JPH07303662A - Connecting device for medical treatment - Google Patents

Abstract

PURPOSE:To provide a connecting device for medical treatment for firmly fastening teeth etc., easy to apply, long to wear. CONSTITUTION:The connecting device for medical treatment has two pairs of legs 14, 14, and 16, 16 extended from the central portion 12, toward the opposite direction on both ends, and is made of a specified form memorizing alloy materials, which give to each pair of legs 14, 14 and 16, 16 memories of opening and closing shapes. And, there are bulges 18, 20 swelling toward opening/closing direction, situated at both external sides 14b, 14b and 16b, 16b (or, at both internal sides 14a, 14a and 16a, 16a), which exist in the front side in a opening/closing direction definited by form memorizing function by each pair of legs 14, 14 and 16, 16.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a medical connecting fixture that is used for connecting and fixing teeth and bones and exerts a fastening force.

[0002]

[Background Art] When treating, correcting, or joining teeth and bones, it may be necessary to connect and fix the teeth and bones together. For this reason, conventionally, various types of connecting and fixing teeth have been conventionally used. Wires, bridges, and the like have been developed, and bolts and fasteners using metal plates or ceramics have been developed for connecting and fixing bones.

However, the connecting wire has a problem that it is difficult to obtain a sufficient fastening force and durability, and the bridge and the bolted connecting tool have a problem that the work for mounting is difficult and troublesome and time consuming.

Therefore, in view of such problems, in recent years, a shape memory alloy having a characteristic of being restored to an original shape stored in advance by being heated to a constant temperature has been used as a kind of tooth connecting fixture. Things have been proposed. As shown in FIG. 13, such a connecting fixture has an elongated rectangular plate shape as a whole and is provided with cut grooves 2 extending at predetermined lengths at both ends in the longitudinal direction. A pair of leg portions 4 and 4 are formed on both sides of the cut groove 2 and spread to both sides as shown by imaginary lines in the figure for each pair of leg portions 4 and 4. The shape is stored.

Then, such a connecting fixture is inserted into a preformed recess straddling between the members to be connected,
By heating, each pair of legs 4 and 4 is opened and locked to each connected body, whereby a connecting force is exerted between these connected bodies.

However, even with the connecting fixture using such a shape memory alloy, it is still difficult to exert a sufficient fastening force on the object to be connected such as teeth, and there is room for improvement.

[0007]

The present invention has been made in view of the circumstances as described above, and has been improved in that a larger fastening force can be exerted on a connected body such as a tooth or a bone. Another object is to provide a connecting fixture having a different structure.

[0008]

In order to solve such a problem, a feature of the present invention resides in that a medical connecting and fixing device is mounted between connected bodies of teeth and bones to connect and fix the connected bodies to each other. A tool having a pair of legs extending from the central portion to both sides in opposite directions, formed of a predetermined shape memory alloy material, and storing a shape in which the legs forming each pair open or close. In addition, in each of the paired legs, there is a medical connecting fixture having bulges protruding in the opening / closing direction on both outer surfaces or both inner surfaces located on the front side in the opening / closing direction by the shape memory action. .

In the medical connecting fixture as described above, the specific shape of the bulge portion formed on the leg portion is not particularly limited. For example, an elliptic shape or a semi-circular shape having a curved outer peripheral edge portion. Various shapes such as a circular shape and a triangular shape having an outer peripheral edge portion formed of a linear inclined surface can be adopted. Further, the bulge portion may be formed at least on the side surface portion on the front side in the movement direction of each leg portion that is opened and closed by the shape memory effect.

Furthermore, the present invention is a medical connecting fixture that is mounted between connected bodies of teeth and bones to connect and fix the connected bodies to each other, and extends from the central portion to both sides in the opposite direction. Each pair of legs has a pair of legs and is formed of a predetermined shape memory alloy material, and the shape of each pair of legs that opens or closes is stored. A medical connecting fixture having a locking projection that projects in a direction substantially orthogonal to the opening / closing direction by the memory effect is also a feature.

Further, in such a medical connecting and fixing device, in order to obtain a locking force with respect to the object to be connected, a hooking portion having a shape such as an umbrella shape or a mushroom shape is provided at the tip of the locking protrusion. It is also possible to provide.

In a preferred embodiment of the present invention,
Regardless of whether the leg has a bulge or a locking protrusion, the base end of the notch between each pair of legs has a substantially circular hole with the leg closed. Is formed with an arc-shaped surface that becomes

Further, in another preferred embodiment of the present invention, whether the leg portion has a bulge portion or a locking protrusion, the whole including the central portion and each of the pair of leg portions. Is formed by a plate-shaped body having a substantially constant thickness.

[0014]

EXAMPLES Examples of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, FIGS. 1 and 2 show a medical connecting and fixing device 10 as one embodiment of the present invention. The connecting fixture 10 is formed of a plate body having a substantially constant thickness as a whole, and each pair of leg portions 14, 14 and 1
Reference numerals 6 and 16 extend from a plate-shaped central portion 12 of a predetermined size toward both sides sandwiching the central portion 12 in one direction, and are integrally formed. In addition,
In this embodiment, the leg portions 14, 14 forming one pair are shorter than the leg portions 16, 16 forming the other pair.

Also, each pair of legs 14, 14 and 1
6, 16 are both inner side surfaces 14a, 14a and 16a, 1
6a has a linearly extending shape, while both outer side surfaces 14b, 14b and 16b, 16b have an arcuate curved shape that bulges outward. That is, in this embodiment, the leg portions 14, 14 and 16, 16 project in the opening direction with respect to the outer side surfaces 14b, 14b and 16b, 16b of the leg portions 14, 14 and 16, 16 forming each pair. The bulging portions 18, 18 and 20, 20 having a circular or elliptical curved outer peripheral edge portion are integrally formed.

Further, the base end portions of the notches located between the pair of leg portions 14 and 14 and between the leg portions 16 and 16,
In other words, both inner side surfaces 14a of the legs 14,14,
14a of the connecting side end to the central portion 12 and the leg portion 1
Central part 1 of both inner side surfaces 16a, 16a in 6, 16
Base end holes 22 and 24 each having an arcuate inner peripheral surface are provided at the end portions on the connection side with respect to 2.

Here, the connecting fixture 10 is
It is made of shape memory alloy. As is well known, shape memory alloys can be stored at a low temperature (a temperature lower than the martensite transformation end temperature) by storing a predetermined shape at a high temperature (a temperature sufficiently higher than the martensite transformation start temperature). Even if it is deformed, it has a function of recovering to the memorized shape by raising the temperature, and various conventionally known alloy compositions can be adopted, but in particular,
In consideration of compatibility with human tissue, Ni-Ti alloy and C
A u-Zn-Al alloy or the like is preferably adopted.

Further, in this embodiment, as shown in FIG. 1, the pair of leg portions 14, 14 and 16, 16 extended and formed on both sides of the central portion 12 are opened. The shape is remembered. In addition, the leg portions 14 and 1
The leg opening angles of 4 and 16, 16 should be considered in consideration of the fastening force required for the connecting fixture 10, the material, shape, and size of the body to be connected, and the length and shape of the legs 14, 14 and 16, 16. However, in the present embodiment, α = approximately 50 ° is set.

Further, as shown in FIG. 3, the connecting fixture 10 in which the shape as described above is memorized is deformed at a low temperature, so that each pair of legs 14, 14 and 1 is formed.
Reference numerals 6 and 16 each have a closed-leg shape, and are kept in a closed-leg state under a low temperature condition so that they can be used in that condition. Under the closed leg state, the inner side surfaces 14a, 14a and 16a, 16a of the leg portions 14, 14 and 16, 16 forming each pair are brought into contact with each other and the inner side surfaces 1
The base end holes 22 and 24 provided in the base end portions of 4a, 14a and 16a, 16a are made to be substantially circular holes, respectively.

When the teeth are connected and fixed by using the connecting fixture 10 having such a structure, as shown in FIG. 4, first, the teeth 26, 28 to be connected as the objects to be connected.
On the other hand, the mounting holes 30 and 32 of the connecting fixture 10 are formed. The mounting holes 30 and 32 have an inner peripheral surface shape corresponding to the shape of the bulge portions 18, 18 and 20, 20 formed on the leg portions 14, 14 and 16, 16 forming each pair of the connecting fixture. However, in order to obtain an effective fastening force, the legs 14, 14 and 16, 16 forming each pair do not reach the shape-memorized open leg angle: α: α ′ (α ′ <
By opening only α), the bulge 18,
18 and 20, 20 outer surfaces 14b, 14b and 1
It is desirable to form the mounting holes 30 and 32 with an inner peripheral surface shape with which 6b and 16b can abut and fit.

Thereafter, the connecting fixture 10 kept at a predetermined low temperature and kept in the closed leg state shown in FIG.
It is inserted so as to straddle the mounting holes 30 and 32 formed in 6, 28, and the connecting fixture 10 is heated to a temperature higher than the reverse transformation end temperature by body temperature or by heat conduction from the outside or electric heating. Raise to temperature.

As a result, the leg portions 14, 14 and 16, 16 forming each pair of the connecting fixture 10 are respectively deformed in the leg opening direction by the shape memory effect, and the leg portions 14, 14 and 16, respectively. 16 outer side surfaces 14b, 14b
And 16b, 16b are brought into contact with and fitted to the inner peripheral surfaces of the mounting holes 30, 32 formed in the teeth 26, 28.
Further, after mounting the connecting fixture 10 on the teeth 26, 28, the mounting holes 30, 32 are further filled with resin, metal, or the like, if necessary.

The connecting fixture 10 thus mounted.
Is based on the restoring force to the original shape by the shape memory effect,
By engaging the mounting holes 30 and 32 of the teeth 26 and 28, a fastening force can be exerted between the teeth 26 and 28. There, the mounting hole 3 for the connecting fixture 10
The outer side surfaces 14b, 14b and 16b, 16b, which are contact surfaces with respect to 0, 32, have bulged portions 18, 18 and 20,
Since the outer surface 14b, 14b and 16b, 16b is formed into an arcuate surface by 20, the opening angle of each leg portion 14, 14 and 16, 16 is α ′.
Being substantially larger than that, the component force of the abutting force of each leg 14, 14 and 16, 16 against the mounting hole 30, 32 is advantageously exerted in the fastening direction of the two teeth 26, 28. Therefore, the restoring force of the connecting fixture 10 causes the tooth 2
It can be efficiently used as the fastening force of 6, 28, and a large fastening force can be easily obtained.

Moreover, in the connecting fixture 10 of the present embodiment, the stress generated by the deformation due to the shape memory effect is caused at the base end portions of the leg portions 14, 14 and 16, 16 forming each pair. The concentration is absorbed and alleviated by the base end holes 22 and 24, and therefore, the target fastening force can be stably obtained with good durability.

Further, since the connecting fixture 10 of this embodiment has a plate-like structure having a predetermined thickness as a whole, it has an advantage that it can be easily manufactured by punching or the like. Have

Next, FIGS. 5 and 6 show a connecting fixture 36 as another embodiment of the present invention. In addition,
In the present embodiment, the same reference numerals as those in the first embodiment are used in the drawings for the parts having the same structures as those in the first embodiment, and detailed description thereof will be omitted.

In the connecting fixture 36 of this embodiment, as shown by the phantom lines in FIG. 5, the leg portions 1 forming each pair.
4, 14 and 16, 16 are stored in a closed form and are deformed at a low temperature, so that each pair of legs 14, 14 forms a pair as shown by a solid line in FIG.
And 16 and 16 each have an open-legged shape, and are kept open when the temperature is low.

Also, each pair of legs 14, 14 and 1
Contrary to the first embodiment, 6 and 16 have a shape in which both outer side surfaces 14b, 14b and 16b, 16b extend linearly, while both inner side surfaces 14a, 14a and 16a, 16a. Has an arcuate curved shape that bulges inward. That is, in this embodiment, both inner side surfaces 14 of the pair of legs 14, 14 and 16, 16 are formed.
a, 14a and 16a, 16a, the leg portion 14,
The bulge portions 38, 38 and 40, 40 projecting in the closing direction of 14 and 16, 16 are integrally formed.

Then, the connecting fixture 10 having such a configuration
In order to connect and fix the teeth by using the teeth, as shown in FIG. 6, in the mounting holes 30 and 32 formed in the teeth 26 and 28 to be connected, the temperature is kept low and the legs are opened. After inserting the connecting fixture 10 held by the
0 is raised to a temperature higher than the reverse transformation end temperature.

As a result, the leg portions 14, 14 and 16, 16 forming each pair of the connecting fixture 10 are respectively deformed in the closing leg direction by the shape memory effect, and the leg portions 14, 14 and 16, respectively. 16 inner side surfaces 14a, 1
The fastening force is exerted between the teeth 26, 28 by contacting and fitting the inner peripheral surfaces of the mounting holes 30, 32 formed in the teeth 26, 28 with 4a and 16a, 16a.

At this point, the connecting fixture 36 of this embodiment is used.
Even if there is, like the connecting fixture 10 of the first embodiment,
Inner side surfaces 14a, 14 that are contact surfaces with the mounting holes 30, 32
Since a and 16a, 16a are arcuate surfaces due to the bulging portions 38, 38 and 40, 40,
When the legs 14, 14 and 16, 16 forming each pair are deformed in closed legs, their inner side surfaces 14a, 14a and 16a, 1
The opening angle of 6a is made substantially smaller than the opening angle of each leg 14, 14 and 16, 16.
The component force of the abutting force of 4 and 16, 16 on the mounting holes 30, 32 can be advantageously exerted in the fastening direction of the teeth 26, 28, and a large fastening force can be efficiently exerted. In addition, in addition, the same effects as those of the first embodiment can be effectively exhibited.

Next, FIGS. 7 and 8 show a connecting fixture 44 as yet another embodiment of the present invention. Note that, also in this embodiment, the same reference numerals as those in the first embodiment are used in the drawings for the parts having the same structures as those in the first embodiment, and the detailed description thereof will be omitted.

In the connecting fixture 44 of this embodiment, the leg portions 14, 14 and 16, 16 forming each pair are
The central portion 12 is formed so as to have linear inner and outer side surfaces 14a, 14b and 16a, 16b with a substantially constant width. That is, in the connecting fixture 44 of the present embodiment, the bulging portions (18, 20, 38, 40) as in the first and second embodiments are not formed on any of the legs. is there.

Further, the leg portions 14, 14 and 16, 16 forming each pair are located near the extending tip portions, respectively, and extend in a direction substantially orthogonal to the extending direction and the opening / closing direction of the leg portions. , A pin-shaped locking protrusion 4 protruding on one surface
6,46 and 48,48 are projected. In this embodiment, the locking protrusions 46 and 48 are respectively
It is formed in the shape of a circular rod having a circular cross section of a substantially integral size in the length direction.

As shown in FIG. 7, in the connecting fixture 44 of this embodiment, the leg parts 14, 14 and 16, 16 forming each pair are stored in the opened form. , By being deformed at low temperature, as shown in FIG. 9, each pair of legs 14, 14 and 16, 16
Have their legs closed, and are kept closed under a low temperature condition.

In order to connect and fix teeth using the connecting fixture 10 having such a structure, first, as shown in FIG. 10, the engaging holes 5 are formed for the teeth 26, 28 to be connected.
0,52 forming legs 14,14 and 16,16 of the connecting fixture 10 kept at a low temperature and kept closed
Locking protrusions 46, 46 and 48, 48 protruding from the
Each is inserted into each engagement hole 50 and 52. Then, after that, the temperature of the connecting fixture 10 is raised to a temperature higher than the reverse transformation end temperature.

As a result, the leg portions 14, 14 and 16, 16 forming each pair of the connecting fixture 44 are respectively deformed in the leg opening direction by the shape memory effect, and the leg portions 14, 14 and 16 are respectively deformed. , 16 have locking protrusions 46, 46 and 48, 48, respectively, for the tooth 2
By abutting and fitting the inner peripheral surfaces of the engaging holes 50, 52 formed in the teeth 6, 28, the fastening force is exerted between the teeth 26, 28.

At this point, the connecting fixture 44 of this embodiment is used.
Then, the engaging holes 50, 52 in the teeth 26, 28
By appropriately setting the shape of the inner peripheral surface of the engaging projections 46 and 48 (the curvature and the inclination angle of the contacting portions of the engaging projections 46 and 48) with respect to the inner peripheral surfaces of the engaging holes 50 and 52, 48, 48 a connecting fixture exerted by abutting
The component force of the contact force based on the restoring force of 4 is
Can be advantageously exerted in the fastening direction of the connecting fixture 4
The positioning force for the four teeth 26, 28 can be advantageously exerted, and thereby a large fastening force can be efficiently exerted as in the first embodiment.

Moreover, in the connecting fixture 44 of this embodiment, it is not necessary to bury the entire connecting fixture 44 inside the tooth, and the engaging holes 50, 5 with which the engaging protrusions 46, 48 engage.
Since only 2 need be formed, there is also an effect that the cutting amount of the teeth 26, 28 can be reduced.

As shown in FIG. 11, it is possible to provide a large-diameter hook portion 54 at the tip of the engaging projections 46, 48. Then, the engagement holes 5 of the teeth 26, 28
If an undercut portion is provided at 0, 52 and the hook portion 54 is locked there, the connecting fixture 44 can be more firmly fixed to the teeth 26, 28, and the connection is made. The fixing tool 44 can be effectively prevented from coming off from the teeth 26, 28.

Even in the connecting fixture having the engaging projections 46, 48, the leg portions 14, 14 and 16, 16 forming each pair are closed as in the second embodiment. The leg portions 14, 14 and 16, 16 forming each pair are memorized and deformed at a low temperature so that the leg portions 14, 14 and 16, 16 are opened, respectively, and the fastening force for the tooth is obtained based on the shape memory action that restores in the closed leg direction. Of course,
It is possible.

Although the embodiments of the present invention have been described in detail above, these are literal examples and the present invention should not be construed as being limited to such specific examples.

For example, in the connecting fixtures 10 and 36 in the first and second embodiments, each leg 1
4, 16, one for each bulge 18, 20, 3
8 and 40 are formed, and in the connecting fixture 44 in the third embodiment, one locking projection 46 and 48 is formed for each leg portion 14 and 16.
The number of bulges and locking projections is not limited, and it is possible to form two or more bulges and locking projections for each leg 14, 16.

In each of the connecting fixtures 10 and 36 in the first and second embodiments, each leg 1
Bulge parts 18, 20, 38, 40 at 4, 16
However, the circular shape or the elliptical shape having the curved outer peripheral edge portion is formed, but the specific shape is not limited, and, for example, as shown in FIG. It is also possible to employ triangular bulging portions 58 and 60 having an outer peripheral edge portion formed of a surface. In addition,
FIG. 12 is a diagram corresponding to FIG. 1, and in order to facilitate understanding, the same reference numerals as those in the first embodiment will be attached to the respective corresponding portions.

Further, in the above-mentioned embodiment, a specific example of the present invention applied to a tooth connecting and fixing device is shown. In addition, a connecting and fixing device for orthodontic correction and a denture connected to a healthy tooth The present invention can be similarly applied to a connecting and fixing tool for forming a bridge structure or a connecting and fixing tool for a bone that connects and fixes a fractured part.

The overall size of the connecting fixture according to the present invention and the size and specific shape of each leg are appropriately determined according to the application site, required fastening force and the like. , But not limited to. In particular,
In the above embodiment, each pair of legs 14, 14 and 16, 1
Although the lengths of 6 are set to be different from each other, it is of course possible to form them with the same length.

Further, the inner side surfaces 14a and 16a of the leg portions 14 and 16 of the connecting fixture 10 of the first embodiment and the outer side surfaces 14b and 16b of the leg portions 14 and 16 of the connecting fixture 36 of the second embodiment, respectively. Further, the connecting fixture 44 of the third embodiment
Both sides 14a, 14b, 1 of each leg 14, 16 in
6a and 16b do not necessarily have to be linear,
It may be curved or the like.

Furthermore, the connecting fixture 10 of the above embodiment,
The base holes 22 and 24 formed in 36 and 44 do not necessarily have to be provided, and the leg portions 14 and 16 can be formed in a rod shape instead of a plate shape.

Although not listed one by one, the present invention
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0051]

As is apparent from the above description, the connecting and fixing device having the structure according to the present invention, in which each leg is formed with a bulge protruding forward in the opening / closing direction due to the shape memory effect. In the case of, when the side surface of the leg portion on which the bulge portion is formed is brought into contact with the body to be coupled when mounted on the body to be coupled, the side surface of the leg portion is formed into a curved surface or the like by the bulge portion. Since the contact component force is exerted on the connected body in the fastening direction in an advantageous manner, the restoring force based on the shape memory effect can be efficiently used as the fastening force, and a large fastening force is exerted. It can be done.

Further, in the connecting fixture having the structure according to the present invention, in which the locking projections are formed on the respective leg portions, the locking projections are brought into contact with each other when being mounted. By appropriately setting the shape of the contact surface of the connecting body, the contact component force exerted on the connected body by the contact of the locking projection is exerted advantageously on the connected body in the fastening direction. There is a restoring force based on the shape memory effect,
It can be efficiently used as a fastening force, and a large fastening force can be exerted.

In addition, in the connecting fixture having the locking projections formed as described above, only the engaging surface with which the engaging projections engage is formed when it is mounted on the body to be connected. There is also an advantage that it is possible to reduce the amount of processing such as cutting for the connected body.

Further, in the connecting fixture in which the base end portion of the cut portion between each pair of leg portions has an arcuate surface, the concentration of stress when the leg portions are opened and closed is relaxed, The effect of preventing the occurrence of defects such as cracks can also be exhibited.

Furthermore, in the case of a connecting fixture formed of a plate-shaped body having a substantially integrated thickness, the plate-shaped body can be formed by punching or the like, so that the manufacturing is easy and the cost is reduced. The effect of being able to be achieved can also be exhibited.

[Brief description of drawings]

FIG. 1 is a plan view showing a memorized shape of a connecting fixture as one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view showing a deformed shape of the connecting fixture shown in FIG. 1 before being restored by a shape memory function before being mounted.

FIG. 4 is an explanatory view showing a state in which teeth are fastened using the connecting fixture shown in FIG.

FIG. 5 is a plan explanatory view showing a deformed shape of the connecting fixture as a further embodiment of the present invention before being restored by a shape memory action before being mounted by a solid line, and showing a stored shape by an imaginary line.

FIG. 6 is an explanatory view showing a state in which teeth are fastened using the connecting fixture shown in FIG.

FIG. 7 is a plan view showing, in a memorized shape, a connecting fixture as still another embodiment of the present invention.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a plan view showing a deformed shape of the connecting fixture shown in FIG. 7 before being restored by a shape memory function before being mounted.

FIG. 10 is an explanatory diagram showing a state in which teeth are fastened using the connecting fixture shown in FIG.

FIG. 11 is a side view of essential parts showing another specific example of the locking projection that can be adopted in the connecting fixture shown in FIG. 7.

FIG. 12 is a plan view corresponding to FIG. 1, showing a connecting fixture as a further embodiment of the present invention in a stored shape.

FIG. 13 is a plan view showing a specific example of a conventionally known connecting fixture for teeth.

[Explanation of symbols]

 10, 36, 44 Connection fixing tool 12 Central part 14, 16 Leg part 14a, 16a Inner side surface 14b, 16b Outer side surface 18, 20, 38, 40, 58, 60 Bulge part 22, 24 Base end hole 26, 28 Teeth 30 , 32 Mounting holes 46, 48 Locking protrusions 50, 52 Engaging holes

Claims (4)

[Claims] 1. A medical coupling fixing tool that is mounted between connected bodies of teeth or bones to connect and fix the connected bodies to each other, each pair of pairs extending from opposite sides of the central portion in opposite directions. It has legs and is formed of a predetermined shape memory alloy material, and the shape of each pair of legs that opens or closes is remembered, and the legs that make each pair are opened and closed by a shape memory action. A medical connecting fixture characterized in that it has bulges protruding in the opening / closing direction on both outside surfaces or both inside surfaces located on the front side in the direction. 2. A medical connecting fixture that is mounted between connected bodies of teeth and bones to connect and fix the connected bodies to each other, each pair of pairs extending from the central portion to both sides in the opposite direction. It has legs and is formed of a predetermined shape memory alloy material, and the shape that each pair of legs opens or closes is remembered, and the legs that make each pair are opened and closed by a shape memory action. A medical connecting and fixing device having a locking projection protruding in a direction substantially orthogonal to the direction. 3. The arc-shaped surface according to claim 1 or 2, wherein a base end portion of the cut portion between the leg portions forming each pair is an arc-shaped surface that becomes a substantially circular hole when the leg portions are closed. Medical connecting fixture. 4. The medical connecting and fixing device according to claim 1, wherein the whole including the central portion and each of the pair of leg portions is formed of a plate-shaped body having a substantially constant thickness.