angular range that allows for soft tissue closure during surgery. provides full access to the wound for wound treatment.

Furthermore, in another preferred embodiment, each said clamp holder rotates about said first axis. a pair of semicircular fingers or jaw members which are rotatably journalled and carry a pair of semicircular fingers or jaw members at their distal ends; It consists of a short length of pin or shaft that extends laterally. those fingers Alternatively, the inner circumferential wall of the jaw member forms a through hole that rotatably accommodates each of the above-mentioned clamps. The clamp is rotated through 360 degrees. with this Next, the orientation of the pin of the fixation device held there can be changed in the same way. There is.

According to another aspect of the invention, relative axial sliding along the longitudinal axis of the telescoping device is provided. A main telescoping device consisting of a pair of elongated telescopically engaged parts adapted for dynamic movement. An improved one-sided telescoping external fixation device constructed from the above parts is provided. The outer one forms a housing with a through hole, and the inner one of the above parts forms a housing with a through hole. forming a rod that engages the hole in a sliding fit and is not rotatable about said axis; The shape of the lot and the hole each have at least one flat surface. It has a non-circular shape, and the surface of the hole is made of a hard polymer material. Sliding friction between the parts during the relative axial sliding movement is kept to a minimum.

Preferably, the housing has a cylindrical outer wall shape and is held together by a clamp screw. It consists of two fixed axial halves of the same shape. However, the housing The -i member is also formed.

It must be the same for the large surface of the cylindrical housing inside which the piston moves and for the internal rod. By using materials that are thinner, sliding friction can be reduced (e.g. when using similar metals) (compared to It's unlikely to happen. In experiments conducted by the inventor of the present application, suitable polymeric materials and stainless steel were used. The combination of metals is a pair of the same metals or e.g. stainless steel and hard chrome. Compare to non-identical metals such as stainless steel or stainless steel and brass It has been shown that this results in the greatest improvement in frictional resistance.

Preferably, the holes in the cylindrical housing are made of acetal or Hard polymer materials such as special materials sold under ALj (polyoxymethylene) Lined with layers. The lining is inserted into the hole and has a coextensive elongated flat surface. provided by flat strips, each strip having a large flat surface extending along the length of the hole. I support it. Any hard weight with high friction/abrasion resistance and low coefficient of friction Composite wood may also be used. In addition to acetal, other examples include high-density polyethylene and polypropylene. It can also be pyrene.

In a preferred arrangement, the holes are rectangular and the lots have a rectangular cross-sectional shape. So The shape of can also be triangular.

In another preferred configuration, the lot has curved sidewall surfaces along its longitudinal edges. It consists of flat upper and lower surfaces connected by A pair of straight rods fixed in a cylindrical hole with the flat surface of the insert member engaging against the flat surface. It is constructed from radially opposed generally D-shaped insert members. Above insert The seat member is formed from a hard polymeric material.

Preferably, the rod extends the entire length of the housing and the rod end of the housing that allows limited relative axial perturbation between the housing and the housing. A limiting wall is provided at its end, which cooperates with the radial abutment surface of. That kind of movement is Preferably it is on the order of 5 mm. In this way, the lot is It maintains contact with the hole across the body, which increases stiffness and rigidity, which in turn increases activity. To minimize the effects of possible bending moments.

In yet another aspect of the invention, the improved single-sided external fixation device comprises: It consists of a pneumatically operated or electric coaxially arranged motor at the end of the housing. ing. The motor provides dynamic axial movement or dynamic axial loading of fractured bone fragments. It is designed to give.

Preferably, the motor has an adjustment of 0.1 to 1.0 in+ at a frequency of about 0.5 Hz. It is configured to perform minimal movement with possible deflection.

In yet another aspect of the invention, the telescoping device includes axial separation of the telescoping components and then They are arranged coaxially within the device to perform bone lengthening procedures to separate the fragments. A removable calibrated rod constructed from a longitudinally extending threaded rod to ensure An axial separation means is provided at the distal end.

In yet another aspect of the configuration, the telescoping component of the telescoping device is mounted at the distal end of the outer component of the ice bag. The telescopic part is removably housed and can be moved until a set (predetermined) load is exceeded. adjustable axial to resist motion and prevent relative axial movement of telescoping parts It now cooperates with an adjustable spring mechanism configured to provide a loading force. ing. The adjustable spring has a dynamic axial position before the set load is applied. Prevents movement from occurring. This load is set high during the early stages of fracture healing. and is also set low in the later stages of fracture healing.

In order to more fully explain the invention of the presenter, some examples are provided with reference to the accompanying drawings. will be explained below.

FIG. 1 is a perspective view of an external fixation device according to a first embodiment of the present invention, FIG. 2 is an end view of the fixation device taken in the direction of arrow 2 in FIG. 1; FIG. 3 is an exploded perspective view of the clamp assembly shown in FIG. 1; FIG. 4 shows a longitudinal cross-section of the telescoping device shown in FIG. (the pull assembly is omitted).

FIG. 5 is a partial cross-sectional, cutaway perspective view of the telescoping device of FIG. 4; FIG. 6 is a radial cross-sectional view taken along $6-6 of FIG. 4;

FIG. 7 is a sectional view similar to FIG. 6 of the telescopic device according to the second embodiment of the present invention, FIG. 8 shows the longitudinal length of an axial deflection device for use with the fixation device shown in FIG. FIG. 9 is an axial cross-sectional view for use with the fixation device shown in FIG. FIG. 10 is a longitudinal cross-sectional view of the loading device, and FIG. 10 shows the clamp shown in FIG. 1 is a schematic elevational view of the fixation device of the invention showing the components of the adjustment achieved in the assembly; It is a diagram.

In the embodiment illustrated in FIGS. 1-4, the orthopedic external fixation device 10 is , the outer cylinder housing 12, in which the telescopic rod 13 is housed so as to reciprocate, is and the coaxial housing 12 and the head end of the rod, respectively. clamp connectors 15, 16 and associated with each said clamp connector 15, 16. a clamp holder 17.18 and rotatable by the clamp holder 17.18; and a pin retaining clamp 19,20 each supported. each clamp 19.20 are arranged so as to be spaced apart in their longitudinal direction and project in their transverse direction. A transversely extending through opening 25 is provided for accommodating the extended fixation device retaining pin 27. pairs of opposing grooves clamped together by clamp screws 24 to form It consists of clamp plates 19', 19' and 20', 20'. pin 27 has a known structure.

In this embodiment, the clamp connectors 15, 16 are connected to the cylindrical housing 12, respectively. a circular enlarged head 30 (formed in two halves) at the free end of the pad 13; The surrounding structure consists of a pair of hinged connector sections 28,29. , the connector portions 28, 29, when in their relaxed state, are clamp connectors. 15.16 is rotatable about an axis coincident with the central longitudinal axis of the telescoping device 1111. I am trying to make it possible.

In addition, in the case of the connector 15, sliding displacement in the longitudinal direction along the length of the housing 12 is also possible. I'm trying to make it happen. Clamp screw 33 in tightened state (Figs. 2 and 3) (see) and the inside of the connector part 28.29 does not move the bracket 15.16 six times. In order to ensure that the cylinder housing 12 and the piston head 30 are They are engaged in a clamping manner.

As shown in FIG. It is a three-piece assembly consisting of an integral member 31 including 9'. . The pieces shall be die-cast of aluminum or aluminum alloy. Can be done. In this configuration pin 27 can be inserted without removing the clamp from its holder. It is removed.

A ring rotation block 34 spaced radially from the cylindrical housing of the telescoping device 11 includes: are supported on portions 28 of connectors 15, 16, each block 34 being a block A transverse direction extending inward from one end and communicating with a circular through hole 37 extending laterally. horizontal slots 35 are formed. The through hole 37 has a clamp holder 1 A solid cylindrical pin or shaft 39 forming part of 7.18 is rotatably housed. . Each prosoge 34 is rotatable on a short shaft 38 projecting radially from the side of one section 28. and is releasably locked thereto by a clamp screw 32. When the screw 32 is loosened, the block 34 is attached to the holders 17 and 18. , which intersects the central axis of the device 10 at right angles and! perpendicular to the axis of 39 This means that the ring can be rotated around the axis.

Around the axis of the shaft 39 between the pin clamp 19, 20 holder 17, 18 and the pin 27 Rotation of the pin is desirable in situations involving bones of varying diameters, but It is designed to be inserted in the direction or in the transverse direction.

A cover member 40 has a threaded plug that threads into a threaded central hole formed in the shaft 38. , prevents the block 34 from being penetrated.

When tightened, the clamp screw 41 performs a rotational and sliding opening movement relative to the block 34. Friction clamp onto the shaft 39 to prevent damage. Of course, if the screw 41 is in its loosened state, Once there, the clamp holder 17.18 is rotated about the axis of the shaft 39 and oriented in the desired direction. It is recognized that the shaft 39 is locked when Ru.

Each clamp holder 17, 18 further accommodates clamps 19, 20 in a clamped state. a pair of semi-circular projections 43, 43' that cooperate together to form a circular opening; are doing. Adjustment screw 44 is used to secure projections 43, 43' together. , and when loosened, the clamps 19 and 20 are set to the desired angle (with respect to the pin 27). ) so that they can be rotated as one unit.

The clamp holder 17.18 rotates about the axis of the shaft 39 and extends along that axis. Because it can be slid in the hand direction, it is easy to insert a retaining pin into bone fragments, such as the tibia. the bone fragment without changing the longitudinal alignment of the housing 12 with respect to the axis of the bone. The clamp 19°2o is aligned with the axis of the shaft 39. Since the device can integrally rotate around an axis perpendicular to the make it suitable for approaching. These features explain how pink run 19 is horizontally displaced from the housing 12 and its orientation is changed. It is clear from Figure 10 of the illustrated drawings that a wide range of pin angles is possible. degree can be used reliably.

Since the clamp connectors 15 and 16 can slide along the cylindrical housing 12, This facilitates optimal positioning of the holding pin 27 with respect to the fracture site. Advantages of the present invention , such that more than one clamp connector is supported on the cylindrical housing 12. and flexibility in the range of motion experienced by the clamp connector, holder, and clamp. The device 11 is designed to increase rigidity by allowing for "triangulation" due to the faucetability. Pins can be precisely positioned on both sides of the housing 12.

A hinge 45 pivotally connecting portions 28.29 of connector 15.16 connects device 1 1 is attached to the bone so that the connector can be easily removed from the housing 12. Make it.

Referring to FIGS. 4 to 6 of the drawings, the rod 13 of the telescoping device 11 is Constructed from stainless steel with a polished outer surface and rectangular horizontal It is a cross section.

The rod 13 is slidable in a sliding fit with a hole 46 extending over the entire length of the housing 12. This hole 46 also has a rectangular cross section. The housing 12 , preferably made of aluminum, and are attached together by screws 47. It consists of two diametrical halves 12', 12'. Hole 46 is It has a structure that minimizes the sliding resistance between the rod 13 and the six times 46. For example, Eltoacetal has a small friction coefficient and good surface lubricity. It is lined by a replaceable strip 49 of hard polymeric material.

As a result, the moving parts of the device 11 are subjected to more bending moments than in conventional technology. It is difficult to get stuck even if you cut it. Of course, the liner 49 is inserted into the hole 46 of the housing 12. It may also be in the form of an angled insert that fits snugly. four thin A piece 49 is loosely held in the hole 46 against each flat surface formed in the hole 46. , so that they can be easily replaced if necessary.

The outer end of the rod 13 terminates in an enlarged head 30 fixed to it and A connector 16 is clamped around the other end of the inner or distal end of the rod 13. is screwed to the limit block 50 via a screw plug 52 coaxial therewith. . Block 50 is housed within and secured to extension piece 53 of housing 12. At the same time, the rod 13 passes through a preset range depending on the healing status of the fracture. The block 50 is designed to limit the axial movement of the block 50 in the direction of extension. It cooperates with a radial stop flange 54 to constrain movement of the rod. of the rod Movement in the retracting direction is performed by the end wall of the rod 13 that abuts the other side of the flange 54. It is restricted.

Extension piece 53 had internal threads 58 to accommodate threaded end plug 59 It supports a slidable connecting collar 57.

The proximal end of housing 12 includes an end block attached to the end of housing 12. A lock collar 60 is provided which has an internal thread that threads into the external thread of the lock 61. The block 61 has a central opening through which the rod 13 passes. Its composition is The end of the collar 60 as the locking collar 60 is rotated to its locked position. The wall 62 abuts the opposing wall 64 on the head 30 of the rod 13, and when further tightened, the rod The door 13 is moved axially in the extending direction until the limit block 50 comes into contact with the flange 54. is displaced in the direction. At that time, the rod 13 is locked so that it cannot move, and the The ring 12 and rod 13 are fixed relative to each other. Its lock status is This is required when shortening and damage of the board 13 must be prevented.

When the lock nut 60 is in its loosened or unlocked condition, one device is accomplished through one walking activity. a motor device (not shown) attached via the roller 57 and coaxially aligned therewith; It is subjected to dynamic axial loading which is either 'active' carried out through. preferably In an alternative embodiment shown in FIG. 7, the motor is pneumatically or electrically operated. The rod 65 is formed of two flat surfaces joined by two curved side walls. On the other hand, the hole in the housing 12 is circular and made of a hard polymeric material. A pair of inserts 66 are fitted inside. The insert 66 has a low shape. and is rotated by a grub screw (not shown) extending through the wall of housing 12. He is restrained to do whatever he wants. To say it again, there is an insert 66 made of monopolymer material. This greatly reduces the effect of sliding resistance.

In the above embodiments, each of the clamp screws has a hexagonal recess or recess in its head. The rotational adjustment of these screws is performed using a known hex key spanner.

Referring to FIG. 8 of the drawings, a calibrated screw device 67 is illustrated. , which is attached to the device 11 via the collar 57 (by removing the end plug 59) . The device 67 cooperates with the rod 13 to provide a controlled connection between the rod 13 and the cylinder 12. relative axial movement is performed, followed by extraction of the bone fragment.

This is necessary to allow longitudinal manipulation of the bone. This device 67 , an adjustment member 68 having a screw plug 69 that is screwed into a screw hole in the main body portion 70. The body portion 70 is then threadedly connected to the collar 57. Plug 69 protrudes through the body portion 70 and is located between the rod 13 and the intermediate element. (block 50 has been removed).

Referring to FIG. 9 of the drawings, an axial loading device 71 is illustrated, which It is adapted to be attached to the collar 57 of the coaxial device t11. Fitting W7 1 includes an adjustment nut 72 screwed onto the tubular body 7!3, and an adjustment nut 72 and an inner part of the tubular body 73. An elastic compression spring 74 housed in the spring 74 is provided. The spring 74 is Then, when the device 71 is so installed, it projects axially from the end of the tubular body 73. Moreover, it is in pressure contact with the pin 75 which is in contact with the end of the rod 13. The device 71 , thus cooperating with the rod 13, until the set or predetermined load is exceeded. Adjustable spring resistance to movement of rod 13 to prevent any movement. give. As explained above, greater stiffness is needed in the early stages of fracture healing. , and later a small stiffness is required. Adjustable spring mechanism sets Designed to prevent dynamic axial movement before load is applied. necessary and The applied load is set high in the early stages of the fracture, then lowered in the later stages of the fracture. It is set as follows.

The material selection for the telescoping parts 12.13 will be different from those described above. for example , the rod 13 is made of titanium, anodized aluminum, and other materials. The housing 12 may be any suitable hard plastic material. rod 1 3 is a suitable material with good surface lubricity and low coefficient of friction, such as Teflon. It can also be lined or coated with a wear-resistant plastic material. Furthermore It is also possible to coat the housing 12 six times with a layer of hard polymeric material.

Summarizing and considering the above embodiments, it can be seen that the present invention is highly flexible and fully adjustable. possible, easy to use, thoroughly reliable and effective for imparting dynamic axial motion. It will be appreciated that the present invention provides an improved one-sided external fixation device.

summary The present invention provides limited axial reciprocating movement relative to each other along the longitudinal axis. a telescoping device comprising telescopically engaged inner and outer parts (12, 13) arranged to Place i! Regarding an improved one-sided telescopic external fixation device composed of (11) .

The outer part (12) has a central hole extending therethrough and the inner part (12) has a central hole extending therethrough. 1) engages the hole in a sliding fit and extends over its entire length. inner parts cannot rotate around the axis. Therefore, the hole was made of hard polymer material. The inner parts (1, 3) are preferably made of metal.

The fixation device further comprises an inner part (13) with the inner one adjacent to the proximal end. The outer part (12 ) a pair of orthopedic pin clamp assemblies adjustably carried on the above components; A releasable lock that releasably locks (12, 13) from moving in the above axis. and a link means (60).

international search report InLearnsllo*sl＾pj+tlonNo, Kgo/All Kagorienga+ n+erna+Ioh・(^ppsNor+grasp, ni'r/A[+917IX I Roro 5m +ro’+m m’rrw 5EAROI REPGIT cn Dm positive rule is Shiyama M guest's Sukan l area, Nite is JEtc OF NKtEx

Claims (27)

[Claims] 1. to perform a relative axial sliding movement along the longitudinal axis of the main telescoping device. from a main telescoping device which itself consists of a pair of elongated telescopingly engaged parts that The outer part of the above part is a housing with a hole extending through it. the inner part of the part is configured to be slidably fitted into the hole and constitutes a rod housed so as not to rotate around an axis, and the rod and the above The hole has a non-circular shape with at least one flat surface, so that the hole has a non-circular shape with at least one flat surface. The surfaces are constructed of a hard polymeric material, which allows them to be held together during relative axial sliding movement. Improved telescopic external fixation characterized by minimized sliding friction between parts Device. 2. Claims: The rod and the hole have a rectangular or square shape. The improved telescoping external fixation device of paragraph 1. 3. Each of the flat sides of the hole is lined with a layer of said hard polymeric material. 3. The improved telescoping external fixation device of claim 2. 4. A replaceable piece of polymeric material coextensive with the hole and in contact with the hole surface. An improved telescoping device according to claim 2, comprising an elongated flat strip. Part fixing device. 5. The rod is preferably made of metal such as stainless steel, or The improved polymeric material according to any one of the preceding claims, wherein the polymeric material is an acetal. Telescoping external fixation device. 6. The housing has a cylindrical outer wall and is secured together by a securing means. Any one of the above claims consisting of two identically shaped axial halves. An improved telescoping external fixation device as described in . 7. The improved method according to claim 6, wherein the fixing means comprises a screw. Telescopic external fixation device. 8. Relative axial direction along an axis coincident with the central longitudinal axis of the elongated telescoping device A pair of telescoping inner and outer parts adapted for reciprocating movement. a self-constructed elongated telescoping device; one or more spaced apart longitudinally of the clamp and extending transversely thereof; a pair of pins each carried on a telescoping component for clamping an orthopedic retention pin; lamp and A clamp connecting means provided on each of the above parts to connect each of the above clamps. Each of the clamp connecting means includes a clamp holder and a clamp connecting means for connecting the holder. means for locking in the locked or unlocked state. and the clamp holder is arranged in a first rotary position spaced apart in an outer radial direction of the outer part. The clamp holder has a shaft that allows the clamp holder to rotate when the lock is released. Regarding the above related clamp, so that it can rotate integrally around the first axis. The clamp holder is slidable in the longitudinal direction along the first axis. It is adjustable and supported so that its associated above-mentioned clamp is empty a radius measured along the first axis between the clamp and the telescopic device; It can be changed by changing the direction distance, wherein each said clamp extends in its longitudinal direction and is perpendicular to said first axis. The clamp holder can be rotated integrally around the second rotation axis of the clamp holder. An improved telescoping external fixation device characterized by being rotatably supported by Place. 9. Each said clamp connection means is slidably supported on its associated said telescopic part. a releasably secured connector to its associated telescoping component; and said securing means, when released, said associated clamp. Claims in which the connector related to the telescopic device is slidable in the longitudinal direction of the telescopic device. 9. The improved telescoping external fixation device of claim 8. 10. Each said connector is rotatably supported on its said telescoping member, and and the associated clamp connection means is aligned with the longitudinal axis of the telescoping device. rotationally adjusted around an axis to assume different angular positions relative to the telescoping device. An improved telescoping external fixation device according to claim 8 or claim 9. 11. One side is fixed to the free end of the inner telescoping part and the other is the length of the outer telescoping part. Claims wherein two said connectors are provided slidably arranged along An improved telescoping external fixation device according to clause 8, 9 or 10. 12. Each said clamp connection means connects its associated said connector to said clamp hoW. the axis of the telescoping device and the first A rotation block that is rotatable around a third axis extending at right angles to both the axis. The improvement according to any one of claims 8 to 11 consisting of telescopic external fixation device. 13. Each said connector has a pair of halves surrounding its associated telescoping part and an upper Clamping the half body around the periphery of the part, which rotates it against the telescoping device. Claims consisting of means for locking to prevent both rolling and sliding movements. An improved telescoping external fixation device according to any one of clauses 8 to 12. 14. The halves are hinged together along an axis parallel to the axis of the telescoping device. and the locking means co-aligns adjacent ends of the halves opposite the hinge axis. Claim 13 consisting of a clamp or locking screw for clamping the Improved telescoping external fixation device as described in Sec. 15. Each of the clamp holders is rotatably supported around the first axis, and A pair of semi-circular fins at the ends of the jaws extend transversely and fixedly carry the jaw members. The fins or the inner peripheral wall of the member are The clamp was rotated through 360° and then held there. Each of the above clamps is rotatably housed so that the orientation of the fixation device pin can be similarly changed. An improvement as claimed in any one of the preceding claims, forming a through opening in which telescopic external fixation device. 16. Each said pin clamp includes a plurality of longitudinally spaced apart pin clamps extending across the inner surface. a pair of separate, identically shaped axially aligned and spaced apart grooves each having a number of transverse grooves; a central circle in which the fins are in bearing contact with the inner circumferential wall of the jaw member; a single member comprising a bearing part and projecting from both sides of said bearing part and said fixing device; for forming a transversely extending through opening for accommodating the clamping retaining pin of the It is a three-piece assembly consisting of the above half plate and a pair of plate parts that cooperate with each other. and a clamp screw is provided for clamping each pair of plates together. 16. The improved telescoping external fixation device of claim 15. 17. Additionally, the inner and outer parts can be released to prevent relative axial movement. The above claim consists of a releasable locking means for operatively locking. The improved telescoping external fixation device according to any one of . 18. When released, the locking means locks the inner telescoping part against the outer part. Claim 17, further comprising a limiting means for limiting the range of axial movement of the Improved telescoping external fixation device. 19. Said limiting means are arranged on the inside of said inner part cooperating with a radial wall on said outer part. or the improved extension according to claim 18, which comprises the supporting surface at the distal end. Reduction external fixation device. 20. said releasable locking means threadably engaging an external thread at the proximal end of said outer part; It consists of a locking collar with an internal thread. A locked or fastened device that locks the parts against relative axial movement. a relaxed or released state that allows said parts to undergo relative axial movement. Any of claims 17 to 19, which is movable between the released state and the released state. The improved telescoping external fixation device according to any one of the above. 21. Furthermore, it can be attached to the end of the housing and resists movement of the inner parts. relative axial direction of the telescopic part until it resists and exceeds a set or predetermined load With the inner part above to provide adjustable axial load force to prevent movement Consists of an axial loading device consisting of a cooperating adjustable spring mechanism An improved telescoping external fixation device as claimed in any one of the preceding claims. 22. Additionally, the housing at its distal end can be used to lengthen the bone. and for effecting axial separation of the telescoping components and then dislodging the bone fragments. an adjustable rod consisting of a longitudinally extending threaded rod arranged coaxially with the above device for Claims 1 to 20 consist of an axial release device capable of The improved telescoping external fixation device according to any one of . 23. an elongated telescoping device; It is composed of a limiting means and a limiting engagement means that can cooperate, The elongated telescoping devices have mutually restricted axes along the longitudinal axis of the device. Consisting of telescopically engaged inner and outer parts arranged for directional reciprocating movement. The outer one of the above parts has a central hole extending the entire length. It constitutes a housing, and the inner part of the above parts is engaged with the above hole by sliding fit. The rods are joined together to form a rod extending over its entire length, and the rod rotates around the above-mentioned axis. The rod is made of metal and the surface of the hole is is constructed of a hard polymeric material, and the cooperable limiting means and limiting engagement means are The rod and halves are connected to limit the movement of the rod relative to the housing within predetermined limits. The rod is provided between the housings, and during the above-mentioned limited reciprocating movement, the rod is an elongate member arranged to maintain sliding contact with the hole along its length; Reduction external fixation device. 24. A rod that releasably locks the rod and accommodates the rod so that it does not move in the axial direction. 24. The improved telescoping external fixation of claim 23 comprising locking means. Device. 25. The restriction means is a restriction block carried at the end of the coaxial rod. and the limiting engagement means extends radially inside the distal end of the housing. According to either claim 23 or 24, consisting of facing walls. improved telescopic external fixation device. 26. one carried by the rod adjacent to its proximal end, and the other to its proximal end. adjustably carried on the housing for positioning over the length Consists of a pair of orthopedic pin clamp assemblies, each assembly containing one or The contract consists of a pin clamp that removably secures more pins. Improved telescopic external fixation according to any one of items 23 to 25 Device. 27. As described and illustrated above with reference to figures 1 to 6 of the accompanying drawings. or modified as shown in any one of Figures 7 to 9 of the drawings. Improved telescoping external fixation device as constructed.