Parallel press memory alloy nail foot fixer and matched use tool thereof

Abstract

The utility model relates to medical equipment technical field, especially a kind of parallel pressurization memory alloy nail foot fixer and its matched use tool. Including arc nail back, nail foot and anti-skid tooth, arc nail back both ends are provided with nail foot and present ring embrace, be equipped with multiple anti-skid tooth on nail foot;Fixed boss is equipped on the arc nail back, fixed boss protrudes arc nail back outer edge surface, fixed boss and pincer body jaw are pasted and are clamped, pincer body is opened and makes arc nail back unfold, arc nail back and nail foot are through bending part and present zigzag. Arc nail back and nail foot bending connection, make arc nail back bow back and nail foot be placed in two different planes, two nail feet always keep parallel in the process of being opened and being contracted, clamping force is uniform and stable, and anti-skid tooth is set in nail foot inside to improve clamping stability.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a parallel pressure memory alloy pin fixator and its matching tools. Background Technology

[0002] In current orthopedic surgeries, U-shaped nail fixation devices have been widely recognized and used by doctors. Existing U-shaped nail products on the market are generally made of two materials: stainless steel or shape memory alloy. Both stainless steel and shape memory alloy nails utilize the elasticity of the material to apply pressure to the affected bone. The difference lies in the shape memory alloy material, which, due to its unique shape memory properties, can actively apply pressure to the affected bone, increasing the fixation force and resulting in a better fixation effect compared to stainless steel nails. Currently, U-shaped nail products all adopt a curved back structure, with angled nail feet at both ends of the curved back. The angle between the curved back and the nail feet deforms the curved back to achieve the fixation purpose. Due to structural limitations, this type of nail can only use single cortical fixation, and the force is uneven at both ends, with weaker fixation force at the curved back. Utility Model Content

[0003] The purpose of this utility model is to solve the technical problems existing in the prior art. This utility model provides a parallel pressure memory alloy pin fixator with special structure, simple procedure, convenient operation, fast postoperative healing, and uniform and stable clamping force, as well as its matching tools.

[0004] A parallel pressure shape memory alloy nail foot retainer includes an arc-shaped nail back, nail feet, and anti-slip teeth. The arc-shaped nail back has nail feet at both ends in a wrap-around shape, and the nail feet have multiple anti-slip teeth. The arc-shaped nail back has a fixing boss that protrudes from the outer edge surface of the arc-shaped nail back. The fixing boss is fitted and locked to the jaws of the clamp body. When the clamp body is opened, the arc-shaped nail back unfolds, and the arc-shaped nail back and nail feet are bent through a bending section.

[0005] The included angle between the curved nail back and the bent part of the nail foot is A, and the included angle A is 30°-150°.

[0006] The ends of the nail feet or fixing bosses are round, pointed, or square.

[0007] The arc-shaped nail back is arc-shaped with a radius of 4-10mm.

[0008] The number of anti-slip teeth is 1-20, and the tooth length of the anti-slip teeth is 0.4-1.6mm.

[0009] A tool for use with a parallel pressure memory alloy nail foot fixator includes a clamp body, clamp jaws, and a housing. One end of the clamp body has a clamp jaw with a fixing groove that engages with a fixing boss of the memory alloy nail foot fixator. The other end of the clamp body is fixedly connected to the housing. There are two sets of clamp bodies, located on both sides of the housing. The housing has threaded through holes that penetrate the housing and are threadedly connected to a threaded rod. One end of the threaded rod is fixedly connected to a knob, and the other end is hinged to a connecting rod. The other end of the connecting rod is connected to a wedge-shaped plate, which engages with the clamp jaws of the two sets of clamp bodies. The position of the wedge-shaped plate is adjusted by screwing the threaded rod into the threaded through hole. The wedge-shaped plate adjusts the opening size of the clamp jaws by adjusting the position of the wedge-shaped plate. The clamp jaws open synchronously through the fixing boss and the fixing groove.

[0010] The two sets of clamps are symmetrically arranged on both sides of the outer shell.

[0011] The clamp body has two arched sections and is bow-shaped. One end of the bow-shaped clamp body is fixedly connected to the outer shell 7, and the other end of the bow-shaped clamp body is provided with jaws.

[0012] The wedge-shaped plate is threaded with a screw, and the end of the screw fits into and locks the connecting rod.

[0013] This utility model has the following advantages over existing technologies: The parallel pressure memory alloy pin fixator mainly consists of an arc-shaped pin back and pins made of memory alloy. The planes of the arc-shaped pin back and pins form an integrated annular structure with a certain angle. The inner side of the arc-shaped pin back has multiple fixing bosses for use with matching tools, and the inner side of the two pins has multiple anti-slip teeth. This structural design allows the two pins to expand in parallel opposite directions after the arc-shaped pin is opened. In the working state, the two pins of the parallel pressure memory alloy pin fixator retract inward in parallel to achieve a bicortical fixation effect and ensure uniform force on the cortical layers at both ends. Furthermore, the different angles of the planes of the arc-shaped pin back and pins provide doctors with different bone-contact solutions for various usage scenarios. The bosses designed for use with matching tools are designed to fit the tool at the factory. After the parallel pressure memory alloy pin fixator has been fully cooled during surgery, the tool provides doctors with a more stable and convenient clamping method. Furthermore, the fixation teeth on the inner side of the parallel pressure shape memory alloy pin fixator ensure its stability during operation. Throughout the procedure, not only is bicortical fixation achieved at the bone site, but the implantation and removal are also convenient, resulting in a short operation time, minimal trauma, and rapid postoperative healing. This is beneficial for the patient's postoperative recovery.

[0014] In summary, this utility model has the following advantages: This design modifies the traditional structure, with the curved back of the screw and the bent feet connecting them. This places the curved back and feet on two different planes, ensuring the feet remain parallel during expansion and contraction, resulting in uniform and stable clamping force. Anti-slip teeth on the inner side of the feet further enhance clamping stability. The angle between the planes of the curved back and the feet can be adjusted according to different surgical procedures to achieve optimal wound fit, providing surgeons and patients with more surgical options. To address different fixation positions and varying degrees of slippage, the flat feet offer different tooth shapes and numbers of anti-slip teeth to optimize fixation for various traumatic conditions. The parallel feet teeth offer different tooth lengths to accommodate variations in cortical bone thickness, providing optimal fixation for different bone types. Different foot lengths are available, and the offset ensures effective fixation even in areas with significant differences in bone thickness, such as the epiphysis and diaphysis. A boss structure on the inner side of the parallel foot end face allows for use with disposable tools. This effectively ensures that the curved nail back is properly opened, facilitating the effective insertion of a memory alloy nail foot fixator into the patient's body. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the parallel pressure memory alloy nail foot fixation device of this utility model; Figure 2 A schematic diagram of the tool structure for use with the parallel pressure memory alloy nail foot fixator of this utility model; Figure 3 A partially enlarged schematic diagram of the interface between the tool used with the parallel pressure memory alloy nail foot fixer of this utility model and the parallel pressure memory alloy nail foot fixer; Figure 4 A schematic diagram of the mating structure of the tool knob, threaded rod and connecting rod used with the parallel pressure memory alloy nail foot fixer of this utility model; Figure 5 This is a schematic diagram of the threaded rod hinged connection rod structure of this utility model; Figure 6 This is a schematic diagram of the assembly of the arc-shaped nail back and the clamp jaws of this utility model; The meanings of the reference numerals in the accompanying drawings of this utility model are as follows: 1. Arc-shaped nail back; 2. Nail foot; 3. Anti-slip teeth; 4. Fixing boss; 5. Knob; 6. Threaded rod; 7. Outer shell; 8. Connecting rod; 9. Screw; 10. Wedge-shaped piece; 11. Fixing groove. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] A parallel pressure shape memory alloy nail foot retainer includes an arc-shaped nail back 1, nail feet 2, and anti-slip teeth 3. The arc-shaped nail back 1 has nail feet 2 at both ends in a ring shape, and the nail feet 2 are provided with multiple anti-slip teeth 3. The arc-shaped nail back 1 is provided with a fixing boss 4, which protrudes from the outer edge surface of the arc-shaped nail back 1. The fixing boss 4 is fitted and locked with the jaws of the clamp body. When the clamp body is opened, the arc-shaped nail back 1 is unfolded, and the arc-shaped nail back 1 and nail feet 2 are bent in a zigzag shape through the bending part.

[0018] The bending angle between the curved nail back 1 and the bent part of the nail foot 2 is A, which is 30°-150°. The end of the nail foot 2 or the fixing boss 4 is round, pointed, or square. The curved nail back 1 is arc-shaped with a radius of 4-10mm. The number of anti-slip teeth 3 is 1-20, and the tooth length of the anti-slip teeth 3 is 0.4-1.6mm.

[0019] A tool for use with a parallel pressure memory alloy nail foot fixator includes a clamp body, clamp jaws, and a housing 7. One end of the clamp body has a clamp jaw with a fixing groove 11 that engages with a fixing boss 4 of the aforementioned memory alloy nail foot fixator. The other end of the clamp body is fixedly connected to the housing 7. There are two sets of clamp bodies, located on both sides of the housing 7. The housing 7 has a threaded through hole that penetrates the housing 7 and is threadedly connected to a threaded rod 6. One end of the threaded rod 6 is fixedly connected to a knob 5, and the other end of the threaded rod 6 is hinged to a connecting rod 8. The other end of the connecting rod 8 is connected to a wedge 10, which fits against the clamp jaws of the two sets of clamp bodies. The threaded rod 6 adjusts the position of the wedge 10 by screwing it into the threaded through hole. The wedge 10 adjusts the opening size of the clamp jaws by adjusting the position of the wedge jaws. The clamp jaws, through the fixing boss 4 and the fixing groove 11, simultaneously open the arc-shaped nail back 1.

[0020] The two sets of clamps are symmetrically arranged on both sides of the outer shell 7. Each clamp has two arched sections, forming an arc shape. One end of the arc-shaped clamp is fixedly connected to the outer shell 7, and the other end has a jaw. A screw 9 is threaded onto the wedge-shaped plate 10, with the end of the screw 9 engaging with and locking the connecting rod 8. During the surgery, the matching tools are used to fully unfold the pin legs, a hole is drilled at the affected bone site, and a parallel pressure-memory alloy pin leg fixator is inserted. After installation, a heat-applied fixator is applied, and the two pin legs are repositioned, allowing the affected bone site to recover. Throughout the entire procedure, not only is bicortical fixation achieved at the affected bone site, but the implantation and removal operations are also convenient, the surgery time is short, the trauma area is small, and postoperative healing is rapid. This is beneficial to the patient's postoperative recovery.

[0021] like Figure 1As shown, the ends of the screw feet 2 are designed in round, pointed, or square shapes to ensure safer and more effective clamping of the screw feet when hole conditions permit. Furthermore, the round, pointed, or square shapes provide different clamping strengths to meet the needs of various scenarios. The pointed shape allows for easier and faster clamping and removal of the screw feet when surgical conditions are not ideal. The bending angle A ranges from 30° to 150°, aiming to allow the curved screw back to better conform to the bone surface under different conditions. The anti-slip teeth 3, with a tooth length of 0.4-1.6mm, are designed to provide sufficient clamping capacity to meet the requirements of different surgical environments.

[0022] like Figure 2-5 As shown, the parallel pressure memory alloy nail holder is placed in ice water at 0-4℃. The parallel pressure memory alloy nail holder returns to its initial state. In the initial state, the tool is used to fix the groove 11 and the fixing boss 4 of the memory alloy nail holder. By rotating the knob 5 on the top of the tool clockwise, the wedge 10 moves downward to open the arc-shaped nail back 1, thus opening the parallel pressure memory alloy nail holder to facilitate insertion into the drilled hole at the nail insertion site. Rotating the top knob 5 of the accessory tool counterclockwise reveals a cylindrical pin at the bottom of the threaded rod 6, which is positioned within the groove of the connecting rod 8. As the threaded rod 6 rotates counterclockwise, it pulls upwards the connecting rod 8 and the wedge-shaped piece 10, which is fixed to the connecting rod 8 with screws 9. After the wedge-shaped piece 10 has fully risen, press inwards the front support of the accessory tool's outer casing 7. The fixing groove 11 disengages from the fixing boss 4, releasing the parallel pressure memory alloy nail foot fixator into the pre-drilled hole at the desired nail foot location. After installation, body temperature or a hot compress causes the two nail feet of the fixator to retract and encircle. This retraction and encirclement provides a stronger tightening and locking effect compared to the initial state, facilitating bicortical fixation at the fracture site throughout the surgery. Furthermore, the implantation and removal procedures are convenient, the surgery time is short, the wound is small, and postoperative healing is rapid. This is beneficial for the patient's postoperative recovery.

[0023] When the wedge block 10 moves to its lower limit, the lower end of the tool opens to form an opening, allowing the parallel pressure memory alloy nail holder, in its open state, to be positioned in the pre-selected position. The accompanying tool assists in opening the nail, and the clamp body effectively controls the placement position and adjusts the angle. When the wedge block 10 moves to its upper limit, the lower end of the tool tightens and disengages from the parallel pressure memory alloy nail holder. Body temperature or a heat therapy device then enables the parallel pressure memory alloy nail holder to self-pressurize. The tool's fixing groove 11 engages with the fixing boss 4 of the memory alloy nail holder to prevent accidental disengagement, breakage, or ejection under pressure. The memory alloy nail holder can only be disengaged and removed at the upper limit position of the wedge block.

Claims

1. A parallel pressure memory alloy nail foot fixator, comprising an arc-shaped nail back (1), nail feet (2), and anti-slip teeth (3), wherein the arc-shaped nail back (1) is provided with nail feet (2) at both ends in a ring shape, and the nail feet (2) are provided with multiple anti-slip teeth (3); characterized in that The arc-shaped nail back (1) is provided with a fixed boss (4). The fixed boss (4) protrudes from the outer edge surface of the arc-shaped nail back (1). The fixed boss (4) is fitted and locked with the jaws of the clamp body. When the clamp body is opened, the arc-shaped nail back (1) unfolds. The arc-shaped nail back (1) and the nail foot (2) are bent through the bending part.

2. The parallel pressure memory alloy pin holder according to claim 1, characterized in that... The bending angle between the curved nail back (1) and the bent part of the nail foot (2) is A, and the bending angle A is 30°-150°.

3. The shape memory alloy pin holder according to claim 1, characterized in that... The ends of the nail feet (2) or fixing bosses (4) are round, pointed, or square.

4. The parallel pressure memory alloy pin holder according to claim 1, characterized in that... The arc-shaped nail back (1) is arc-shaped with a radius of 4-10mm.

5. The parallel pressure memory alloy pin holder according to claim 1, characterized in that... The number of anti-slip teeth (3) is 1-20, and the tooth length of the anti-slip teeth 3 is 0.4-1.6mm.

6. A tool for use with a parallel pressure shape memory alloy nail foot fixator, characterized in that... The device includes a clamp body, clamp jaws, and an outer shell (7). One end of the clamp body is provided with clamp jaws, and a fixing groove (11) is provided on the clamp jaws. The fixing groove (11) is engaged with the fixing boss (4) of the parallel pressure memory alloy nail foot fixer according to any one of claims 1 to 5. The other end of the clamp body is fixedly connected to the outer shell (7). The clamp body is provided in two sets, and the two sets of clamp bodies are provided on both sides of the outer shell (7). The outer shell (7) is provided with a threaded through hole, which penetrates the outer shell (7). The threaded through hole is connected to the threaded rod (6). The threaded rod (1) is fixedly connected to a knob (5) at one end, and the threaded rod (6) is hinged to a connecting rod (8) at the other end. The connecting rod (8) is connected to a wedge (10) at the other end. The wedge (10) fits into the jaws of the two sets of clamps. The threaded rod (6) adjusts the position of the wedge (10) by screwing into the threaded through hole. The wedge (10) adjusts the jaw opening size by adjusting the position of the jaw. The jaw opens synchronously by the fixed boss (4) and the fixed groove (11).

7. The tool for use with the parallel pressure memory alloy nail foot fixator according to claim 6, characterized in that... The two sets of clamps are symmetrically arranged on both sides of the outer shell (7).

8. The tool for use with the parallel pressure memory alloy nail foot fixator according to claim 7, characterized in that... The clamp body has two arched sections and is in the shape of an arc. One end of the arc-shaped clamp body is fixedly connected to the outer shell (7), and the other end of the arc-shaped clamp body is provided with jaws.

9. The tool for use with the parallel pressure memory alloy nail foot fixator according to claim 6, characterized in that... The wedge-shaped plate (10) is threaded with a screw (9), and the end of the screw (9) is fitted to lock the connecting rod (8).

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