EP4376756A1 - Chirurgisches instrument und lenkgetriebe dafür - Google Patents
Chirurgisches instrument und lenkgetriebe dafürInfo
- Publication number
- EP4376756A1 EP4376756A1 EP22757868.9A EP22757868A EP4376756A1 EP 4376756 A1 EP4376756 A1 EP 4376756A1 EP 22757868 A EP22757868 A EP 22757868A EP 4376756 A1 EP4376756 A1 EP 4376756A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steering
- gear
- shaft
- longitudinal axis
- wobble
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/30—Surgical robots
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/70—Manipulators specially adapted for use in surgery
- A61B34/71—Manipulators operated by drive cable mechanisms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/005—Flexible endoscopes
- A61B1/0051—Flexible endoscopes with controlled bending of insertion part
- A61B1/0052—Constructional details of control elements, e.g. handles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/005—Flexible endoscopes
- A61B1/0051—Flexible endoscopes with controlled bending of insertion part
- A61B1/0057—Constructional details of force transmission elements, e.g. control wires
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/00234—Surgical instruments, devices or methods for minimally invasive surgery
- A61B2017/00292—Surgical instruments, devices or methods for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
- A61B2017/003—Steerable
- A61B2017/00318—Steering mechanisms
- A61B2017/00323—Cables or rods
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/00234—Surgical instruments, devices or methods for minimally invasive surgery
- A61B2017/00292—Surgical instruments, devices or methods for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
- A61B2017/003—Steerable
- A61B2017/00318—Steering mechanisms
- A61B2017/00323—Cables or rods
- A61B2017/00327—Cables or rods with actuating members moving in opposite directions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B2017/00367—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
- A61B2017/00398—Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like using powered actuators, e.g. stepper motors, solenoids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B2017/2901—Details of shaft
- A61B2017/2902—Details of shaft characterized by features of the actuating rod
- A61B2017/2903—Details of shaft characterized by features of the actuating rod transferring rotary motion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B17/2909—Handles
- A61B2017/2912—Handles transmission of forces to actuating rod or piston
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B17/2909—Handles
- A61B2017/2912—Handles transmission of forces to actuating rod or piston
- A61B2017/2919—Handles transmission of forces to actuating rod or piston details of linkages or pivot points
- A61B2017/292—Handles transmission of forces to actuating rod or piston details of linkages or pivot points connection of actuating rod to handle, e.g. ball end in recess
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B17/2909—Handles
- A61B2017/2912—Handles transmission of forces to actuating rod or piston
- A61B2017/2923—Toothed members, e.g. rack and pinion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/28—Surgical forceps
- A61B17/29—Forceps for use in minimally invasive surgery
- A61B2017/2926—Details of heads or jaws
- A61B2017/2927—Details of heads or jaws the angular position of the head being adjustable with respect to the shaft
- A61B2017/2929—Details of heads or jaws the angular position of the head being adjustable with respect to the shaft with a head rotatable about the longitudinal axis of the shaft
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/30—Surgical robots
- A61B2034/301—Surgical robots for introducing or steering flexible instruments inserted into the body, e.g. catheters or endoscopes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/30—Surgical robots
- A61B2034/305—Details of wrist mechanisms at distal ends of robotic arms
Definitions
- the invention relates to a steering gear of a surgical instrument for bending a tool tip by means of a spatially alignable wobble steering ring, and to a surgical instrument that has such a steering gear.
- Surgical instruments are known from the prior art, which can be performed manually or by a robot, and which have tools whose tool tip can be pivoted by means of a plurality of interlocking pivoting members. These pivot links are connected to a variety of steering wires or cables to provide fine control of the tool tip. A more even force distribution in all bending directions can be achieved with many thin steering wires compared to a few thicker steering wires. It is known from US Pat. No.
- 5,454,827 B2 to couple such steering wires to a spatially adjustable swashplate arranged on the proximal side in an actuating unit, which is connected via a rod to a manually operable control lever, so that a movement of the spatially adjustable swashplate results in a corresponding relative movement of the distal-side Pivoting members and thus a pivoting of the tool tip gently caused.
- the setting angles of two drives can be transmitted directly to the swash plate in order to align them for controlling the tool tip.
- steering wires are attached to the swash plate so that the tool tip can be continuously and smoothly controlled by aligning the swash plate.
- the known steering gear has two drive bevel gears offset from one another by 180°, which are arranged on a common axis of rotation, which runs perpendicularly to a longitudinal axis of the instrument, each with an associated motor.
- the swash plate is arranged between the drive bevel gears and is mounted in a steering ring which is non-rotatably connected to a third bevel gear which meshes with the two drive bevel gears and can be rotated about an axis of rotation which is perpendicular to the longitudinal axis of the instrument and perpendicular to the common axis of rotation of the pinion gears runs.
- the toothed chain is supplemented by a fourth bevel gear, which is arranged on the axis of rotation of the third bevel gear offset by 180° to the third bevel gear and meshes with the two drive bevel gears, where the steering ring is freely rotatably mounted in the fourth bevel gear.
- the toothed chain closed in this way ensures that all the bevel gears engage with one another and enables an even distribution of power.
- the design of the drive for the steering wires with the spatially adjustable swash plate on which the steering wires are mounted has the advantage that this enables a spatially com pact design and only one component has to be moved in order to be able to address all steering wires.
- US Pat. No. 7,699,855 B2 discloses a surgical instrument which has an interface in order to be able to connect the instrument to a robotic arm. All drives that control the instrument are arranged in the robotic arm. The transfer the angle of rotation of the drives to the instrument takes place via coupling discs in a common separating plane.
- WO 2014/004242 also describes such an interface, with the drives being installed in the robot arm.
- the above construction is associated with a complex structure and an indi rect control.
- the drives are not arranged directly in the surgical instrument, which means that the swash plate is not controlled in a linear manner.
- US Pat. No. 10,105,128 B2 also discloses a control of such a tool tip; there this is done via a mechanism that includes toothed disc segments and link rods in order to transmit the movement of the drives to the swash plate.
- the additional task of providing a surgical instrument with an alternative guide for the steering ring is achieved by the surgical instrument having the features of independent claim 11 .
- the steering gear according to the invention is designed for handling a surgical instrument that has a shaft at the distal end of which there is a bending mechanism for actuating a tool.
- the steering gear according to the invention can be arranged at the proximal end of the shaft, which has a longitudinal axis B, who the.
- the steering gear according to the invention has a shaft element which also has a longitudinal axis and which, in a mounting arrangement in which the steering gear and the surgical instrument are mounted on one another, continues the shaft; accordingly, the two longitudinal axes continue each other.
- the steering gear has a wobble steering ring which is operatively coupled to the distal bending mechanism to control the bending of the same. can become pelted.
- the wobble steering ring has a central-axial through-opening for a bearing device which is fixed in the axial longitudinal direction on the shaft element of the steering gear and can be rotated about the longitudinal axis B with the shaft element.
- the steering gear has three motorized drives and provides an operative coupling of the three drives with the wobble steering ring for the transmission of the adjustment angles of the three drives to the wobble steering ring.
- the wobble steering ring can be aligned spatially with respect to two pivot axes running perpendicular to one another and to the longitudinal axis via the adjustment angle of two of the three drives and can be rotated about the longitudinal axis via the adjustment angle of the third of the three drives.
- the longitudinal axis of the shaft shaft is identical to the longitudinal axis of the shaft of the surgical instrument into which the steering gear according to the invention can be used.
- the shaft element which can be arranged at the proximal end of the shaft of the surgical instrument and can continue this shaft, enables the shortest possible axial space and thus a space-saving, compact steering gear.
- the wobble steering ring can be controlled directly by means of the drive motors. No further deflection mechanisms or gear ratios are necessary, so that the shortest possible transmission chain is possible.
- Such a direct power transmission which shows a linear transmission behavior, allows a simple software control, so that a precise and reliable control of the component to be controlled is achieved.
- the bearing device of the wobble steering ring which can be rotated about the longitudinal axis with the shaft element, is a cardanic bearing device which has a universal joint disk arranged in the central-axial through-opening and having at least four radial through-holes offset by 90° to one another, wherein a bearing pin is arranged in each radial through bore.
- the other two in the through-holes coaxially, ie offset by 180 ° to each other arranged second bearing pins, which form a second pair of bearing pins, connect the universal joint disk with the Shaft element, wherein the first pair of bearing pins is offset by 90° to the second pair of bearing pins.
- the universal joint disk is pivotably arranged on the shaft element by means of the bearing pin pairs and supports the wobble steering ring so that it can be tilted about the pivot axes and rotated about the longitudinal axis B with the shaft element.
- the wobble steering ring is thus fixed laterally in space on the shaft element, which is rotatably mounted at both ends, but can be tilted or rotated in all three spatial directions, as a result of which the tool tip can be controlled in a targeted manner.
- Spherical disc-shaped means here a toroidal, part-spherical or also toroidal outer surface, which is defined by a surface of revolution, which is formed by rotation of an outwardly curved arc of a circle about the longitudinal axis, the center of the circular arc lying on the longitudinal axis and thus any contact point is ideally equidistant to the center of the circle.
- Effective section is the area of the steering ring that can enter into a force-transmitting operative connection with the contact roller section, i.e. is in direct contact with the force transmitter, e.g. through a frictional operative connection using friction elements, or is in engagement, e.g. through a Gearing or other suitable power-transmitting active connections.
- the power transmission can take place via a mutual, interlocking toothing as an operative connection instead of via frictional engagement.
- Contact roller section here means any component that transmits the movement initiated by motors, whether rotary or linear, directly, ie can pass it on to the active section of the steering ring in the sense of a power transmission.
- the power transmission can take place via an intermeshing tooth system or another suitable operative connection instead of via frictional engagement
- the steering gear can also have four gear shafts, which are each offset by 90° around the wobble steering ring and are all rotationally driven in the same direction by the third motor.
- all gear shafts would have to rotate in the same direction for the rotation of the wobble steering ring, and gear shafts arranged in pairs or opposite each other would have to rotate in opposite directions for tilting. This allows a more stable movement of the gear and thus the control of the wobble steering ring, since twice as many contact roller sections with higher traction can apply a higher contact pressure and thus more force to the wobble steering ring.
- each gear shaft has a drive section which has a circumferentially round-toothed toothed rack section which defines an axial displacement path of each gear shaft and meshes with a pinion (drive pinion) which sits on a drive shaft of the respective motor, wherein the drive shafts define drive axes that are perpendicular to the longitudinal axis and the axes of rotation of the transmission shafts.
- a movement of a gear shaft initiated by the activation of one of the first two motors causes the drive pinion to engage in the straight teeth of the drive section, as a result of which the gear shaft is linearly displaced within the steering gear, depending on the direction in which the drive shaft rotates the pinion, e.g. B.
- Drive section means every component that directly absorbs the movement initiated by motors, whether rotary or linear, and converts it into a movement of the transmission shafts.
- the two transmission shafts are driven in the same direction by the third motor for rotation about the respective axis of rotation.
- Each transmission shaft preferably has a gear at a free end of the drive section which meshes with a common drive gear which is driven by the third motor via a drive shaft parallel to the longitudinal axis and the axes of rotation.
- the transmission shafts are therefore jointly driven by the third motor, allowing the swash steering ring to rotate.
- the gear bewelle enable by synchronizing contact roller sections the rotation of the wobble steering ring and form, if the contact roller sections are designed as rollers, a kind of roller mill, the drum of which corresponds to the wobble steering ring.
- a force transmission between the contact roller sections of the gear shafts and the active section of the wobble steering ring is provided by frictional engagement.
- One or both of the friction partners consisting of the active section of the wobble steering ring and the respective contact roller section, have a casing made of a friction-increasing material. Alternatively, they consist entirely of the friction-increasing material.
- the wobble steering ring can have such a material or only the contact roller sections or both components.
- the frictional connection enables a constructively simple power transmission through a suitably selected material that applies a specific frictional force.
- these contact roller sections can be casings, for example stretched hose sections made of an elastomer, such as rubber.
- the steering gear has a bearing housing with a base plate, the transmission shafts below the two Ge and is arranged parallel to them.
- the bearing housing has a first side plate which is fixed to the base plate at the end of the contact portions of the gear shafts and has two through-holes for supporting the gear shafts.
- the bearing housing has a second side plate with two through-holes, through which the drive portion located between the toothed portions and the terminal gears extends and which is fixed to the base plate at the end facing away from the first side plate.
- the length of the section of the transmission shaft between the toothed section and the terminal gear wheel corresponds at least to the length of the displacement path of the transmission shaft, so that neither the gear wheel nor the toothed section strike the second side plate during the axial movement of the transmission shaft.
- the bearing housing enables safe storage of the moving components of the steering gear.
- the shaft element is also rotatably mounted in these two components by means of two ball bearings.
- the wobble steering ring has a first end face which has a first funnel-shaped recess.
- a base of the first funnel-shaped recess there are through-holes for the passage of steering wires.
- the steering wires are preferably mounted in a clamped manner on the wobble steering ring by means of a clamp connection, so that in the event of damage, the steering wires can be easily replaced.
- This clamping connection can be provided, for example, by a clamping disk that can be arranged in the second funnel-shaped recess.
- the steering wires can also be glued, welded or soldered to the wobble steering ring in order to achieve a stable fastening of the steering wires. Because the steering wires can be connected directly to the swash steering ring, no further additional components are necessary, such as a separate arrangement of the swash plate in a steering ring, as has been the case in the prior art.
- the central-axial passage opening of the wobble steering ring extends through the funnel base of the first funnel-shaped recess.
- the swash control ring has a second end face which has a second funnel-shaped recess.
- the second funnel-shaped recess has a smaller diameter than the first funnel-shaped recess.
- the central-axial through-opening extends further through the funnel base of the second funnel-shaped recess, so that there is a continuous linear through-opening around the geometric center of the wobble steering ring through this, in which the cardanic bearing device for mounting the wobble steering ring on the Shaft element can be used.
- the funnel-shaped recesses allow the swash ring to be flexible in space be tilted without disturbing the course of the steering wires, these can easily follow the movement of the wobble steering ring.
- a first embodiment of a surgical instrument according to the invention which has a shank, an actuating unit arranged at the proximal end of the shank and a tool arranged at the distal end of the shank with a tool tip that can be bent by means of a distal deflection mechanism, refers to the fact that the tool tip that can be bent by a steering gear according to the invention can be spatially aligned.
- the steering gear according to the invention allows the surgical instrument to be constructed in a structurally simple and space-saving manner, so that a simple connection to a robot arm can be made possible, in which the movement of the drives can be transmitted directly to the tool tip.
- the result is an exactly controllable use of the surgical instrument.
- the actuating element is mounted in the shaft in an axially displaceable manner and is operatively connected to the actuating unit on the proximal side.
- the distal deflection mechanism of the deflectable tool tip consists of at the distal end of the shank is arranged swivel members, the wires running in the longitudinal direction of the shank steering are connected to the steering gear.
- the surgical instrument according to the invention has the advantage that many thin steering wires can be used to control the pivotable tool tip and that this control is sensitive, precise and reproducible due to the motorized drive for the spatially adjustable disc on which the steering wires are mounted proximally he follows. Further embodiments as well as some of the advantages associated with these and other embodiments of the steering gear and the surgical instrument will become clearer and better understood through the following detailed description with reference to the accompanying figures. Items or parts thereof that are substantially the same or similar may be given the same reference numbers.
- the figures are only a schematic representation of an embodiment of the invention.
- the drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into further meaningful combinations.
- FIG. 1 shows a schematic perspective side view of a surgical instrument
- FIG. 2 shows a perspective view of a steering gear according to the invention with a wobble steering ring
- FIG. 3 shows another perspective, partially sectioned view of a steering gear according to the invention with a wobble steering ring
- FIG. 6 is a front view of the steering gear according to the invention.
- Fig. 7 is a front view of the wobble steering ring with the force transmitters of the gears.
- Fig. 1 shows schematically a surgical instrument 1 with a hollow shank 2, arranged at the proximal end 3 of the shank 2, shown only schematically Actuate supply unit 4 and arranged at the distal end 5 of the shank 2 tool tip 6 with a tool 7, which is about an axially displaceable actuating element 8 mounted in the shaft 2 can be actuated, which is in operative connection with the actuating unit 4 on the proximal side. bond stands.
- the actuating unit 4 can be a manually actuated handle or a structural unit designed for robotic use, that is to say it can also be actuated without manual intervention.
- the tool 7 of the tool tip 6 can be, for example, a tool provided with jaw parts, as shown in FIG.
- the tool tip 6 can be pivoted relative to the longitudinal axis 10 of the shank 2 via a joint mechanism 9, the joint mechanism 9 consisting of pivoting members 11 arranged at the distal end of the shank 5, which are connected via steering wires 12 running in the longitudinal direction of the shank 2 to a proximal En de 3 of the shaft 2 arranged drive in the form of a steering gear 13 are connected that a movement of the proximal side drive 13 causes a corresponding relative movement of the distal-side pivoting members 11 and thus a pivoting of the tool tip 6.
- steering wires 12 can also be used functionally, which is why the term steering wires 12 used can also be read and understood synonymously as a steering cable.
- the axially ver slidably mounted in the shaft 2 actuating element 8 for actuating the tool tip 6 of the tool 7 is formed in the illustrated embodiments as a pull / push rod.
- the steering gear 13 for the steering wires 12 is a motorized steering gear 13, which has a spatially adjustable wobble steering ring 14, on which the steering wires 12 are mounted in such a way that a displacement of the wobble steering ring 14, preferably via the motorized steering gear 13, is effected via the steering wires 12 causes a pivoting of the tool tip 6.
- the shank 2 is connected to the motorized steering gear 13 connected.
- the actuating element 8 for actuating the instrument 7 is axially slidably mounted ver.
- the steering wires 12 emerging from the shaft 2 at the proximal end 3 of the shaft 2 are fed to a wobble steering ring 14 mounted on the shaft element 21 and set there.
- the swash -Lenkring 14 for each steering wire 12 an axialpa parallel through hole 30, wherein the steering wires 12 within the through holes 30 are fixed.
- the steering gear 13 is shown in detail in an embodiment of the invention, the core of the spatially adjustable swash -Lenkring 14 is on which the steering wires 12 are attached so that a displacement of the swash-steering rings 14 over the steering wires 12 mounted on the wobble steering ring 14 causes the tool tip 6 to pivot.
- the steering wires 12 for pivoting the distal-side pivoting members 11 and the tool tip 6 can be controlled precisely, sensitively in the smallest of steps and also reproducibly by means of the construction via the wobble steering ring 14 .
- the number of steering wires 12 to be used for a motorized drive 13 can be chosen quite freely, in the example shown, e.g. B. Fig. 6, the wobble steering ring 14 provides ten through holes 30 for the steering wires 12 before.
- the steering gear 13 has, as can be seen in Fig. 2 and 3, three drives with motors 17, 17 ', 17' with drive axles C, C', C', the drive axles C, C of the first motor 17 and of the second motor 17' are parallel to each other and at right angles to the longitudinal axis B.
- the drive axis C" of the third motor 17" runs parallel to the longitudinal axis B.
- the longitudinal axis B is the common axis in the longitudinal direction of the surgical instrument 1 according to FIG. 1 and of the steering gear 13.
- the shaft 2 of the surgical instrument lies on the longitudinal axis B therein 1 and also a shaft element 21 adjoining the shaft 2, on which the wobble steering ring 14 is arranged.
- the first two motors 17, 17' each have a drive shaft 17a, 17b, on each of which a pinion 19, 19' is seated.
- the pinions 19, 19' are each connected to a gear shaft 15, 15', each gear shaft 15, 15' having a contact roller section K and a drive section A on.
- the gear shafts 15, 15' each have an axis of rotation D, D' which is parallel to the longitudinal axis B and forms a central angle of 90° with the longitudinal axis B, as shown in FIG.
- each transmission shaft 15, 15' has a circumferentially round toothed rack section 18, 18', with which each pinion 19, 19' meshes.
- the gearing is straight so that when one or both of the motors 17, 17' rotate their drive shafts 17a, 17b rotate, the pinions 19, 19 'rotate as well, due to the constant engagement in the respective rack sections 18, 18' of the gear shafts 15, 15 'the gear shafts 15, 15' are linearly displaced in the distal or proximal direction, depending on the direction of rotation direction of the drive shafts 17a, 17b.
- the toothed rack section 18, 18' has a length which corresponds to an axial displacement path of the transmission shaft 15, 15'.
- the respective contact roller section K of the gear shafts 15, 15' sits in a distal area of the gear shafts 15, 15' and makes tangential contact with a lateral surface of the wobble steering ring 14 at a contact point E, E' on an active surface W, as shown in particular in Fig. 7 can be seen.
- the effective surface W corresponds to the complete lateral surface of the swash steering ring 14.
- the geometric shape of the swash steering ring 14 is a symmetrical spherical disk, the geometric center of which lies on the longitudinal axis B.
- the center forms an isosceles triangle whose legs are each defined by a straight line perpendicular to the longitudinal axis B and to the respective axis of rotation D, D 'through the center of the Ku gel disc and the contact point E, E 'on the effective surface W of the swash -Lenkrings 14 and each have a gimbal pivot axis F, F' defined, which enclose a right angle at the center ei NEN.
- the wobble steering ring 14 can be tilted in all three spatial directions about these pivot axes F, F'.
- force transmitters 16, 16' are provided in the contact roller section K, which, as a circumferential rubber coating, accomplish the force transmission via frictional engagement.
- a material with a high coefficient of friction increases traction and thus the force that can be transmitted to the active surface W, both for tilting and for rotation.
- each transmission shaft 15, 15' has a gear wheel 25, 25' at its free, proximal end of the drive section A, which meshes with a common drive gear wheel 23.
- the common drive toothed wheel 23 is driven by the third motor 17′′ via a drive shaft 23′ parallel to the longitudinal axis B and the axes of rotation D, D′, which defines the third drive axis C′′ (see FIG. 5).
- An axial length of the drive gear 23 is adapted to the axial displacement path of each gear shaft 15, 15', so that the gears 25, 25' remain in mesh with the common drive gear 23 during the linear back and forth movement of the gear shafts 15, 15' .
- the gears 25, 25' are connected to the transmission shafts 15, 15' via suitable fastening means, here, as can be seen in FIG. so that a slip-free rotation of the gear shafts 15, 15' is possible.
- the wobble steering ring 14 which is in the form of a symmetrical spherical disc, has two end faces, as can be seen in FIGS. 2 to 6 and in particular in FIG.
- a first end face 28 is oriented in the distal direction and has a first funnel-shaped recess 28'.
- the through-holes are 30 for carrying out the steering wires 12 (shown in Fig. 3, 5 to 8) is introduced, as well as a central-axial through-opening 14' of the swash -Lenkrings 14, the extends from the first end face 28 to a second end face 29 also through its funnel, so that the wobble steering ring 14 can be mounted on the shaft element 21.
- the second end face 29 of the wobble steering ring 14 has a second funnel-shaped recess 29'. This second funnel-shaped recess 29' has a smaller diameter than the first funnel-shaped recess 28' and allows tilting on the shaft element 21.
- a bearing pin 33 is also arranged in each of the two other radial through-bores of the universal joint disk 10, which are offset by 90° thereto, one of which can be seen in FIG aligned with the corresponding through hole in the universal joint disk 10.
- two bearing pins 33, 34 arranged offset from one another by 180° form a first and a second pair of bearing pins, with the first pair of bearing pins, from which in 3 a first bearing pin 33 is arranged in the radial through hole 31 of the swash steering ring 14 and in FIG.
- the two other bearing pins 34 which are offset by 180° from one another, i.e.
- the universal joint disk 10 is thus pivotably arranged on the shaft element 21 by means of the second bearing pins 34 and supports the wobble steering ring 14 via the bearing pins 33 so that it can be tilted about the pivot axes F, F′. This also transfers the power through the steering gear
- a bearing housing 20 which has a base plate 22 which is arranged below the two transmission shafts 15,15' and parallel to these, as shown in FIGS. 2, 3 and 4.
- the base plate 22 is adjoined by a first side plate 24, which is at the end of the contact sections K, K' of the gear shafts 15, 15' and two through-holes 26 (see FIG. 6) for the rotatable positioning of the gear shafts 15 has '15'.
- roller bearings for example ball bearings, optionally also plain bearings, which are incorporated in the through-holes 26, are preferably provided.
- the bearing housing 20 has a second side plate 24' with two through-bores 27, through which the drive section A extends between the toothed sections 18, 18' and the terminal gear wheels 25, 25'.
- the second side plate 24 ′ is fastened to the base plate 22 at the end of the base plate 22 which is remote from the first side plate 24 .
- the second side plate 24' has a through hole 26' for mounting the drive shaft 23' of the drive gear wheel 23, as can be seen in FIG.
- the mounting of the shaft element 21 on both sides is also shown there:
- the second side plate 24' has a further through hole 27' with a bearing ring 38.
- the housing 20 has a third side plate 24" with a through hole 27" in which a roller bearing 35 is also arranged.
- the second side plate 24' carries fastening means 37 with which the third motor 17'' is fastened to the bearing housing 20.
- the length of the fastening means 37 corresponds at least to the length of the gear wheel 23, so that the fastening means 37 keep the displacement movement of the transmission shafts 15, 15' stable.
- All three motors 17, 17', 17'' can be connected to a power source (external or present in the surgical instrument 1) via electrical connections 36.
- the present invention provides a steering gear 13 for a surgical instrument 1 with a shaft 2, at the distal end 5 of which there is a bending mechanism 9 for actuating a tool 6, and a surgical instrument 1 with such a steering gear is ready.
- the steering gear 13 has a shaft element 21 with a longitudinal axis B, which continues the shaft 2 when the steering gear 13 is assembled with the surgical instrument 1 .
- wobble steering ring 14 which can be operatively coupled to the distal bending mechanism 9 and has a central-axial through opening 14' for a bearing device which is fixed in the axial longitudinal direction on the shaft element 21 of the steering gear 13 and which is connected to the shaft element 21 the longitudinal axis B is rotatable.
Landscapes
- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Robotics (AREA)
- Ophthalmology & Optometry (AREA)
- Transmission Devices (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021119533.0A DE102021119533B4 (de) | 2021-07-28 | 2021-07-28 | Chirurgisches Instrument und Lenkgetriebe dafür |
| PCT/EP2022/070836 WO2023006685A1 (de) | 2021-07-28 | 2022-07-25 | Chirurgisches instrument und lenkgetriebe dafür |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4376756A1 true EP4376756A1 (de) | 2024-06-05 |
Family
ID=83005869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22757868.9A Pending EP4376756A1 (de) | 2021-07-28 | 2022-07-25 | Chirurgisches instrument und lenkgetriebe dafür |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20240350159A1 (de) |
| EP (1) | EP4376756A1 (de) |
| DE (1) | DE102021119533B4 (de) |
| WO (1) | WO2023006685A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021119522B4 (de) * | 2021-07-28 | 2023-10-12 | Karl Storz Se & Co. Kg | Chirurgisches Instrument und Lenkgetriebe dafür |
| DE102022134210A1 (de) * | 2022-12-20 | 2024-06-20 | Karl Storz Se & Co. Kg | Lenkgetriebe für ein chirurgisches Instrument und damit ausgestattetes chirurgisches Instrument |
| DE102023103174A1 (de) | 2023-02-09 | 2024-08-14 | Karl Storz Se & Co. Kg | Taumelscheiben-Lagerungsanordnung und damit ausgestattetes chirurgisches Instrument |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5454827A (en) | 1994-05-24 | 1995-10-03 | Aust; Gilbert M. | Surgical instrument |
| US7699855B2 (en) | 1996-12-12 | 2010-04-20 | Intuitive Surgical Operations, Inc. | Sterile surgical adaptor |
| US6817974B2 (en) | 2001-06-29 | 2004-11-16 | Intuitive Surgical, Inc. | Surgical tool having positively positionable tendon-actuated multi-disk wrist joint |
| US9101735B2 (en) * | 2008-07-07 | 2015-08-11 | Intuitive Surgical Operations, Inc. | Catheter control systems |
| US9119657B2 (en) | 2012-06-28 | 2015-09-01 | Ethicon Endo-Surgery, Inc. | Rotary actuatable closure arrangement for surgical end effector |
| CN103085083B (zh) * | 2013-01-07 | 2015-06-24 | 汪雯 | 可弯转可伸缩的柔性连续体机械结构 |
| US10259129B2 (en) * | 2014-05-06 | 2019-04-16 | The Johns Hopkins University | Adjustable stiffness morphable manipulator |
| DE102019201785B4 (de) | 2019-02-12 | 2026-05-07 | Festo Se & Co. Kg | Gelenkanordnung |
| US12582300B2 (en) * | 2019-04-08 | 2026-03-24 | Fortimedix Assets Ii B.V. | Steerable instrument comprising a detachable part |
| DE102019121092A1 (de) * | 2019-08-05 | 2021-02-11 | Karl Storz Se & Co. Kg | Medizinisches instrument |
-
2021
- 2021-07-28 DE DE102021119533.0A patent/DE102021119533B4/de active Active
-
2022
- 2022-07-25 EP EP22757868.9A patent/EP4376756A1/de active Pending
- 2022-07-25 US US18/291,415 patent/US20240350159A1/en active Pending
- 2022-07-25 WO PCT/EP2022/070836 patent/WO2023006685A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023006685A1 (de) | 2023-02-02 |
| US20240350159A1 (en) | 2024-10-24 |
| DE102021119533A1 (de) | 2023-02-02 |
| DE102021119533B4 (de) | 2023-08-24 |
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