JPH0582412U - Guide for iliac artificial bone spacer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a guide for an artificial bone spacer for accurately fitting and easily implanting the iliac bone without wasting the artificial bone spacer. [Structure] A trial fitting portion having substantially the same shape as the artificial bone spacer to be inserted into the iliac defect concave portion, and supporting the trial fitting portion,
An artificial bone spacer guide having a handle portion extending upward from the trial fitting portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a guide for an iliac artificial bone spacer, which is used when implanting an artificial bone spacer into a iliac defect recess.

[0002]

[Prior art and its problems]

 When the hip joint, jawbone, etc. are damaged, a bone fragment excised from the iliac bone 11 (Fig. 7) is transplanted to the damaged part, and the artificial bone spacer is inserted into the defective recessed portion 12 of the iliac bone 11 where the bone fragment was excised. Surgical treatments for transplanting mosquitoes are known. The iliac artificial bone spacer is made of an inorganic material having excellent biocompatibility such as apatite, and has a shape as shown in FIGS. 5 and 6, for example.

The artificial bone spacer 13a in FIG. 5 and the artificial bone spacer 13b in FIG. 6 are both made of an inorganic and porous material such as apatite. Both the upper surface 14a and the lower surface 14b of the artificial bone spacer 13a of FIG. 5 are formed in an R shape, and the upper surface 14a is configured to be along the ridge of the iliac 11. The upper surface 14a is provided with fixing insertion holes 15a communicating with the fixing insertion holes 15b formed at both ends in the longitudinal direction, and the artificial bone spacer 13a is threaded through the fixing insertion holes 15a, 15b. Fixed to the ilium 11 by

Further, both the upper surface 18a and the lower surface 18b of the artificial bone spacer 13b are formed in an R shape, and the upper surface 18a is configured to be along the ridge of the iliac bone 11. The artificial bone spacer 13b has semicircular positioning protrusions 17 formed at both ends in the longitudinal direction, and fixing insertion holes 16 formed on the side surfaces.

In a surgical treatment for implanting such an artificial bone spacer, a portion obtained by excising a bone fragment from the iliac bone is formed into a concave shape that matches the shape of the artificial bone spacer, and the artificial bone spacer is placed in this concave portion. Fit it and fix it to the iliac bone as it is. However, since the concave portion is visually formed by a doctor who treats it, its size and shape may not match those of the artificial bone spacer. In this case, it is necessary to remove the artificial bone spacer once fitted in the recess and replace it with another one.However, blood etc. adheres to the artificial bone spacer once applied to the recess, and especially the artificial bone spacer Often composed of porous materials such as apatite, they are usually not reused for other patients. Therefore, expensive artificial bone spacers must be discarded, which is not economical. Since the artificial bone spacer made of apatite, etc. has a relatively low strength because it is porous, it cannot be pushed hard into the recess or hammered, and the size of the recess is smaller than the outer shape of the artificial bone spacer. Even if it was slightly smaller, the recess had to be remolded.

[0006]

[The purpose of the device]

 The present invention has been made in view of the above problems, and provides a guide for an artificial bone spacer for accurately fitting and easily implanting the iliac bone without wasting the artificial bone spacer. It is an object.

[0007]

[Outline of the device]

 The present invention which achieves the above object, therefore, provides a trial portion having substantially the same shape as the artificial bone spacer to be inserted into the cavities of the iliac bone, and a handle that supports the trial portion and extends upward from the trial portion. It is characterized by having a part.

[0008]

【Example】

 The present invention will be described below with reference to the illustrated embodiments. 1 is a front view of a guide for an iliac artificial bone spacer according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof. The artificial bone spacer guide 20 has a handle portion 21 and a trial fitting portion 22. The handle portion 21 is provided with a non-slip stitch 23 on the surface thereof, is formed so as to be thinner toward the tip, and a male screw 24 is formed at the tip end portion. The trial fitting portion 22 is used to insert the artificial bone spacer into the defect recess 12 of the iliac bone 11 before implanting it and to test whether or not it is suitable for implanting the artificial bone spacer. The artificial bone spacer 13b shown in FIG. 6 has substantially the same shape. The upper surface 26a and the lower surface 26b of the trial fitting portion 22 are formed in an R shape having substantially the same curvature as the artificial bone spacer 13b, and the both ends in the longitudinal direction correspond to the positioning protrusions 17 of the artificial bone spacer 13b. The protrusion 25 is formed. A female screw 27 is formed at the center of the upper surface 26a so that the male screw 24 at the front end of the handle portion 21 can be detachably screwed.

The projection 25 of the trial fitting portion 22 has an overhanging portion 29 having R-shaped portions 25 a and 25 b, and a width slightly narrower than this overhanging portion 29 (see FIG. 3), and extends downward from the overhanging portion 29. It has a downwardly extending portion 30 formed in a protruding manner. Similar to the overhanging portion 29, the downward extending portion 30 has a shape having R-shaped portions 25f, 25c, 25d along the outer edge thereof. Further, the R-shaped portion 25d is smoothly joined to the connecting surface 26c between the main body side of the trial fitting portion 22 and the protrusion 25 via the R-shaped portion 25e. Therefore, the protrusion 25 has an effect of easily expanding the trial recess 22 when the trial fitting portion 22 is hammered into the recess 12 by a hammer.

The handle portion 21 and the trial fitting portion 22 are preferably made of a material such as polytetrafluoroethylene, PMMA (polymethylmethacrylate), stainless steel, titanium and titanium alloy. According to this, the artificial bone spacer guide 20 is made harmless and has biocompatibility, and is dense and has better impact resistance than the artificial bone spacer, and is strongly pushed into the defect recess 12 or is hammered with a hammer. Alternatively, it can be sterilized by boiling and can be repeatedly used.

In this embodiment, the trial fitting portion 22 having the same dimensions as the shape of the artificial bone spacer 13b shown in FIG. 6 is described as a representative, but actually, the trial fitting portion is formed of various artificial bone spacers. A plurality of different shapes corresponding to the shapes are prepared, and the trial fitting portion and the handle portion 21 are configured to be attachable to and removable from each other with a male screw 24 and a female screw 27. Therefore, not only can different trial fitting parts be attached to the same handle portion 21 to be used depending on each situation, but also a plurality of trial fitting portions can be fixed to a plurality of handle portions and used.

The artificial bone spacer guide 20 having the above structure can be used as follows. First, in the case of performing a surgical treatment in which a bone fragment excised from the iliac bone 11 is transplanted to another affected area, the trial fitting portion 22 is inserted into the defective concave portion 12 whose shape is adjusted to some extent after the removal of the bone fragment. At this time, even if the shape of the defective recess 12 is slightly smaller than the trial portion 22, the intestine portion 22 may be hit with a hammer or the trial portion 22 may be rocked back and forth and left and right by holding the handle portion 21. The relatively soft defect 12 of the bone 11 can be widened. The artificial bone spacer 13b inserted into the defect recess 12 from which the trial fit portion 22 is removed is fixed to the ilium 11 by the thread passed through the fixing insertion hole 16.

Although blood or the like is attached to the artificial bone spacer guide 20 that has been removed after being inserted into the defect recess 12, the trial fitting portion 22 is dense, so that blood or the like will enter the interior. It can be safely and repeatedly used by disinfection such as boiling. As a result, economic efficiency is significantly improved.

[0014]

[Effect of the device]

 As described above, according to the present invention, the trial portion of the guide for the artificial bone spacer is inserted into the cut portion of the iliac bone to predict whether the size of the artificial bone spacer is suitable for the cut portion of the bone fragment. Since it is possible to make a decision, it is possible to eliminate the waste of discarding the artificial bone spacer and improve the economical efficiency. Further, when the trial fitting portion and the handle portion are made of any one material of stainless steel, titanium and titanium alloy, the guide for the artificial bone spacer can be firmly formed, so that the iliac defect recess Even if is smaller than the trial fitting part, it is possible to tap the trial fitting part with a hammer or the like to make it easier to make the insertion groove of the artificial bone spacer, or to swing the front and back and left and right while holding the handle part to easily widen the defective recess. it can.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a guide for an iliac artificial bone spacer according to the present invention.

FIG. 2 is a plan view of the artificial bone spacer guide shown in FIG.

3 is a side view of the artificial bone spacer guide shown in FIG. 1. FIG.

FIG. 4 is a view showing the artificial bone spacer guide of FIG. 1 in use.

FIG. 5 is a perspective view showing an example of an artificial bone spacer to be transplanted into a defect recess of the iliac bone.

FIG. 6 is a perspective view showing an artificial bone spacer having a different shape from that of FIG. 5, which is implanted in a defect recess of the iliac bone.

FIG. 7 is a view showing a state in which an artificial bone spacer is transplanted into a cavities of a iliac defect.

[Explanation of symbols]

 11 Iliac 12 Defect Recessed 13a 13b Iliac Artificial Bone Spacer 14a 18a 26a Upper Surface 14b 18b 26b Lower Surface 17 Positioning Protrusion 20 Iliac Artificial Bone Spacer Guide 21 Handle Part 22 Trial Fitting 23 Knit 24 Male Thread 25 Projection 27 Female Thread

Claims (6)

[Scope of utility model registration request] 1. A trial fitting portion having substantially the same shape as that of the artificial bone spacer to be inserted into the cavities of the iliac bone; and a handle portion that supports the trial fitting portion and extends upward from the trial fitting portion. Guide for iliac artificial bone spacer. 2. The guide for an iliac artificial bone spacer according to claim 1, wherein the trial fitting portion and the handle portion are made of any one material of stainless steel, titanium and titanium alloy. 3. The iliac artificial bone spacer guide according to claim 1, wherein the trial fitting portion and the handle portion are made of polytetrafluoroethylene or polymethylmethacrylate. 4. The iliac artificial bone spacer guide according to claim 1, wherein a plurality of trial fitting portions having different shapes are prepared, and the trial fitting portion and the handle portion are configured to be detachable from each other. 5. The guide for an iliac artificial bone spacer according to claim 1, wherein the trial fitting part is formed to be long and has projections at both ends in the longitudinal direction. 6. The projection according to claim 5, wherein the projections at both ends in the longitudinal direction of the trial fitting portion each have an overhanging portion having a curved surface on an outer side surface, and are narrower than the overhanging portion and extend downward of the overhanging portion. A guide for an iliac artificial bone spacer having a formed downwardly extending portion having a curved outer surface.