Single Needle Bone Holder

Abstract

The present invention relates to the technical field of medical devices, and specifically to a single-needle bone holder. The single-needle bone holder comprises a handle and a bone holder needle. The front end of the bone holder needle has a conical needle tip. The handle has a through hole. The front end of the through hole is fixedly connected with a sleeve. The bone holder needle is inserted into the through hole and the sleeve. The front end of the sleeve has an external thread. The needle tip of the bone holder needle has a self-tapping screw. The spiral direction of the external thread is opposite to that of the self-tapping screw. The handle has a locking device for fixing the bone holder needle. The single-needle bone holder has a simple structure, is easy to use, and has strong directional adaptability. It can be used to clamp bone fragments and is suitable for use in narrow spaces.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to a single-needle bone holder. Background Art

[0002] A bone holder is a surgical instrument used for clamping bones and fixing and reducing limb fractures during orthopedic surgery. Most existing bone holders use claw hooks or clamp-type structures. For example, Chinese Patent 2016201066871 discloses a "bone holder" that uses left and right clamping claws to form a clamp-type clamping mechanism to clamp bones. Although this clamp-type bone holder has a fast clamping action, since the clamping claws clamp on the edge of the bone, a larger operating space is required during surgery. In addition, since the clamp body and the handle are directional, it is very difficult to adjust and rotate the direction of the bone during surgery, and sometimes it takes multiple hand-overs to adjust it into place. In addition, due to the lack of a clampable part, this clamp-type bone holder cannot be used to clamp bone fragments. Summary of the invention

[0003] The purpose of the present invention is to provide a single-needle bone holder which has a simple structure, is easy to use, has strong directional adaptability and can be used to clamp bone fragments.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] The single-needle bone holder of the present invention comprises a handle and a bone holding needle. The front end of the bone holding needle has a conical needle tip. The handle has a through hole. The front end of the through hole is fixedly connected to a sleeve. The bone holding needle is inserted into the through hole and the sleeve. The front end of the sleeve has an external thread. The needle tip of the bone holding needle has a self-tapping thread. The spiral direction of the external thread is opposite to the spiral direction of the self-tapping thread. The handle has a locking device for fixing the bone holding needle.

[0006] An annular boss is arranged on the outer wall of the sleeve at the end of the external thread.

[0007] The handle is a columnar structure, and the through hole for inserting the bone holding needle is located on the axis of the handle. The locking device includes a positioning hole arranged on the side wall of the handle and a positioning screw installed in the positioning hole. The positioning hole extends radially along the handle, and its inner end is connected to the through hole. The positioning hole is provided with an internal thread and the positioning screw is installed through the internal thread.

[0008] The handle is a columnar structure, and the through hole for inserting the bone holding needle is located on the axis of the handle. The locking device includes a positioning hole arranged on the side wall of the handle and a slider and a cam installed in the positioning hole. The positioning hole extends along the radial direction of the handle, and its inner end is connected to the through hole. The cam is rotatably installed on the outer end of the positioning hole through an axle, and the slider is slidably installed on the inner end of the positioning hole.

[0009] Due to the adoption of the above structure, the single-needle bone holder has a simple structure, is easy to use, has strong directional adaptability, can be used to clamp bone fragments, and is suitable for use in narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0011] Figure 2 Schematic diagram of the structure of the handle and the locking device in another embodiment. DETAILED DESCRIPTION

[0012] like Figure 1 As shown, the single-needle bone holder of the present invention includes a handle 1 and a bone holding needle 2. The front end of the bone holding needle 2 has a conical needle tip. The handle 1 has a through hole. The front end of the through hole is fixedly connected to a sleeve 3. The end of the sleeve 3 is fixedly connected to the front end of the handle 1, and the inner cavity of the sleeve 3 is connected to the through hole and located on the same straight line. The bone holding needle 2 is inserted into the through hole and the sleeve 3. The through hole penetrates the handle 1 so that the rear end of the bone holding needle 2 can extend to the outside of the through hole. The front end of the sleeve 3 has an external thread 4. The tip of the bone holding needle 2 has a self-tapping thread 5. The spiral direction of the external thread 4 is opposite to that of the self-tapping thread 5. The handle 1 has a locking device for fixing the bone holding needle 2. Figure 1 As shown, when in use, first drill a hole on the proximal bone wall 11 of the bone to be clamped, the diameter of the hole should be able to pass through the bone holding needle 2 but smaller than the outer diameter of the sleeve 3, then insert the front end of the bone holding needle 2 into the hole on the proximal bone wall 11, and pierce the needle tip into the distal bone wall 12, rotate the bone holding needle 2 to screw the needle tip of the bone holding needle 2 into the distal bone wall 12 through self-tapping; then insert the sleeve 3 into the tail end of the bone holding needle 2, slide the sleeve 3 until the external thread 4 at its front end contacts the proximal bone wall 11, press the handle 1 and rotate it, screw the external thread 4 into the hole on the proximal bone wall 11, and finally lock the handle 1 and the bone holding needle 2 through the locking device. In addition, in order to facilitate the external thread 4 to be screwed into the proximal bone wall 11, after drilling the hole on the proximal bone wall 11, a reamer can be used to appropriately expand the hole on the proximal bone wall 11, or a tapping can be used to tap the internal thread of the matching external thread 4. After locking the bone holding needle 2, the relative position of the sleeve 3 and the bone holding needle 2 is fixed and cannot slide, which is equivalent to using the two fixed points of the external thread 4 and the self-tapping thread 5 to fix the position of the bone to be clamped. In addition, since the spiral directions of the external thread 4 and the self-tapping thread 5 are opposite, the bone to be clamped is not easy to displace and rotate after locking, and the clamping is firm. The holding angle can be easily adjusted, and it is easy to use during surgery.

[0013] As a further improvement of the present invention, an annular boss 7 is provided on the outer wall of the sleeve 3 and at the end of the external thread 4. After the external thread 4 is screwed into the hole of the proximal bone wall 11, the annular boss 7 forms a clamping fit with the outer wall of the proximal bone wall 11, so that the sleeve 3 and the proximal bone wall 11 are more closely matched.

[0014] like Figure 1 In the embodiment, the handle 1 is a columnar structure, and the through hole for inserting the bone holding needle 2 is located on the axis of the handle 1. The locking device includes a positioning hole arranged on the side wall of the handle 1 and a positioning screw 6 installed in the positioning hole. The positioning hole extends radially along the handle 1, and its inner end is connected to the through hole. The positioning hole is provided with an internal thread and the positioning screw 6 is installed through the internal thread. When the positioning screw 6 is screwed outward, the bone holding needle 2 can slide freely in the through hole. When locking, the position of the bone holding needle 2 can be locked by screwing the positioning screw 6 inward so that the inner end of the positioning screw 6 presses the bone holding needle 2. In order to facilitate the rotation of the positioning screw 6, two symmetrically arranged blades are fixedly connected to the outer end of the positioning screw 6, and the positioning screw 6 can be driven to rotate by rotating the blades by hand.

[0015] like Figure 2 In the embodiment, the handle 1 is a columnar structure, and the through hole for inserting the bone needle 2 is located on the axis of the handle 1. The locking device includes a positioning hole set on the side wall of the handle 1 and a slider 8 and a cam 9 installed in the positioning hole. The positioning hole extends along the radial direction of the handle 1, and its inner end is connected to the through hole. The cam 9 is rotatably installed at the outer end of the positioning hole through an axle, and the slider 8 is slidably installed at the inner end of the positioning hole. The cross section of the slider 8 can be circular or square. The inner end face of the slider 8 has an arc-shaped groove matching the side wall of the bone needle 2. The outer end face of the slider 8 has a groove matching the cam 9 so that the slider 8 is controlled by the cam 9. The cam 9 is a cylindrical structure. The axles at both ends of the cam 9 are located at the eccentric position of its circular end face. The axle is rotatably installed on the side wall of the positioning hole. The axes of the cam 9 and the axle are perpendicular to the through hole. A wrench 10 is fixedly connected to the cam 9. When in use, moving the wrench 10 can make the cam 9 rotate, and the cam 9 pushes the slider 8 to move, thereby squeezing the bone holding needle 2 in the through hole. When the slider 8 squeezes the bone holding needle 2, the bone holding needle 2 can be locked, otherwise the bone holding needle 2 is released so that it can move freely.

Claims

1. A single-needle bone holder, comprising a handle (1) and a bone holder needle (2), wherein the front end of the bone holder needle (2) has a conical needle tip, and is characterized in that: The handle (1) is provided with a through hole, the front end of which is fixedly connected with a sleeve (3), the bone holding needle (2) is inserted into the through hole and the sleeve (3), the through hole passes through the handle (1) so that the rear end of the bone holding needle (2) extends outside the through hole, the front end of the sleeve (3) is provided with an external thread (4), the external thread (4) is used to be screwed into the hole on the proximal bone wall, and an annular boss (7) is provided on the outer wall of the sleeve (3) and at the end of the external thread (4); the tip of the bone holding needle (2) is provided with a self-tapping thread (5), the spiral direction of the external thread (4) is consistent with the self-tapping thread ( 5), the handle (1) is provided with a locking device for fixing the bone holding needle (2); the handle (1) is a columnar structure, the through hole for inserting the bone holding needle (2) is located on the axis of the handle (1), the locking device comprises a positioning hole arranged on the side wall of the handle (1) and a slider (8) and a cam (9) installed in the positioning hole, the positioning hole extends along the radial direction of the handle (1), and its inner end is connected to the through hole, the cam (9) is rotatably installed at the outer end of the positioning hole through the wheel shaft, and the slider (8) is slidably installed at the inner end of the positioning hole.

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