Bone taking device with multiple anchoring points

Abstract

A multi-anchoring-point bone taking device comprises a sleeve, a movable channel is formed in the sleeve, a plurality of fins are arranged at an opening in one end of the movable channel in the axial direction in an extending mode, the fins can provide more taking-out anchoring points in femoral head and neck sclerotin, the control force during taking-out is greatly improved, and the femoral head can be taken out more stably, easily and conveniently. Therefore, the operation time is reduced. A first handle is arranged at the other end of the movable channel; the bone taking device further comprises a bone taking device, the bone taking device comprises a rod body matched with the movable channel, a conical part is arranged at the end, close to the wing piece, of the rod body, the other end of the rod body extends in the radial direction of the rod body to form a second handle, and when the second handle is attached to the first handle, the conical part is partially exposed out of the sleeve and drills into the femoral bone, and the bone taking device is embedded. The femoral head screw-out device is simple in structure, convenient to operate and capable of effectively reducing the difficulty of taking out the femoral head.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a bone harvesting device with multiple anchor points. Background Technology

[0002] In current medical practice, doctors commonly use a spiral-shaped bone harvesting device, which is forcefully rotated into the cancellous bone of the femoral head to remove it. To stabilize the femoral head and prevent rotation, doctors often need to forcefully tap the harvesting device or use Kirschner wires to temporarily fix the femoral head. However, this procedure carries certain risks and may cause accidental injury to both the patient and the surgeon. Especially when encountering femoral head necrosis or residual femoral head after osteotomy, the harvesting device may struggle to find a suitable and stable anchor point, making it difficult to successfully remove the osteotomized femoral head. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a bone harvesting device with multiple anchoring points.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A bone harvesting device with multiple anchor points, including

[0006] A sleeve, having an internal movable channel, with several fins extending axially from an opening at one end of the movable channel, and a first handle at the other end; and

[0007] The bone harvester includes a rod adapted to the movable channel. One end of the rod near the wing is provided with a cone, and the other end extends radially therewith with a second handle. When the first handle abuts against the second handle, the cone is exposed outside the sleeve.

[0008] During bone harvesting, the wing of the sleeve is first driven into the femoral head and neck bone, and then the bone harvesting device is screwed in along the movable channel until the first handle abuts against the second handle, and the bone harvesting device is drilled into the femoral head.

[0009] The bottom of the second handle is provided with a limiting hole, and the top of the first handle is provided with a mounting hole corresponding to the limiting hole. An anti-rotation device is provided in the mounting hole. When the second handle drives the limiting hole to rotate to be coaxial with the mounting hole, the anti-rotation device is engaged in the limiting hole.

[0010] Furthermore, the anti-rotation device includes a snap-fit ​​component, which is movably connected to the mounting hole. An elastic element is connected between the snap-fit ​​component and the mounting hole. A limiting protrusion is arranged circumferentially on the snap-fit ​​component. A limiting element is provided at the opening of the mounting hole, and the limiting protrusion abuts against the end of the limiting element near the elastic element.

[0011] Furthermore, the end of the snap-fit ​​component exposed outside the limiting component has an outwardly protruding arc-shaped structure.

[0012] Furthermore, the outer periphery of the rod is provided with an external thread, and the movable channel is provided with an internal thread that is adapted to the external thread.

[0013] Furthermore, the outer periphery of the cone is provided with a guide thread, and the guide thread is spaced at the same distance from the external thread.

[0014] Furthermore, it includes at least three blades, each blade being equidistantly distributed along the circumferential direction of the sleeve.

[0015] Furthermore, the edge of the wing is provided with several barbs.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model proposes a multi-anchor point bone harvesting device, comprising a sleeve with a movable channel inside. Several winglets extend axially from the opening at one end of the movable channel. These winglets provide more anchor points within the femoral head and neck bone, significantly improving control during harvesting and enabling more stable and convenient removal of the femoral head, thereby reducing surgical time. A first handle is located at the other end of the movable channel. The device also includes a bone harvesting tool, which comprises a rod adapted to the movable channel. A cone-shaped portion is located at one end of the rod near the winglets, and a second handle extends radially from the other end. When the second handle aligns with the first handle, the cone-shaped portion protrudes from the sleeve and penetrates the femoral head, completing the bone harvesting tool's embedding. Finally, pulling the bone harvesting device outward completes the unscrewing of the femoral head. Its structure is simple, its operation convenient, and it effectively reduces the difficulty of femoral head removal.

[0018] 2. The bone retrieval device with multiple anchor points proposed in this utility model also includes an anti-rotation device to prevent the bone retrieval instrument from rotating in the opposite direction due to impact during the bone retrieval process, causing it to deviate from the sleeve or separate from the femoral head, thus ensuring stable and reliable bone retrieval. The first handle and the second handle are respectively provided with mounting holes and limiting holes at corresponding positions. An anti-rotation device is provided in the mounting hole, which includes a snap-fit ​​component, an elastic component, and a limiting component. The limiting component is located at the opening of the mounting hole to prevent the snap-fit ​​component from completely detaching from the mounting hole during operation.

[0019] 3. The bone harvesting device with multiple anchor points proposed in this utility model has an external thread on the outside of the rod and an internal thread in the movable channel of the sleeve that is compatible with the external thread. The cooperation between the internal and external threads can reduce the time and labor cost required to drill into the bone, while reducing errors in the bone harvesting process and improving the accuracy of bone harvesting.

[0020] 4. The bone harvesting device with multiple anchor points proposed in this utility model has a guide thread on the outer periphery of the cone, which can effectively improve the stability and reliability of the connection, avoid loosening of the connection between the femoral head and the cone, and at the same time improve the guidance of the cone into the femoral head and facilitate embedding into the target femoral head. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a multi-anchor point bone harvesting device according to the present invention;

[0023] Figure 2 This is an exploded view of a multi-anchor point bone harvesting device according to the present invention;

[0024] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 for Figure 2 A magnified view of a section at point B in the middle;

[0026] Figure 5 This is a top view of a bone harvesting device with multiple anchor points according to the present invention;

[0027] Figure 6 for Figure 5 Sectional view along the AA direction

[0028] Figure 7 for Figure 6 A magnified view of a section at point C;

[0029] Figure 8 for Figure 7 A magnified view of a section at point D;

[0030] In the diagram, 10 is the sleeve; 101 is the wing; 1011 is the barb; 102 is the first handle; 103 is the mounting hole; 104 is the internal thread; 20 is the bone extractor; 201 is the rod; 202 is the cone; 2021 is the guide thread; 203 is the second handle; 204 is the external thread; 205 is the limiting hole; 30 is the anti-spinning device; 301 is the elastic element; 302 is the snap-fit ​​element; 3022 is the limiting protrusion; 303 is the limiting element; and 304 is the connecting part. Detailed Implementation

[0031] The following is combined Figures 1 to 8 This utility model will be described in detail.

[0032] A bone harvesting device with multiple anchor points, such as Figures 1 to 4 As shown, the device includes a sleeve 10 with an internal movable channel. Several winglets 101 extend axially from the opening at one end of the movable channel, and a first handle 102 is provided at the other end. It also includes a bone harvester 20, comprising a rod 201 movably fitted within the sleeve 10. One end of the rod 201 near the winglets 101 has a conical portion 202, and the other end has a second handle 203. When the second handle 203 is engaged with the first handle 102, the conical portion 202 is partially exposed outside the sleeve 10. The winglets 101 insert into the bone surface of the femoral head, preventing rotation of the femoral head and providing more anchoring points for its removal. During hip replacement surgery, after successful osteotomy of the femoral neck, the osteotomy surface is exposed. Centered on the osteotomy surface, the wing 101 of the sleeve 10 is first driven into the femoral head and neck bone to fix the sleeve 10 in the target position. Then, the bone harvester 20 is screwed in along the movable channel of the sleeve 10 until the first handle 102 abuts against the second handle 203. At this point, the cone 202 of the bone harvester 20 is embedded in the bone. The femoral head can be removed by pulling the bone harvester outward. The length of the bone harvester 20 is not shorter than the length of the sleeve 10, so that when the first handle 102 and the second handle 203 are tightly fitted, the cone 202 is partially exposed outside the sleeve 10 and embedded in the bone, providing a stable connection force between the femoral head and the bone harvester, preventing the bone from falling out during the removal process.

[0033] In this embodiment, the bottom of the second handle 203 is provided with a limiting hole 205, and the top of the first handle 102 is provided with a mounting hole 103. An anti-rotation device 30 is provided inside the mounting hole 103. When the limiting hole 205 is rotated to be coaxial with the mounting hole 103, the anti-rotation device 30 is engaged within the limiting hole 205. Specifically, as shown... Figures 5 to 8 As shown, the anti-rotation device 30 includes a snap-fit ​​member 302, which is movable inside and outside the mounting hole 103. An elastic member 301 connects the snap-fit ​​member 302 to the mounting hole 103. A limiting protrusion 3022 is also provided on the outer periphery of the snap-fit ​​member 302. The anti-rotation device 30 also includes a limiting member 303, which is disposed at the opening of the mounting hole 103. The limiting protrusion 3022 abuts against the side of the limiting member 303 away from the opening of the mounting hole 103, so that the end of the snap-fit ​​member 302 away from the limiting protrusion 3022 can move outside the mounting hole 103 to prevent the entire snap-fit ​​member 302 from falling out of the mounting hole 103.

[0034] In this embodiment, the end of the snap-fit ​​member 302 exposed outside the limiting member 303 has an outwardly protruding arc-shaped structure, allowing the snap-fit ​​member 302 to move smoothly within the mounting hole 103 and the limiting hole 205 as the second handle 203 rotates. Furthermore, the end of the snap-fit ​​member 302 near the elastic member 301 has a connecting portion 304. One end of the elastic member 301 is fitted onto the outer periphery of the connecting portion 304 and abuts against the bottom of the limiting protrusion 3022, while the other end abuts against the bottom of the mounting hole 103, ensuring a sufficiently stable snap-fit ​​engagement between the snap-fit ​​member 302 and the elastic member 301. During the rotation of the bone harvester 20, when the second handle 203 rotates to the appropriate position, i.e., when the bone harvester 20 is fully embedded, the limiting hole 205 is coaxial with the mounting hole 103. The snap-fit ​​part 302 in the mounting hole 103 enters the limiting hole 205, fixing the first handle 102 and the second handle 203 to prevent the bone harvester 20 from rotating in the opposite direction and to avoid positional displacement between the bone harvester 20 and the sleeve 10 during bone harvesting. When bone harvesting is complete and it is necessary to separate the bone harvester 20 from the sleeve 10, the bone harvester 20 is rotated in the opposite direction, causing the elastic element 301 to compress and deform, and the limiting protrusion 3022 to leave the limiting element 303 until the snap-fit ​​part 302 leaves the limiting hole 205 and enters the mounting hole 103. Then the elastic element 301 returns to its original state, and the limiting protrusion 3022 abuts against the limiting element 303 again. The position of the limiting hole 205 can be pre-manufactured according to requirements to ensure that when the first handle 102 and the second handle 203 are in close contact, the limiting hole 205 can be coaxial with the mounting hole 103.

[0035] In this embodiment, the outer periphery of the rod 201 is provided with an external thread 204, and the movable channel is provided with an internal thread 104 adapted to the external thread 204, so that the bone harvester 20 can better embed into the bone during the screwing process, reducing the force required for the bone harvester 20 to drill into the femoral head. When the external thread 204 on the outer periphery of the rod 201 is an outwardly protruding thread, the internal thread 104 of the movable channel is a threaded groove. The size of the movable channel meets the movement of the entire rod 201 within the movable channel. The rod 201 with the external thread 204 can move along the movable channel to the end away from the first handle 102. The end of the cone 202 is a pointed tip, which facilitates the cone 202 to drill into the femoral head. The outer periphery of the cone 202 extends with a guide thread 2021, and there is a smooth transition between the pointed tip and the guide thread 2021. As the bone harvester 20 is continuously screwed into the femoral head, the fixing force of the cone 202 on the femoral head becomes stronger and stronger, ensuring the stability of the femoral head removal process. The guide thread 2021 and the external thread 204 are spaced equally, so that when the bone harvester 20 is screwed into the movable channel along the internal thread 104, the cone 202 can be screwed into the femoral head accordingly.

[0036] In this embodiment, the sleeve 10 extends with three flaps 101, each flap 101 being equidistantly distributed along the circumferential direction of the sleeve 10. The edges of the flaps 101 are provided with several barbs 1011 to further prevent rotation of the femoral head, ensuring a sufficiently tight connection between the femoral head and the cone 202, and preventing the femoral head from falling off the bone harvester 20 during bone removal. In some embodiments, the number of flaps 101 can be set according to actual needs, and the number is not less than two.

[0037] In this embodiment, the sleeve 10 and the bone harvester 20 are made of metal. The length of the second handle 203 ranges from 8cm to 18cm, the length of the rod 201 ranges from 20cm to 40cm, the diameter of the rod 201 ranges from 1cm to 2cm, the length of the cone 202 ranges from 3cm to 6cm, the length of the first handle 102 ranges from 3cm to 5cm, the length of the wing 101 ranges from 1cm to 5cm, the thickness of the sleeve 10 ranges from 1cm to 3cm, and the opening diameter of the movable channel inside the sleeve 10 ranges from 1cm to 2cm. The length of the wing 101 is slightly shorter than the length of the cone 202, so that when the first handle 102 and the second handle 203 are in contact, the cone 202 portion can be exposed outside the wing. Specifically, the second handle 203 is 10cm long, the rod 201 is 30cm long, the diameter of the rod 201 is 1.5cm, the cone 202 is 4cm long, the first handle 102 is 4cm long, the wing 101 is 3cm long, the sleeve 10 is 2cm thick, and the opening diameter of the movable channel inside the sleeve 10 is 1.8cm.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A bone harvesting device with multiple anchor points, characterized in that, include: A sleeve, having an internal movable channel, with several fins extending axially from an opening at one end of the movable channel, and a first handle at the other end; and The bone harvester includes a rod adapted to the movable channel. One end of the rod near the wing is provided with a cone, and the other end extends radially therewith with a second handle. When the first handle abuts against the second handle, the cone is exposed outside the sleeve. During bone harvesting, the wing of the sleeve is first driven into the femoral head and neck bone, and then the bone harvesting device is screwed in along the movable channel until the first handle abuts against the second handle, and the bone harvesting device is drilled into the femoral head.

2. The bone harvesting device with multiple anchor points as described in claim 1, characterized in that, The bottom of the second handle is provided with a limiting hole, and the top of the first handle is provided with a mounting hole corresponding to the limiting hole. An anti-rotation device is provided in the mounting hole. When the second handle drives the limiting hole to rotate to be coaxial with the mounting hole, the anti-rotation device is engaged in the limiting hole.

3. The bone harvesting device with multiple anchor points as described in claim 2, characterized in that, The anti-rotation device includes a snap-fit ​​component, which is movably connected to the mounting hole. An elastic element is connected between the snap-fit ​​component and the mounting hole. A limiting protrusion is arranged circumferentially on the snap-fit ​​component. A limiting element is provided at the opening of the mounting hole, and the limiting protrusion abuts against the end of the limiting element near the elastic element.

4. The bone harvesting device with multiple anchor points as described in claim 3, characterized in that, The end of the snap-fit ​​component exposed outside the limiting component has an outwardly protruding arc-shaped structure.

5. The bone harvesting device with multiple anchor points as described in claim 4, characterized in that, The outer periphery of the rod is provided with an external thread, and the movable channel is provided with an internal thread that is adapted to the external thread.

6. The bone harvesting device with multiple anchor points as described in claim 5, characterized in that, The outer periphery of the cone is provided with a guide thread, and the guide thread is spaced at the same distance from the external thread.

7. The bone harvesting device with multiple anchor points as described in claim 6, characterized in that, It includes at least three blades, each blade being equidistantly distributed along the circumferential direction of the sleeve.

8. The bone harvesting device with multiple anchor points as described in claim 7, characterized in that, The edge of the wing is provided with several barbs.

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