Forming tool for bone fracture plate

Abstract

The utility model provides a forming tool for a bone fracture plate, which can easily endow the bone fracture plate with an expected crank shape. A forming tool for a bone plate is provided with a first mold, a second mold, a first stent part, a second stent part, a cylindrical part, and a link part. The first model has N (where N > = 2) first stepped surfaces forming different stepped shapes from each other. The second model is provided with N second step surfaces corresponding to the N first step surfaces. The first holder portion holds the first model so as to be slidable in a first direction. The second holder portion holds the second model so as to be slidable in the first direction. And if the connecting rod part slides in the cylindrical part so that the first bracket part and the second bracket part are relatively close to each other, the first model and the second model clamp the bone fracture plate between a kth first step surface and a second step surface corresponding to the kth first step surface.

Description

Technical Field

[0001] This disclosure relates to a forming tool for giving a crank shape to a mating bone plate. Background Technology

[0002] Patent Document 1 discloses a bending clamp for bone plates that can be easily bent to a predetermined angle. Bone plates are medical devices used to fix bones to each other at fracture sites or bone cracks and are typically biodegradable. Before being fixed to the bone, the bone plate needs to be shaped into a suitable form by a medical practitioner. The bending clamp disclosed in Patent Document 1 includes: a clamp body having a plate holding portion for holding the bone plate and a groove into which the bone plate protrudes, held in the plate holding portion; and a pusher inserted into the groove from its end. The pusher is inserted into the groove when the bone plate is in a softened state, bending the portion of the bone plate protruding into the groove along the side of the groove to a predetermined angle.

[0003] Existing technical documents

[0004] Patent Document 1: Japanese Patent Application Publication No. 2009-082344

[0005] The aforementioned bone plates are also sometimes shaped like cranks. A crank shape refers to a shape in which a planar bone plate is folded concave (or convex) along a first imaginary line, and the same bone plate is further folded convex (or concave) along a second imaginary line parallel to the first imaginary line. A bone plate shaped like a crank includes: a first portion containing one end of the original plate; a second portion containing the other end of the original plate; and a third portion forming an angle with respect to the first and second portions. Typically, the first and second portions of this type of bone plate are fixed to the bone. Therefore, it is important to adjust the length of the third portion, etc., as precisely as possible, according to the location where the bone plate is applied. According to Patent Document 1, a bending clamp can be used to give a bone plate a crank shape. The bending clamp includes: a clamp body, a first groove on both sides of the plate holding portion for one end of the bone plate to protrude into, and a second groove for the other end to protrude into; and a first pusher and a second pusher inserted into the grooves. However, the first and second pushers must be inserted into the grooves in opposite directions, making operation difficult. Furthermore, if the relative forces used to insert the first and second pushers are not properly adjusted, the bone plate may not be able to bend in the desired position. Therefore, a technique that can easily impart the desired crank shape remains needed. Utility Model Content

[0006] The purpose of this disclosure is to provide a forming tool for bone plates that can easily align bone plates to give them the desired crank shape.

[0007] The first aspect of this disclosure discloses a forming tool for giving a bone plate made of thermoplastic resin a crank shape, comprising a first model, a second model, a first support portion, a second support portion, a cylindrical portion, and a connecting rod portion. The first model has N first step surfaces forming different step shapes from each other, wherein N ≥ 2. The second model has N second step surfaces forming step shapes corresponding to the N first step surfaces. The first support portion holds the first model. The second support portion has a first wall and a second wall disposed at predetermined intervals from the first wall, holding the second model against the second wall such that the N second step surfaces face the first wall side, and positioning the first support portion between the second model and the first wall such that the N first step surfaces face the second wall side. The cylindrical portion is a hollow cylindrical portion with one end fixed to the second support portion and extending from the first wall in the opposite direction to the second wall, and having a hook portion for hooking a finger at the other end. One end of the connecting rod is connected to the first support portion, and the other end forms a handle portion for gripping. The connecting rod portion has a rod-shaped intermediate portion that extends coaxially with the cylindrical portion and penetrates the cylindrical portion and the first wall between the first support portion and the handle portion. The N first step surfaces are arranged sequentially along a first direction from the first first step surface to the Nth first step surface. The N second step surfaces are arranged sequentially along the first direction from the first second step surface to the Nth second step surface. The first model is held so that it can slide relative to the first support portion in the first direction, and the second model is held so that it can slide relative to the second support portion in the first direction. If a finger is hooked on the hook portion and the handle portion is gripped, the connecting rod portion slides within the cylindrical portion, thereby bringing the first support portion and the second support portion closer together. The first model and the second model clamp the bone plate between the kth first step surface and the second step surface corresponding to the kth first step surface, giving the bone plate a predetermined crank shape, where k = 1, ..., N.

[0008] Following the above method, the step surface corresponding to the desired crank shape can be easily aligned and selected from the N first step surfaces and N second step surfaces of the first and second models by sliding movement. Therefore, the work of preparing, disassembling, or replacing the molding model to match the desired crank shape is eliminated, and the desired crank shape can be quickly assigned. Furthermore, since the joint plate is clamped between the first and second models using the hook and grip parts, the operation of assigning the crank shape can be performed with one hand, so it is easy to assign crank shapes that are difficult to form to the joint plate.

[0009] The second aspect of the bone plate forming tool disclosed herein, in the first aspect of the bone plate forming tool, wherein the kth first step surface extends between a first base end extending along the first direction and a first terminal portion extending parallel to the first base end, the first model having at least one first protrusion projecting from the first terminal portion toward the second wall, the first protrusion projecting in such a manner that it is closer to the second wall than any part of the kth first step surface, the bone plate being positioned relative to the kth first step surface by contacting the end of the bone plate held between the first model and the second model.

[0010] The third-party forming tool for bone plates disclosed herein, in a first or second type of forming tool for bone plates, has an m-th second step surface extending between a second base end portion extending along the first direction and a second terminal portion extending parallel to the second base end portion, wherein m = 1, ..., N, and the second model has at least one second protrusion projecting from the second terminal portion toward the first wall, the second protrusion projecting in such a manner that it is closer to the first wall than any part of the m-th second step surface, and the bone plate is positioned relative to the m-th second step surface by contacting the end of the bone plate held between the first model and the second model.

[0011] According to the second and third methods, there is no need to prepare additional measuring instruments, etc., and the connecting plate can be given a crank shape in the appropriate position.

[0012] The bone plate forming tool of the fourth aspect of this disclosure, in any one of the bone plate forming tools of the first to third aspects, wherein the N first stepped surfaces extend between a first base end extending along the first direction and a first terminal portion extending parallel to the first base end, and each has: a first inclined surface extending from the first base end, inclined toward the second wall as it moves toward the first terminal portion, and extending to a first imaginary line parallel to the first direction; a second inclined surface extending from the first terminal portion, inclined away from the second wall as it moves toward the first base end, and extending to a second imaginary line parallel to the first direction; and a first intermediate surface extending between the first imaginary line and the second imaginary line.

[0013] In the fifth embodiment of the bone plate forming tool disclosed herein, in any one of the first to fourth embodiments of the bone plate forming tool, at least one of the angle between the first inclined surface and the first intermediate surface and the angle between the first intermediate surface and the second inclined surface is an acute angle.

[0014] According to the fifth method, even if the shape of the bone plate is slightly restored after molding, a sufficient crank shape can be maintained.

[0015] In the bone plate forming tool of the sixth aspect of this disclosure, in any of the first to fifth aspects of the bone plate forming tool, the larger k is, the longer or shorter the distance between the first imaginary line and the second imaginary line in the kth first step surface.

[0016] According to the sixth method, the first step surface corresponding to the desired crank shape can be easily selected.

[0017] The seventh embodiment of the bone plate forming tool disclosed herein, in any one of the first to sixth embodiments, wherein the N second stepped 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, and each has: a third inclined surface extending from the second base end portion, inclined toward the second wall as it approaches the second terminal portion, and extending to a third imaginary line parallel to the first direction; a fourth inclined surface extending from the second terminal portion, inclined away from the second wall as it approaches the second base end portion, and extending to a fourth imaginary line parallel to the first direction; and a second intermediate surface extending between the third imaginary line and the fourth imaginary line.

[0018] In the bone plate forming tool of the eighth aspect of this disclosure, in any one of the bone plate forming tools of the first to seventh aspects, at least one of the angle between the third inclined surface and the second intermediate surface and the angle between the second intermediate surface and the fourth inclined surface is an acute angle.

[0019] According to method eight, even if the shape of the bone plate is slightly restored after molding, a sufficient crank shape can be maintained.

[0020] In the bone plate forming tool of the ninth aspect of this disclosure, in any of the bone plate forming tools of the first to eighth aspects, the larger m is, the longer or shorter the distance between the third imaginary line and the fourth imaginary line in the m-th second step surface, where m = 1, ..., N.

[0021] According to the ninth method, the second step surface corresponding to the desired crank shape can be easily selected.

[0022] In the tenth embodiment of the bone plate forming tool disclosed herein, in any one of the first to ninth embodiments of the bone plate forming tool, the connecting rod portion is detachably connected relative to the first support portion.

[0023] According to the tenth method, separate sterilization and cleaning of the connecting rod and the first support section become easier.

[0024] In the bone plate forming tool of the eleventh aspect of this disclosure, in any one of the first to tenth aspects, the central axis of the cylindrical portion, the central portion of the first support portion, and the central portion of the second wall of the second support portion are aligned with each other.

[0025] According to the eleventh method, the bone plate is clamped by the first and second models, which can reliably transfer the force required for deformation to the bone plate without waste.

[0026] The bone plate forming tool of the twelfth aspect of this disclosure, in any one of the first to eleventh aspects of the bone plate forming tool, the first model and the first support portion form a locking mechanism that locks the kth first step surface in a state of alignment with the central axis, wherein k = 1, ..., N.

[0027] According to the twelfth method, it is easy to position and maintain the selected first step surface relative to the first support portion in the appropriate position.

[0028] The bone plate forming tool of the thirteenth aspect of this disclosure, in any one of the first to twelfth aspects of the bone plate forming tool, the second model and the second support portion form a locking mechanism that locks the m-th second step surface in a state of alignment with the central axis, where m = 1, ..., N.

[0029] According to the thirteenth method, it is easy to position and maintain the selected second step surface relative to the second support portion in the appropriate position.

[0030] In the bone plate forming tool of the fourteenth aspect of this disclosure, in any one of the first to thirteenth aspects, a through hole is formed on the cylindrical portion, extending from the outer peripheral surface to the inner peripheral surface.

[0031] According to the fourteenth method, even if water enters the cylindrical part, it can be easily drained.

[0032] In the bone plate forming tool of the fifteenth aspect of this disclosure, in any one of the first to fourteenth aspects, the connecting rod portion has an elastic member disposed between the handle portion and the hook portion, and applies force to the handle portion in a direction away from the hook portion.

[0033] According to this disclosure, a forming tool for bone plates can be provided that allows for easy assembly of bone plates to impart a desired crank shape. Attached Figure Description

[0034] Figure 1 This is a front view of a forming tool for a bone plate according to one embodiment.

[0035] Figure 2 This is a side view of the forming tool used for bone plates.

[0036] Figure 3 yes Figure 2 The V0-V0 cross-section diagram.

[0037] Figure 4 These are the top view, front view, and bottom view of the first model.

[0038] Figure 5A yes Figure 4 The V1-V1 cross-section diagram.

[0039] Figure 5B yes Figure 4 The V2-V2 cross-section diagram.

[0040] Figure 5C yes Figure 4 The V3-V3 cross-section diagram.

[0041] Figure 5D yes Figure 4 The V4-V4 cross-section diagram.

[0042] Figure 6 These are the top view, front view, and bottom view of the second model.

[0043] Figure 7A yes Figure 6 The V5-V5 cross-section diagram.

[0044] Figure 7B yes Figure 6 The V6-V6 cross-section diagram.

[0045] Figure 7C yes Figure 6 V7-V7 cross-section diagram.

[0046] Figure 7D yes Figure 6 V8-V8 cross-section diagram.

[0047] Figure 8 This is a three-dimensional diagram showing an example of the structure of a bone plate.

[0048] Figure 9 It is a three-dimensional diagram of a bone plate that has been given a crank-shaped design. Detailed Implementation

[0049] Hereinafter, a forming tool for bone plates according to one embodiment of the present disclosure will be described with reference to the accompanying drawings. In the following drawings, structural elements will be omitted appropriately for ease of explanation. Furthermore, the dimensions of the structural elements shown in the following drawings may not necessarily correspond to the actual dimensions of the structural elements.

[0050] (1. Summary)

[0051] Figure 1 and Figure 2 These are the front view and side view of the bone plate forming tool 1 (hereinafter also referred to as "forming tool 1") of this embodiment. Figure 3 yes Figure 2 The V0-V0 cross-sectional view. The forming tool 1 is a specialized instrument used to give the bone plate 5 (hereinafter also referred to as "bone plate 5"), made of thermoplastic resin, a crank shape. The bone plate 5 is a plate-shaped medical device used to fix bones to each other at fracture sites or bone cracks and to embed them into the body (see reference). Figure 8 ).like Figure 9 As shown, the crank shape in this embodiment refers to a shape in which the planar bone plate 5 is convex (or concave) along an imaginary line L5 and concave (or convex) along an imaginary line L6 parallel to the imaginary line L5. While machining the bone plate 5 into this crank shape is particularly effective in treating jaw deformities, it has historically been difficult to machine the bone plate 5 into the desired crank shape. The forming tool 1 allows the bone plate 5 to be easily shaped into the appropriate crank shape to fit the application site. Furthermore, the primary user of the forming tool 1 is assumed to be a medical professional. Hereinafter, Figure 1 The left and right directions are defined as the first direction, and Figure 1 The vertical direction is defined as the second direction, and the vertical direction is defined as the second direction. Figure 2 The left and right directions are defined as the third direction. Taking the above directions as a reference, the forming tool 1 is described. The first direction to the third direction are mutually perpendicular.

[0052] (2. Structure of forming tools)

[0053] The forming tool 1 includes a first model 11, a second model 12, a first support portion 21, a second support portion 22, a cylindrical portion 30, and a connecting rod portion 40. The first model 11 and the second model 12 are a pair of models used to shape the bone plate 5 into a predetermined crank shape by clamping the bone plate 5 between the first model 11 and the second model 12 and applying bending at two predetermined points on the bone plate 5. The first support portion 21 holds the first model 11 and is connected to the connecting rod portion 40. The first support portion 21 moves together with the first model 11 in a second direction through movement in conjunction with the connecting rod portion 40 in a second direction. The second support portion 22 holds the second model 12 and is fixed to the cylindrical portion 30. The cylindrical portion 30 and the connecting rod portion 40 are combined in a coaxial manner, extending along a common central axis A1. In this embodiment, the first model 11, the first support portion 21, and the connecting rod portion 40 are movable relative to the second model 12, the second support portion 22, and the cylindrical portion 30 in a second direction. The operation of the first model 11 and the second model 12 can be performed using the hook portion 31 formed in the cylindrical portion 30 and the grip portion 41 formed in the connecting rod portion 40. The following is a detailed description of each part.

[0054] (First Model)

[0055] Figure 4 These are the top view, front view, and bottom view of the first model 11. Figures 5A-5D They are respectively Figure 4 The cross-sectional views are V1-V1, V2-V2, V3-V3, and V4-V4. The first model 11 has an upper surface portion 111 with the first direction as its long side, and four modules 110 respectively fixed to the upper surface portion 111. The four modules 110 are arranged along the first direction and each has a different first step surface 1100. The first step surface 1100 is the surface opposite to one side of the bone plate 5 during its forming, and has a step shape described later. From the following, it will also be explained... Figure 1 The kth (k = 1, ..., 4)th module 110 and the first step surface 1100 from the left end are called module 110(k) and the first step surface 1100(k).

[0056] Each module 110 has a first base end portion 1101 extending along a first direction and a first terminal portion 1102 extending parallel to the first base end portion 1101. In each module 110, the first base end portion 1101 and the first terminal portion 1102 are straight portions forming the boundary of the outer surface. The first base end portion 1101 and the first terminal portion 1102 are arranged at a certain interval in a third direction. In this embodiment, taking the direction of clamping the bone plate 5 as a reference, the first base end portion 1101 is arranged on the front side, and the first terminal portion 1102 is arranged on the inner side. That is, the bone plate 5 is clamped between the first model 11 and the second model 12 with one end located on the side of the first terminal portion 1102 and the other end located on the side of the first base end portion 1101.

[0057] Each module 110 has a first protrusion 1103 projecting from the first terminal portion 1102 toward the second wall 222 of the second support portion 22 (described later). The first protrusion 1103 projects further toward the second wall 222 than any part of the first stepped surface 1100 of the same module 110. The first protrusion 1103 has a surface perpendicular to a third direction, which contacts one end of the bone plate 5 held between the first model 11 and the second model 12, thereby positioning the bone plate 5 relative to the first stepped surface 1100. In addition, the first protrusions 1103 of this embodiment are generally rectangular in the front view, but the shape of the first protrusions 1103 is not particularly limited.

[0058] In each module 110, a first stepped surface 1100 extends between a first base end portion 1101 and a first terminal portion 1102. The first stepped surface 1100 has a first inclined surface 1104, a second inclined surface 1105, and a first intermediate surface 1106. The first inclined surface 1104 extends from the first base end portion 1101, inclined towards the second wall 222 as it approaches the first terminal portion 1102, and extends to a first imaginary line L1. The second inclined surface 1105 extends from the first terminal portion 1102, inclined away from the second wall 222 as it approaches the first base end portion 1101, and extends to a second imaginary line L2. In this embodiment, the first inclined surface 1104 and the second inclined surface 1105 are inclined relative to a plane perpendicular to the second direction at the same angle α (0° < α < 90°). Furthermore, in this embodiment, the angle α is the same in each module 110.

[0059] Here, the first imaginary line L1 and the second imaginary line L2 are respectively imagined as imaginary lines parallel to the first direction, located between the first base end portion 1101 and the first terminal portion 1102 of each module 110. In this embodiment, in the top view of each module 110, the second imaginary line L2 does not extend beyond the first imaginary line L1 and is located on the side of the first base end portion 1101. Furthermore, the second imaginary line L2 is located further away from the second wall 222 than the first imaginary line L1.

[0060] The first intermediate surface 1106 extends between the first imaginary line L1 and the second imaginary line L2, and is continuous with the first inclined surface 1104 and the second inclined surface 1105 at both ends. The boundaries of the first intermediate surface 1106 with the first inclined surface 1104 and the second inclined surface 1105 may be rounded or have sharp edges, but are preferably rounded. In this embodiment, the modules 110(k) are arranged such that the larger k is in the first stepped surface 1100(k), the longer the first intermediate surface 1106 is; in other words, the longer the distance x between the first imaginary line L1 and the second imaginary line L2 is. The distance x is, for example, 2 mm to 5 mm.

[0061] Preferably, the angle β between the first intermediate surface 1106 and the second inclined surface 1105 is an acute angle. The bone plate 5 can be formed by heating, and after forming, the heat is removed to fix it into the formed shape. However, although slightly, the formed shape will recover towards the direction of restoring the original planar shape. When the bone plate 5 is bent along the first intermediate surface 1106 and the second inclined surface 1105, if β is 90°, the angle of the bent portion of the bone plate 5 will theoretically not reach below 90°. On the other hand, if β is an acute angle, even if the shape of the bone plate 5 subsequently recovers slightly, the aforementioned opening angle can be maintained at around 90°.

[0062] The first model 11 also has a track portion 1110 protruding from the upper surface portion 111 and extending along a first direction. The track portion 1110 engages with the track groove 210 of the first support portion 21 (described later) and can slide within the track groove 210 in the first direction. That is, the first model 11 is held by the first support portion 21 so that it can slide relative to the first support portion 21 in the first direction. In this embodiment, the track portion 1110 can slide from the first side surface 213 side of the first support portion 21 ( Figure 1 The left side of the module 110 (1) is embedded in the track groove 210. Furthermore, a protrusion 1112 is formed at the end of the module 110 (1) protruding from the track portion 1110. The protrusion 1112 and the baffle 2100 of the first support portion 21 (see reference) Figure 3 Contact, used to limit the first model 11 from exceeding this position. Figure 1 The right side slides. That is, the first model 11 of this embodiment is configured such that if it moves in one direction relative to the first support portion 21 ( Figure 1If it slides to the left side, it can be removed from the first support part 21. If it moves in the opposite direction ( Figure 1 If the right side is slid, it cannot be removed from the first support part 21.

[0063] Refer again Figure 4 In the track section 1110 of this embodiment, a small groove 1111 extending upward in a third direction is formed corresponding to each module 110. The small groove 1111 is generally arc-shaped in the front view, and is used for the spherical portion 2101 of the first support section 21 (see reference 21101) described later. Figure 3 When the spherical portion 2101 is embedded in the slot 1111, the central portion of module 110(k) is aligned with the central axis A1. Furthermore, at this time, the first model 11 is locked to a degree that prevents it from automatically sliding relative to the first support portion 21. That is, each slot 1111 and the spherical portion 2101 of the first support portion 21 form a locking mechanism that locks the first stepped surface 1100(k) in alignment with the central axis A1. When the first stepped surface 1100(k) is locked, a "click" sensation is transmitted to the user of the forming tool 1. In this way, the user can know that the first stepped surface 1100(k) is in the correct position.

[0064] (Second Model)

[0065] Figure 6 These are the top view, front view, and bottom view of the second model 12. Figures 7A-7D They are respectively Figure 6 The cross-sectional views are V5-V5, V6-V6, V7-V7, and V8-V8. The second model 12 has a lower surface portion 121 with the first direction as its long side, and four modules 120 respectively fixed to the lower surface portion 121. The four modules 120 are arranged along the first direction and each has a different second step surface 1200. The second step surface 1200 is the surface opposite to one side of the bone plate 5 when it is formed. From the following... Figure 1 The m-th (m = 1, ..., 4)th module 120 from the left end and the second step surface 1200 are referred to as module 120(m) and the second step surface 1200(m). In this embodiment, the second step surface 1200(m) with m = k corresponds to the first step surface 1100(k) relative to the first step surface 1100(k). That is, when k and m are the same, module 110(k) and module 120(m) constitute a pair of molding models.

[0066] Each module 120 has a second base end portion 1201 extending along a first direction and a second terminal portion 1202 extending parallel to the second base end portion 1201. In each module 120, the second base end portion 1201 and the second terminal portion 1202 are straight portions forming the boundary of the outer surface. The second base end portion 1201 and the second terminal portion 1202 are arranged at a certain interval in a third direction. In this embodiment, taking the direction of clamping the bone plate 5 as a reference, the second base end portion 1201 is arranged on the front side, and the second terminal portion 1202 is arranged on the inner side. That is, the bone plate 5 is clamped between the first model 11 and the second model 12 with one end located on the side of the second terminal portion 1202 and the other end located on the side of the second base end portion 1201.

[0067] In each module 120, a second stepped surface 1200 extends between a second base end 1201 and a second terminal portion 1202. The second stepped surface 1200 has a third inclined surface 1204, a fourth inclined surface 1205, and a second intermediate surface 1206. The third inclined surface 1204 extends from the second base end 1201, inclined towards the second wall 222 (described later) and extending to a third imaginary line L3. The fourth inclined surface 1205 extends from the second terminal portion 1202, inclined away from the second wall 222 and extending to a fourth imaginary line L4. The third imaginary line L3 and the fourth imaginary line L4 are respectively imaginary lines parallel to a first direction, conceived as being located between the second base end 1201 and the second terminal portion 1202 of each module 120. In this embodiment, in the top view of each module 120, the fourth imaginary line L4 does not extend beyond the third imaginary line L3 and is located on the side of the second base end 1201. Furthermore, the fourth imaginary line L4 is located further away from the second wall 222 than the third imaginary line L3.

[0068] The third inclined surface 1204, the fourth inclined surface 1205, and the second intermediate surface 1206 of module 120(m) are configured to fit into the first inclined surface 1104, the second inclined surface 1105, and the first intermediate surface 1106 of the corresponding module 110(k), respectively. That is, the third inclined surface 1204, the fourth inclined surface 1205, and the second intermediate surface 1206 of module 120(m) are parallel to the first inclined surface 1104, the second inclined surface 1105, and the first intermediate surface 1106 of the corresponding module 110(k), respectively. Furthermore, the length of the second intermediate surface 1206 of module 120(m) is the same as the length of the first intermediate surface 1106 of the corresponding module 110(k). That is, the distance between the third imaginary line L3 and the fourth imaginary line L4 of module 120(m) is the same as the distance x of the corresponding module 110(k). Therefore, in this embodiment, the modules 120(m) are arranged such that the larger m is in the second step surface 1200(m), the longer the distance between the third imaginary line L3 and the fourth imaginary line L4.

[0069] Preferably, the angle γ between the third inclined surface 1204 and the second intermediate surface 1206 is an acute angle. The reason for this is the same as that for the angle β between the first intermediate surface 1106 and the second inclined surface 1105, which has already been explained.

[0070] The second model 12 also has a track portion 1210 protruding from the lower surface portion 121 and extending along a first direction. The track portion 1210 engages with the track groove 220 of the second support portion 22 (described later) and can slide within the track groove 220 in the first direction. That is, the second model 12 is held by the second support portion 22 so that it can slide relative to the second support portion 22 in the first direction. In this embodiment, the track portion 1210 can slide from the side of the second support portion 22 (… Figure 1 The left side of the module 120 (1) is embedded in the track groove 220. Furthermore, a protrusion 1212 is formed at the end of the module 120 (1) protruding from the track portion 1210. The protrusion 1212 and the baffle 2220 of the second support portion 22 (see reference) Figure 3 ( ) Contact, used to limit the second model 12 beyond this position towards Figure 1 The right side slides. That is, the second model 12 of this embodiment is configured such that if it moves in one direction relative to the second support portion 22 ( Figure 1 If it slides to the left side, it can be removed from the second support part 22. If it moves in the opposite direction ( Figure 1 If it slides on the right side, it cannot be removed from the second support section 22.

[0071] Refer again Figure 6In the track section 1210 of this embodiment, a small groove 1211 extending upward in a third direction is formed corresponding to each module 120. The small groove 1211 is generally arc-shaped in the front view, and is used for the spherical portion 2221 of the second support section 22 (see reference 2221) described later. Figure 3 When the spherical portion 2221 is embedded in the slot 1211, the central portion of module 120(m) is aligned with the central axis A1. Furthermore, at this time, the second model 12 is locked to a degree that prevents it from automatically sliding relative to the second support portion 22. That is, the spherical portions 2221 of each slot 1211 and the second support portion 22 form a locking mechanism that locks the second step surface 1200(m) in alignment with the central axis A1. When the second step surface 1200(m) is locked, a "click" sensation is transmitted to the user of the forming tool 1. In this way, the user can know that the second step surface 1200(m) is in the correct position.

[0072] (First support section)

[0073] Refer again Figures 1-3 The first support portion 21 is located between the first wall 221 and the second wall 222 of the second support portion 22 (described later), and moves together with the first model 11 in a second direction. In this embodiment, the first support portion 21 is generally cuboid in shape, having an upper surface 211, a lower surface 212, a first side surface 213, and a second side surface 214. The upper surface 211 is approximately the same size as the lower surface of the first wall 221 and faces the lower surface of the first wall 221. The lower surface 212 has a track groove 210 extending in the first direction, which slidably accommodates the track portion 1110 of the first model 11. Thus, the first support portion 21 holds the first model 11 such that the lower surface 212 faces the upper surface portion 111 of the first model 11, and the first step surface 1100(k) faces the second step surface 1200(m).

[0074] like Figure 3 As shown, a spherical portion 2101 is also disposed on the lower surface 212. In this embodiment, the spherical portion 2101 is made of a known ball plug. In this way, the spherical portion 2101 contacts the track portion 1110 to a degree that does not hinder the sliding movement of the track portion 1110, and when the spherical portion 2101 is opposite to the groove 1111, it is embedded in the groove 1111, thereby functioning as the locking mechanism described above.

[0075] The first side surface 213 and the second side surface 214 are the opposite sides that sandwich the upper surface 211, respectively. The first side surface 213 is located at... Figure 1 On the left side, the second side 214 is located Figure 1The right side. The first support portion 21 also has a baffle 2100 recessed inward from the first side 213. The baffle 2100 is, for example, a wall formed by cutting off a portion of the first support portion 21 from the first side 213 and the lower surface 212, and restricts the sliding movement of the first model 11 by contacting the protrusion 1112 of the first model 11.

[0076] The first support portion 21 also has a connecting portion 215. The connecting portion 215 is the part that connects to one end of the connecting rod portion 40, and in this embodiment, it is a through hole extending from the upper surface 211 to the lower surface 212. As will be described later, one end of the connecting rod portion 40 has an elastically deformable connected portion 43, which engages with the inner wall of the connecting portion 215, thereby connecting the connecting rod portion 40 and the first support portion 21 to each other. Preferably, the connecting portion 215 is formed in the central portion of the first support portion 21 (the center of the first support portion 21 and its vicinity) in top view, and is coaxially formed with the through hole 2210 described later.

[0077] (Second support section)

[0078] like Figure 2 As shown, the second support portion 22 has a first wall 221, a second wall 222 opposite to the first wall 221, and a third wall 223 extending in a second direction. The third wall 223 is fixed to the first wall 221 and the second wall 222 in such a way that the first wall 221 and the second wall 222 are separated by a predetermined interval in the second direction. The second support portion 22 positions the first support portion 21 and the first model 11 between the first wall 221 and the second model 12 such that the first step surface 1100(k) of the first model 11 faces the second wall 222.

[0079] In this embodiment, the upper surface of the second wall 222 has the same dimensions as the lower surface of the first wall 221. Furthermore, the first wall 221, the first support portion 21, and the second wall 222 are aligned such that they overlap when viewed from above. Thus, when the central axis A1 is aligned with the center portion of the first support portion 21 in a top view, the central axis A1 is also aligned with the center portion of the second wall 222 (the center of the second wall 222 and its vicinity). A track groove 220 extending in a first direction is formed on the upper surface of the second wall 222, which slidably accommodates the track portion 1210 of the second model 12. Thus, the second support portion 22 holds the second model 12 such that the upper surface of the second wall 222 faces the lower surface portion 121 of the second model 12, and the second step surface 1200 (m) faces the first step surface 1100 (k). Preferably, the track groove 210, the track groove 220, and the central axis A1 are aligned with each other in a third direction.

[0080] like Figure 3As shown, a spherical portion 2221 is also disposed on the upper surface of the second wall 222. In this embodiment, the spherical portion 2221 is made of a known ball plug. In this way, the spherical portion 2221 contacts the track portion 1210 to a degree that does not hinder the sliding movement of the track portion 1210, and when the spherical portion 2221 is opposite to the groove 1211, it is embedded in the groove 1211, thereby functioning as the locking mechanism described above.

[0081] The second support portion 22 also has a baffle 2220 at a position opposite to the baffle 2100. The baffle 2220 is, for example, a wall surface formed by cutting off a portion of the second wall 222 from the side and top surfaces of the second wall 222, and restricts the sliding movement of the second model 12 by contacting the protrusion 1212 of the second model 12.

[0082] like Figure 2 As shown, with the track portion 1210 of the second model 12 embedded in the track groove 220, a certain space is formed between the third wall 223 and the second terminal portion 1202 of the second model 12. When the first model 11 and the second model 12 are closed, the first protrusion 1103 of the first model 11 is embedded in this space, which does not prevent the bone plate 5 from being clamped by the first model 11 and the second model 12.

[0083] Refer again Figure 3 The second support portion 22 is fixed to one end of the cylindrical portion 30 on the upper surface of the first wall 221. In this embodiment, the first wall 221 and the cylindrical portion 30 are integrally formed, and the first wall 221 has a through hole 2210 that is continuous with the inner cavity of the cylindrical portion 30. The through hole 2210 is coaxially formed with the central axis A1, and the middle portion 400 of the connecting rod portion 40 (described later) can slide within the through hole 2210.

[0084] (Tubular part)

[0085] The cylindrical portion 30 is a hollow member with one end fixed to the second support portion 22 and extending from the first wall 221 to the side opposite to the second wall 222. The other end of the cylindrical portion 30 has a hook portion 31 for the user to hook their finger using the forming tool 1. In this embodiment, the hook portion 31 extends to both sides in a first direction with the central axis A1 as a reference. The hook portion 31 can be of any shape as long as it can hook a finger, but a cornerless shape is preferred to avoid damaging the medical glove.

[0086] In this embodiment, the cylindrical portion 30 has a through hole 300 extending from the outer peripheral surface to the inner peripheral surface. The through hole 300 functions as a drain outlet for removing water that has entered the interior after the forming tool 1 and the bone plate 5 have been immersed together in hot water during the forming process. There may be one or more through holes 300. Furthermore, the location of the through hole 300 within the cylindrical portion 30 is not particularly limited.

[0087] (Connecting rod section)

[0088] The connecting rod portion 40 includes: a connected portion 43 formed at one end; a grip portion 41 formed at the other end; an intermediate portion 400 extending between them; and a coil spring 42. The connected portion 43 is the part that is connected to the first support portion 21 as described above. In this embodiment, the connected portion 43 has two pins at its front end. By applying a force to the pins to bring them closer together and inserting them into the connecting portion 215, and then releasing the force, the pins separate and engage with the inner wall of the connecting portion 215. Thus, the connected portion 43 is connected to the connecting portion 215.

[0089] A handle portion 41 is formed at the other end of the connecting rod portion 40. The handle portion 41 is a part that is pressed by hand to bring it close to the hook portion 31. In this embodiment, it extends to both sides in a first direction with the central axis A1 as a reference. In particular, by hooking the fingers of one hand onto the hook portion 31 and holding the handle portion 41 with the same hand to bring the hook portion 31 close to the handle portion 41, the bone plate 5 can be easily clamped between the first model 11 and the second model 12 with one hand. The handle portion 41 can be of any shape, but it is preferably formed in a shape without sharp edges in a way that does not damage a medical glove.

[0090] The middle portion 400 is a rod-shaped section, and its central axis passes through the cylindrical portion 30 and slides within it while aligned with the central axis A1 of the cylindrical portion 30. A coil spring 42 is wound between the hook portion 31 and the grip portion 41 in the middle portion 400. The coil spring 42 exerts a force on the grip portion 41 in a direction away from the hook portion 31. In other words, the coil spring 42 exerts a force on the first model 11 in a direction that moves the first model 11 away from the second model 12.

[0091] (overall)

[0092] The first model 11, the second model 12, the first support portion 21, the second support portion 22, the cylindrical portion 30, and the connecting rod portion 40 can each be made of metal such as stainless steel. Furthermore, considering ease of sterilization and cleaning, it is preferable that the above-mentioned parts can be disassembled from each other. Moreover, it is preferable that the forming tool 1 is beveled into a rounded shape without sharp edges, in a manner that does not damage medical gloves.

[0093] (3. How to use forming tools)

[0094] Figure 8This is a perspective view showing an example of the structure of the bone plate 5. The bone plate 5 has a first surface 53 and a second surface 54 opposite to the first surface 53. The first surface 53 and the second surface 54 extend between a first end 51 and a second end 52, respectively. The orientation of the first end 51 and the second end 52 is set as the long side direction of the bone plate 5. In this embodiment, the bone plate 5 has two or more through holes formed along its long side direction for fixing it to the bone with screws. The bone plate 5 is, for example, formed of a biodegradable thermoplastic resin such as L-lactide-glycolic acid copolymer, which is prone to deformation if soaked in hot water at a specified temperature for a specified time.

[0095] Bone plate 5, shaped like a crank, such as Figure 9 The plate shown has a first portion 510 including a first end 51, a second portion 520 including a second end 52, and a third portion 530. The third portion 530 is an angled portion relative to the first portion 510 and the second portion 520, corresponding to the first intermediate surface 1106 of the first stepped surface 1100 and the second intermediate surface 1206 of the second stepped surface 1200. Hereinafter, the forming tool 1 will be used to shape the bone plate 5 into... Figure 9 Method of using forming tool 1 when forming the crank shape (forming method of bone plate 5).

[0096] First, from the first step surface 1100(k) and the second step surface 1200(m), a first step surface 1100(k) and a second step surface 1200(m) that correspond to the desired crank shape are selected. In this embodiment, a first step surface 1100(k) and a second step surface 1200(m) having a first intermediate surface 1106 and a second intermediate surface 1206 corresponding to the length of the desired third portion 530 (the distance between imaginary lines L5 and L6) can be selected. Next, modules 110(k) and 120(m) having the selected first step surface 1100(k) and second step surface 1200(m) are aligned relative to the central axis A1.

[0097] Next, the bone plate 5 is positioned between the first model 11 and the second model 12. Specifically, the hook portion 31 and the handle portion 41 are grasped, and the long side of the bone plate 5 is aligned with the third direction, so that the first end 51 contacts the first protrusion 1103 of the first model 11, and the bone plate 5 is gently clamped between the first model 11 and the second model 12. Alternatively, the second end 52 may be in contact with the first protrusion 1103 instead of the first end 51. Furthermore, if there is no difference between the first surface 53 and the second surface 54, either surface can be opposite the first stepped surface 1100(k).

[0098] Next, while maintaining the above-described state, the bone plate 5 and the forming tool 1 are heated together. In this embodiment, heating is performed by immersing the forming tool 1 and the bone plate 5 in hot water (e.g., 65°C to 90°C) for a predetermined time (e.g., 10 seconds). After the predetermined time, the forming tool 1 and the bone plate 5 are removed together, and the hook portion 31 and the handle portion 41 are firmly grasped, and the bone plate 5 is securely clamped by the first mold 11 and the second mold 12. After maintaining this state for a predetermined time (e.g., 5 seconds), the hook portion 31 and the handle portion 41 are separated, the first mold 11 and the second mold 12 are opened, and the bone plate 5 is left to stand at room temperature (e.g., 10°C to 30°C) to remove heat. In this way, the bone plate 5 is fixed in a crank shape. Since the temperature of the bone plate 5 drops by approximately 40 degrees Celsius in about 10 seconds, it can be used as soon as possible after forming.

[0099] (4. Variations)

[0100] The above describes one embodiment of this disclosure; however, this disclosure is not limited to the above embodiment, and various modifications can be made without departing from the spirit of this utility model. For example, the following modifications can be made. Furthermore, the main features of the following variations can be appropriately combined.

[0101] (1) The number of modules 110 and 120 in the first model 11 and the second model 12 is not limited to the above-described embodiments. The first model 11 and the second model 12 may each have N (≥2) modules 110 and 120, that is, N first step surfaces 1100 and second step surfaces 1200. Furthermore, the arrangement and shape of the first step surfaces 1100 and the second step surfaces 1200 are not limited to the above-described embodiments. For example, the first step surfaces 1100(k) may be arranged such that the larger k is, the shorter the distance x is, and the second step surfaces 1200(m) may be arranged such that the larger m is, the shorter the distance x is. In addition, the first step surfaces 1100(k) and the second step surfaces 1200(m) may not be arranged according to this rule. Furthermore, the N first step surfaces 1100 and the N second step surfaces 1200 may also contain different α, β, and γ.

[0102] (2) The positional relationship between the first model 11 and the second model 12 can also be reversed. That is, the first model 11 of the above embodiment can be set as the second model, and the second model 12 of the above embodiment can be set as the first model. In this case, it is preferable that the angle between the first inclined surface 1104 and the first intermediate surface 1106 is an acute angle, and it is preferable that the angle between the second intermediate surface 1206 and the fourth inclined surface 1205 is an acute angle. In addition, the first protrusion 1103 may not be formed on the first model 11, but may be formed as a second protrusion on the second model 12. Alternatively, the first protrusion 1103 may be omitted. Or, the first protrusion 1103 may be formed on a part of module 110 of the first model 11, or on a part of module 120 of the second model 12.

[0103] (3) The locking mechanism may be omitted. Furthermore, the structure of the locking mechanism is not limited to the above-described embodiments. For example, the first support portion 21 may have a structure equivalent to the groove 1111, and the first model 11 may have a structure equivalent to the spherical portion 2101. Similarly, the second support portion 22 may have a structure equivalent to the groove 1211, and the second model 12 may have a structure equivalent to the spherical portion 2221. Furthermore, at least one of the protrusion 1112 and the baffle 2100, and the protrusion 1212 and the baffle 2220, may be omitted.

[0104] (4) The structure of the sliding mechanism that holds the first model 11 in a sliding manner by the first support portion 21 is not limited to the above-described embodiment. For example, the first support portion 21 may have a structure equivalent to the track portion 1110, and the first model 11 may have a structure equivalent to the track groove 210. Furthermore, the structures of the track portion 1110 and the track groove 210 may also be appropriately modified. Similarly, the second support portion 22 may have a structure equivalent to the track portion 1210, and the second model 12 may have a structure equivalent to the track groove 220. Furthermore, the structures of the track portion 1210 and the track groove 220 may also be appropriately modified. In addition, the first support portion 21 and the second support portion 22 may be extended in the first direction.

[0105] (5) The structure of the connection mechanism between the connecting part 215 and the connected part 43 is not limited to the above embodiment. For example, the first support part 21 may have a connecting part that can be elastically deformed. In addition, the connection mechanism between the connecting part 215 and the connected part 43 may be implemented by other components such as bolts. Moreover, the connection mechanism may be omitted, and the first support part 21 and the connecting rod part 40 may be configured as a non-removable structure.

[0106] (6) The structure of the hook portion 31 and the grip portion 41 is not limited to the above-described embodiment. For example, the central axis A1 can be used as a reference, and the hook portion 31 and the grip portion 41 can protrude only to one side in the first direction. In addition, the coil spring 42 can be replaced with other elastic components such as a leaf spring, and can be disposed between the lower surface 212 of the first support portion 21 and the upper surface of the second wall 222, or it can be omitted. Moreover, the through hole 300 can be omitted.

[0107] Explanation of reference numerals in the attached figures

[0108] 1. Forming tools

[0109] 5. Bone plate

[0110] 11 First Model

[0111] 12 Second Model

[0112] 21 First support section

[0113] 22 Second support section

[0114] 30 cylindrical part

[0115] 31 hook finger part

[0116] 40 Linkage Section

[0117] 41 Handle section

[0118] 42. Coil spring (elastic component)

[0119] 221 First Wall

[0120] 222 Second Wall

[0121] 1100 First step surface

[0122] 1200 Second step surface

Claims

1. A forming tool for bone plates, used to impart a crank shape to bone plates made of thermoplastic resin, characterized in that, include: The first model has N first step surfaces that form different step shapes from each other, where N≥2; The second model has N second step surfaces that form step shapes corresponding to the N first step surfaces; The first support section holds the first model; The second support portion has a first wall and a second wall disposed at a predetermined interval from the first wall, holds the second model on the second wall such that the N second step surfaces face the first wall side, and positions the first support portion between the second model and the first wall such that the N first step surfaces face the second wall side; The cylindrical portion is a hollow cylindrical portion with one end fixed to the second support portion and extending from the first wall in the opposite direction to the second wall, and a hook portion for hooking a finger is formed at the other end; and The connecting rod portion has one end connected to the first support portion and the other end formed with a handle portion for gripping. The connecting rod portion has a rod-shaped intermediate portion that extends coaxially with the cylindrical portion and penetrates the cylindrical portion and the first wall between the first support portion and the handle portion. The N first step surfaces are arranged sequentially along a first direction from the first first step surface to the Nth first step surface. The N second step surfaces are arranged sequentially along the first direction from the first second step surface to the Nth second step surface. The first model is held in a position to slide in the first direction relative to the first support portion. The second model is held in a position to slide relative to the second support portion in the first direction. If the finger is hooked in the hook portion and the handle portion is gripped, the connecting rod portion slides within the cylindrical portion, thereby bringing the first support portion and the second support portion closer together. Then, the first model and the second model clamp the bone plate between the kth first step surface and the second step surface corresponding to the kth first step surface, giving the bone plate a specified crank shape, where k = 1, ..., N.

2. The forming tool for bone plates according to claim 1, characterized in that, The k-th first step surface extends between a first base end portion extending along the first direction and a first terminal portion extending parallel to the first base end portion. The first model has at least one first protrusion projecting from the first terminal portion toward the second wall. The first protrusion protrudes closer to the second wall than any part of the kth first step surface, and positions the bone plate relative to the kth first step surface by contacting the end of the bone plate held between the first model and the second model.

3. The forming tool for bone plates according to claim 1 or 2, characterized in that, The m-th second step surface extends between a second base end portion extending along the first direction and a second terminal portion extending parallel to the second base end portion, where m = 1, ..., N. The second model has at least one second protrusion protruding from the second terminal portion toward the first wall. The second protrusion protrudes closer to the first wall than any part of the m-th second step surface, and positions the bone plate relative to the m-th second step surface by contacting the end of the bone plate held between the first model and the second model.

4. The forming tool for bone plates according to claim 1 or 2, characterized in that, The N first stepped surfaces extend between a first base end portion extending along the first direction and a first terminal portion extending parallel to the first base end portion, and each has: A first inclined surface extends from the first base end, inclined toward the second wall as it approaches the first terminal portion, and extends to a first imaginary line parallel to the first direction; A second inclined surface extends from the first terminal portion, inclined away from the second wall as it moves toward the first base end portion, and extends to a second imaginary line parallel to the first direction; and The first intermediate plane extends between the first imaginary line and the second imaginary line.

5. The forming tool for bone plates according to claim 4, characterized in that, At least one of the angle between the first inclined surface and the first intermediate surface and the angle between the first intermediate surface and the second inclined surface is an acute angle.

6. The forming tool for bone plates according to claim 4, characterized in that, The larger k is, the longer or shorter the distance between the first imaginary line and the second imaginary line in the kth first step surface.

7. The forming tool for bone plates according to claim 1 or 2, characterized in that, The N second stepped 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, and each has: A third inclined surface extends from the second base end, inclined toward the second wall as it approaches the second terminal portion, and extends to a third imaginary line parallel to the first direction; A fourth inclined surface extends from the second terminal portion, inclined away from the second wall as it moves toward the second base end portion, and extends to a fourth imaginary line parallel to the first direction; as well as The second intermediate surface extends between the third imaginary line and the fourth imaginary line.

8. The forming tool for bone plates according to claim 7, characterized in that, At least one of the angles between the third inclined surface and the second intermediate surface and between the second intermediate surface and the fourth inclined surface is an acute angle.

9. The forming tool for bone plates according to claim 7, characterized in that, The larger m is, the longer or shorter the distance between the third imaginary line and the fourth imaginary line in the m-th second step surface, where m = 1, ..., N.

10. The forming tool for bone plates according to claim 1 or 2, characterized in that, The connecting rod portion is detachably connected to the first bracket portion.

11. The forming tool for bone plates according to claim 1 or 2, characterized in that, The central axis of the cylindrical portion, the central portion of the first support portion, and the central portion of the second wall of the second support portion are aligned with each other.

12. The forming tool for bone plates according to claim 11, characterized in that, The first model and the first support portion form a locking mechanism that locks the k-th first step surface in alignment with the central axis, where k = 1, ..., N.

13. The forming tool for bone plates according to claim 11, characterized in that, The second model and the second support form a locking mechanism that locks the m-th second step surface in alignment with the central axis, where m = 1, ..., N.

14. The forming tool for bone plates according to claim 1 or 2, characterized in that, The cylindrical portion has a through hole extending from the outer circumferential surface to the inner circumferential surface.

15. The forming tool for bone plates according to claim 1 or 2, characterized in that, The connecting rod portion has an elastic member disposed between the grip portion and the hook portion, which applies force to the grip portion in a direction away from the hook portion.

Images