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CN-224210534-U - Forming tool for bone fracture plate

CN224210534UCN 224210534 UCN224210534 UCN 224210534UCN-224210534-U

Abstract

The utility model provides a forming tool for a bone plate, which can easily give a desired crank shape to the bone plate. The bone plate forming tool includes a first mold, a second mold, a first bracket portion, a second bracket portion, a cylindrical portion, and a link portion. The first pattern has N (where N≥2) first step surfaces forming step shapes different from each other. The second model has N second step faces corresponding to the N first step faces. The first holder holds the first mold slidably in a first direction. The second holder holds the second mold slidably in the first direction. If the link portion slides within the cylindrical portion so that the first bracket portion and the second bracket portion are relatively close, the first model and the second model clamp the bone plate between a kth first step surface and a second step surface corresponding to the kth first step surface.

Inventors

  • HIRAOKA CHIEMI
  • MINAMIYAMA ASUKA
  • TIAN ZHONGJUN

Assignees

  • 郡是株式会社

Dates

Publication Date
20260508
Application Date
20250521
Priority Date
20240606

Claims (15)

  1. 1. A molding tool for a bone plate for imparting a crank shape to a bone plate made of a thermoplastic resin, comprising: a first model having N first step surfaces forming different step shapes from each other, wherein N is not less than 2; A second model having N second step surfaces forming a step shape corresponding to the N first step surfaces; A first holder portion for holding the first model; A second holder portion having a first wall and a second wall disposed apart from the first wall by a predetermined interval, the second holder portion holding the second mold to the second wall so that the N second steps face the first wall side, the first holder portion being positioned between the second mold and the first wall so that the N first steps face the second wall side; A tubular portion having one end portion fixed to the second bracket portion and extending from the first wall in a direction opposite to the second wall, and a finger hooking portion formed at the other end portion for hooking a finger, and A link portion having one end connected to the first bracket portion and the other end formed with a grip portion to be gripped by a hand, the link portion having a rod-shaped intermediate portion extending coaxially with the cylindrical portion between the first bracket portion and the grip portion and penetrating the cylindrical portion and the first wall, The N first step surfaces are arranged in sequence from the first step surface to the Nth first step surface along the first direction, The N second step surfaces are arranged in order from the first second step surface to the nth second step surface along the first direction, The first mold is held slidably in the first direction with respect to the first holder portion, The second mold is held slidably in the first direction with respect to the second holder portion, When the finger is hooked by the finger hooking portion and the grip portion is gripped, the link portion slides in the cylindrical portion, and the first bracket portion and the second bracket portion are relatively moved closer together, the first model and the second model clamp the bone plate between a kth first step surface and a second step surface corresponding to the kth first step surface, and a predetermined crank shape is given to the bone plate, wherein k=1.
  2. 2. The bone plate forming tool of claim 1 wherein, The kth first step surface extends between a first base end portion extending along the first direction and a first terminal end portion extending parallel to the first base end portion, The first mould has at least one first projection from the first terminal end towards the second wall, The first projection projects closer to the second wall than any portion of the kth first step surface, positioning the bone plate relative to the kth first step surface by contact with an end of the bone plate clamped between the first and second models.
  3. 3. The bone plate forming tool according to claim 1 or 2, wherein, An m-th second step surface extends between a second base end portion extending along the first direction and a second terminal end portion extending parallel to the second base end portion, wherein m=1, a.n, The second mould has at least one second projection from the second terminal end towards the first wall, The second projection projects closer to the first wall than any portion of the mth second step surface, positioning the bone plate relative to the mth second step surface by contact with an end of the bone plate clamped between the first and second models.
  4. 4. The bone plate forming tool according to claim 1 or 2, wherein, The N first step surfaces extend between a first base end portion extending in the first direction and a first terminal end portion extending in parallel with the first base end portion, respectively, and each have: A first inclined surface extending from the first base end portion, inclined so as to approach the second wall toward the first terminal end portion, and extending to a first virtual line parallel to the first direction; a second inclined surface extending from the first terminal portion, inclined away from the second wall toward the first base end portion, and extending to a second imaginary line parallel to the first direction, and A first intermediate plane extends between the first imaginary line and the second imaginary line.
  5. 5. The bone plate forming tool of claim 4, wherein at least one of an angle between the first inclined surface and the first intermediate surface and an angle between the first intermediate surface and the second inclined surface is an acute angle.
  6. 6. The bone plate forming tool of claim 4, wherein the greater k is the longer or the shorter the distance between the first imaginary line and the second imaginary line in the kth first step surface.
  7. 7. The bone plate forming tool according to claim 1 or 2, wherein, The N second step surfaces extend between a second base end portion extending along the first direction and a second terminal portion extending parallel to the second base end portion, respectively, and each have: A third inclined surface extending from the second base end portion, inclined so as to approach the second wall toward the second terminal end portion, and extending to a third virtual line parallel to the first direction; A fourth inclined surface extending from the second terminal portion, inclined away from the second wall toward the second base end portion, and extending to a fourth imaginary line parallel to the first direction, and A second intermediate plane extends between the third imaginary line and the fourth imaginary line.
  8. 8. The bone plate forming tool of claim 7, wherein at least one of an angle between the third inclined surface and the second intermediate surface and an angle between the second intermediate surface and the fourth inclined surface is an acute angle.
  9. 9. The bone plate forming tool of claim 7, wherein the greater m is the longer or shorter the distance between the third imaginary line and the fourth imaginary line in the mth second step surface, wherein m = 1.
  10. 10. The bone plate forming tool according to claim 1 or 2, wherein the link portion is detachably connected with respect to the first bracket portion.
  11. 11. The bone plate forming tool according to claim 1 or 2, wherein a central axis of the cylindrical portion, a central portion of the first bracket portion, and a central portion of the second wall of the second bracket portion are aligned with each other.
  12. 12. The bone plate forming tool of claim 11, wherein the first mold and the first bracket portion form a locking mechanism that locks a kth first step surface in a state of being aligned with the central axis, wherein k = 1.
  13. 13. The bone plate forming tool according to claim 11, wherein the second mold and the second bracket portion form a locking mechanism that locks an mth second step surface in a state of being aligned with the central axis, wherein m=1.
  14. 14. The bone plate forming tool according to claim 1 or 2, wherein the tubular portion has a through hole formed therethrough from an outer peripheral surface to an inner peripheral surface.
  15. 15. The bone plate forming tool according to claim 1 or 2, wherein the link portion has an elastic member disposed between the grip portion and the finger portion, the elastic member biasing the grip portion in a direction away from the finger portion.

Description

Forming tool for bone fracture plate Technical Field The present disclosure relates to a forming tool for imparting a crank shape to a bone plate. Background Patent document 1 discloses a bending jig for a bone plate, which can simply bend a bone plate made of a thermoplastic resin to a predetermined angle. Bone plates are medical devices, typically biodegradable, that are fixed to bone and embedded in the body in order to join the bone to each other at a fracture site or fracture site. The bone plate needs to be shaped into the proper shape by the medical practitioner prior to fixation to the bone. The bending jig disclosed in patent document 1 includes a jig main body having a plate holding portion for holding the bone plate and a groove portion into which the bone plate held in the plate holding portion protrudes, and a pusher inserted into the groove portion from an end of the groove portion. The clipper is inserted into the slot part when the bone plate is in a softened state, and the part of the bone plate protruding into the slot part is bent to a prescribed angle along the side surface of the slot part. Prior art literature Patent document 1 Japanese patent application laid-open No. 2009-082344 The bone plate described above is also shaped in the form of a crank. The crank shape is a shape in which a planar bone plate is concavely folded (or convexly folded) along a first imaginary line, and the same bone plate is further convexly folded (or concavely folded) along a second imaginary line parallel to the first imaginary line. The bone plate formed in a crank shape includes a first portion including one end of the original plate, a second portion including the other end of the original plate, and a third portion angled with respect to the first and second portions. Such bone plates are typically fixed to bone in a first portion and a second portion. Therefore, it is important to adjust the length of the third portion as precisely as possible in accordance with the portion to which the bone plate is applied. According to patent document 1, a crank shape can be imparted to a bone plate by a bending jig including a jig main body having a first groove portion into which one end side of the bone plate protrudes and a second groove portion into which the other end side thereof protrudes, and a first pusher and a second pusher inserted into the groove portions. However, the first clipper and the second clipper must be inserted into the respective grooves in the directions opposite to each other, so that the operation is not easy. In addition, in the event that the relative forces of the first and second clippers inserted are improperly adjusted, it may not be possible to bend the bone plate at the desired location. Accordingly, there is still a need for a technique that can easily impart a desired crank shape. Disclosure of utility model It is an object of the present disclosure to provide a bone plate forming tool that can easily impart a desired crank shape to a bone plate. The molding tool for a bone plate according to the first aspect of the present disclosure is for imparting a crank shape to a bone plate made of a thermoplastic resin, and includes a first mold, a second mold, a first bracket portion, a second bracket portion, a cylindrical portion, and a link portion. The first mold has N first step surfaces forming step shapes different from each other, wherein N is not less than 2. The second mold has N second step surfaces forming a step shape corresponding to the N first step surfaces. The first holder portion holds the first mold. The second holder portion has a first wall and a second wall disposed at a predetermined interval from the first wall, holds the second mold to the second wall so that the N second steps face the first wall side, and positions the first holder portion between the second mold and the first wall so that the N first steps face the second wall side. The tubular portion is a hollow tubular portion having one end portion fixed to the second bracket portion and extending from the first wall in a direction opposite to the second wall, and a finger hooking portion for hooking a finger is formed at the other end portion. One end of the link portion is connected to the first bracket portion, and a grip portion to be gripped by a hand is formed at the other end, and the link portion has a rod-shaped intermediate portion extending coaxially with the cylindrical portion between the first bracket portion and the grip portion and penetrating the cylindrical portion and the first wall. The N first step surfaces are arranged in order from the first step surface to the Nth first step surface along the first direction. The N second step surfaces are arranged in order from the first second step surface to the nth second step surface along the first direction. The first mold is held slidably in the first direction with respect to the first holder portion, and the second mold is held slidably