Band wire cannulated screw internal fixation system

Abstract

The utility model relates to medical instrument technical field, and specifically is a kind of with line hollow screw internal fixation system, including guide needle, hollow screw, and hollow screw includes screw rod body, and the head is provided in screw rod body one end, and the outer thread is provided in the periphery of screw rod body, and the slot is provided in the other end of screw rod body;Hollow screw is provided with the hollow passage that penetrates along its axial direction inside, and suture is provided with needle tip in one end by the hollow passage that penetrates hollow screw, the one end of suture is connected with needle tip. Through the cooperation of hollow screw and line needle tip, the problem that traditional hollow screw is easy to loosen in patella fracture fixation, and the fixed strength is insufficient is solved, realizes joint ligament repair and performs purse-string suture, significantly improves the stability of fracture internal fixation and the convenience of operation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a hollow screw internal fixation system with a suture. Background Technology

[0002] Currently, hollow screws used for internal fixation of fractures in clinical practice generally employ a single structure. However, in fractures at certain special locations, such as patellar fractures, a series of problems exist: existing hollow screws are prone to loosening in areas with abundant cancellous bone, such as the patella, leading to loss of fracture reduction; traditional hollow screws rely solely on the holding force provided by the threads, which is insufficient for patients with osteoporosis or comminuted fractures, and tears in surrounding ligaments require separate suture repair, which may result in insecure fixation of ligaments and fractures if the sutures are not connected to the screws; traditional Kirschner wire and titanium cable systems have a high incidence of surgical failures due to Kirschner wire withdrawal and fixation failure. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hollow screw internal fixing system with wire.

[0004] The technical solution adopted by this utility model to solve its technical problem is: A suture-guided hollow screw internal fixation system includes a guide pin and a hollow screw. The hollow screw includes a screw shank, one end of which has a head, and the outer periphery of the screw shank has external threads. The other end of the screw shank has a groove. A through-hole hollow channel is provided inside the hollow screw along its axial direction. A suture thread passes through the hollow screw through the hollow channel, and one end of the suture thread is connected to a needle tip.

[0005] As a preferred embodiment, a further technical solution of this utility model is: Preferably, a connecting part is provided on the suture line, the outer periphery of the connecting part is provided with external threads, and the inner wall of the hollow channel is provided with internal threads that are compatible with the external threads on the connecting part.

[0006] Preferably, the outer end of the head is provided with a first force-applying groove along the axial direction of the hollow screw.

[0007] Preferably, the connecting part is cylindrical.

[0008] Preferably, a second force-applying groove is provided at one end of the connecting part and along the axial direction of the connecting part.

[0009] Preferably, it also includes a hollow screwdriver, which includes a handle, a force-applying rod at one end of the handle, a force-applying part at the end of the force-applying rod, the force-applying part being adapted to a second force-applying groove, and a channel for the suture thread to pass through being provided axially in the handle and the force-applying rod.

[0010] Compared with the prior art, the present invention, which adopts the above technical solution, has the following outstanding features: by using hollow screws in combination with needle tips with sutures, it solves the problems of easy loosening and insufficient fixation strength of traditional hollow screws in patellar fracture fixation, and realizes purse-string suture with combined ligament repair, which significantly improves the stability of internal fixation of fractures and the convenience of surgical operation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the internal fixing system of the hollow screw with wire in an embodiment of this utility model; Figure 2 This is a schematic diagram of the hollow screw structure in an embodiment of this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the hollow screw structure in an embodiment of this utility model. Figure 2 ; Figure 4 This is a schematic diagram of the structure of the needle tip with thread in an embodiment of this utility model; Figure 5 This is a schematic diagram of the connecting part in an embodiment of this utility model; Figure 6 This is a schematic diagram of the hollow screwdriver in an embodiment of this utility model.

[0012] Explanation of reference numerals in the attached drawings: 1. Hollow screw; 2. Screw shank; 3. Head; 4. External thread; 5. Groove; 6. Hollow channel; 7. Seam thread; 8. Needle tip; 9. Connecting part; 10. First force-applying groove; 11. Second force-applying groove; 12. Handle; 13. Force-applying rod; 14. Force-applying part; 15. Channel. Detailed Implementation

[0013] The present invention will be further described below with reference to specific embodiments. The purpose of this description is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0014] like Figures 1 to 5 As shown, this embodiment provides a hollow screw internal fixation system with a suture, including a guide pin and a hollow screw 1. The hollow screw 1 includes a screw shank 2, one end of which is provided with a head 3, the outer periphery of which is provided with an external thread 4, and the other end of which is provided with a groove 5. A hollow channel 6 is provided through the hollow screw 2 along its axial direction, and a suture 7 passes through the hollow screw 1 through the hollow channel 6. One end of the suture 7 is connected to a needle tip 8.

[0015] In practice, a connecting part 9 is fitted onto the suture 7, and the outer periphery of the connecting part 9 is provided with external threads. The inner wall of the hollow channel 6 is provided with internal threads that are compatible with the external threads on the connecting part 9.

[0016] The outer end of the head 3 is provided with a first force-applying groove 10 along the axial direction of the hollow screw 1, which is used to screw the hollow screw 1 into the fracture site.

[0017] The connecting part 9 is cylindrical.

[0018] A second force-applying groove 11 is provided at one end of the connecting part 9 and along the axial direction of the connecting part 9; the second force-applying groove 11 is coaxial with the suture line 7. The aforementioned force-applying groove may adopt an internal hexagonal structure.

[0019] It also includes a hollow screwdriver for screwing the connecting part 9 into the hollow screw 1. The hollow screwdriver includes a handle 12, one end of which is provided with a force-applying rod 13, and the end of the force-applying rod 13 is provided with a force-applying part 14. The force-applying part 14 is adapted to the second force-applying slot 11. The handle 12 and the force-applying rod 13 are axially provided with a channel 15 for the suture 7 to pass through.

[0020] During implementation, the guide needle is made of medical stainless steel. One end is designed with a sharp cutting edge for easy puncture, and the other end is connected to an electric drill for easy operation. Its diameter is smaller than the inner diameter of the hollow channel in the hollow screw 1, and it is used to establish the anterior and posterior channels after fracture reduction.

[0021] The hollow screw 1 is made of titanium alloy or medical stainless steel and has an external thread 4 and a hollow channel 6. The external thread 4 is used to provide initial fixation force in the bone tissue. The hollow channel 6 has an internal thread that matches the external thread of the connecting part 9, so that the two can be tightly connected.

[0022] The component with threaded needle tip 8 is similar to the guide needle structure but has stronger functionality. One end of the suture 7 has a needle tip 8 (a micro-channel or groove can be set at the needle tail end to insert the suture 7 into the tail end of the guide needle to complete the fabrication). The suture 7 is fitted with a connecting part 9 that is threadedly connected to the hollow screw 1.

[0023] After fracture reduction, a guide pin is first used to establish a channel through the fracture site. Then, a hollow screw 1 is placed along the guide pin, and the guide pin is removed after confirming satisfactory positioning. Next, the needle tip 8 is passed through the hollow screw 1, and a hollow screwdriver is used to screw the connecting part 9 into the head of the hollow screw 1 (the tail end of the suture 7 is inserted into the channel 15 during screwing to prevent compression of the suture 7 during the screwing process), forming a complete and stable internal fixation system. This allows the two ends of the suture 7 to repair the surrounding ligaments around the fracture line using a figure-eight or purse-string suture method. This achieves ligament repair while simultaneously providing tight compression fixation of the fracture fragments, significantly enhancing the overall fixation strength. It is particularly suitable for fracture fixation in areas where the patella is relatively porous or subjected to high tension. The combined design of the fixation system ensures that fracture fixation relies not only on the threaded holding force of the hollow screw but also on the additional tension reinforcement provided by the suture, achieving multi-dimensional fixation.

[0024] The solutions provided by this utility model include: 1. Enhanced fixation strength: Traditional hollow screws rely solely on threaded fixation, while this utility model achieves a dual fixation effect of "screw + tension band or purse-string suture" through the synergistic effect of the hollow screw 1 and suture 7. 2. Significantly reduced fixation failure rate: For patients with osteoporosis, the fixation failure rate of traditional hollow screws is approximately 15-20%, while the failure rate can be reduced to below 5% using this utility model. 3. Reduced operation time and blood loss: Traditional methods for patellar fracture fixation require the simultaneous use of Kirschner wires and tension bands, making the surgery complex; this utility model completes guidance, fixation, and reinforcement in one procedure, shortening the average operation time by 25-30 minutes and reducing intraoperative blood loss by approximately 30-40 ml. 4. Improved surgical precision: The designed threaded needle tip 8 can be firmly locked inside the hollow screw 1, and the suture 7 can be matched with the hollow screw 1 for ligament suturing, resulting in more secure fixation of the patella and surrounding ligament complex. 5. Easy to operate: The system is designed to meet clinical operating habits. Doctors only need routine orthopedic surgery training to master the use of the system, resulting in a short learning curve.

[0025] The specific procedure includes: 1. Preoperative preparation: Routine disinfection and draping. Select an appropriate size cannulated screw fixation system with sutures based on the patient's patella size (usually a 4.0mm or 4.5mm diameter cannulated screw, 40-50mm in length; 2.0mm diameter guide pin; No. 1 absorbable suture). 2. Establishing the channel: After fracture reduction and temporary fixation, insert the guide pin vertically from one side of the patella, through the fracture line, until it emerges from the opposite cortex of the patella. Keep the guide pins parallel to each other and position them in the deep 1 / 3 of the central part of the patella. X-ray fluoroscopy confirms the guide pin position and satisfactory fracture reduction. 3. Inserting the cannulated screw: Then screw the cannulated screw (self-tapping screw, no pre-drilling required) along the guide pin. 4. Inserting the suture tip: Pass the suture tip through the cannulated screw, and then use a hollow screwdriver to screw the connecting part into the head of the cannulated screw until it is completely locked. 5. Fixation and reinforcement: Repair the injured ligaments around the patella using a figure-eight or purse-string suture technique with both ends of the suture, and then tie a knot for fixation. 6. Wound closure: Routinely irrigate the wound and suture in layers.

[0026] The above description is merely a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A hollow screw internal fixation system with a thread, comprising a guide pin and a hollow screw, the hollow screw comprising a screw shank, one end of the screw shank having a head, the outer periphery of the screw shank having external threads, and the other end of the screw shank having a groove; characterized in that, The hollow screw has a through-hole channel along its axial direction. A suture thread passes through the hollow screw through the hollow channel, and one end of the suture thread is connected to a needle tip.

2. The system according to claim 1, wherein the wire is made of a material selected from the group consisting of stainless steel, titanium, and cobalt-chromium alloy. A connecting part is fitted on the suture line. The outer periphery of the connecting part is provided with external threads, and the inner wall of the hollow channel is provided with internal threads that are compatible with the external threads on the connecting part.

3. The system according to claim 1, wherein the wire is made of a material selected from the group consisting of stainless steel, titanium, and cobalt-chromium alloy. The outer end of the head is provided with a first force-applying groove along the axial direction of the hollow screw.

4. The system according to claim 2, wherein the wire is made of a material selected from the group consisting of stainless steel, titanium, and cobalt-chromium alloy. The connecting part is cylindrical.

5. The system according to claim 4, wherein the wire is made of a material selected from the group consisting of stainless steel, titanium, and cobalt-chromium alloy. A second force-applying groove is provided at one end of the connecting part and along the axial direction of the connecting part.

6. The system of claim 5, wherein the wire is a shape memory alloy wire. It also includes a hollow screwdriver, which includes a handle, a force-applying rod at one end of the handle, a force-applying part at the end of the force-applying rod, and a force-applying part that is adapted to a second force-applying groove. The handle and the force-applying rod are axially provided with a channel for the suture to pass through.

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