WO2006013670A1

WO2006013670A1 - Medical external fixation device

Info

Publication number: WO2006013670A1
Application number: PCT/JP2005/009533
Authority: WO
Inventors: Koichi Yoshino
Original assignee: Yoshino Industry, Co., Ltd.
Priority date: 2004-08-03
Filing date: 2005-05-25
Publication date: 2006-02-09
Also published as: WO2006013624A1

Abstract

A hybrid type medical external fixation device that can achieve a prompt social rehabilitation and can prevent any transformation due to degenerative joint disorder, and that can ease operating skills. There is provided a medical external fixation device comprising a proximal pin permitting piercing in the radius; a distal pin permitting piercing in the ossa digitorum (ossa metacarpalia); fracture site pins permitting piercing in bone pieces resulting from fracturing of the wrist joint; proximal pin clamp (6) capable of holding and immobilizing the proximal pin; distal pin clamp (7) capable of holding and immobilizing the distal pin; fracture site pin clamp (70) capable of holding and immobilizing a multiplicity of fracture site pins arranged; first rodlike member (11a) coupling the proximal pin clamp (6) with the fracture site pin clamp (70); and second rodlike member (11b) coupling the distal pin clamp (7) with the fracture site pin clamp (70), wherein the distal pin, the distal pin clamp (7) and the second rodlike member (11b) are detachable in the process of medical treatment.

Description

Specification

External fixator

Technical field

TECHNICAL FIELD [0001] The present invention relates to an external fixator used for fixing a fractured part, and more particularly to an external fixator suitable for a wrist joint fracture.

Background art

[0002] Fractures in the wrist joints can be treated with manual reduction and cast fixation before! / In the case of unstable fractures and intra-articular fractures, even if they have been reduced, casts etc. Then, there are many cases in which rearrangement is performed again and the daily operation is immediately disturbed.

Therefore, surgical treatment is desired for severe fractures, but the typical treatment is external fixator. In recent years, it has become clear that adequate functional recovery can be obtained by using an external fixator appropriately for severe fractures. Currently, as an external fixator used for fracture of a wrist joint, as shown in FIG. 12, the external fixator crosses the wrist joint and reduces the bone fragment by pulling (for example, Non-Patent Document 1). ) And Non Bridge Type (for example, Patent Document 1) in which the external fixator fixes the bone fragment with a thin pin without straddling the wrist joint.

[0003] Further, Patent Document 2 discloses a non-bridge type external fixator that allows pin insertion from a plurality of directions.

Patent Document 1: JP 2002-172119 A

Patent Document 2: JP 2003-305049 A

Special literary reference 1: http://www.keiseimed.com/ seihin_flame.htm

Disclosure of the invention

Problems to be solved by the invention

[0004] Conventional external and external bridge type non-bridge type external fixators have the following advantages and disadvantages.

That is, as an advantage of the Bridge Type, in consideration of damage to the joint surface of the wrist joint caused by a fracture, it does not apply pressure to the joint surface damaged by traction. The articular cartilage is preserved. By protecting, future degenerative arthritic changes can be prevented. As a disadvantage

Therefore, a long traction period (about 6 to 8 weeks) is required, and in order to restrict the movement of the wrist joint and pull it, the joint contracture of the wrist joint due to worm muscle ischemia etc. There was a problem that a decrease and bone atrophy were recognized.

As an advantage of Non Bridge Type, the bone fragment can be fixed with a pin and the joint surface of the wrist joint can be reduced, so that the range of motion of the joint can be moved earlier. The disadvantage is that the surgical assistant pulls the wrist joint by hand and uses a pin to fix the bone fragment in the reduced position, so it cannot be pulled continuously. Therefore, there is a problem that pressure is applied to the damaged joint surface and the cartilage on the joint surface cannot be protected, and there is no problem in the short term, but degenerative arthritic changes may occur in the long term.

[0005] Therefore, the present invention has been made in view of the problems of the above-described conventional two types of external fixators, and enables early rehabilitation while preventing degenerative arthritic changes. In addition, it aims to provide a hybrid type external fixator with a simple surgical technique.

Means for solving the problem

[0006] In order to solve the above problems, an external fixator according to the present invention includes a proximal pin that can be inserted into a rib,

A distal pin that can be inserted into the phalange (metacarpal bone);

A fracture pin that can be inserted into a bone fragment caused by a fracture of a wrist joint;

A proximal pin clamp capable of pinching and fixing the proximal pin;

A distal pin clamp capable of pinching and fixing the distal pin;

A plate-like member provided with an insertion groove for inserting the fracture portion pin, and capable of arranging and fixing a number of the fracture portion pins;

The proximal pin clamp, the distal pin clamp, and a rod-like member for connecting and fixing the plate-like member;

The plate-like member is elastically deformed by a tightening force of a side force, and the fracture pin is clamped and fixed in the attachment groove,

The gist is that the distal pin is configured to be removable in the course of treatment.

[0007] Further, the external fixator according to the present invention includes a proximal pin that can be inserted into the rib, A distal pin that can be inserted into the phalange (metacarpal bone);

A distal pin clamp capable of pinching and fixing the distal pin;

A plate-like member capable of arranging and fixing a number of the fracture portion pins;

The plate-like member has a protruding portion that is extended and can fix and fix the proximal pin, the distal pin clamp, and a rod-like member that connects and fixes the plate-like member. It is essential that the distal pin and the rod-like member are configured to be removable.

[0008] Further, in the external fixator according to the present invention, the plate-shaped member is provided with a number of screw holes or attachment grooves for inserting the fracture portion pins, and the fracture portion pins are provided in a large number. Can be fixed

The gist of the invention is that the protruding portion is provided with a screw hole or an insertion groove for inserting the proximal pin so that the proximal pin can be disposed and fixed.

[0009] In addition, the external fixator according to the present invention is provided with a number of screw holes for inserting the fracture pin in the plate-like member, and for inserting the proximal pin in the protruding portion. When providing a screw hole of

A tapered part is formed on the pin head side surface of the fracture pin and the proximal pin,

A taper portion having the same shape as the tapered portion is formed in the screw hole of the plate-like member and the protruding portion,

By pinching the pin head of the fracture pin and the proximal pin to the plate-like member and the screw hole of the protruding part, respectively,

The gist is that the pin heads of the fracture pin and the proximal pin do not protrude from the upper surfaces of the plate-like member and the protruding portion, respectively.

[0010] Further, the external fixator according to the present invention includes a proximal pin that can be inserted into the rib,

A distal pin that can be inserted into the phalange (metacarpal bone);

A proximal pin clamp capable of holding and fixing the proximal pin;

A distal pin clamp capable of holding and fixing the distal pin; A plurality of fracture pin pins, a fracture pin clamp capable of holding and fixing; a first rod-like member connecting the proximal pin clamp and the fracture pin clamp; the distal pin clamp and the fracture And a second rod-shaped member that connects the partial pin clamp, and the distal pin, the distal pin clamp, and the second rod-shaped member are configured to be removable in the course of treatment.

[0011] Further, in the external fixator according to the present invention, the fracture portion pin clamp includes:

A fastening portion for fastening and fixing the first rod-shaped member and the second rod-shaped member;

An arch-shaped projecting piece formed by projecting from the fastening portion;

A clamping plate disposed to face the arched projecting piece,

A staking groove that allows the fracture pin to pass through is formed between the arch-shaped projecting piece and the clamping plate, and the fracture pin is clamped and fixed in the staking groove. The gist.

The invention's effect

[0012] According to the present invention, since the proximal pin that can be inserted into the radius and the distal pin that can be inserted into the phalange (metacarpal bone) are provided, pressure is not applied to the joint surface damaged by traction. Protecting the articular cartilage can prevent future degenerative arthritic changes.

And since it has the fracture | rupture part pin which can be inserted in the bone fragment produced by the fracture of a wrist joint, long-term traction becomes unnecessary. Therefore, by removing the distal pin during the course of treatment, it is possible to move within the range of motion at an early stage, preventing joint contracture of the wrist joint due to worm-like muscle ischemia, lowering of the movement function of the fingers, and bone atrophy. be able to.

[0013] Further, according to the present invention, since a number of fracture portion pins are arranged and fixed, the fracture portion pins can be inserted from a plurality of directions into a bone fragment caused by a fracture of the wrist joint portion. Therefore, it can be effectively used even when it is desired to use a large number of fracture pin pins for grinding fracture or the like.

Further, according to the present invention, the bone fragment can be reduced by towing, and the fracture pin can be easily driven in the bone reduction position, so that the surgical technique is simplified.

Brief Description of Drawings

FIG. 1 is a perspective view of an external fixator according to a first embodiment. FIG. 2 (a) is a front view of a clamp and a support. (b) It is a rear view of a clamp and a support body. (C) It is a side view of a clamp and a support body. (D) It is a top view of a clamp and a support body.

FIG. 3 is a side view of an arched plate and a support.

FIG. 4 (a) is a cross-sectional view of a fracture pin and an arched plate. (b) It is a figure which shows the attachment condition of a fracture part pin.

FIG. 5 is a view showing a usage state of the external fixator according to the first embodiment.

FIG. 6 is a perspective view of an external fixator according to a second embodiment.

FIG. 7 is a view showing a usage situation of the external fixator according to the second embodiment.

FIG. 8 is a perspective view of an external fixator according to a third embodiment.

FIG. 9 is a top view of an arched plate.

FIG. 10 is a diagram showing a state of insertion of a fracture pin.

FIG. 11 is a view showing a modification of the external fixator according to the first embodiment.

FIG. 12 is a diagram showing a prior art.

FIG. 13 is a perspective view of an external fixator according to a fourth embodiment.

FIG. 14 is a plan view of an external fixator according to a fourth embodiment.

Explanation of symbols

1 External fixator

2 Proximal pin

3 Distal pin

4 Fracture pin

5, 5 'arched plate

6 Proximal pin clamp

7 Distal pin clamp

8, 9, 10 support

10a, 10b support

11 Rod member

11a First rod-shaped member lib 2nd rod

12 Screw hole

20, 21 Holding plate

20, sandwich plate

20 "clamping plate

22, 23 Fastening screw 2 'Fastening screw

4, 24, 24, Fastening part 5 Back plate

6 Holding plate

7, 27 'Clamping screw 7 "Clamping screw 7a Screw hole

8 Fastening screw

8a, 28b Fastening screw 0 pin head

1, 32 Taper 3 Pin tip

0 ribs

1 phalange (metacarpal bone) 2 ulna

0 Splashing part

1 Screw hole

0, 61 Insertion groove 0a Adhesion groove

2, 64 Tightening screw 3, 65 nut

6, 66, screw holes 67, 67 'screw hole

70 Fracture pin clamp

71 Fastening part

72 Arched protrusion

73 Nipping plate

74 Tightening screw

75 Receiver

76 Fastening screw

P Tightening force

BEST MODE FOR CARRYING OUT THE INVENTION

[0016] An external fixator according to the present invention has a proximal pin and a distal pin, and is mounted across a fractured portion (distal radius end) of a wrist joint. Pins are inserted into the ribs and phalanges (metacarpal bones), respectively. Two to three proximal and distal pins are arranged.

The proximal pin and the distal pin are each held and fixed by a member such as a clamp, and further connected by a rod-like member. This makes it possible to reduce and fix the bone fragment of the fractured part by towing.

As will be described later, at least the distal pin is configured to be removable during the treatment process.

Furthermore, in the present invention, a “fracture pin” is disposed at a position intermediate between the proximal pin and the distal pin, that is, at the position of the fracture portion of the wrist joint, and inserted into the bone fragment generated by the fracture. . Considering the cases of fractures of the ribs and merging with ulna fractures, many fracture pins can be inserted, and preferably about 2 to 10 can be placed. For this purpose, in the present invention, a plate-like member having a certain area is used, and means capable of inserting and fixing a large number of fracture pin pins such as screw holes and attachment grooves is provided on the member. In addition, if the plate-like member is formed as an arch-type plate adapted to the shape of the wrist, it is preferable that a number of fracture pin can be inserted from a plurality of directions at different angles.

The plate-like member that holds and fixes the fracture pin is connected and fixed to the rod-like member. It is possible to remove the distal pin inserted into the phalange (metacarpal bone) after about 2 to 3 weeks after the formation of the callus at the fracture site. It becomes.

[0018] Further, all or a part of the plate-like member may be extended to the palm side, and a means for disposing and fixing the proximal pin to the extended portion may be provided. By rubbing in this way, it becomes possible to perform traction without connecting the proximal pin to the rod-shaped member via a member such as a clamp, and it is possible to remove the rod-shaped member together with the distal pin after the traction period has elapsed. Become.

[0019] For the proximal pin, the distal pin, and the fracture pin, a durable material that has little influence on the human body such as titanium alloy and stainless steel is used. The size (diameter) of each pin is preferably 3 to 4 mm for the proximal pin, 2 to 3 mm for the distal pin, and 1 to 4 mm for the fracture pin in consideration of the strength and location used. The tip of the pin should be shaped like a screw to improve the fixation to the bone.

In addition, plate-like members are preferably formed using X-ray transparent materials such as carbon fiber and plastic.

The rod-shaped member, clamp, and other members may be of any material and shape as long as they can exhibit the function of the external fixator according to the present invention.

Example 1

[0020] A first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the external fixator (1) according to the present embodiment has two proximal pins (2) and two distal pins (3) at both ends of the rod-like member (11). Are arranged via clamps (6) (7) and supports (8) (9), respectively, and a desired number of fracture pins (4) are placed between them in an arched plate (5). These are arranged via the support (10).

[0021] As shown in Figs. 2 (a) to (d), the support (8) (9) is formed by a pair of clamping plates (21), and by screwing a fastening screw (23), It is fixed to the rod-shaped member (11). Similarly, the clamps (6) and (7) are also formed by a pair of clamping plates (20), and the fastening screws (22) are screwed to hold the pins (2) and (3) while holding the pins (2) and (3). ) Fixed to (9). Grooves having a semicircular cross section are formed on the opposing surfaces of the clamping plates (20) and (21) so that the pin (2) (3) and the rod-shaped member (11) can be stably clamped. ing. The supports (8) and (9) can be fixed at an arbitrary rotation angle with respect to the axial direction of the rod-shaped member (11), and the clamps (6) and (7) are fixed to the axial direction of the rod-shaped member (11). It can be fixed at an arbitrary rotation angle with respect to the vertical direction (axial direction of the fastening screw (22)). For this reason, the proximal pin (2) or the distal pin (3) can be inserted at various angles.

As shown in FIG. 1, the arched plate (5) is a plate-like member having an arc shape with a central angle (0) within 180 ° and having a certain width and thickness. The reason why the central angle (0) is set within 180 ° is that an angle larger than 180 ° is not necessary as a sufficient angle for inserting the pin from the back side in the wrist joint.

As shown in FIG. 1, both ends of the arched plate (5) are bent to form fastening portions (24) and (24 ′), and as shown in FIG. 3, through the backing plate (25). The arched plate (5) is fixed to the support (10) by screwing the fastening screw (27). The support (10) is formed by a pair of clamping plates (26). The fastening part (24) can be fixed at an arbitrary rotation angle with respect to the axial direction of the rod-like member (11) and the direction perpendicular to the axial direction (axial direction of the fastening screw (27)). It is possible to insert the fracture pin (4) at The arched plate (5) may be screwed directly to the clamping plate (26) without the support plate (25).

The clamping plate (20) constituting the clamp (6) (7) and the receiving plate (25) of the arched plate (5) or the clamping plate (21) constituting the support body (8) (9) are supported. If a common member is used for each of the clamping plates (26) constituting the body (10), the number of members can be reduced.

As shown in FIG. 1, the arched plate (5) is provided with a plurality of screw holes (12) for fastening and fixing the fracture pin (4). In this embodiment, four rows of screw holes (12) are formed at equal intervals in a concentric manner.

As shown in FIG. 4 (a), a tapered portion (31) is formed on the side surface of the pin head (30) of the fracture pin (4), and a male screw is engraved on the tapered portion (31). Yes. In addition, a taper portion (32) having the same shape as the taper portion (31) on the side surface of the pin head (30) is also formed in the screw hole (12) drilled in the arched plate (5). When the fracture pin (4) is inserted and screwed, the pin head (30) is flush with the top surface of the arched plate (5) as shown in Fig. 4 (b). It has a structure that forms a surface and is flush with the surface. As shown in FIG. 1, the pin head (30) is provided with a wrench groove (30a) so that it can be attached to and detached from the screw hole (12) using a dedicated wrench or the like.

Next, a usage example of the external fixator according to the present embodiment will be described. As shown in Fig. 5, an arched plate (5) is placed at the position of the wrist joint, and the fracture pin (4) is inserted into the rib (40) fragment caused by the fracture, and the arched plate is inserted. Fix it to the plate (5). The necessary number of fracture pins (4) can be inserted into a desired position of the screw hole (12) of the arched plate (5) according to the fracture condition.

The rib (40) (proximal) and phalange (metacarpal) (41) (distal) are held by the clamp (6) (7) via the support (8) (9), respectively. Insert the proximal pin (2) and the distal pin (3), and reduce and fix them while pulling the hand joint. About 2 to 3 weeks after the external fixator (1) was attached, the callus formation at the fracture started and the bone fragment began to stabilize, so the distal bone inserted into the phalange (metacarpal bone) (41) The position pin (3), the clamp (7) holding it, and the support (9) can be removed.

The arrangement positions of the clamps (6) (7), the arched plate (5), etc. can be adjusted as appropriate according to the patient's case.

The proximal pin (2) and the distal pin (3) in this embodiment may be arranged and fixed by the arched plate (5 '), like the distal pin in the second embodiment. ! ヽ (see Figure 6).

[0025] As described above, according to this embodiment, the clamp (6) (7) and the arched plate (5) force can be fixed to the support body (8) (9) (10) at a desired rotation angle. And the support (8) (9) (10) can be fixed at a desired rotation angle with respect to the rod-like member (11), so that the proximal pin (2), the distal pin (3), The fracture pin (4) can be inserted at various angles, and reduction from various directions becomes possible. In particular, since the arched plate (5) is provided with a large number of screw holes (12), it is possible to dispose the necessary number of fracture pins at the required positions. In addition, since the pin head (30) of the fracture pin (4) is screwed in without protruding from the upper surface of the arched plate (5), the safety of daily operations of the patient is improved.

[0026] As shown in Fig. 11 as a modification of the present embodiment, a pair of clamping plates (20,) (20,) are attached by screwing 2 to 4 fastening screws (22 '). so Fracture pin (4) Try to clamp 2 to 3 pins. The holding plate (20 ′) is formed in an L shape, and is fixed to the support (10) by screwing a fastening screw (27 ′ ′).

Even when the external fixator (1) is configured in this way, the bone fragment of the fracture can be reduced and fixed by pulling with the proximal pin (2) and the distal pin (3), and the fracture pin Long-term traction is not required because (4) is inserted into the fractured bone fragment and fixed, and the distal pin (3), clamp (7), and support inserted into the phalange (metacarpal) The body (9) can be removed during the course of treatment.

Example 2

A second embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 6, the external fixator (1) according to the present embodiment has two distal pins (3) at one end of a rod-like member (11), an arched plate (5 ′), and a support body. (9), and support the arched plate (5), the proximal pin (2), and the desired number of fracture pins (4) on the other end of the rod-shaped member (11). It is arranged via the body (10).

[0028] As shown in FIG. 6, the external fixator (1) according to the present embodiment is configured such that a part of the arched plate (5) is partly parallel to the rod-shaped member (11) on the back side. The projecting portion (50) is formed by extending to. In the protruding part (50), three screw holes (51) are drilled in parallel with the rod-shaped member (11), and the pin head of the proximal pin (2) protrudes in the same manner as in FIG. It is configured to be screwable so as to be flush with the upper surface of the portion (50).

In this embodiment, the distal pin (3) is arranged and fixed using an arched plate (5 ′). The distal pin (3) is a fracture pin (4) or a proximal pin. Similar to (2), the pin head is designed not to protrude.

The arched plate (5) (5 ') is formed by screwing the fastening part (24) (24 ") to the support (10) (9) by the fastening screw (27) (27'), respectively. The rod-like member (11) is fixed.

[0029] FIG. 7 is a diagram illustrating a usage example of the external fixator (1) according to the present embodiment. Also in this example, the proximal pin (2) and the distal pin (3) were inserted into the radius (40) and the phalange (metacarpal) (41), respectively, to the wrist joint. Reduce and fix while towing. And about 2-3 weeks have passed Later, the distal pin (3) inserted into the phalange (metacarpal) (41), and the arched plate (5 ') holding this, the force that can remove the support (9) proximal pin Since (2) is fixed integrally with the arched plate (5), the rod-shaped member (11) and the support (10) of the arched plate (5) can be removed.

In addition, the arched plate (5) according to the present embodiment is provided with fastening portions (24) and (24 ') at both ends, and a protruding portion (50) is formed at the center, which is symmetrical. Because it is configured, it can be used by wearing even if it is a left or right hand.

[0030] As described above, according to the present embodiment, the distal pin (3), the arch plate (5 '), the support (9) is about two to three weeks after the external fixator (1) is mounted. The rod-shaped member (11) can be removed, and the patient wears the remaining weeks only with the arched plate (5) and the proximal pin (2) and the fracture pin (4) secured to it. Therefore, it is sufficient to spend it, and the annoyance is reduced. The structure of the proximal pin (2), the distal pin (3), and the fracture pin (4) does not protrude. Will be improved.

Further, according to the present embodiment, an external fixator that can be attached to either the left or right hand with the same member can be provided, which is very convenient.

Example 3

[0031] A third embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 8, the external fixator (1) according to the present embodiment has two distal pins (3) clamped on one end of a rod-like member (11) (7) and a support (9). A desired number of proximal pins (2) and fracture pins (4) are arranged on the other end of the rod-like member (11) via the arched plate (5) and the support (10). It is to be established.

[0032] The external fixator (1) according to the present embodiment replaces the screw holes (12) (51) of the arched plate (5) and the projecting part (50) with the mounting groove (60) ( 61).

The grooving groove (60) through which the fracture pin (4) can be passed is a notch of the arched plate (5) with a width approximately equal to the diameter of the fracture pin (4), as shown in Fig. 8. These are arranged in a direction perpendicular to the rod-like member (11). Similarly, the fitting groove (61) through which the proximal pin (2) can pass is a bar-like member having a notch in the protruding portion (50) with a width corresponding to the diameter of the proximal pin (2). (11) are arranged in parallel. [0033] As shown in Fig. 9, the fracture pin (4) inserted into the attachment groove (60) is provided with a screw provided on the side surface of the arched plate (5) and the inner surface of the attachment groove (60). It is fixed by a tightening force (P) generated by screwing a tightening screw (62) and a nut (63) disposed through the holes (66) (66 '). That is, the arched plate (5) is elastically deformed by the tightening force (P), and the fracture pin (4) is clamped and fixed in the fastening groove (60).

Similarly, the proximal pin (2) is also tightened by being threaded through the screw holes (67) (67 ') provided in the side surface of the protruding portion (50) and the inner surface of the fitting groove (61). The clamping force (Q) generated by the screwing of the screw (64) and the nut (65) is clamped and fixed in the fitting groove (61).

Therefore, in this embodiment, the arched plate (5) and the protruding portion (50) are provided with the tightening force (P) (Q) of the tightening screw (62) (64) and nut (63) (65). Therefore, a material (for example, carbon fiber or plastic) that causes the elastic deformation as described above and can clamp and fix the fracture pin (4) and the proximal pin (2) is used.

Further, since the fracture pin (4) and the proximal pin (2) are fixed as described above, the fracture pins (60) (61) in the perforation grooves (60) (61) that do not interfere with the tightening screws (62) (64) are provided. If it is a position, it can be placed at any position.

Furthermore, as shown in FIG. 10, the insertion angle can be varied for each pin.

[0034] As described above, according to the present embodiment, the fracture pin (4) and the proximal pin (2) are respectively connected to the fixation groove (60).

It becomes possible to arrange the required number at a desired position in (61).

Furthermore, since the insertion angle can be changed for each pin, it is possible to take detailed measures according to the patient's symptoms.

Example 4

A fourth embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 13 to 14, the external fixator (1) according to the present embodiment includes a proximal pin clamp (6) and a proximal pin clamp (6) capable of holding and fixing a proximal pin and a distal pin (not shown), respectively. A number of distal pink lamps (7) and fracture pin pins (not shown) are arranged to hold and fix the fracture pink pin lamps (70), and a proximal pin clamp (6) and distal pink pin. The first rod-shaped member (11a) and the second rod-shaped member (1 lb) for connecting the ramp (7) and the fractured pink lamp (70), respectively, are omitted. [0036] As shown in Figs. 13 to 14, the proximal pin clamp (6) is disposed and fixed to one end of the first rod-like member (11a) via a support (8).

The support (8) is formed in a substantially cylindrical shape, and is fixed to the first rod-like member (11a) penetrating the peripheral surface by screwing a fastening screw (23) at one end. A proximal pin clamp (6) is screwed to the other end of the support (8) by a fastening screw (22).

[0037] The proximal pin clamp (6) has a pair of clamping plates facing each other so as to have a cross-sectional shape capable of vertically penetrating two proximal pins, and is screwed by a fastening screw (22). The proximal pin is now held and fixed to the proximal pin clamp (6)!

On the other hand, the distal pin clamp (7) is also disposed and fixed to one end of the second rod-shaped member (l ib) through the support (9) in the same manner as described above. ib) is longer than the first rod-like member (11a).

[0038] With the above-described configuration, the proximal pin and the distal pin can be inserted into the radius and the phalange (metacarpal bone) at all angles, respectively. The proximal pin clamp (6) and the distal pin clamp (7) can be mounted at any position in the length direction of the first rod member (11a) and the second rod member (l ib), respectively. Yes.

[0039] As shown in Figs. 13 to 14, the fracture portion pin clamp (70) has a predetermined thickness and size, and is a fastening portion (X-ray transmissive material formed in a substantially rectangular shape ( 71). On the left and right sides of the fastening part (71) (in a direction substantially perpendicular to the radial direction), an arch-shaped projecting piece that is an elongated flat plate with the same X-ray transmitting material force and forms an arch shape along the wrist joint (72) protrudes and is formed.

In this embodiment, two arch-shaped protrusions (72) are formed on the left and right sides of the fastening part (70), respectively. 1S The length of the left and right arch-shaped protrusions (72) is different. Anyway!

[0040] As shown in FIG. 13 to FIG. 14, the X-ray transparent material force is also provided on the outer side of the arched projecting piece (72) corresponding to the shape of the arched projecting piece (72). A sandwich plate (73) which is an elongated flat plate and is formed into an arch shape along the wrist joint is disposed to face the arch-shaped projecting piece (72).

The clamping plate (73) is screwed and fixed to the arched projecting piece (72) by the fastening screw (74), and between the clamping plate (73) and the arched projecting piece (72), A fitting groove that allows the fracture pin to pass through ( 60a) is formed, and the fracture pin inserted into the fastening groove (60a) is clamped and fixed in the fastening groove (60a) by the fastening force accompanying the screwing of the fastening screw (74). It is becoming like that.

[0041] On the upper surface of the fastening portion (71), as shown in FIGS. 13 to 14, a receiving portion (75) disposed at a predetermined interval substantially parallel to the radial direction is provided with a fastening screw ( It is fastened and fixed by 76). The receiving part (75) is fitted with a fastening part (71), a proximal pin clamp (6) and a distal pin clamp (7) of the first rod member (11a) and the second rod member (l ib). Respective end portions that are not connected are detachably connected via support members (10a) and (10b).

The supports (10a) and (10b) are formed in a substantially U-shaped cross section, and the first rod-shaped member (11a) and the second rod-shaped member (l ib) is clamped and fixed, and is held on the side of the receiving part (75). The support (10a) (1 Ob) may have another shape as long as it can hold the rod-shaped member (11a) (l ib).

In this embodiment, as shown in FIGS. 13 to 14, the first rod-like member (11a) and the second rod-like member (1 lb) are positioned with respect to each other so that they are not on the same straight line. However, it is possible to improve the degree of freedom of the fixing angle of the rod-shaped member (11a) (lib) with respect to the fastening portion (71) and to fix the rod-shaped member (11a). It is possible to prevent (l ib) from interfering with each other.

[0043] The external fixator (1) described above is used in the same manner as described in the previous examples. That is, a fracture pin clamp (70) is placed at the position of the wrist joint, and the fracture pin is inserted into the rib bone fragment generated by the fracture and inserted into the fracture pin clamp (70). Fix it. The required number of fracture pins can be inserted into a desired position in the anchoring groove (60a) according to the condition of the fracture.

Note that, for example, a flexible pin may be used for the fracture side pin of the radial side force, but even in this case, the pin inserted obliquely may be bent in the middle and fixed to the insertion groove. it can.

[0044] For the radius (proximal) and phalange (metacarpal) (distal), the proximal pin and distal pin held by the proximal pin clamp (6) and the distal pin clamp (7), respectively Insert a pin and pull the wrist joint Reduce and fix. Approximately 2 to 3 weeks after the external fixator (1) is attached, callus formation at the fracture begins and the bone fragment begins to stabilize, so the distal pin inserted into the phalange (metacarpal bone) , And the distal pin clamp (7) holding the same, the support (9), and the second rod-shaped member (l ib) can be removed.

[0045] In the external fixator (1) according to the present embodiment, the second rod-shaped member (l ib) is positioned at the position of the first rod-shaped member (11a), and the second rod-shaped member (l ib) is positioned at the position of the first rod-shaped member (11a). If the arrangement is changed so that the first rod-shaped member (11a) comes, it can be used for the wrist joint on the opposite side. Thereby, the external fixator (1) according to the present embodiment can be used for both the left and right wrist joints.

[0046] Even with the external fixator (1) according to the present embodiment, the proximal pin, the distal pin, and the fracture pin can be inserted at various angles, so reduction from various directions is possible. Is possible.

In particular, in the external fixator (1) according to the present embodiment, the rod-shaped member is composed of the first rod-shaped member (11a) and the second rod-shaped member (lib), so that after the external fixator (1) is mounted In about 2-3 weeks, the distal pin, distal pin clamp (7), support (9), second rod (l ib) can be removed, and the patient can spend the remaining weeks on the fracture pink Wear only the ramp (70) and the fracture pin fixed to it, the first rod (11a), the support (8), the proximal pin clamp (6) and the proximal pin held by it. This is enough, so there is no trouble.

Industrial applicability

[0047] The present invention solves the problems in the conventional external and external bridge type non-bridge type external fixators, enables early rehabilitation, prevents degenerative arthritic changes, In addition, it provides an external fixator with a simple surgical technique and has industrial applicability.

Claims

The scope of the claims

[1] a proximal pin that can be inserted into the rib,

A distal pin that can be inserted into the phalange (metacarpal bone);

A proximal pin clamp capable of pinching and fixing the proximal pin;

A distal pin clamp capable of pinching and fixing the distal pin;

External fixation characterized in that the distal pin is configured to be removable in the course of treatment

[2] a proximal pin that can be inserted into the rib,

A distal pin that can be inserted into the phalange (metacarpal bone);

A distal pin clamp capable of pinching and fixing the distal pin;

The plate-like member has a protruding portion that is extended and can fix and fix the proximal pin, the distal pin clamp, and a rod-like member that connects and fixes the plate-like member. An external fixator characterized in that the distal pin and the rod-like member are detachable.

[3] The plate-like member is provided with a large number of screw holes or insertion grooves for inserting the fracture portion pins so that a large number of the fracture portion pins can be arranged and fixed.

3. The protruding portion according to claim 2, wherein the protruding portion is provided with a screw hole or an insertion groove for inserting the proximal pin so that the proximal pin can be disposed and fixed. External wound furniture.

[4] The external fixator according to claim 3, wherein a number of screw holes for inserting the fracture pin are provided in the plate-like member, and a proximal pin is inserted in the protruding portion. When providing screw holes,

An external fixator characterized in that the pin heads of the fracture pin and the proximal pin do not protrude from the upper surface of the plate-like member and the protruding part, respectively.

[5] a proximal pin that can be inserted into the radius;

A distal pin that can be inserted into the phalange (metacarpal bone);

A proximal pin clamp capable of holding and fixing the proximal pin;

A distal pin clamp capable of holding and fixing the distal pin;

A number of fracture pin pins, and a fracture pin clamp capable of holding and fixing;

A first rod-like member for connecting the proximal pin clamp and the fracture pin clamp; and a second rod-like member for connecting the distal pin clamp and the fracture pin clamp. An external fixator characterized in that the pin, the distal pin clamp, and the second rod-like member can be removed.

[6] The fracture pin clamp is

A clamping plate disposed to face the arched projecting piece,

A staking groove that allows the fracture pin to pass through is formed between the arch-shaped projecting piece and the clamping plate, and the fracture pin is clamped and fixed in the staking groove. The external fixator according to claim 5, wherein the external fixator is characterized.