Bone nail beating and pulling device

Abstract

The utility model discloses a bone nail beating and pulling device which comprises a core shaft and a shaft sleeve, a movable buckle is hinged to the front end of the core shaft, the shaft sleeve is arranged outside the core shaft in a sleeved mode in the axial direction of the core shaft, and the shaft sleeve abuts against the movable buckle. When the shaft sleeve moves in the axial direction of the mandrel, the movable buckle is opened or closed relative to the front end of the mandrel. According to the driving and pulling device structure composed of the mandrel, the movable buckle, the shaft sleeve and the handle, a user holds the handle by hand, the movable buckle can be closed and opened by pushing the shaft sleeve to move back and forth, and therefore clamping and releasing of a bone nail are achieved, and when the bone nail is clamped, the bone nail and the front end of the driving and pulling device form a whole; a user obtains a larger and stable grabbing area through the handle, it can be guaranteed that a bone nail can be accurately nailed into a target position by knocking the handle, and the operation performance is greatly improved compared with a manual handheld fixing nailing mode.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments and relates to a bone nail extractor. Background Art

[0002] Bone screws are a common tool in orthopedic surgery and are often used for joint fixation, positioning marking, etc. The size of bone screws varies according to their uses. There are some small-sized bone screws that are shorter and need to be hammered into the bone. Due to their small diameter and length, they are not convenient to hold and fix by hand during operation. Similarly, some commonly used surgical tools are not suitable for assisting their fixation. Therefore, mistakes, crooked insertion, and falling off often occur during the operation. The existing small-sized bone screws lack a reasonable and stable auxiliary fixation method. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a bone nail extractor.

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

[0005] A bone screw puller comprises a core shaft and a sleeve, wherein the front end of the core shaft is hingedly provided with an active buckle, the sleeve is sleeved outside the core shaft along the axial direction of the core shaft, the sleeve abuts against the active buckle, and the active buckle opens or closes relative to the front end of the core shaft when the sleeve moves along the axial direction of the core shaft, and when the active buckle and the front end of the core shaft are closed, a chamber for clamping the nail cap of the bone screw is formed.

[0006] Furthermore, the movable buckle is provided with a first half groove, the front end of the core shaft is provided with a second half groove, and the first half groove and the second half groove are arranged opposite to each other.

[0007] Furthermore, a stop rod is fixedly connected to the inner side of the shaft sleeve, and the front end and the rear end of the movable buckle are respectively provided with abutment surfaces and a shift rod for abutting against the stop rod on both sides of the axial direction of the core shaft.

[0008] Furthermore, a side groove is provided on the core shaft in the axial direction, the side groove is connected to the outer peripheral wall of the core shaft in the radial direction of the core shaft, the blocking rod extends into the side groove, and the shifting rod is located in the side groove.

[0009] Furthermore, a spring is arranged between the shaft sleeve and the core shaft, and two ends of the spring respectively abut against the shaft sleeve and the core shaft along the axial direction of the core shaft.

[0010] Furthermore, an annular protrusion is provided on the outer periphery of the sleeve.

[0011] Furthermore, a handle is provided at the rear end of the mandrel.

[0012] In summary, the utility model is beneficial in that:

[0013] The puller structure composed of a core shaft, an active buckle, a shaft sleeve and a handle provided in the utility model can be closed and opened by a user holding the handle and pushing the shaft sleeve to move forward and backward, thereby clamping and releasing the bone nail. When clamping the bone nail, the bone nail and the front end of the puller are integrated, and the user obtains a larger and more stable gripping area through the handle. Tapping the handle can ensure that the bone nail can be accurately driven into the target position. Compared with the manual hand-held fixed nailing method, the operating performance is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the puller of the utility model when the front end is closed.

[0015] Figure 2 for Figure 1 Schematic diagram of the cross-section structure in.

[0016] Figure 3 This is a schematic diagram of the structure when the front end of the puller is opened.

[0017] Figure 4 for Figure 3 Schematic diagram of the cross-section structure in.

[0018] Figure 5 for Figure 3 Schematic diagram of the structure of the middle puller and bone screw when they cooperate.

[0019] Markings in the figure: 1, core shaft; 11, side groove; 12, second half groove; 2, sleeve; 21, annular protrusion; 22, spring; 23, stop rod; 3, handle; 4, movable buckle; 41, first half groove; 42, lever; 5, bone screw. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The utility model discloses a bone screw extractor, which is used for assisting the operation of manually inserting a bone screw into a bone for fixation and extracting the bone screw from the bone.

[0025] Specifically, refer to Figure 1 The puller includes a handle 3, a core shaft 1, and a sleeve 2. The handle 3 is arranged on the outer periphery of the core shaft 1 and is located at the rear end of the core shaft 1. The sleeve 2 is arranged on the outer periphery of the core shaft 1 and can slide axially relative to the core shaft 1.

[0026] The front end of the core shaft 1 is provided with an active buckle 4, which is hinged to the core shaft 1 so that the active buckle 4 can rotate within a certain range around the hinge axis and move closer to or away from the front end of the core shaft 1 during the rotation.

[0027] The front end of the movable buckle 4 is provided with a first half groove 41, and the front end of the core shaft 1 is provided with a second half groove 12. When the movable buckle 4 and the core shaft 1 are against each other, Figure 2 , the first half groove 41 and the second half groove 12 are in a relatively closed state to form a chamber with a complete annular groove structure, and the annular groove is set as an opening along the axial front end of the core shaft 1, and the diameter of the opening is smaller than the diameter of the annular groove. The nail cap of the bone screw 5 can be accommodated in the annular groove, and the front end of the bone screw 5 passes outward along the opening. In this state, the nail cap of the bone screw 5 is restricted in the annular groove, so that the bone screw 5 is clamped by the front end of the puller to form a support for the bone screw 5, so as to perform the operations of fixing the bone screw 5 into the bone and removing the bone screw 5 from the bone; when the movable buckle 4 moves away from the front end of the core shaft 1, the first half groove 41 and the second half groove 12 are relatively separated and opened, so that the bone screw 5 is separated from the front end of the core shaft 1, referring to Figure 3 , Figure 4 and Figure 5 .

[0028] The movement of the movable buckle 4 is realized by the axial movement of the sleeve 2. A side groove 11 is provided on the core shaft 1. The side groove 11 is provided along the axial direction of the core shaft 1 and is radially connected to the outer peripheral wall of the core shaft 1 to form a strip opening. A hinge shaft is provided between the inner walls of the opposite sides of the side groove 11, so that the rear end of the movable buckle 4 is hinged in the side groove 11. A stop rod 23 is provided on the inner side of the sleeve 2. The stop rod 23 extends into the side groove 11 and moves in the side groove 11 during the axial movement of the sleeve 2.

[0029] The front end of the movable buckle 4 is provided with an abutment surface. When the sleeve 2 moves toward the front end of the core shaft 1, the blocking rod 23 will abut against the abutment surface forward and push the movable buckle 4 to rotate until the movable buckle 4 abuts against the core shaft 1 to form a closed annular groove state. When maintained in this state, the front end of the puller is used to clamp the bone screw 5.

[0030] A lever 42 is provided at the rear end of the movable buckle 4. When the movable buckle 4 and the core shaft 1 are in a closed state, the lever 42 is inclined outward along the radial direction of the core shaft 1. Therefore, when the sleeve 2 moves toward the rear end of the core shaft 1, the blocking rod 23 will resist the lever 42 and generate a radial inward force on the lever 42 along the core shaft 1, thereby driving the rotation of the movable buckle 4, so that the front end of the movable buckle 4 and the core shaft 1 are relatively opened. In this state, the bone screw 5 is used to disengage from the front end of the puller.

[0031] When not affected by other external forces, the sleeve 2 maintains the position at the front end of the core shaft 1. Specifically, a spring 22 is arranged between the sleeve 2 and the core shaft 1, and the inner periphery of the sleeve 2 and the outer periphery of the core shaft 1 are provided with step surfaces. The two ends of the spring 22 respectively abut against the two step surfaces to form a bidirectional axial elastic force toward the sleeve 2 and the core shaft 1. The elastic force of the spring 22 pushes the sleeve 2 toward the front end of the core shaft 1, so that the blocking rod 23 abuts against the abutting surface of the movable buckle 4, and maintains the movable buckle 4 and the front end of the core shaft 1 in a state of abutting and closing.

[0032] An annular protrusion 21 is provided on the outer periphery of the sleeve 2 so that the user can more easily pull or push the sleeve 2 toward the rear end of the core shaft 1 to open the movable buckle 4.

[0033] In actual use and operation, when fixing the bone screw 5 to the bone, the active buckle 4 is first opened to insert the bone screw 5 and then closed, so that the front end of the puller fixes the bone screw 5. The user holds the handle 3 and aligns the head end of the bone screw 5 with the bone, and uses a hammer or other tool to knock the rear end of the handle 3 to drive the bone screw 5 into the bone for fixation, and then moves the sleeve 2 to open the active buckle 4, and then takes out the puller and leaves the bone screw 5 in the bone; when pulling out the bone screw 5 from the bone, the front end of the puller is brought close to the nail cap of the bone screw 5, the sleeve 2 is moved to open the active buckle 4, and after aligning with the nail cap, the sleeve 2 is released to close the active buckle 4 to clamp the bone screw 5. At this time, a pulling force is applied to the handle 3 to pull out the bone screw 5 from the bone.

[0034] 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 extractor, characterized in that: The invention comprises a core shaft (1) and a sleeve (2), wherein the front end of the core shaft (1) is hingedly provided with an active buckle (4), the sleeve (2) is sleeved outside the core shaft (1) along the axial direction of the core shaft (1), the sleeve (2) and the active buckle (4) abut against each other, and when the sleeve (2) moves along the axial direction of the core shaft (1), the active buckle (4) opens or closes relative to the front end of the core shaft (1), and when the active buckle (4) and the front end of the core shaft (1) are closed, a chamber for clamping the nail cap of a bone screw (5) is formed.

2. A bone screw extractor according to claim 1, characterized in that: The movable buckle (4) is provided with a first half groove (41), the front end of the core shaft (1) is provided with a second half groove (12), and the first half groove (41) and the second half groove (12) are arranged opposite to each other.

3. A bone screw extractor according to claim 1, characterized in that: A stop rod (23) is fixedly connected to the inner side of the shaft sleeve (2), and the front end and the rear end of the movable buckle (4) are respectively provided with abutment surfaces and a shifting rod (42) for abutting against the stop rod (23) on both sides of the axial direction of the core shaft (1).

4. A bone screw extractor according to claim 3, characterized in that: The core shaft (1) is provided with a side groove (11) along the axial direction, the side groove (11) is connected to the outer peripheral wall of the core shaft (1) along the radial direction of the core shaft (1), the blocking rod (23) extends into the side groove (11), and the shifting rod (42) is located in the side groove (11).

5. A bone screw extractor according to any one of claims 1 to 4, characterized in that: A spring (22) is arranged between the shaft sleeve (2) and the core shaft (1), and two ends of the spring (22) respectively abut against the shaft sleeve (2) and the core shaft (1) along the axial direction of the core shaft (1).

6. The bone screw extractor according to claim 1, characterized in that: An annular protrusion (21) is provided on the outer periphery of the shaft sleeve (2).

7. The bone screw extractor according to claim 1, characterized in that: A handle (3) is provided at the rear end of the core shaft (1).

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