Femoral stem extractor

Abstract

The utility model belongs to the technical field of medical instruments, and particularly discloses a femoral stem extractor which comprises a connecting piece, a first clamping block, a second clamping block and a locking piece, the connecting piece is provided with a first connecting arm and a second connecting arm which are connected with each other, the first clamping block is detachably connected with the first connecting arm, and the second clamping block is detachably connected with the second connecting arm. The second clamping block is detachably connected with the second connecting arm; the connecting piece has a folded state and an unfolded state, in the folded state, the first clamping block and the second clamping block define an accommodating cavity for inserting the conical part of the femoral stem, and in the unfolded state, the first clamping block and the second clamping block are far away from each other; the locking piece is connected with the connecting piece and used for limiting the connecting piece to be in the folded state so that the relative positions of the first clamping block and the second clamping block can be kept fixed. The femoral stem extractor disclosed by the utility model can be matched with femoral stems of different models, and is beneficial to reducing the operation difficulty and improving the operation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a femoral stem extraction device. Background Technology

[0002] In hip revision surgery, the femoral stem extractor is an essential tool for removing failed or damaged femoral stem prostheses. Femoral stem extractors are designed and function in various ways to improve surgical efficiency, reduce bone loss, and avoid prosthesis debris. However, due to differences in the taper design of femoral stems produced by different manufacturers, existing femoral stem extractors can only extract the portion of the femoral stem that is compatible with their taper, increasing the difficulty and cost of the surgery and hindering its efficiency. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a femoral stem extraction device that is easily adaptable to different femoral stems, thereby reducing surgical difficulty and improving surgical efficiency.

[0004] The femoral stem extraction device of this utility model includes a connector, a first clamping block, a second clamping block, and a locking member. The connector has a first connecting arm and a second connecting arm that are connected to each other. The first clamping block is detachably connected to the first connecting arm, and the second clamping block is detachably connected to the second connecting arm. The connector has a folded state and an unfolded state. In the folded state, the first clamping block and the second clamping block form a receiving cavity for inserting into the femoral stem cone. In the unfolded state, the first clamping block and the second clamping block are separated from each other. The locking member is connected to the connector and is used to limit the connector to the folded state so that the relative positions of the first clamping block and the second clamping block are fixed.

[0005] It is understood that in this embodiment, the connector is detachably connected to the first clamping block via the first connecting arm and to the second clamping block via the second connecting arm. When the connector is in a folded state, the first and second clamping blocks can close together to form a receiving cavity for inserting the femoral stem cone. After the femoral stem cone is inserted into the receiving cavity, the connector is limited by the locking member to lock the first and second clamping blocks, thereby ensuring that the femoral stem cone is reliably inserted into the receiving cavity, facilitating the removal of the femoral stem through the femoral stem cone. Since both the first and second clamping blocks are detachably connected to the connector, different sizes of receiving cavities can be formed by replacing the first and second clamping blocks to accommodate different femoral stem cones with different tapers, eliminating the need to replace the entire extraction device or change the surgical procedure. This reduces surgical difficulty, increases surgical efficiency, and lowers surgical costs.

[0006] In this embodiment, the first connecting arm includes a first end and a second end, and the second connecting arm includes a third end and a fourth end, wherein the first end and the third end are rotatably connected.

[0007] In this embodiment, the locking member has a connecting hole for hooking surgical instruments.

[0008] In this embodiment, one of the first end and the third end is provided with a protrusion, and the other is provided with a plug groove that matches the protrusion. After the protrusion is inserted into the plug groove, it is rotatably connected by a first hinge shaft.

[0009] In this embodiment, the first clamping block is detachably connected to the second end, and the second clamping block is detachably connected to the fourth end.

[0010] In this embodiment, the first end and the second end are arranged at an angle.

[0011] In this embodiment, the third end and the fourth end are arranged at an angle.

[0012] In this embodiment, the first hinge shaft includes a first bolt and a second bolt. The first bolt has an internal thread and passes through the first connecting arm and the second connecting arm. The second bolt has an external thread and is threadedly connected to the first bolt.

[0013] In this embodiment, one of the first connecting arm and the first clamping block is provided with a first latching protrusion, and the other is provided with a first groove that matches the first latching protrusion, and the first latching protrusion is inserted into the first groove.

[0014] In this embodiment, one of the second connecting arm and the second clamping block is provided with a second latching protrusion, and the other is provided with a second groove that matches the second latching protrusion, with the second latching protrusion inserted into the second groove.

[0015] In this embodiment, the first clamping block has a first slot, and the second clamping block has a second slot. In the folded state, the inner walls of the first slot and the inner walls of the second slot together form the receiving cavity.

[0016] In this embodiment, the receiving cavity includes a tapered section and a straight section. The end of the tapered section with a smaller diameter is adjacent to the straight section, and the diameter of the end of the tapered section with a smaller diameter is larger than the diameter of the straight section.

[0017] In this embodiment, the locking member includes a limiting body and a locking body. The limiting body has a limiting groove. When the connecting member is in the folded state, the connecting member can be inserted into the limiting groove. The locking body is connected to the limiting body. The connecting member has a mating part corresponding to the locking body. The locking body is used to cooperate with the mating part to limit the connecting member when the connecting member is inserted into the limiting groove.

[0018] In this embodiment, the limiting body and the connecting member are rotatably connected by a second hinge shaft, and the locking body and the second hinge shaft are respectively located on opposite sides of the limiting body.

[0019] In this embodiment, the limiting body includes a first plate, a second plate, and a third plate. The first plate and the second plate are arranged in parallel and spaced apart. The third plate is vertically connected to one end of the first plate and the second plate. The first plate, the second plate, and the third plate form the limiting groove.

[0020] In this embodiment, the limiting body is provided with a support member to support the first clamping block and the second clamping block when the connecting member is inserted into the limiting groove.

[0021] In this embodiment, the mating part is a groove.

[0022] In this embodiment, the locking body is threadedly connected to the third plate and penetrates the third plate to abut against the mating part.

[0023] In this embodiment, the support member is formed with a clearance hole so that the femoral stem cone portion can be inserted into the receiving cavity through the clearance hole. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the femoral stem extraction device according to an embodiment of the present invention.

[0025] Figure 2 This is a cross-sectional view of the femoral stem extraction device according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the unfolded structure of the femoral stem extractor according to an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the femoral stem extractor in the state of being connected to the femoral stem, according to an embodiment of the present invention.

[0028] Figure 5 This is a structural schematic diagram of the connector according to an embodiment of the present invention from a first-view perspective.

[0029] Figure 6This is a structural schematic diagram of the connector according to an embodiment of the present invention from a second perspective.

[0030] Figure 7 This is a cross-sectional view of the connector and the first clamping block and the second clamping block in an embodiment of the present utility model.

[0031] Figure 8 This is a perspective view of the first bolt in an embodiment of this utility model.

[0032] Figure 9 This is a cross-sectional view of the first bolt in an embodiment of this utility model.

[0033] Figure 10 This is a perspective view of the second bolt in an embodiment of this utility model.

[0034] Figure 11 This is a perspective view of the first clamping block and the second clamping block according to an embodiment of the present utility model.

[0035] Figure 12 This is a cross-sectional view of the first clamping block and the second clamping block according to an embodiment of the present utility model.

[0036] Figure 13 This is a schematic diagram of the structure of the locking body according to an embodiment of the present invention.

[0037] Figure 14 This is a perspective view of the limiting body according to an embodiment of the present utility model.

[0038] Figure 15 This is a schematic diagram of the structure of the limiting body according to an embodiment of the present utility model.

[0039] Figure 16 This is a cross-sectional view of the limiting body according to an embodiment of the present utility model.

[0040] Figure label:

[0041] 100. Femoral stem; 101. Femoral stem cone;

[0042] 1. Connector; 11. First connecting arm; 111. First groove; 12. Second connecting arm; 121. Second groove; 13. First hinge shaft; 131. First bolt; 132. Second bolt; 14. Mating part;

[0043] 2. First clamping block; 21. First latching protrusion; 22. First slot;

[0044] 3. Second clamping block; 31. Second latching protrusion; 32. Second slot;

[0045] 4. Locking components;

[0046] 41. Limiting body; 411. Limiting groove; 412. First plate; 413. Second plate; 414. Third plate; 4141. Threaded hole; 415. Supporting component; 4151. Clearance hole; 416. Lug; 4161. Connecting hole;

[0047] 42. Locking body; 421. Threaded section; 422. Handle section;

[0048] 5. Receiving cavity; 51. Tapered hole section; 52. Straight hole section;

[0049] 6. Second hinge shaft. Detailed Implementation

[0050] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0051] In this embodiment, as Figures 1-16 As shown, the femoral stem extraction device includes a connector 1, a first clamping block 2, a second clamping block 3, and a locking member 4. The connector 1 has a first connecting arm 11 and a second connecting arm 12 that are connected to each other. The first clamping block 2 is detachably connected to the first connecting arm 11, and the second clamping block 3 is detachably connected to the second connecting arm 12. The connector 1 has a folded state and an unfolded state. In the folded state, the first clamping block 2 and the second clamping block 3 form a receiving cavity 5 for inserting the femoral stem cone portion 101. In the unfolded state, the first clamping block 2 and the second clamping block 3 are separated from each other. The locking member 4 is connected to the connector 1 and is used to limit the connector 1 to the folded state so that the relative positions of the first clamping block 2 and the second clamping block 3 are fixed.

[0052] It should be noted that, in the folded state, the first clamping block 2 and the second clamping block 3 can be close together or spaced apart. The first clamping block 2 and the second clamping block 3 only need to be able to clamp the femoral stem cone 101 within the receiving cavity 5 in the folded state; this is not a limitation. In the unfolded state, the first clamping block 2 and the second clamping block 3 are spaced apart relative to the folded state; the specific distance between the first clamping block 2 and the second clamping block 3 in the unfolded state is not used to limit this invention.

[0053] It is understood that in this embodiment, the connector 1 is detachably connected to the first clamping block 2 via the first connecting arm 11 and to the second clamping block 3 via the second connecting arm 12. When the connector 1 is in a folded state, the first clamping block 2 and the second clamping block 3 can be closed to form a receiving cavity 5 for inserting the femoral stem cone 101. After the femoral stem cone 101 is inserted into the receiving cavity 5, the connector 1 is limited by the locking member 4 to lock the first clamping block 2 and the second clamping block 3 through the connector 1, so that the femoral stem cone 101 can be reliably inserted into the receiving cavity 5, thereby facilitating the removal of the femoral stem 100 through the femoral stem cone 101. Both the first clamping block 2 and the second clamping block 3 are detachably connected to the connector 1. Thus, for different femoral stem cones 101 with different tapers, the first clamping block 2 and the second clamping block 3 can be replaced to form a receiving cavity 5 of different sizes for adaptation. There is no need to replace the entire extractor or change the operation method of the surgery, which helps to reduce the difficulty of the surgery, improve the efficiency of the surgery, and reduce the cost of the surgery.

[0054] In this embodiment, as Figure 1 , Figure 5 and Figure 6 As shown, the first connecting arm 11 includes a first end and a second end, and the second connecting arm 12 includes a third end and a fourth end. The first end of the first connecting arm 11 and the third end of the second connecting arm 12 are rotatably connected.

[0055] It is understood that by rotatably connecting the first end of the first connecting arm 11 and the third end of the second connecting arm 12, the first connecting arm 11 and the second connecting arm 12 can be flipped relative to each other, so that the first connecting arm 11 and the second connecting arm 12 can be folded and unfolded relative to each other, thereby putting the connector 1 in a folded or unfolded state. The second clamping block 3 is connected to the first connecting arm 11 and the second connecting arm 12. Thus, by flipping the first connecting arm 11 and the second connecting arm 12 relative to each other, the relative position between the first clamping block 2 and the second clamping block 3 can be adjusted. When the first connecting arm 11 and the second connecting arm 12 are folded relative to each other, the femoral stem cone 101 can be connected to the receiving cavity 5 formed by the first clamping block 2 and the second clamping block 3. When the first connecting arm 11 and the second connecting arm 12 are unfolded relative to each other, the first clamping block 2 and the second clamping block 3 can be installed, disassembled, and replaced.

[0056] In this embodiment, one of the first end and the third end is provided with a protrusion, and the other end is provided with a matching insertion groove. After the protrusion is inserted into the insertion groove, it is rotatably connected by the first hinge shaft 13.

[0057] When the first end has a protrusion, the third end has a insertion groove. When the first end has a insertion groove, the third end has a protrusion.

[0058] Specifically, when the protrusion is inserted into the insertion slot, the hole on the protrusion corresponds to the hole on the side wall of the insertion slot. The first hinge shaft 13 passes through the hole on the protrusion and the hole on the side wall of the insertion slot, thereby rotatably connecting the first end and the third end together.

[0059] It should be noted that when the first connecting arm 11 and the second connecting arm 12 need to be hinged together via the first hinge shaft 13, the protrusion is inserted into the insertion slot. The insertion slot can limit the protrusion, facilitating the alignment of the connection points of the first connecting arm 11 and the second connecting arm 12. This makes it easier to connect the first connecting arm 11 and the second connecting arm 12 together via the first hinge shaft 13, improving installation efficiency. Furthermore, the sidewall of the insertion slot can also support the protrusion, which helps improve structural strength. The sidewall of the insertion slot can also limit the protrusion, preventing excessive movement of the first connecting arm 11 relative to the second connecting arm 12.

[0060] In this embodiment, the first clamping block 2 is detachably connected to the second end, and the second clamping block 3 is detachably connected to the fourth end.

[0061] It is understandable that by setting the first clamping block 2 at the end of the first connecting arm 11 away from the connection with the second connecting arm 12, and setting the second clamping block 3 at the end of the second connecting arm 12 away from the connection with the first connecting arm 11, the second and fourth ends can move a relatively large distance when the first connecting arm 11 swings at a small angle relative to the second connecting arm 12. This is beneficial for making the structure of the connector 1 more compact, and at the same time, it is convenient for the first clamping block 2 and the second clamping block 3 to fit together or separate.

[0062] In this embodiment, as Figure 5 As shown, the first and second ends of the first connecting arm 11 are set at an angle. The third and fourth ends of the second connecting arm 12 are also set at an angle.

[0063] For example, the included angle between the first end and the second end of the first connecting arm 11 can be an obtuse angle. The included angle between the third end and the fourth end of the second connecting arm 12 can also be an obtuse angle. When the connector 1 is in a folded state, the second end of the first connecting arm 11 can be parallel to the fourth end of the second connecting arm 12, thereby making the first clamping block 2 connected to the second end of the first connecting arm 11 and the second clamping block 3 connected to the fourth end of the second connecting arm 12 parallel to each other. This facilitates the mating surfaces of the first clamping block 2 and the second clamping block 3 to mate, eliminating the need for complex structures on the first clamping block 2 and the second clamping block 3 to make their mating surfaces parallel, thus simplifying the structure of the first clamping block 2 and the second clamping block 3.

[0064] It is understandable that the first end and the second end of the first connecting arm 11 are set at an angle, and the third end and the fourth end of the second connecting arm 12 are set at an angle. By reasonably setting the angle, the overall structure of the connector 1 can be made more compact and space-saving.

[0065] In this embodiment, as Figure 3 and Figures 8-10 As shown, the first hinge shaft 13 includes a first bolt 131 and a second bolt 132. The first bolt 131 has an internal thread and passes through the first connecting arm 11 and the second connecting arm 12. The second bolt 132 has an external thread and is threadedly connected to the first bolt 131.

[0066] Specifically, the first connecting arm 11 is provided with a first hinge hole, and the second connecting arm 12 is provided with a second hinge hole. The first bolt 131 has a shank and a head, and the shank of the first bolt 131 passes through the first hinge hole and the second hinge hole in sequence. The second bolt 132 has a shank and a head, and the shank of the second bolt 132 is threadedly connected to the internal thread of the first bolt 131. One of the heads of the first bolt and the second bolt abuts against the first connecting arm 11, and the other abuts against the second connecting arm 12.

[0067] It is understood that the first hinge shaft 13 includes a first bolt 131 and a second bolt 132. When installing the first hinge shaft 13, the first bolt 131 is passed through the first connecting arm 11 and the second connecting arm 12, and then the second bolt 132 is threaded onto the first bolt 131. Separating the second bolt 132 from the first bolt 131 allows the first connecting arm 11 and the second connecting arm 12 to be separated, which facilitates the installation and disassembly of the first connecting arm 11 and the second connecting arm 12.

[0068] In this embodiment, one of the first connecting arm 11 and the first clamping block 2 is provided with a first locking protrusion 21, and the other is provided with a first groove 111 that matches the first locking protrusion 21. The first locking protrusion 21 is inserted into the first groove 111.

[0069] For example, such as Figure 1 , Figure 6 , Figure 7 and Figure 11As shown, a first groove 111 is provided on the first connecting arm 11, and a first locking protrusion 21 is provided on the first clamping block 2. The first locking protrusion 21 is inserted into the first groove 111 to connect the first clamping block 2 to the first connecting arm 11. Alternatively, the first locking protrusion 21 can be provided on the first connecting arm 11, and the first groove 111 can be provided on the first clamping block 2. The first locking protrusion 21 on the first connecting arm 11 can be inserted into the first groove 111 on the first clamping block 2 to achieve the connection between the first clamping block 2 and the first connecting arm 11. The first locking protrusion 21 can be strip-shaped, and the shapes of the first groove 111 and the first locking protrusion 21 match.

[0070] In this embodiment, the first clamping block 2 and the first connecting arm 11 are connected by inserting the first latching protrusion 21 into the first groove 111, which facilitates the connection and disassembly of the first clamping block 2 and the first connecting arm 11, thereby facilitating the replacement of the first clamping block 2.

[0071] One of the second connecting arm 12 and the second clamping block 3 is provided with a second locking protrusion 31, and the other is provided with a second groove 121 that matches the second locking protrusion 31. The second locking protrusion 31 is inserted into the second groove 121.

[0072] For example, such as Figure 1 , Figure 6 , Figure 7 and Figure 11 As shown, a second groove 121 is provided on the second connecting arm 12, forming the second connecting arm 12. A second latching protrusion 31 is provided on the second clamping block 3, which is inserted into the second groove 121 to connect the second clamping block 3 to the second connecting arm 12. Alternatively, a second latching protrusion 31 can be provided on the second connecting arm 12, and a second groove 121 can be provided on the second clamping block 3, with the second latching protrusion 31 on the second connecting arm 12 inserted into the second groove 121 on the second clamping block 3 to achieve the connection between the second clamping block 3 and the second connecting arm 12. The second latching protrusion 31 can be strip-shaped, and the shapes of the second groove 121 and the second latching protrusion 31 match.

[0073] In this embodiment, the second clamping block 3 and the second connecting arm 12 are connected by inserting the second latching protrusion 31 into the second groove 121, which facilitates the connection and disassembly of the second clamping block 3 and the second connecting arm 12, thereby facilitating the replacement of the second clamping block 3.

[0074] In this embodiment, as Figure 2 , Figure 11 and Figure 12 As shown, the first clamping block 2 has a first slot 22, and the second clamping block 3 has a second slot 32. In the folded state, the inner walls of the first slot 22 and the second slot 32 together form a receiving cavity 5.

[0075] It should be noted that the shapes of the first slot 22 and the second slot 32 are adapted to the femoral stem cone 101. The receiving cavity 5 is formed by the inner walls of the first slot 22 and the second slot 32. When the femoral stem cone 101 is inserted into the receiving cavity 5, the femoral stem cone 101 can open the first clamping block 2 and the second clamping block 3. After the femoral stem cone 101 is moved into place, the femoral stem cone 101 is reliably fixed in the receiving cavity 5 by limiting the first clamping block 2 and the second clamping block 3.

[0076] like Figure 2 and Figure 7 As shown, the receiving cavity 5 can be a stepped hole. The receiving cavity 5 includes a conical hole section 51 and a straight hole section 52. The end of the conical hole section 51 with a smaller diameter is adjacent to the straight hole section 52, and the diameter of the end of the conical hole section 51 with a smaller diameter is larger than the diameter of the straight hole section 52. When the femoral stem cone 101 is inserted into the receiving cavity 5, the femoral stem cone 101 can abut against the stepped surface between the conical hole section 51 and the straight hole section 52. After the connecting member 1 is limited to the folded state by the locking member 4, the femoral stem 100 can be reliably connected to the extractor.

[0077] In this embodiment, as Figure 1 , Figure 2 As shown, the locking member 4 includes a limiting body 41 and a locking body 42. The limiting body 41 has a limiting groove 411. When the connecting member 1 is in the folded state, the connecting member 1 can be inserted into the limiting groove 411. The locking body 42 is connected to the limiting body 41. The connecting member 1 is provided with a mating part 14 corresponding to the locking body 42. The locking body 42 is used to cooperate with the mating part 14 to limit the connecting member 1 when it is inserted into the limiting groove 411.

[0078] Specifically, the shape of the limiting groove 411 can be set according to the shape of the connector 1 in the folded state. Therefore, its specific shape can be set according to actual needs and is not limited here.

[0079] It is understandable that when the connector 1 is inserted into the limiting groove 411, the movement of the connector 1 is restricted by the inner wall of the limiting groove 411. After the femoral stem cone 101 is inserted into the receiving cavity 5, the connector 1 can be limited to a folded state by the cooperation of the locking body 42 and the mating part 14 on the connector 1.

[0080] In this embodiment, as Figure 1 and Figure 2 As shown, the locking body 42 passes through the side wall of the limiting groove 411 and is threadedly connected to the side wall of the limiting groove 411. The mating part 14 is a groove.

[0081] Specifically, such as Figure 1 , Figure 2 and Figure 13As shown, the locking body 42 includes a threaded section 421 and a handle section 422 connected to each other. A threaded hole 4141 is provided on the side wall of the limiting groove 411. The locking body 42 and the side wall of the limiting groove 411 are threadedly connected by the threaded section 421 and the threaded hole 4141. A mating part 14 is provided on the side wall of the connecting member 1. When the locking body 42 is tightened by the handle section 422, the threaded section 421 of the locking body 42 abuts against the mating part 14, applying pressure to the connecting member 1 to make the first clamping block 2 and the second clamping block 3 fit tightly together, thereby reliably fixing the femoral stem cone 101 in the receiving cavity 5. When the locking body 42 is loosened, the threaded section 421 moves away from the connecting member 1, allowing the connecting member 1 to unfold, thereby separating the first clamping block 2 and the second clamping block 3 to remove the femoral stem cone 101 from the receiving cavity 5.

[0082] It is understandable that when it is necessary to limit the connection 1, the locking body 42 is tightened to abut against the mating part 14, and when it is necessary to loosen the connection 1, the locking body 42 is loosened and moved out of the mating part 14. This makes it easier to limit or loosen the connection 1, which is beneficial to improving surgical efficiency.

[0083] In this embodiment, as Figure 1 As shown, the limiting body 41 and the connecting piece 1 are hinged together by the second hinge shaft 6, and the locking body 42 and the second hinge shaft 6 are respectively located on opposite sides of the limiting body 41.

[0084] Specifically, the structure of the second hinge shaft 6 is the same as that of the first hinge shaft 13, and the specific structure of the second hinge shaft 6 will not be described in detail here. One of the second connecting arms 12 and the first connecting arm 11, with its end facing away from the first hinge shaft 13, is hinged to the limiting body 41 through the second hinge shaft 6. The one not connected to the limiting body 41 can rotate around the second hinge shaft 6 and enter the limiting groove 411 in the folded state under the drive of the one hinged to the limiting body 41 through the second hinge shaft 6.

[0085] It is understood that in this embodiment, the connecting member 1 and the limiting body 41 are hinged together by the second hinge shaft 6. Limiting and releasing the connecting member 1 does not require separating the connecting member 1 from the limiting body 41, making the operation more convenient and thus improving surgical efficiency. Furthermore, placing the locking body 42 and the second hinge shaft 6 on opposite sides of the limiting body 41 facilitates limiting the other end of the connecting member 1 via the locking body 42, simplifying the structure of the limiting body 41.

[0086] like Figure 2 , Figure 3 and Figures 14-16As shown, the limiting body 41 includes a first plate 412, a second plate 413, and a third plate 414. The first plate 412 and the second plate 413 are arranged parallel to each other and spaced apart. The third plate 414 is vertically connected to one end of the first plate 412 and the second plate 413. The first plate 412, the second plate 413, and the third plate 414 form a limiting groove 411. Specifically, the first connecting arm 11 or the second connecting arm 12 is connected to the end of the first plate 412 or the second plate 413 opposite to the third plate 414 via the second hinge shaft 6. The locking body 42 is disposed on the third plate 414. Specifically, a threaded hole 4141 is disposed on the third plate 414, and the locking body 42 is threadedly connected to the threaded hole 4141.

[0087] In this embodiment, as Figures 14-16 As shown, the limiting body 41 is provided with a support member 415 to support the first clamping block 2 and the second clamping block 3 when the connecting member 1 is inserted into the limiting groove 411.

[0088] Specifically, both the first plate 412 and the second plate 413 are connected to the support member 415. The support member 415 is located at the end of the limiting body 41 opposite to the entry and exit of the connecting member 1. The support member 415 is formed with a clearance hole 4151 so that the femoral stem cone portion 101 can be inserted into the receiving cavity 5 through the clearance hole 4151. For example, the support member 415 can be plate-shaped, with a simple structure and easy processing.

[0089] It should be noted that when the first clamping block 2 and the connecting piece 1 are connected by the cooperation of the first latching protrusion 21 and the first groove 111, and the second clamping block 3 and the connecting piece 1 are connected by the cooperation of the second latching protrusion 31 and the second groove 121, the first clamping block 2 and the second clamping block 3 can be prevented from detaching from the connecting piece 1 by setting the supporting piece 415 to support the first clamping block 2 and the second clamping block 3.

[0090] In this embodiment, as Figure 1 As shown, the locking member 4 has a connecting hole 4161 for hooking a surgical hook.

[0091] Specifically, such as Figure 1 As shown, the third plate 413 has a lug 416 on the side opposite to the limiting groove 411, and a connecting hole 4161 is provided on the lug 416.

[0092] Understandably, by providing a lug 416 on the locking member 4 and a connecting hole 4161 on the lug 416, the surgical hook is hung in the connecting hole 4161 as a force point during the operation to facilitate the removal of the femoral stem 100.

[0093] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0094] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0095] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0096] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0097] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0098] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A femoral stem extraction device, characterized in that, include: A connector having a first connecting arm and a second connecting arm that are connected to each other; A first clamping block and a second clamping block, wherein the first clamping block is detachably connected to the first connecting arm and the second clamping block is detachably connected to the second connecting arm; The connector has a folded state and an unfolded state. In the folded state, the first clamping block and the second clamping block form a receiving cavity for inserting into the femoral stem cone. In the unfolded state, the first clamping block and the second clamping block are far apart from each other. A locking member is connected to the connecting member, and the locking member is used to limit the connecting member to the folded state so that the relative positions of the first clamping block and the second clamping block are fixed.

2. The femoral stem extraction device according to claim 1, characterized in that, The first connecting arm includes a first end and a second end, and the second connecting arm includes a third end and a fourth end, wherein the first end and the third end are rotatably connected. And / or, the locking member has a connection hole for hooking surgical instruments.

3. The femoral stem extraction device according to claim 2, characterized in that, One of the first end and the third end is provided with a protrusion, and the other is provided with a plug groove that matches the protrusion. After the protrusion is inserted into the plug groove, it is rotatably connected by a first hinge shaft. And / or, the first clamping block is detachably connected to the second end, and the second clamping block is detachably connected to the fourth end; And / or, the first end and the second end are set at an angle; And / or, the third end and the fourth end are arranged at an angle.

4. The femoral stem extraction device according to claim 3, characterized in that, The first hinge shaft includes: A first bolt, the first bolt having internal threads, the first bolt passing through the first connecting arm and the second connecting arm; The second bolt has external threads and is threadedly connected to the first bolt.

5. The femoral stem extraction device according to claim 1, characterized in that, One of the first connecting arm and the first clamping block is provided with a first latching protrusion, and the other is provided with a first groove that matches the first latching protrusion. The first latching protrusion is inserted into the first groove. And / or, one of the second connecting arm and the second clamping block is provided with a second latching protrusion, and the other is provided with a second groove that matches the second latching protrusion, the second latching protrusion being inserted into the second groove.

6. The femoral stem extraction device according to claim 1, characterized in that, The first clamping block has a first slot, and the second clamping block has a second slot. In the folded state, the inner walls of the first slot and the inner walls of the second slot together form the receiving cavity. And / or, the receiving cavity includes a tapered section and a straight section, wherein the end of the tapered section with a smaller diameter is adjacent to the straight section, and the diameter of the end of the tapered section with a smaller diameter is larger than the diameter of the straight section.

7. The femoral stem extraction device according to claim 1, characterized in that, The locking element includes: The limiting body has a limiting groove, and when the connecting member is in the folded state, the connecting member can be inserted into the limiting groove; A locking body is connected to the limiting body. The connecting member has a mating part corresponding to the locking body. The locking body is used to cooperate with the mating part to limit the connecting member when the connecting member is inserted into the limiting groove.

8. The femoral stem extraction device according to claim 7, characterized in that, The limiting body and the connecting member are rotatably connected via a second hinge shaft, and the locking body and the second hinge shaft are respectively located on opposite sides of the limiting body; And / or, the limiting body includes a first plate, a second plate and a third plate, the first plate and the second plate are arranged in parallel and spaced apart, the third plate is vertically connected to one end of the first plate and the second plate, and the first plate, the second plate and the third plate form the limiting groove; And / or, the limiting body is provided with a support to support the first clamping block and the second clamping block when the connector is inserted into the limiting groove; And / or, the mating part is a groove.

9. The femoral stem extraction device according to claim 8, characterized in that, The locking body is threadedly connected to the third plate and penetrates the third plate to abut against the mating part.

10. The femoral stem extraction device according to claim 8, characterized in that, The support member is formed with a clearance hole so that the femoral stem cone portion can be inserted into the receiving cavity through the clearance hole.

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