Separated pressurized external fixation threaded spicule and external fixation support system

Abstract

The utility model discloses a separating type pressurizing external fixation threaded spicule and an external fixation support system, and belongs to the technical field of medical auxiliary instruments, the separating type pressurizing external fixation threaded spicule comprises a pressurizing screw used for being retained in a body, the front part of the pressurizing screw is provided with an external thread, and the middle rear part of the pressurizing screw is provided with a polished rod; and the tail part is provided with a depth limiting ring and is detachably connected with an outer bracket connecting rod. According to the utility model, the fracture end can be effectively pressurized, a nail path is avoided, and the use effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary equipment, in particular to a separate pressurized external fixation threaded bone pin and an external fixation bracket system. Background Art

[0002] Intertrochanteric fracture is a common hip fracture in clinical practice. Epidemiological statistics show that intertrochanteric fracture accounts for 35.7% of hip fractures and 3.51% of total body fractures. This disease is most common in the elderly, more common in women than in men. It is one of the most threatening traumatic diseases to the health of the elderly and is also known as the "last fracture in life."

[0003] External fixation is a method of fracture fixation, which has the advantages of short operation time and less bleeding. However, external fixation of intertrochanteric fractures is rarely used clinically, and is only suitable for patients with intertrochanteric fractures who have serious medical diseases and cannot undergo internal fixation. The main reasons affecting the use of external fixators are:

[0004] 1. Due to the defects of the round bone needles or threaded bone needles currently used in external stents, they cannot exert pressure on the fracture ends, which can easily lead to the loss of fracture reduction and affect fracture healing.

[0005] 2. In the treatment of intertrochanteric fractures, external fixation usually requires the use of multiple round bone pins or threaded bone pins fixed to the femoral head to achieve the fixation effect. After the secondary removal of the external fixator, the femoral head and neck will leave a cavity caused by the nail channel, which can easily lead to femoral neck fractures and cause iatrogenic injuries.

[0006] 3. According to biological research, a satisfactory tip to apex distance (TAD) and a screw located in the center of the femoral head have a better anti-rotation effect. However, the currently used round bone pins or threaded bone pins are solid structures. During use, they can only be based on the surgeon's experience and repeated C-arm fluoroscopy, and it is difficult to accurately implant them in the ideal position.

[0007] 4. The intertrochanteric external fixator needs to be fixed for a long time, which will cause the risk of nail infection and loosening. At the same time, it is inconvenient to care for and dress the patient, and some patients even need to switch to internal fixation treatment, which increases the patient's pain and economic burden.

[0008] Therefore, there are still many areas that need improvement in the external fixation treatment of intertrochanteric fractures in the prior art. Utility Model Content

[0009] The technical problem to be solved by the utility model is to provide a separate pressurized external fixation threaded bone pin and an external fixation bracket system which can effectively pressurize the fracture end and avoid the formation of nail channels and have good use effect.

[0010] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0011] On the one hand, a detachable pressurized external fixation threaded bone pin is provided, comprising a pressurized screw for retention in the body, wherein the front portion of the pressurized screw is provided with an external thread, the middle and rear portions are a bare rod, the tail portion is provided with a depth limiting ring and is detachably connected to an external support connecting rod.

[0012] Furthermore, an axial through hole for accommodating a Kirschner wire is provided in the middle of the pressure screw.

[0013] Furthermore, the rear portion of the axial through hole is provided with an internal thread, and the front portion of the external support connecting rod is provided with an external thread matching the internal thread.

[0014] Furthermore, the external thread of the pressure screw is a double-thread thread.

[0015] Furthermore, a D-type interface is provided at the rear of the outer bracket connecting rod.

[0016] Furthermore, the depth limiting ring is also used as an instrument driving part.

[0017] Furthermore, the depth limiting ring is a quadrilateral, a hexagon or an octagon.

[0018] On the other hand, an external fixation bracket system is provided, including an antagonistic sleeve and the above-mentioned separate pressurized external fixation threaded bone pin, the antagonistic sleeve including a sleeve body, the front part of the sleeve body is provided with a matching groove for accommodating the depth limiting ring, and the middle part is provided with an axial through hole for accommodating the external bracket connecting rod.

[0019] Furthermore, a handle is provided at the rear of the sleeve body.

[0020] Furthermore, the counter sleeve is T-shaped.

[0021] The utility model has the following beneficial effects:

[0022] 1. The design of the compression screw in front of the bone pin and the depth-limiting ring at the tail of the screw can effectively pressurize the fracture end. The design of the depth-limiting ring ensures better axial stability, solves the problem that the existing bone pin cannot be pressurized after implantation and there is a nail channel during the second-stage removal, which is conducive to the growth of new bone during the healing process and accelerates fracture healing, reducing the risk of non-union.

[0023] 2. With the split structure, only the rear external support connecting rod can be removed after the initial healing of the fracture, and the front compression screw part is left at the fracture end, so that no nail channel will appear, which can avoid iatrogenic femoral neck fracture caused by nail channel, and effectively avoid the loss of secondary fracture reduction.

[0024] 3. Because the front compression screw is left at the fracture end, the mechanical stability is higher. Compared with the previous external fixation technology, the external support device can be removed earlier, reducing the risk of nail tract infection and making the patient's daily life more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the pressure screw in the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the outer bracket connecting rod of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the counter sleeve in the utility model;

[0028] Figure 4 This is a schematic diagram of the combined structure of the pressure screw, the outer bracket connecting rod and the counter sleeve in the utility model;

[0029] Figure 5 It is a schematic diagram of the use state of the separate pressurized external fixation threaded bone pin of the utility model. DETAILED DESCRIPTION

[0030] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] On the one hand, the utility model provides a separate pressurized external fixation threaded bone pin, such as Figure 1-5 As shown, it includes a pressure screw 1 for retention in the body, the front part of the pressure screw 1 is provided with an external thread 11, the middle and rear part is a bare rod 12, the tail part is provided with a depth limiting ring 13 and is detachably connected with an external bracket connecting rod 2.

[0033] During external fixation surgery, Figure 5 As shown, the compression screw 1 and the external support connecting rod 2 are combined together to form the entire bone needle, which is then implanted into the fracture site (such as the femur 5 fracture site) with reference to the prior art.

[0034] Compared with the conventional external fixation threaded bone pins, the separated pressurized external fixation threaded bone pins of the utility model have the following advantages:

[0035] 1. The design of the compression screw in front of the bone pin and the depth-limiting ring at the tail of the screw can effectively pressurize the fracture end. The design of the depth-limiting ring ensures better axial stability, solves the problem that the existing bone pin cannot be pressurized after implantation and there is a nail channel during the second-stage removal, which is conducive to the growth of new bone during the healing process and accelerates fracture healing, reducing the risk of non-union.

[0036] 2. With the split structure, only the rear external support connecting rod can be removed after the initial healing of the fracture, and the front compression screw part is left at the fracture end, so that no nail channel will appear, which can avoid iatrogenic femoral neck fracture caused by nail channel, and effectively avoid the loss of secondary fracture reduction.

[0037] 3. Because the front compression screw is left at the fracture end, the mechanical stability is higher. Compared with the previous external fixation technology, the external support device can be removed earlier, reducing the risk of nail tract infection and making the patient's daily life more convenient.

[0038] Therefore, the separate pressurized external fixation threaded bone pin of the utility model can effectively pressurize the fracture end, avoid the formation of nail channels, and has a good use effect. The utility model is suitable for external fixation bracket surgery, such as external fixation of intertrochanteric fracture of the femur.

[0039] To facilitate the implantation of the pressure screw 1, preferably, the middle part of the pressure screw 1 is provided with an axial through hole 14 for accommodating a Kirschner wire, that is, the pressure screw 1 is a hollow structure / hollow screw, so that when in use, the Kirschner wire can be used as a guide pin first, and after the C-arm perspective position is satisfactory, the pressure screw 1 in the front is screwed in along the guide pin, and then the external support connecting rod 2 at the back is connected. Compared with the previous external fixation threaded bone pins, the operation time can be significantly reduced and the accuracy of the screw placement can be improved. Because the device is a minimally invasive fixation, it reduces blood supply damage, is simple and safe to operate, can meet the requirements of accurate reduction and stable fixation of intertrochanteric fractures of the femur, and avoids the shortcomings of existing external fixation bracket fixation. At the same time, the utility model can be applied to different fracture sites and can meet the requirements of small incision minimally invasive surgery.

[0040] The external thread 11 of the compression screw 1 can be a double-thread thread to increase the screw insertion speed and the compression fixation effect. The axial length of the external thread 11 can be determined based on measurement matching and clinical practice to find a more suitable thread length, thereby reducing the risk of secondary injury to the patient caused by an overly long or short thread.

[0041] The detachable connection between the pressure screw 1 and the external bracket connecting rod 2 can be achieved by various methods that can be easily thought of by technicians in this field, such as clamping, etc. However, for the convenience of implementation and use, preferably, the rear part of the axial through hole 14 of the pressure screw 1 is provided with an internal thread 141, and the front part of the external bracket connecting rod 2 is provided with an external thread 21 that matches the internal thread 141. In this way, through the threaded connection, connection and disassembly are relatively convenient, easy to use, and have better firmness.

[0042] A D-type interface 22 may be provided at the rear of the external support connecting rod 2, which can be used in conjunction with a power or T-type wrench to facilitate the secondary removal of the external support connecting rod 2, thereby shortening the operation time.

[0043] In order to facilitate driving the pressure screw 1, the depth limiting ring 13 of the pressure screw 1 is preferably used as an instrument driving part at the same time, and it can be in various shapes, such as a quadrilateral, a hexagon or an octagon.

[0044] On the other hand, the utility model provides an external fixation support system, including a counter sleeve 3 and the above-mentioned separate pressurized external fixation threaded bone needle. Since the structure of the separate pressurized external fixation threaded bone needle is the same as above, it will not be repeated here.

[0045] The counter sleeve 3 includes a sleeve body 31, a front portion of which is provided with a matching groove 32 (the shape of which is consistent with the depth limiting ring 13, for example, a hexagonal matching groove) for accommodating the depth limiting ring 13, and a middle portion thereof is provided with an axial through hole 33 for accommodating the outer bracket connecting rod 2. The counter sleeve 3 can firmly hold the pressure screw 1, and facilitates the connection and removal of the outer bracket connecting rod 2 and the pressure screw 1.

[0046] The external fixation support system of the utility model is composed of a pressure screw 1, an external support connecting rod 2 and a counter sleeve 3. It mainly inserts a bone needle into the broken bone to play the role of reducing the fracture M by applying pressure during the external fixation support surgery. In the second stage, only the rear external support connecting rod 2 is removed, and the front pressure screw 1 is left at the fracture end to achieve the "external fixation + internal fixation" effect, which is more minimally invasive than simple internal fixation and more secure than simple external fixation. The utility model can effectively pressurize the fracture end to avoid the appearance of nail channels, and has a good use effect.

[0047] A handle 34 may be provided at the rear of the sleeve body 31 , and the antagonistic sleeve 3 may be T-shaped as shown in the figure, so as to facilitate holding and operating the antagonistic sleeve 3 .

[0048] In summary, the separate pressurized external fixation threaded bone pin and external fixation bracket system of the utility model has the following advantages:

[0049] 1. The utility model product can be applied to different fracture sites and is suitable for minimally invasive surgery with small incisions, which can reduce the probability of wound infection caused by open surgery.

[0050] 2. The front end of the utility model product is a hollow structure. When in use, you can use a guide pin first to achieve precise nail placement and then connect the external bracket connecting rod; the end adopts a D-type interface, which can be used with a power or T-type wrench to facilitate the second-stage removal of the external bracket connecting rod.

[0051] 3. The optimal length of the front thread of the utility model product can be obtained after measurement and simulation, and the middle and rear ends of the hollow screw are also guaranteed to be smooth, which reduces the probability of secondary injury to the patient caused by subsequent pressure when the bone needle is implanted into the broken bone, thereby reducing the risk of infection.

[0052] 4. The depth limiting ring installed in the middle section of the utility model product according to the biological force of the bone needle and bone interface can make the middle section more stable when pressurized, thus accelerating the healing of fractures.

[0053] 5. The hollow screw and the external support connecting rod in the utility model product are detachable through the counter sleeve, and the hollow screw can be taken out later or left in the patient's body, which greatly enhances the bone stability of the patient during postoperative exercise.

[0054] The operation steps of the present invention can be referred to as follows:

[0055] 1) Before external fixation of fractures, local anesthesia or general anesthesia should be selected according to the patient's specific condition and surgical needs;

[0056] 2) An incision needs to be made at the fracture site. The length and location of the incision should be determined according to the specific circumstances of the fracture. Be careful not to damage the surrounding blood vessels and nerves during the incision.

[0057] 3) After the incision, the fractured bone needs to be repositioned. The method of repositioning should be determined according to the type and severity of the fracture. After repositioning, check whether the bone position is correct;

[0058] 4) After reduction, the fracture end can be fixed with this product for pressure application; the tail end of this product can be connected to a conventional external fixation device to effectively maintain the mechanical stability of the fracture end;

[0059] 5) After fixation, imaging such as X-rays can be used to examine the fracture site to ensure that the bone is in the correct position and fixed securely;

[0060] 6) After checking and fixing, suture the incision. Pay attention to the details and firmness of the wound to promote wound healing;

[0061] 7) After suturing, the wound should be dressed to keep it dry and clean to avoid infection;

[0062] 8) After the operation, the patient's vital signs are tested, appropriate pain medications are given, and postoperative guidance and other postoperative treatments are provided.

[0063] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An external fixation support system, characterized in that: The invention comprises a counter sleeve and a separate compression external fixation threaded bone pin, wherein: The separate pressurized external fixation threaded bone pin comprises a pressurized screw for being retained in the body, the front part of the pressurized screw is provided with an external thread, the middle and rear parts are a bare rod, the tail part is provided with a depth limiting ring and is detachably connected to an external bracket connecting rod, and the depth limiting ring is also used as an instrument driving part; The counter sleeve comprises a sleeve body, a front portion of which is provided with a matching groove for accommodating the depth limiting ring, and a middle portion of which is provided with an axial through hole for accommodating the outer bracket connecting rod.

2. The external fixation support system according to claim 1, characterized in that: An axial through hole for accommodating a Kirschner wire is provided in the middle of the pressure screw.

3. The external fixation system according to claim 2, characterized in that: An internal thread is arranged at the rear of the axial through hole, and an external thread matching with the internal thread is arranged at the front of the external support connecting rod.

4. The external fixation system according to claim 1, characterized in that: The external thread of the pressure screw is a double-thread thread.

5. The external fixation support system according to claim 1, characterized in that: A D-type interface is provided at the rear of the outer bracket connecting rod.

6. The external fixation support system according to claim 1, characterized in that: The depth limiting ring is a quadrilateral, a hexagon or an octagon.

7. The external fixation system according to claim 1, characterized in that: A handle is provided at the rear of the sleeve body.

8. The external fixation system according to claim 7, characterized in that: The counter sleeve is T-shaped.

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