JP2003180704A - Joining implement for femur - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining implement for a femur constituted so as to make it possible not only to facilitate operation but also to reduce the load of a patient by providing a structure capable of making the joining part of a sleeve and a plate compact. <P>SOLUTION: A locking part 122 on a sleeve side is provided to a sleeve member 120 for housing a shaft-like member 110 and a superposition surface 122P is formed to the outer periphery of the locking part 122 on the sleeve side while a locking recessed part 122a having an inverted taper shape is formed to the inside thereof. The locking part 131 on a fixing side locked with the sleeve member 120 is provided to a fixing member, and a superposition surface 131P formed so as to come into close contact with the superposition surface 122P and the locking projected part 131b corresponding to the a locking recessed part 122a formed to the inside of the superposition surface 131P are provided to the locking part 131 on the fixing side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a femoral joint, and more particularly to the structure of a joint used for a fracture near the femoral head of the femur.

[0002]

2. Description of the Related Art Generally, various connectors are used for repairing a fracture near the head of a femur. These connectors typically have a lag screw that is screwed toward the femoral head, which is introduced into a plate that is fixed on the lateral surface of the femur or into the medulla of the femur. It is adapted to be engaged with and retained by an intramedullary nail or the like.

In many cases, a connector having a plate fixed on the outer surface of the femur has an angle plate integrally provided with a sleeve portion for engaging the lag screw with the end portion of the plate. Have However, to facilitate work during surgery, US Pat. No. 4,443,876.
As described in Japanese Unexamined Patent Publication No. 2 (1994), there is proposed a connector having a structure in which a plate and a sleeve are separately formed and the plate and the sleeve are slidably engaged with each other. As this type of connector, there is also a connector according to Japanese Patent No. 3184718 owned by the present applicant.

In these connectors, since the plate can be engaged with the sleeve after the lag screw is inserted into the sleeve and screwed into the femur, each work is facilitated. There is an advantage that the amount of skin incision can be reduced and the burden on the patient during surgery can be reduced.

On the other hand, as described in US Pat. No. 4,776,330, an angle plate integrally provided with a sleeve portion at an end portion of the plate is slidably engaged with a separate bone plate. It is also known that it is configured to be able to do so. Such a connector is
The length of the angle plate can be made shorter than usual, and it is possible to adjust the length of the plate part, but it is not as surgical as the above-mentioned joint tool in which the sleeve and the plate are configured separately. I can't work easily inside.

[0006]

By the way, in the connector disclosed in the above-mentioned US Pat. No. 4,438,762, a flange portion is provided on the outer peripheral edge of the sleeve, and the flange portion is slid into a groove provided in the frame portion of the plate. The connector disclosed in Japanese Patent No. 3184718 is configured to be engaged with each other, and the joint is provided with a flange portion on the outer peripheral edge of the tip of the plate, and the flange portion is formed in a sleeve. Is configured to be slidably engaged with. Therefore, in any structure, it is inevitably wider than the angle plate, so it is difficult to reduce the size, and it is necessary to provide an engaging structure with a complicated shape having a frame portion having a groove corresponding to the flange portion. Therefore, there is a problem that it is difficult to process the sleeve or the plate.

Further, since the weight of the upper half of the body is concentrated on the head of the femur, it is necessary to secure sufficient engagement strength between the sleeve and the plate. It is difficult to increase the engagement strength in the structure that engages with the frame portion having the corresponding groove, and if the engagement strength is increased, the width and thickness of the portion where the sleeve and the plate overlap each other increase. There is a problem.

Further, in the engagement structure of the flange portion provided on the outer periphery and the frame portion having the groove, the outer surface of the sleeve and the plate overlap with each other in a complicated surface shape at the overlapping portion. Therefore, if a callus is formed around the joint after implantation, the callus easily enters the boundary between the sleeve and the plate on the outer surface, and the joint is removed after the fracture is healed. There is also a problem that it is difficult to remove the joining tool at that time.

Therefore, the present invention is to solve the above-mentioned problems, and the problem is to make the operation of the operation easier and reduce the burden on the patient by making the engaging portion of the sleeve and the plate compact. It is to provide a femoral joint. Another object of the present invention is to provide a femoral connector that can withstand a large external stress by adopting a structure that can easily increase the engagement strength between the sleeve and the plate. Another object of the present invention is to provide a connector that reduces biting of callus and facilitates removal work.

[0010]

In order to solve the above-mentioned problems, a femoral connector of the present invention includes a shaft member embedded in a femoral head and a housing for housing the shaft member so that the shaft member can move forward and backward. A sleeve member provided with a sleeve-side engaging portion provided at one opening edge of the hole and the accommodation hole, and slidably engaged so as to overlap the sleeve-side engaging portion, and the sleeve-side engaging portion A femoral head having a fixed-side engaging portion having an opening facing the accommodation hole in a state of being engaged with the fixing portion and a fixing member having a fixing portion fixed on the outer surface of the femur. It is premised that it is a femoral connector for performing.

In the connector of the present invention, the sleeve-side engaging portion and the fixed-side engaging portion are configured to engage with each other in a state in which they are in close contact with each other at the overlapping surface, and the sleeve member and the fixing member are substantially formed. The structure for mechanically locking is configured inside the overlapping surface.

Further, in another connector of the present invention, the sleeve-side engaging portion and the fixed-side engaging portion are configured to engage with each other in a state in which they are in intimate contact with each other on the overlapping surface. One of the mating portion and the fixed side engaging portion is provided with an engaging convex portion projecting in the thickness direction with respect to the superposing surface inside the superposing surface, and the other is inside the superposing surface. In the above, there is provided an engaging concave portion which is recessed in the thickness direction with respect to the overlapping surface, and the engaging convex portion and the engaging concave portion are fitted to each other, so that the sleeve side engaging portion The fixed side engaging portion is mutually locked in the thickness direction.

According to the present invention, the sleeve side engaging portion and the fixed side are provided more than the conventional structure having the fitting structure of the flange portion projecting at the outer peripheral portion and the frame portion having the groove corresponding to the flange portion. It is possible to reduce the width of the engaging portion.
In addition, the outer surface of the overlapping portion of the sleeve-side engaging portion and the fixed-side engaging portion can be configured to have a simple surface shape, so that the callus and the like are less likely to adhere firmly and the removal work is easy. become. Therefore, the surgery can be performed more easily than the conventional structure, and the burden on the patient can be reduced.

In the present invention, it is preferable that the engaging convex portion and the engaging concave portion have a reverse taper-shaped fitting structure inclined in the thickness direction. By adopting the reverse tapered fitting structure, it becomes easy to increase the engagement strength without increasing the size of the overlapping portion of the sleeve side engaging portion and the fixed side engaging portion.

In the present invention, it is preferable that the outer edge line on the outer surface of the overlapping surface is provided on the outer peripheral portion of the overlapping portion of the sleeve side engaging portion and the fixed side engaging portion. The outer edge line where the overlapping surface appears on the outer surface is
By providing the outer peripheral portion (outer surface portion) of the overlapping portion, the shape of the sleeve-side engaging portion and the fixed-side engaging portion
Since the structure can be simplified, the parts can be easily processed.

In the present invention, it is preferable that outer surfaces of the sleeve-side engaging portion and the fixed-side engaging portion have substantially continuous surface shapes on both sides of an outer edge line on the outer surface of the overlapping surface. . Since the sleeve-side engaging portion and the fixed-side engaging portion are provided with the outer surface having a substantially continuous surface shape on both sides of the outer edge line where the overlapping surface appears on the outer surface, the sleeve-side engaging portion The callus is less likely to enter the boundary between the fixed engagement portion and the fixed side engaging portion, so that the removal operation can be further facilitated.

In the present invention, the sleeve-side engaging portion and the fixed-side engaging portion have the same width, and
It is preferable that they are configured so as to coincide with each other in the width direction in the engaged state. This makes it possible to further reduce the width of the overlapping portion of the sleeve-side engaging portion and the fixed-side engaging portion.

In the present invention, it is preferable that the sleeve-side engaging portion is interposed between the fixed-side engaging portion and the femur in a state of being attached to the femur. As a result, even if the sleeve-side engaging portion of the sleeve member is brought into close contact with the surface of the femur, the fixing member can be slidably engaged with the sleeve member, and the fixing member is slidably engaged with the sleeve member. Since it becomes easy, it becomes possible to perform surgery easily. Moreover, since the fixing member is easily visible when the fixing member is slidably engaged with the sleeve member, the insertion work can be performed more easily and reliably.

In the present invention, it is preferable that a locking structure between the fixed side engaging portion and the sleeve side engaging portion is also formed on the tip side of the fixing member. As a result, the engagement range between the sleeve-side engaging portion and the fixed-side engaging portion can be expanded, so that the engagement strength can be further increased.

In the present invention, at the tip of the fixing member,
It is preferable that an overhanging portion projecting from the sleeve member is provided, and an engaging element for engaging the fixing member with bone is formed on the overhanging portion. According to this means, the fixing member can be engaged with the bone by the engagement element formed in the overhanging portion provided at the distal end of the fixing member, so that a complicated fracture especially at the proximal end of the femur can be prevented. It is possible to cope with various fracture modes such as fixation. Particularly, in the present invention, since the locking structure of the sleeve member and the fixing member is arranged inside the overlapping surface, there is no restriction by the locking structure or the strength of the locking structure is reduced. Instead, it becomes possible to form the overhanging portion on the fixing member, and the degree of freedom of the shape and the overhanging position of the overhanging portion is increased, so that the overhanging portion can be easily formed to fit the bone surface. The engagement element refers to an element that can function to engage the fixing member with the bone, such as an opening (hole) for engaging the bone screw (lag screw) for fixing the bone.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a femoral joint according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a plan view (a) and a side view (b) of an assembled state of a connector 100 according to the present invention, and FIG. 2 shows a plan view (a) and a rear view (b) of a sleeve member 120 and a sleeve. FIG. 3 shows a vertical cross-sectional view (c) of the assembled state of the member 120 and the shaft-shaped member 110, and FIG. 3 shows a plan view (a), a vertical cross-sectional view (b), a bottom view (c), and an engaging portion of the fixing member 130. Thirteen
1 shows a sectional view (d) and a front view (e) of FIG.

As shown in FIG. 1, the connector 100 has a shaft member 110, a sleeve member 120, and a fixing member 130.
Have and. As shown in FIG. 2C, the shaft-shaped member 110 includes a shaft portion 111, a screw portion 112 provided at the tip of the shaft portion 111, and a head 113 provided at the base end of the shaft portion 111.
And a lag screw having Shaft member 11
A shaft hole 110a penetrating in the axial direction is provided inside 0. The head 113 has a slightly larger outer diameter than the shaft 111. An engaging hole 113a for engaging a tool is provided at the end of the head 113.

As shown in FIGS. 2A and 2B, the sleeve member 120 has a tubular portion 121 and a sleeve side engaging portion 122. The cylindrical member 121 has a shaft-shaped member 110.
An accommodation hole 121a is formed so as to be slidably and rotatably accommodated therein. The shaft-shaped member 1 is attached to the tip of the tubular portion 121.
An opening edge portion 121b having a slightly smaller diameter is provided so that the head portion 113 of 10 cannot pass through. The sleeve side engaging portion 122 has an engaging concave portion 12 opened upward.
2a is formed, and the accommodation hole 121a is opened in the engagement recess 122a.

The engaging portion 122 of the sleeve member 120 has an outer peripheral portion 122b formed around the engaging concave portion 122a,
It has the bottom face part 122c which comprises the bottom face of the engagement recessed part 122a. The outer peripheral portion 122b has a fixing member 13 described later.
It is configured so as to surround the engagement concave portion 122a except for the opening portion into which 0 is inserted. The upper surface of the outer peripheral portion 122b constitutes an overlapping surface 122P for a fixing member described later. Therefore, the engagement recess 122a is formed inside the overlapping surface 122P. In the example shown,
The outer peripheral portion 122b is formed in a planar U shape.

Further, as shown in FIG. 2B, the engaging concave portion 122a has a shape corresponding to the engaging convex portion 131b, which will be described in detail later, and the inner side thereof (the lower portion in the drawing). ) Has a reverse taper shape that spreads in a plane as it goes to. The cross-sectional shape of the fixing member 130 shown in FIG. 2B shows only the fitting shape (cross-sectional outer shape) of the sleeve member 120 with the engaging portion 122, and an opening and the like described later are omitted. It is drawn.

As shown in FIG. 3, the fixing member 130 has a band shape as a whole. The fixed member 130 includes a fixed side engaging portion 131 to be engaged with the sleeve side engaging portion 122 of the sleeve member 120, and the fixed side engaging portion 131.
And a fixing portion 132 formed so as to extend in the axial direction. The fixed side engagement portion 131 is provided with the accommodation hole 121a through the engagement concave portion 122a of the sleeve member 120.
And an opening 131a configured to communicate with. Further, on the bottom of the fixed side engaging portion 131, an engaging convex portion 131b protruding toward the side engaging with the sleeve member 120 is provided.

The fixed side engaging portion 131 has an engaging convex portion 131b.
The peripheral portion of the above is configured so as to project to the outer peripheral side, and the lower surface of this projecting portion serves as an overlapping surface 131P with respect to the sleeve side engaging portion 122. Therefore, the engagement protrusion 131b is formed inside the overlapping surface 131P. The overlapping surface 131P and the overlapping surface 122P of the sleeve side engaging portion 122 are configured to be in close contact with each other when both engaging portions are in a properly engaged state. The engagement protrusion 131b is U-shaped in a plan view corresponding to the engagement recess 122a.
Further, as shown in FIGS. 3D and 3E, the engagement protrusion 131b is formed by sliding the fixing member 130 in the axial direction so that the engagement recess 12 of the sleeve member 120 can be formed.
The taper 2a has an inverse taper shape that spreads in a plane as it extends in the protruding direction (downward in the drawing) so as to fit almost exactly into the 2a.

The fixing portion 132 is provided with a fixing hole 132a for fixing to the bone using a fixing screw or the like. The plurality of fixing holes 132a are arranged along the axial direction of the fixing member 130. The bottom surface of the fixing portion 132 has a shape suitable for direct contact with the bone, for example, curved in a direction orthogonal to the axial direction that matches the outer surface of the tubular bone (femur) extending in the axial direction as shown in the example. It has a concave shape. The fixed portion 132 is configured to be thicker than the fixed side engaging portion 131 and has a step between the bottom surface of the fixed side engaging portion 131 and the bottom surface of the fixed portion 132 (of the sleeve side engaging portion 122 of the sleeve member 120). A step corresponding to the thickness) is provided.

Next, an outline of a surgical method for performing fracture treatment of the femur using the above-described joint 100 will be described. First, the skin on the side of the femur is incised, and the fractured part of the femur is roughly reduced, then the guide pin is pierced at the position below the greater trochanter of the femur, and the guide pin is inserted using a rotary tool. The tip of the guide pin is made to reach the inside of the bone head by a method such as rotation. The state of insertion of the guide pin into the femur is confirmed by an X-ray monitor or the like. This X-ray monitoring device is used for the shaft-shaped member 11 during the subsequent operation.
It is also used as appropriate to see the screwed state of 0.

Then, using a drilling tool such as a reamer drill having a guide pin shaft hole, a hole is bored toward the inside of the bone head according to the guide of the guide pin. Next, the shaft member 110 is inserted into the sleeve member 120, and the shaft member 110 is screwed into the hole of the femur. At this time, with the guide pin inserted in the shaft hole 110a of the shaft-shaped member 110, the shaft-shaped member 110 is screwed into the femur according to the guide of the guide pin.

When the shaft member 110 is sufficiently screwed into the femur and the screw portion 112 of the shaft member 110 is firmly fixed in the head of the bone, the cylindrical portion 12 of the sleeve member 120 is formed.
1 is introduced into the hole of the femur, and the sleeve side engaging portion 122 is arranged on the outer surface of the femur. And the fixing member 13
The fixed side engaging portion 131 of 0 is slidably engaged with the sleeve side engaging portion 122 along the outer surface of the femur, and the fixing member 130 is engaged with the sleeve member 120. Thereafter, a fixing screw is inserted into the fixing hole 132a and screwed into the femur to fix the fixing member 130 on the outer surface of the femur.

In the state where the connector 100 is attached to the femur as described above, as shown in FIG. 1, the sleeve side engaging portion 1
22 and the fixed side engaging portion 131 are in a state of overlapping each other. In the present embodiment, both the engaging portions 122 and 131
In the overlapping portion of the above, the engaging convex portion 131b protrudes in the thickness direction and the engaging concave portion 122a has the same thickness inside the overlapping surfaces 122P and 131P which overlap each other on the outer peripheral side. It has a structure in which the engaging protrusion and the engaging recess are fitted in the thickness direction. Therefore, it is not necessary to form an engagement structure (that is, a structure in which the flange portion and the groove of the frame portion are protruded to the outer peripheral side as in the related art) (that is, a structure fitted in the plane direction), so that the sleeve side engagement portion 122 and The width of the fixed side engaging portion 131 can be reduced. In particular,
In the case of the present embodiment, the sleeve side engaging portion 122 and the fixed side engaging portion 131 are formed to have the same width, and have a structure in which they are exactly overlapped with each other. Can be configured.

Further, in this embodiment, the engaging projection 131b protruding in the thickness direction and the engaging recess 122a corresponding thereto are formed.
The sleeve member 120 and the fixing member 1 according to the fitting structure of
Since 30 is engaged, the sleeve side engaging portion 122
And the fixed side engaging portion 131 on the outer surface (exposed on the outer surface), that is, the overlapping surface 122.
An outer edge line 100P on the outer surface of P, 131P (FIG. 1 (b))
(Refer to FIG. 3) can be configured at any position, and further, the outer surface structure of both engaging portions near the outer edge line 100P can be configured arbitrarily. Specifically, in the present embodiment, the outer edge line 100P has the sleeve side engaging portion 122.
And the fixed side engaging portion 131 are formed on the outer peripheral portion (outer side surface) of the overlapping portion. Also, this outer edge line 100
The outer surfaces of both engaging portions 122 and 131 with P therebetween are configured so as to have mutually continuous surface shapes. Therefore, even if the callus adheres to both the engaging portions with the passage of time after being embedded in the body as described above, the outer edge line 100P
Since the callus is not formed so as to bite in the vicinity of, the connector 100 can be easily removed at a later date.

Further, in this embodiment, at the overlapping portion of the sleeve side engaging portion 122 and the fixed side engaging portion 131, the engaging convex portion protruding in the thickness direction inside the overlapping surfaces 122P and 131P and the engaging convex portion are formed. The sleeve member 120 and the fixing member 130 by the fitting structure with the engaging recess corresponding to
Since it is not necessary to project the portion that contributes to the engagement to the outer peripheral side unlike the conventional structure, the thickness of the overlapping portion itself contributes to the rigidity of the engagement structure. Therefore, the rigidity of the engaging structure (engaging convex portion and engaging concave portion) can be easily increased.

In this embodiment, the engaging protrusion 131b
Since the engagement concave portion 122a and the engagement concave portion 122a are fitted to each other by the inverse tapered inclined surface, the sleeve member 120 and the fixing member 130 are locked in the thickness direction. Further, the sleeve member 120 and the fixing member 130 are also locked to each other in the direction orthogonal to the sliding direction by the above-described inverse tapered fitting structure. Therefore, by fixing the fixing member 130 to the femur, the sleeve member 120 and the fixing member 13 are fixed.
0 is fixed to each other. The engagement structure using the reverse taper-shaped inclined surface can increase the rigidity (engagement strength) of the locking structure as compared with the engagement structure having the flange and the groove of the conventional structure. Particularly, in the present embodiment, the engaging protrusion 1
The reverse taper-shaped inclined surface of 31 b and the reverse taper-shaped inclined surface of the engaging recess 122 a are the fixing portions 132 of the fixing member 130.
The fixing member 130 is inserted to the deepest part of the engaging portion 122 because it is configured to surround the accommodation hole 121a and the opening 131a except the side (in the illustrated example, configured to have a U-shape in plan view). By doing so, the engaging protrusion 131b and the engaging recess 122a are provided on all sides other than the fixed portion 132 side.
Can be engaged, that is, the fixing member 1
Since the locking structure is provided also on the tip side of 30, the engagement strength is further improved.

Next, another connector 200 according to the present invention will be described with reference to FIG. In this connector 200, as shown in FIG. 4C, the same shaft portion 2 as described above is used.
Shaft-shaped member 2 provided with 11, screw part 212 and head part 213
10, a sleeve member 220 including a tubular portion 221 and a sleeve side engaging portion 222 similar to the above, and a fixing member 23 that engages with the sleeve member 220 in the same manner as above.
Has 0 and.

The fixing member 230 of this embodiment has a structure shown in FIG.
As shown in (a) and (b), a fixed side engaging portion 231 and a fixing portion 232 similar to those described above are provided, but the tip of the fixed side engaging portion 231 is opposite to the fixed portion 232. The protruding portion 233 is formed on the side. Overhang 233
Is configured to project from the sleeve member 220 at the tip of the fixing member 230. The projecting portion 233 has a sub-opening portion 233a having an axis line that is substantially parallel to the same opening portion 231a provided in the fixed side engaging portion 231 as described above.
Are formed. In addition, the surface of the overhanging portion 233 facing the bone should be in close contact with the surface of the proximal end of the femur.
It has a curved shape corresponding to the surface of the femur.

In the present embodiment, the above-described joining tool 10 is used.
In a state and procedure similar to 0, it is attached to the femur as shown in FIG. At this time, a shaft-shaped member 240 such as a bone screw different from the shaft-shaped member 210 is inserted into the opening 233a provided in the projecting portion 233, and the head 240 thereof.
a becomes engaged with the opening 233a,
The axial member 240 can be made to function to hold the fractured portion of the femur near the head of the femur. That is, in the illustrated example, the fixing member 230 has the fixing hole 232a in which the head portion 2 is inserted.
35a is fixed by the fixing screw 235 engaged with the shaft-shaped member 210 held by the sleeve member 220 locked by the fixed fixing member 230, and the protruding portion 2
The fractured portion of the femoral head of the femur is held and fixed by the shaft-shaped member 240 with which the head 240a is engaged with the opening 233a of 33.

In the present embodiment, the sleeve member and the fixing member are locked by the concave-convex fitting structure in the thickness direction provided inside the overlapping surface, not by the flange-groove engaging structure of the conventional structure. Therefore, it is possible to provide an overhanging portion having a free shape at the tip of the engaging portion of the fixing member, and it is possible to easily configure a structure such as the connector 200 shown in FIG. 4.

The joining tool of the present invention is not limited to the above-mentioned illustrated examples, and it goes without saying that various modifications can be made without departing from the scope of the present invention.
For example, in the above-described embodiment, the sleeve member is provided with the engaging concave portion and the fixing member is provided with the engaging convex portion. On the contrary, as shown in FIG. The engaging projection 122a 'may be provided on the joining portion 122', and the engaging recess 131b 'may be provided on the engaging portion 131 of the fixed member. In addition, 121 'is a cylindrical portion of the sleeve member,
a'is a housing hole.

Further, in the above-mentioned embodiment, the structure in which the inverted taper-shaped inclined surfaces are fitted to each other is used as the engaging structure, but unlike this, for example, as shown in FIG. The engaging protrusion 13 is provided inside the overlapping portion of the engaging portion 122 ″ of the member and the engaging portion 131 ″ of the fixed member.
It is also possible to provide a flange portion projecting to the outer peripheral side on the outer periphery of 1b ″ and a groove on the inner periphery of the engaging recess 122a ″ so that the flange portion and the groove are fitted together. In addition, 121 "
Is a cylindrical portion of the sleeve member, and 121a ″ is a housing hole.

Further, although the attached drawings show an example in which the shaft-shaped member is constituted by a lag screw, the shaft-shaped member of the present invention is not limited to a screw, but the tip of the shaft-shaped member can be enlarged. Alternatively, the shaft-shaped member may be inserted into the bone and then the tip end thereof may be enlarged to be engaged with the bone.

[0043]

As described above, according to the present invention,
For example, the width of the engagement portion between the sleeve member and the fixing member can be reduced, and thus the operation can be easily performed.

[Brief description of drawings]

FIG. 1 is an assembly plan view (a) and an assembly side view (b) showing a structure of an embodiment of a femoral connector according to the present invention.

FIG. 2 is a plan view (a) and a rear view (b) of the sleeve member in the same embodiment, and an assembled sectional view (c) of the sleeve member and the shaft-shaped member.

FIG. 3 is a plan view (a), a vertical sectional view (b), a bottom view (c), and a plan view (a) of the fixing member in the same embodiment.
FIG. 6 is a cross-sectional view (d) and a front view (e) showing a state of cutting along the line D-D.

FIG. 4 is a side view (a) and a plan view (b) of a fixing member in a connector according to a different embodiment, and a cross-sectional view (c) showing a state of attachment to a femur.

FIG. 5 shows another different structural example (D- in FIG. 3).
It is sectional drawing (a) and (b) which shows the state which cut | disconnected the assembly tool in the assembly state in the part corresponded to D line.

[Explanation of symbols]

100, 200 ... Joining tool, 110, 120 ... Shaft member, 120, 220 ... Sleeve member, 121,
221 ... Cylindrical part, 121a ... Housing hole, 122,
222 ... engaging portion, 122a ... engaging concave portion, 13
0,230 ... Fixing member, 131,231 ... engaging portion, 131a ... opening portion, 131b ... engaging convex portion,
132, 232 ... Fixed part, 233 ... Overhang part

Claims (9)

[Claims] 1. A shaft-shaped member embedded in a femoral head,
A sleeve member having a housing hole for housing the shaft member so as to be able to move forward and backward, and a sleeve side engaging portion provided at one opening edge of the housing hole, and a slide member so as to overlap the sleeve side engaging portion. Fixation including a fixed-side engaging portion that is freely engaged and has an opening facing the accommodation hole in a state of being engaged with the sleeve-side engaging portion, and a fixing portion that is fixed on the outer surface of the femur. And a member for joining the femoral head to the femur, wherein the sleeve-side engaging portion and the fixed-side engaging portion are engaged with each other in a state of being in close contact with each other on the overlapping surface. And a structure for substantially locking the sleeve member and the fixing member on the inside of the overlapping surface. 2. A shaft-shaped member embedded in the femoral head,
A sleeve member having a housing hole for housing the shaft member so as to be able to move forward and backward, and a sleeve side engaging portion provided at one opening edge of the housing hole, and a slide member so as to overlap the sleeve side engaging portion. Fixation including a fixed-side engaging portion that is freely engaged and has an opening facing the accommodation hole in a state of being engaged with the sleeve-side engaging portion, and a fixing portion that is fixed on the outer surface of the femur. And a member for joining the femoral head to the femur, wherein the sleeve-side engaging portion and the fixed-side engaging portion are engaged with each other in a state of being in close contact with each other on the overlapping surface. The sleeve-side engaging portion and the fixed-side engaging portion are each provided with an engaging protrusion that protrudes in the thickness direction with respect to the overlapping surface inside the overlapping surface. On the other hand, inside the superposed surface, in front of the superposed surface An engagement recess recessed in the thickness direction is provided, and the engagement protrusion and the engagement recess are fitted to each other, whereby the sleeve-side engagement portion and the fixed-side engagement portion are separated from each other. A femoral joint which is mutually locked in the thickness direction. 3. The femoral joint according to claim 2, wherein the engaging convex portion and the engaging concave portion have an inverse tapered shape fitting structure inclined in the thickness direction. . 4. The outer edge line on the outer surface of the overlapping surface is
The joint of the femur according to any one of claims 1 to 3, wherein the sleeve-side engaging portion and the fixed-side engaging portion are provided on an outer peripheral portion of an overlapping portion. Ingredient 5. The outer surfaces of the sleeve-side engaging portion and the fixed-side engaging portion have substantially continuous surface shapes on both sides of an outer edge line on the outer surface of the overlapping surface. The femoral connector according to any one of claims 1 to 4. 6. The sleeve-side engaging portion and the fixed-side engaging portion are configured to have the same width, and are configured so as to coincide with each other in the width direction in the engaged state. The femoral connector according to any one of claims 1 to 5. 7. The sleeve-side engagement portion is configured to be interposed between the fixed-side engagement portion and the femur in a state of being attached to the femur. Item 6. The femoral connector according to any one of items 5. 8. The locking structure between the fixed-side engaging portion and the sleeve-side engaging portion is formed on the tip side of the fixing member as well.
The femoral joint according to any one of 1. 9. A protruding portion that extends from the sleeve member is provided at the tip of the fixing member, and an engaging element that engages the fixing member with bone is formed in the protruding portion. The femoral joint according to any one of claims 1 to 8, wherein the joint is a femur.