Bone nail positioning reference element

Abstract

The utility model discloses a bone nail positioning reference element which comprises a support and a tracer, and the two ends of the support are connected with a bone nail and the tracer respectively. The support and the bone nail abut against each other in the axial direction, one of the support and the bone nail is provided with a limiting edge, the other one of the support and the bone nail is provided with a limiting groove where the limiting edge is inserted in a matched mode, and when the limiting edge is matched with the limiting groove, the support forms circumferential action limiting relative to the bone nail. According to the reliable connecting structure of the tracer and the bone nail, the orientation of the tracer can be rapidly adjusted at any time according to actual requirements by adopting a circumferential gear meshing mode in cooperation with tightness adjustment, the support is effectively and stably fixed to the bone nail in the mode that the fastening sleeve is connected with the support and the bone nail in a sleeving mode, the stability of the tracer is guaranteed, and the tracer is prevented from being damaged. The support and the bone nail are provided with a circumferential limiting structure, and under the condition that the tracer is repeatedly disassembled and assembled, it can be effectively guaranteed that the relative position of the tracer and the bone nail can be kept unchanged every time the tracer is installed.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments and relates to a bone screw positioning reference element. Background Art

[0002] In some orthopedic navigation surgeries, bone screws can be used as devices for fixation or positioning purposes. Specifically, they are used as reference positioning points and fixed bases for devices such as tracers used for positioning. Therefore, for positioning purposes, the bone screws need to determine the precise insertion position and insertion posture for fixation, and at the same time, they need to have a stable supporting structure to ensure the accuracy of the position of the tracer and the bone screws. Existing surgical scenarios lack a connection structure that can ensure a stable tracer and bone screw connection. What is even more lacking is a connection structure that can ensure a stable position relationship when the target position frequently changes and the tracer is repeatedly disassembled, which often occurs during surgery. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a bone screw positioning reference element.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A bone screw positioning reference element comprises a bracket and a tracer, wherein the two ends of the bracket are respectively connected to the bone screw and the tracer; the bracket and the bone screw are axially abutted against each other, one of the bracket and the bone screw is provided with a limiting rib, and the other is provided with a limiting groove for the limiting rib to be inserted and matched, and when the limiting rib is matched with the limiting groove, the bracket forms a circumferential action limit relative to the bone screw.

[0006] Furthermore, a fastening sleeve is coaxially sleeved on the bracket, and the fastening sleeve is threadedly connected to the outer periphery of the bone screw.

[0007] Furthermore, a first step surface is provided on the outer circumference of the bracket along the circumferential direction, and a second step surface is provided on the inner circumference of the fastening sleeve along the circumferential direction, and the first step surface and the second step surface abut against each other along the axial direction of the bracket.

[0008] Furthermore, the limiting ribs and the limiting grooves are both in a T-shaped structure.

[0009] Furthermore, it also includes a base, which is sleeved on the outer circumference of the bone screw.

[0010] Furthermore, the tracer is provided with a ring, and the ring is sleeved on the bracket.

[0011] Furthermore, the bracket is also provided with a fixing ring, which is located at one end of the ring in the axial direction, and the fixing ring is against the ring. The bracket is also threadedly connected with a nut, which is located at the other end of the ring in the axial direction, and the nut is against the ring.

[0012] Furthermore, the fixing ring and the sleeve ring are respectively provided with a first ring tooth and a second ring tooth along the circumferential direction, and the first ring tooth and the second ring tooth are meshed.

[0013] In summary, the utility model is beneficial in that:

[0014] The utility model provides a reliable connection structure between a tracer and a bone screw, which adopts a circumferential gear meshing mode and cooperates with tension adjustment to quickly adjust the direction of the tracer at any time according to actual needs. The bracket and the bone screw are connected by a tightening sleeve to effectively stably fix the bracket to the bone screw to ensure the stability of the tracer. The bracket and the bone screw are provided with a circumferential limiting structure. When the tracer is repeatedly disassembled and assembled, it can be effectively ensured that the relative position of the tracer with the bone screw remains unchanged each time it is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the positioning reference element of the utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the cross-section structure in.

[0017] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of A.

[0018] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of B.

[0019] Figure 5 Schematic diagram of the structure of the bone nail.

[0020] Figure 6 A schematic diagram of the structure of the bracket.

[0021] Markings in the figure: 1. bone screw; 11. nail hole; 12. limiting groove; 13. base; 2. bracket; 21. first step surface; 22. limiting rib; 23. fixing ring; 24. nut; 3. fastening sleeve; 31. second step surface; 4. tracer; 41. collar. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0024] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0025] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0026] The utility model provides a bone screw positioning reference element for locating the femur position in a human body model, with reference to Figure 5 The head end of the bone screw 1 forms a self-tapping thread, which is screwed into the femur in a rotating manner to fix it. The tail end of the bone screw 1 forms a nail cap, which has a nail hole 11 in the shape of a cross or hexagon, etc., for a specific tool to apply a rotational screwing force to the bone screw 1.

[0027] Reference Figure 1 and Figure 2 The positioning reference element includes a tracer 4, and the tracer 4 is connected and installed with the bone screw 1 through a bracket 2. By determining the target position on the femur, the bone screw 1 is fixed at the target position, and then the bracket 2 and the tracer 4 are installed. Then, in subsequent work, by locating the position of the tracer 4 and performing certain spatial position calculations, the target position coordinates on the femur can be obtained, thereby achieving the effect of femoral positioning.

[0028] The support 2 is a straight rod structure, the top end of the support 2 is connected to the tracer 4, and the bottom end of the support 2 is connected to the bone screw 1. Figure 4, wherein a ring 41 is provided at one end of the tracer 4, and the ring 41 is sleeved on the outer periphery of the bracket 2. The ring 41 can rotate along the bracket 2, so that the tracer 4 can rotate and adjust its orientation with the bracket 2 as the rotating axis. A fixing ring 23 is also circumferentially provided on the bracket 2, and a first ring tooth is circumferentially provided at the top of the fixing ring 23, and a second ring tooth is circumferentially provided at the bottom of the ring 41. When the bottom of the ring 41 and the top of the fixing ring 23 are against each other, the first ring tooth is meshed with the second ring tooth.

[0029] The top of the bracket 2 is also threadedly connected with a nut 24, and the nut 24 is pressed against the top of the ring 41. When the nut 24 is tightened, the nut 24 generates a large pushing force on the ring 41 toward the direction of the fixing ring 23, so that the first ring teeth and the second ring teeth are pressed against each other, and then at this time, restricted by the ring teeth, the ring 41 cannot rotate relative to the bracket 2, and the tracer 4 cannot adjust its orientation; when the nut 24 is loosened, the nut 24 moves away from the ring 41, and then the ring 41 has a certain movable space in the axial direction, so that the first ring teeth can be separated from the second ring teeth, and then at this time, the ring 41 can rotate relative to the bracket 2 to adjust the orientation of the tracer 4.

[0030] Reference Figure 3 The outer periphery of the bottom end of the bracket 2 is provided with a fastening sleeve 3, and the fastening sleeve 3 is loosely matched with the bracket 2 so that it can rotate or move axially relative to the bracket 2. The bottom end of the fastening sleeve 3 is open and has a thread on the inner wall. The outer periphery of the nail cap of the bone screw 1 is provided with a thread so that the nail cap of the bone screw 1 can be threadedly connected with the bottom end of the fastening sleeve 3 to install and fix the bracket 2 and the bone screw 1.

[0031] The outer circumference of the bracket 2 is provided with a first step surface 21 along the circumferential direction, and the inner circumference of the fastening sleeve 3 is provided with a second step surface 31 along the circumferential direction. The second step surface 31 is open toward the bottom end of the fastening sleeve 3, that is, toward the direction of the bone screw 1. When the fastening sleeve 3 and the bone screw 1 are gradually tightened, the second step surface 31 will abut against the first step surface 21 to push the bracket 2 toward the direction of the bone screw 1, so that the bottom of the bracket 2 is tightly abutted against the top of the bone screw 1 to complete the fixing effect of the bracket 2.

[0032] Furthermore, in the process of locating the femur, the bone screw 1 is fixed at the target position of the femur, the bracket 2 is installed on the bone screw 1, and after the orientation of the tracer 4 is adjusted accordingly, the position orientation of the tracer 4 should no longer change to ensure the stability of the positioning effect. However, in actual operation, there will be certain situations that require the operator to remove the bracket 2 midway and then install it back. These situations include but are not limited to the movement of the femur, the setting of certain equipment and instruments, etc. In order to ensure that the relative position orientation of the tracer 4 and the bone screw 1 remains unchanged after the bracket 2 is removed and reinstalled, a limiting structure is also provided between the bracket 2 and the bone screw 1 in this embodiment.

[0033] Reference Figure 5 and Figure 6 The limiting structure includes a limiting rib 22 and a limiting groove 12 respectively arranged on the top of the bone screw 1 and the bottom of the bracket 2. In this embodiment, the limiting rib 22 is arranged on the bottom surface of the bracket 2, and the limiting groove 12 is arranged on the top surface of the nail cap of the bone screw 1. The limiting rib 22 and the limiting groove 12 are both T-shaped structures and can be matched to achieve circumferential limitation. When the bracket 2 is installed with the bone screw 1, the bottom surface of the bracket 2 is abutted against the top surface of the nail cap, so that the limiting rib 22 enters the limiting groove 12 for matching. Through such an arrangement, the angular position of the bracket 2 and the bone screw 1 in the circumferential direction during installation is fixed, thereby effectively ensuring that the position and orientation of the tracer 4 remain unchanged after re-disassembly.

[0034] A base 13 is also sleeved on the periphery of the bone screw 1 for circumferentially cooperating with the bone screw 1. Before fixing the bone screw 1, the base 13 is first set on the periphery of the bone screw 1, and then the bone screw 1 is fixed to the femur, so that the base 13 is further supported on the surface of the femur, thereby increasing the circumferential support area when the bone screw 1 is fixed to the femur, and avoiding the bone screw 1 from being skewed due to excessive tilting force applied to the bone screw 1 by the bracket 2 and the tracer 4 after installation.

[0035] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. A bone screw positioning reference element, characterized in that: The invention comprises a support (2) and a tracer (4), wherein the two ends of the support (2) are respectively connected to a bone screw (1) and the tracer (4); the support (2) and the bone screw (1) are axially opposed to each other, one of the support (2) and the bone screw (1) is provided with a limiting rib (22), and the other is provided with a limiting groove (12) for the limiting rib (22) to be inserted and matched, and when the limiting rib (22) is matched with the limiting groove (12), the support (2) forms a circumferential action limit relative to the bone screw (1).

2. A bone screw positioning reference element according to claim 1, characterized in that: A fastening sleeve (3) is coaxially sleeved on the support (2), and the fastening sleeve (3) is threadedly connected to the outer periphery of the bone screw (1).

3. A bone screw positioning reference element according to claim 2, characterized in that: The outer periphery of the bracket (2) is provided with a first step surface (21) along the circumferential direction, and the inner periphery of the fastening sleeve (3) is provided with a second step surface (31) along the circumferential direction, and the first step surface (21) and the second step surface (31) abut against each other along the axial direction of the bracket (2).

4. A bone screw positioning reference element according to claim 1, characterized in that: The limiting ribs (22) and the limiting grooves (12) are both T-shaped structures.

5. The bone screw positioning reference element according to claim 1, characterized in that: It also comprises a base (13), wherein the base (13) is sleeved on the outer circumference of the bone screw (1).

6. A bone screw positioning reference element according to claim 1, characterized in that: The tracer (4) is provided with a collar (41), and the collar (41) is sleeved on the bracket (2).

7. A bone screw positioning reference element according to claim 6, characterized in that: The bracket (2) is also provided with a fixing ring (23), the fixing ring (23) is located at one end of the axial direction of the collar (41), and the fixing ring (23) abuts against the collar (41); the bracket (2) is also threadedly connected with a nut (24), the nut (24) is located at the other end of the axial direction of the collar (41), and the nut (24) abuts against the collar (41).

8. A bone screw positioning reference element according to claim 7, characterized in that: The fixing ring (23) and the sleeve ring (41) are respectively provided with first ring teeth and second ring teeth along the circumferential direction, and the first ring teeth are meshed with the second ring teeth.

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