Femoral neck trial mold removal device and bone hook tool

Abstract

The present invention relates to a femoral neck trial mold removal device and a bone hook tool, wherein the bone hook tool comprises: a hook portion having a first through hole; a connecting rod, comprising a first connecting rod and a second connecting rod, the two ends of the second connecting rod being respectively connected to the first connecting rod and the hook portion, the hook portion and the first connecting rod extending toward the same side of the second connecting rod, the second connecting rod being provided with a second through hole penetrating the second connecting rod, the second through hole being provided with a support surface, the second through hole and the first through hole together forming an internal channel through the bone hook tool, the internal channel being used for a pry bar to pass through so as to abut against the support surface and capable of rotating with the support surface as a fulcrum. During the femoral neck trial mold removal surgery, the pry bar passes through the interior of the bone hook tool, and the gap that needs to be reserved between the bone hook tool and the femoral neck trial mold is very small. The first connecting rod of the bone hook tool can be raised as high as possible, thereby changing the direction of force application so that the direction of force application is closer to the horizontal direction than the prior art and more in line with operating habits.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a femoral neck trial mold removal device and a bone hook tool. Background Art

[0002] Traditional total hip replacement surgery requires severing the external rotator muscles, disrupting the integrity of the joint capsule and affecting the function of the muscles surrounding the hip joint. The procedure also requires surgical dislocation, requiring the coordinated efforts of multiple personnel. Consequently, an increasing number of surgeons and their assistants are experimenting with the SuperPATH (Supercapsular Percutaneously Assisted Total Hip) minimally invasive surgical approach, which accesses the hip joint from the posterior aspect through the gap between the piriformis and gluteus minimus muscles. This approach preserves the function of the muscles surrounding the hip joint and the intact joint capsule, significantly reducing intraoperative bleeding and tissue damage. However, because the SuperPATH minimally invasive approach involves a small, deep incision that preserves the muscle and joint capsule, the connection between the intramedullary burr and the trial model becomes encased in muscle and joint capsule during the reduction of the prosthetic trial model. The tension of these muscles and joint capsule significantly increases the difficulty of separating the femoral neck trial model from the intramedullary burr and disassembling the trial model. Furthermore, it can easily damage the instruments and, in severe cases, can cause soft tissue damage during dislocation. Therefore, how to quickly remove the femoral neck trial model remains a topic of intense research for those skilled in the art.

[0003] Conventional techniques, such as CN201480054952.X and CN201520269872.8, disclose the use of a bone hook tool in conjunction with a puncture rod to quickly remove a femoral neck mold. Specifically, when separating the femoral neck mold from the medullary cavity file, the patient lies on their side, and the doctor or assistant holds the connecting rod of the bone hook and uses the tip of the bone hook tool to hook the medullary cavity file and pull the medullary cavity file. The puncture rod then uses a side surface of the bone hook tool or a concave surface provided on the side surface as a fulcrum to apply force to the femoral neck mold to complete the separation of the medullary cavity file from the femoral neck mold, thereby avoiding damage to the instrument and the patient's soft tissue, reducing the difficulty of the operation, and further achieving a minimally invasive effect.

[0004] However, in the process of implementing the above conventional technology, the inventors found that the handheld portion of the connecting rod of the bone hook tool of CN201480054952.X or CN201520269872.8 is approximately vertically downward, which makes it inconvenient and laborious for the doctor or assistant to pull the connecting rod backward. Summary of the Invention

[0005] Based on this, an object of the present invention is to provide a bone hook tool that can solve the problem that traditional bone hook tools are relatively laborious to use.

[0006] A bone hook tool is used in conjunction with a pry bar to separate a femoral neck trial mold from a femur, the bone hook tool comprising: a hook portion provided with a first through hole penetrating the hook portion; a connecting rod, the connecting rod comprising a first connecting rod and a second connecting rod, the two ends of the second connecting rod being connected to the first connecting rod and the hook portion respectively, the hook portion and the first connecting rod extending toward the same side of the second connecting rod, the second connecting rod being provided with a second through hole penetrating the second connecting rod, a support surface being provided in the second through hole, the second through hole and the first through hole together forming an internal channel penetrating the bone hook tool, the internal channel being used for the pry bar to pass through so as to rest against the support surface and be able to rotate with the support surface as a fulcrum.

[0007] During femoral neck trial cast removal surgery, the surgeon or assistant grasps the first connecting rod, inserting the hook into the groove of the trial cast tool. The pry bar then passes through the second through-hole, the first through-hole, and into the slot on the femoral neck trial cast. Simultaneously, the pry bar rests against the support surface and can rotate around it, creating a lever mechanism. The surgeon or assistant then uses the bone hook tool to pull the muscles while simultaneously rotating the pry bar to leverage and remove the femoral neck trial cast, thereby reducing the difficulty of dislocating the trial cast and minimizing injury.

[0008] When the above-mentioned femoral neck trial mold removal device is used, the pry rod passes through the inside of the bone hook tool, and the gap that needs to be reserved between the bone hook tool and the femoral neck trial mold is very small, so that the first connecting rod of the bone hook tool can be raised as much as possible, and then the force direction is changed, so that the force direction is closer to the horizontal direction than the existing technology, more in line with operating habits, more labor-saving, and solves the irreconcilable contradiction between the operation of raising the bone hook tool and the coordinated use of the bone hook tool and the puncture rod in the existing technology.

[0009] In one embodiment, the supporting surface is an arc surface protruding toward the first connecting rod.

[0010] In one embodiment, the second connecting rod is provided with a positioning rod, and the cylindrical surface of the positioning rod forms the supporting surface.

[0011] In one embodiment, the positioning rod is a positioning pin, and along the extension direction of the second through hole, the second connecting rod is provided with a plurality of pin holes detachably connected to the positioning pin, so that the position of the positioning pin on the second connecting rod is adjustable.

[0012] In one embodiment, the support surface is provided on a hole wall of the second through hole close to one end of the first connecting rod.

[0013] In one embodiment, the first through hole and the second through hole are connected as one body.

[0014] In one embodiment, a positioning portion for the pry bar to abut is provided on the outer side of the connection between the hook portion and the second connecting rod.

[0015] In one embodiment, the positioning portion is a groove or a friction enhancing structure.

[0016] In one embodiment, the angle between the first connecting rod and the second connecting rod is 30-150 degrees, the angle between the hook and the second connecting rod is 30-150 degrees, and the distance from the support surface to the hook is 10mm-60mm.

[0017] A femoral neck trial mold removal device is used to separate the femoral neck trial mold from the femur, comprising a bone hook tool and a pry bar used in conjunction with each other, wherein the bone hook tool is any of the bone hook tools described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of a bone hook tool according to an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the working state of a bone hook tool according to an embodiment of the present invention.

[0020] Figure 3 Schematic diagram of the structure of a bone hook tool according to another embodiment of the present invention.

[0021] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at the support surface shown in the X part.

[0022] Figure 5 Schematic diagram of the working state of a bone hook tool according to another embodiment of the present invention.

[0023] Figure 6 FIG1 is a schematic top view of a bone hook tool according to another embodiment of the present invention.

[0024] Figure 7 for Figure 6 Cross-sectional view along the AA axis.

[0025] Figures 8 to 11 Schematic diagram of different implementations of the hook tip of the bone hook tool according to an embodiment of the present invention.

[0026] The corresponding numbers of the relevant components in the figure are as follows:

[0027] 100, bone hook tool; 10, hook portion; 110, first through-hole; 120, hook body; 130, hook tip; 20, connecting rod; 210, first connecting rod; 220, second connecting rod; 221, second through-hole; 222, positioning pin; 223, supporting surface; 224, pin hole; 230, first curved portion; 240, second curved portion; 250, positioning portion; 30, handle; 200, pry bar; 300, pelvis; 400, femur; 500, femoral neck trial mold; 501, hole groove; 600, medullary cavity file. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] As described in the background, when using conventional bone hook tools, the handheld portion of the connecting rod is approximately vertically downward. This makes it difficult and laborious for the doctor or assistant to apply force to pull the connecting rod backward. It is understandable that a handle could also be attached to the handheld portion of the connecting rod, as disclosed in CN201520269872.8. In this case, the medical professional would grasp the handle to pull the bone hook tool backward.

[0035] Practice has shown that the difficulty and effort involved in applying force with existing bone hook tools stems from an inappropriate direction of force application. Specifically, the surgeon or assistant must pull the bone hook tool backward while hooking the medullary rasp. Furthermore, applying force vertically downward, while the patient is lying on their side, is inconvenient and laborious.

[0036] To this end, an obvious solution is: when the bone hook tool is hooked on the medullary cavity file, pull the bone hook tool backward and lift the bone hook tool so that the angle between the traction direction and the vertical direction can be as large as possible, and the traction direction is close to the horizontal direction, which is closer to the operating habit.

[0037] However, during implementation of this solution, it was discovered that raising the bone hook tool compromised the operating space of the puncture rod, and in severe cases, made it impossible to use the puncture rod to pry the femoral neck mold. Specifically, there is a gap between the positioning portion of the bone hook tool, which supports the puncture rod, and the femoral neck mold. This gap is used to position the puncture rod. The gap must be large enough to accommodate the puncture rod and allow it to rest against the positioning portion, thereby applying force to the femoral neck mold using the principle of leverage. However, when the bone hook tool is raised, the positioning portion moves closer to the femoral neck mold than before, reducing the gap and hindering the insertion of the puncture rod. One possible remedy is to reduce the size of the puncture rod while increasing its strength, but this would significantly increase the manufacturing cost of the puncture rod. Therefore, in the prior art, there is an irreconcilable contradiction between "raising the bone hook tool" and "coordinating the use of the bone hook tool and the puncture rod." This contradiction has resulted in extremely limited results in prior art efforts to address the inconvenient operation and laborious use.

[0038] In order to avoid the above-mentioned contradictions and to more effectively solve the problems existing in the prior art, the present invention provides the following technical solutions.

[0039] like Figure 1 As shown, an embodiment of the present invention provides a bone hook tool 100; Figure 2 FIG. 1 illustrates the working state of the bone hook tool 100 and the pry bar 200 used together to separate the femoral neck trial 500 in the pelvis 300 from the intramedullary rasp 600 in the femur 400. The intramedullary rasp 600 can be replaced with any prosthesis or tool compatible with the femoral neck trial 500, such as a femoral stem prosthesis. The following description uses the intramedullary rasp 600 as an example.

[0040] like Figure 1 As shown, the bone hook tool 100 includes a hook portion 10 and a connecting rod 20 connected to the hook portion 10, wherein the hook portion 10 is used to be inserted into the groove on the trial mold tool 600, and the connecting rod 20 can be used for gripping operation.

[0041] The connecting rod 20 includes a first connecting rod 210 and a second connecting rod 220. The ends of the second connecting rod 220 are connected to the first connecting rod 210 and the hook portion 10, respectively. The hook portion 10 and the first connecting rod 210 extend toward the same side of the second connecting rod 220. The "ends" of the second connecting rod 220 refer to the ends along its extension direction, and the "two sides" of the second connecting rod 220 refer to the front and back sides of the second connecting rod 220, when the second connecting rod 220 is considered a plane. Thus, the connection between the first connecting rod 210 and the second connecting rod 220 forms a first bend 230, and the connection between the hook portion 10 and the second connecting rod 220 forms a second bend 240. For ease of operation, a handle 30 is attached to the end of the first connecting rod 210 away from the second connecting rod 220. The handle 30 also has anti-slip features, which may include anti-slip grooves, knurling, coarse sandblasting, etc.

[0042] like Figure 1 As shown, the cross-sectional area of ​​the hook portion 10 gradually decreases from the first bend 230 to the end of the hook portion 10, so that the hook portion 10 is generally pointed, which is convenient for insertion into the groove of the intramedullary file. Specifically, the hook portion 10 can be conical or irregular in shape with a gradually decreasing cross-sectional area.

[0043] The hook portion 10 includes a hook body 120 and a hook tip 130 connected to the end of the hook body 120. The hook tip 130 is convenient for inserting into the groove of the intramedullary file. There are many ways to set the hook tip 130. For example, Figure 8 The end surface of the hook body 120 is provided with an arc surface, and the hook tip 130 is roughly conical and located at the center of the arc surface. Figure 9 As shown, Figure 8 Similar, except that the hook tip 130 is generally conical but the taper is much greater than Figure 8 The taper of the hook tip 130. For example, Figure 10 As shown, the hook tip 130 is roughly conical, and the side of the cone is connected to the two side edges of the hook body 120. For another example, the hook tip 130 is roughly cylindrical and is set at the center of the end surface of the hook body 120.

[0044] like Figure 1 and Figure 2As shown, the hook portion 10 and the connecting rod 20 are both formed into a plane, and are both formed with an outer surface facing the pelvis 300 and an inner surface facing away from the pelvis 300. The hook portion 10 is provided with a first through hole 110 that penetrates the hook portion 10 in a direction perpendicular to the plane. The second connecting rod 220 is provided with a second through hole 221 that penetrates the second connecting rod 220 in a direction perpendicular to the plane. A positioning rod is connected to the second through hole 221, and the positioning rod provides a support surface 223. The second through hole 221 and the first through hole 110 together constitute an internal channel of the penetrating bone hook tool 100, so that the pry bar 200 can pass through the internal channel and can abut against the support surface 223, and can rotate with the support surface 223 as a fulcrum. Specifically, the pry bar 200 can be inserted from the outer surface of the second connecting rod 220 along the second through hole 221, and then extend from the outer surface of the hook portion 10 along the first through hole 110.

[0045] The positioning rod is fixedly connected or detachably connected to the second connecting rod 220. Preferably, the positioning rod is a positioning pin 222, such as Figure 1 As shown, along the extension direction of the second through-hole 221, the second connecting rod 220 is provided with multiple pin holes 224 (only two pin holes 224 are schematically shown in the figure) that are detachably connected to the positioning pins 222. This allows the position of the positioning pins 222 on the second connecting rod 220 to be adjustable. This allows the surgeon or assistant to adjust the fulcrum position according to their preference, improving operational convenience and saving surgical time. In some preferred embodiments, the extension direction of the second through-hole 221 is also the extension direction of the second connecting rod 220.

[0046] like Figure 2 As shown, during the femoral neck trial mold removal surgery, the doctor or assistant grasps the handle 30, inserting the hook portion 10 into the groove of the intramedullary rasp. The pry bar 200 sequentially passes through the second through-hole 221 and the first through-hole 110 and enters the hole 501 on the femoral neck trial mold 500. Simultaneously, the pry bar 200 abuts against the positioning pin 222 and can rotate around the support surface 223, forming a lever mechanism. The doctor or assistant can then use the bone hook tool 100 to pull the muscle while rotating the pry bar 200 to pry and remove the femoral neck trial mold 500 through the lever action, thereby reducing the difficulty of mold dislocation and minimizing damage.

[0047] In one example, Figure 6 and Figure 7As shown, to ensure an appropriate lever arm for pulling the intramedullary file, the angle α between the first connecting rod 210 and the second connecting rod 220 can be defined as 30-150 degrees based on anatomical data. The angle β between the hook portion 10 and the second connecting rod 220 can also be defined as 30-150 degrees. The hook portion 10 is approximately parallel to the first connecting rod 210. When the hook portion 10 is inserted into the groove of the intramedullary file, the doctor or assistant grasps the handle 30 to perform the femoral neck trial mold removal surgery. The design of the angles α and β changes the control direction and angle of the hook portion 10, allowing the doctor or assistant to operate the hook portion 10 outside the incision (i.e., the incision retaining the intramedullary file), conveniently avoiding other instruments and facilitating operation. Based on the aforementioned angles, to avoid the greater trochanter of the femur 400 and protect soft tissue, the length H of the hook portion 10 can be defined as 15 mm to 100 mm. In this way, the hook portion 10 can bypass the greater trochanter of the femur 400 to protect soft tissue and can be inserted into the groove of the intramedullary file.

[0048] Preferably, the support surface 223 is an arc surface and protrudes toward the first connecting rod 210, so that the pry bar 200 can rotate better when rotating with the support surface 223 as a fulcrum. Specifically, the positioning pin 222 is a cylinder, and the cylindrical surface of the cylinder forms the support surface 223.

[0049] The support surface 223 is not limited to the above-mentioned method. Figures 3 and 4 As shown, in another embodiment, the support surface 223 is provided on the hole wall of the second through hole 221 near the end of the first connecting rod 210. Specifically, the end of the second through hole 221 near the first connecting rod 210 is a closed end, and the surface of the closed end forms the support surface 223. Figure 4 As shown, the surface of the closed end is an arc surface, specifically a semicircular surface, so that the pry bar 200 can rotate better when rotating with the support surface 223 as the fulcrum. Figure 4 and Figure 5 As shown, when performing the femoral neck trial mold removal surgery, the pry bar 200 rests on the above-mentioned semicircular surface and can be rotated with the semicircular surface as a fulcrum to form a lever mechanism feature, and then the muscle can be pulled by the bone hook tool 100, and at the same time, the pry bar 200 is rotated to pry the femoral neck trial mold 500 out of position and remove it through the leverage effect.

[0050] In a preferred embodiment, Figure 1 As shown, Figure 3 As shown, the first through hole 110 and the second through hole 221 are connected as a whole. Figure 1Taking the illustrated embodiment as an example, the second through-hole 221 extends from the second connecting rod 220 to the hook portion 10 along the length of the second connecting rod 220. This allows the pry bar 200 to enter the two through-holes from one side (the left side in the figure) of the bone hook tool 100 and rest against the locating pin 222. This eliminates the need for alignment when the pry bar 200 passes through the two through-holes, making operation more convenient. Furthermore, when the pry bar 200 rotates around the locating pin 222, the side of the pry bar 200 proximal to the femoral neck trial mold 500 is not obstructed by the second connecting rod 220 or the hook portion 10.

[0051] In other embodiments, the first through-hole 110 and the second through-hole 221 are not connected, but are independently provided on the hook portion 10 and the second connecting rod 220. In this case, the position and length of the first through-hole 110 on the hook portion 10, the position and length of the second through-hole 221 on the second connecting rod 220, and the value of the angle β can be comprehensively considered to ensure that the pry bar 200 can pass through the second through-hole 221 and the first through-hole 110 in sequence. It is understood that the angle β should not be too large, so as to prevent the pry bar 200 from passing through the hook portion 10.

[0052] During the femoral neck trial mold removal surgery, the hook portion 10 and the distal end of the pry bar 200 (the end used to pry the femoral neck trial mold 500) can be roughly considered to be in the same plane. In order to ensure that the pry bar 200 has a good force arm support during the process of prying the femoral neck trial mold 500 through the lever action, refer to Figure 7 The distance L between the hook portion 10 and the support surface 223 can be defined as 10 mm to 60 mm. The distance L between the hook portion 10 and the support surface 223 refers to the minimum distance between the surface of the hook portion 10 and the support surface 223. In this way, the distance between the distal end of the pry bar 200 and the fulcrum (i.e., the support surface 223) is moderate, ensuring the length of the pry bar 200 that can be inserted into the hole 501 of the femoral neck trial mold 500, thereby preventing accidental separation of the pry bar 200 from the femoral neck trial mold 500. Furthermore, the angle α between the first connecting rod 210 and the second connecting rod 220 is defined as 30-150 degrees, the angle β between the hook portion 10 and the second connecting rod 220 is defined as 30-150 degrees, and the length H of the hook portion 10 can be defined as 15 mm to 100 mm, ensuring that the hook portion 10 can pass around the greater trochanter of the femur 400 to protect soft tissue and can be inserted into the groove of the intramedullary rasp. The length of the hook portion 10 refers to the minimum distance between the end of the hook clamp 130 and the second connecting rod 220. Through the above-mentioned various means, the requirements of smoothly pulling the intramedullary rasp and prying the femoral neck trial mold 500 can be simultaneously met, ensuring that the femoral neck trial mold surgery can be performed efficiently.

[0053] like Figure 1As shown, the outer side of the place where the hook portion 10 is connected to the second connecting rod 220, that is, the outer side of the second curved portion 240, is also provided with a positioning portion 250 for the pry bar 200 to lean against. When performing a femoral neck trial mold removal operation, the pry bar 200 can still lean against the positioning portion 250, thereby providing more options for the doctor or assistant to use the bone hook tool 100. The positioning portion 250 can specifically be a groove, and the pry bar 200 can be reliably placed in the groove. The positioning portion 250 can also be a friction enhancing structure, such as a friction surface with a certain friction force, which can play a positioning role.

[0054] In the above-described embodiment of the present invention, the support surface 223, serving as a fulcrum, is located within the second through-hole 221. Therefore, the positioning pin 222 is spaced away from the second curved portion 240, and the pry bar 200 passes through both through-holes. In other words, the pry bar 200 passes through the internal passage of the bone hook tool 100. Therefore, the gap between the second curved portion 240 and the femoral neck trial mold 500 is not used to accommodate the pry bar 200. During femoral neck trial mold removal surgery, even if the second curved portion 240 is very close to the femoral neck trial mold 500, it will not affect the operation of the pry bar 200. Therefore, the handle 30 and the first connecting rod 210 can be raised as much as possible, thereby changing the direction of force application to a more horizontal direction compared to the prior art, which is more in line with operator preference and saves more effort. This also resolves the irreconcilable contradiction between the prior art of raising the bone hook tool during operation and the coordinated use of the bone hook tool and the puncture rod.

[0055] refer to Figure 2 One embodiment of the present invention further provides a femoral neck trial mold removal device, comprising the bone hook tool 100 of the above embodiment and a pry bar 200 used in conjunction with the bone hook tool 100.

[0056] When the above-mentioned femoral neck trial mold removal device is used, the pry bar 200 passes through the inside of the bone hook tool 100, and the gap that needs to be reserved between the bone hook tool 100 and the femoral neck trial mold 500 is very small, so that the handle 30 and the first connecting rod 210 of the bone hook tool 100 can be raised as much as possible, and then the force direction is changed, so that the force direction is closer to the horizontal direction than the existing technology, more in line with operating habits, and more labor-saving, thereby solving the irreconcilable contradiction between the prior art of raising the bone hook tool during operation and the coordinated use of the bone hook tool and the puncture rod.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A bone hook tool for use with a pry bar to separate a femoral neck trial from a femur, characterized in that: The bone hook tool comprises: The hook portion is provided with a first through hole penetrating the hook portion; A connecting rod, the connecting rod includes a first connecting rod and a second connecting rod, the two ends of the second connecting rod are respectively connected to the first connecting rod and the hook portion, the hook portion and the first connecting rod extend toward the same side of the second connecting rod, the second connecting rod is provided with a second through hole penetrating the second connecting rod, a support surface is provided in the second through hole, the second through hole and the first through hole together form an internal channel for penetrating the bone hook tool, the internal channel is used to allow the pry bar to pass through to rest against the support surface and be able to rotate with the support surface as a fulcrum.

2. The bone hook tool according to claim 1, characterized in that The supporting surface is an arc surface protruding toward the first connecting rod.

3. The bone hook tool according to claim 2, characterized in that The second connecting rod is provided with a positioning rod, and the cylindrical surface of the positioning rod forms the supporting surface.

4. The bone hook tool according to claim 3, characterized in that The positioning rod is a positioning pin. Along the extension direction of the second through hole, the second connecting rod is provided with a plurality of pin holes detachably connected to the positioning pin, so that the position of the positioning pin on the second connecting rod is adjustable.

5. The bone hook tool according to claim 2, characterized in that The supporting surface is arranged on a hole wall of the second through hole close to one end of the first connecting rod.

6. The bone hook tool according to claim 1, wherein: The first through hole and the second through hole are connected as one body.

7. The bone hook tool according to claim 1, characterized in that A positioning portion for the pry bar to abut against is provided on the outer side of the connection point between the hook portion and the second connecting rod.

8. The bone hook tool according to claim 7, wherein: The positioning portion is a groove or a friction enhancing structure.

9. The bone hook tool according to claim 1, wherein: The included angle between the first connecting rod and the second connecting rod is 30-150 degrees, the included angle between the hook portion and the second connecting rod is 30-150 degrees, and the distance from the support surface to the hook portion is 10mm-60mm.

10. A femoral neck trial mold removal device for separating the femoral neck trial mold from the femur, comprising a bone hook tool and a pry bar used in conjunction with each other: characterized in that: The bone hook tool is the bone hook tool according to any one of claims 1 to 9.

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