CN204931821U - Bridge joint internal fixation system outside proximal tibia - Google Patents

Abstract

The utility model tibial proximal lateral bridging internal fixation system comprises head tibial proximal lateral special-shaped block 1 and bar bridging internal fixation system (comprising U-shaped rod 5, fixed block 4, fixed block 6), and locking screw 2, ladder screw 3. The special-shaped block 1 on the outside of the proximal end of the tibia is in the shape of a golf club head and has a certain radian, which can fit well with the proximal end of the tibia. There is a locking threaded hole 7 at the head end, which is fixed with the bone through the locking screw 2. There are two holes 9 inside the end to cooperate with the U-shaped rod 5, and the end is provided with a stepped threaded hole, which can be reliably fixed by the stepped screw 3 and the U-shaped rod; several fixed blocks 4 and 6 are assembled on the U-shaped rod, and the fixed block Secured by locking screws and rods. ? The connecting rod of the utility model adopts a U-shaped rod to prevent the fixed block from slipping off from the end of the connecting rod. The design of several card slots in the head and the main body increases the contact area with the screw, so that the U-shaped rod and the special-shaped block and the fixed block The connection achieves a pin-fixed reliable connection.

Description

Proximal Lateral Bridging Internal Fixation System

technical field

The utility model discloses a tibial proximal lateral bridging internal fixation system, which belongs to the technical field of internal fixation implants for fractures, and is a medical device for treating tibial fractures and performing reduction and fixation of broken ends.

Background technique

With the rapid development of society, people inevitably suffer from accidental injuries in life and work, resulting in fractures, and tibial fractures are a common clinical fracture type. In most cases, tibial fractures are caused by high-energy injuries. The fracture forms are complicated and the treatment is difficult. Traditional surgical methods mainly use steel plates, intramedullary nails, and external fixation brackets for fixation. Plate fixation requires extensive stripping of the periosteum, often resulting in adverse consequences such as fracture nonunion; while intramedullary nails and external fixation brackets can effectively control fracture shortening, angulation, and rotational deformity, but it is cumbersome to complete the above operations, and external fixation Stents are prone to be complicated by nail tract infection, which affects the life and limb function of patients. In addition, the study found that the traditional surgical method has the effect of stress shielding on the fracture site, so that the physiological load cannot effectively pass through the bone of the plate fixation site, reducing the physiological stimulation of the site, causing the collagen fibers in the fixed segment to be disordered and the structure Destruction, local cortical bone reduction, weakened bone strength, osteoporosis, decreased compressive performance, and postoperative fracture nonunion are prone to occur. Due to the above shortcomings, people began to reflect on the current treatment point of view, and then gradually established a biological point of view, that is, a biological and reasonable point of view of osteosynthesis (biological osteosynthesis, BO). The core of BO is to pay full attention to the protection of local soft tissue blood supply and strong fracture fixation without pressure. In the long-term clinical exploration, the advantages and disadvantages of the traditional surgical method were maximized, and a proximal tibial lateral bridge internal fixation system was designed, which combined the proximal lateral tibial special-shaped block and the bridge internal fixation, and achieved good fixation results.

Contents of the invention

The purpose of the utility model is to propose a bridge internal fixation system with convenient operation and good biological performance for the inadequacy of the traditional operation method for treating tibial fractures.

The utility model is realized by adopting the following scheme:

1) Includes head and shaft, locking screw, stepped screw. The head is a special-shaped block outside the proximal end of the tibia, and the rod is a bridging internal fixation system, including a fixation block and a U-shaped connecting rod.

2) The head end of the special-shaped block on the outer side of the proximal end of the tibia is designed according to the anatomical structure of the human bone. It is in the shape of a golf club head and has a certain radian, which can fit well with the tibia. It is a conical multi-line threaded hole, which can achieve reliable fixation with the tibia; there is a locking threaded hole in the middle.

3) There is a hole inside the tail end of the special-shaped block outside the proximal end of the tibia to cooperate with the U-shaped connecting rod. At the same time, a stepped threaded hole is set at the end of the special-shaped block, and the special-shaped block and the connecting rod are fixed by stepped screws to prevent the loose connection between the special-shaped block and the connecting rod. A reliable connection for both.

4) The head of the U-shaped rod is grooved so that it fits closely with the head end of the stepped screw, increasing the friction between the two, and at the same time, the screw is clamped through the groove to make the fixing effect better; the main part of the U-shaped rod A plurality of draw-in grooves are arranged, and when the locking screw is loaded into and locked, the contact surface with the U-shaped bar increases, thereby increasing the frictional force, so that the connection between the fixing block and the U-shaped bar is not easy to loosen.

5) The fixed block and the connecting rod are slidably matched, and the position of the fixed block can be adjusted according to the needs of the operation, so that it can maintain the best relative position with the fracture line, avoid the stress concentration that occurs in traditional surgical methods, and promote fracture healing.

6) In order to prevent the fixing block from protruding from one end of the connecting rod, the connecting rod adopts a U-shaped rod.

7) The material of the present utility model is titanium alloy or pure titanium.

The beneficial effects of the utility model:

1) The special-shaped block on the outside of the proximal tibia of the head of the utility model is designed according to the anatomical structure of the human bone. It is in the shape of a golf club head and has a certain radian, and there are locking threaded holes on it. The locking threaded holes are designed as conical multi-lines Threaded holes can achieve a good fit and fixation with the tibia;

2) There is a hole inside the end of the special-shaped block to cooperate with the U-shaped connecting rod. At the same time, a stepped threaded hole is set at the end of the special-shaped block. Connection; In addition, the head of the U-shaped rod is slotted so that it fits closely with the head end of the stepped screw, increasing the friction between the two, and at the same time clamping the screw through the groove to make the fixing effect better;

3) The sliding fit design of the fixed block and the connecting rod makes the operation more flexible. By adjusting the position of the fixed block, it can maintain the best relative position with the fracture line; in order to prevent the fixed block from protruding from one end of the connecting rod , the connecting rod adopts U-shaped rod.

4) The special-shaped block designed for a specific part combines the advantages of the traditional steel plate head design, and at the same time avoids its shortcomings. It can effectively fix the bone at the site, restore the physiological stimulation of the site, restore its physiological function, and promote fracture healing. The lateral proximal tibial bridging internal fixation system maximizes the strengths and circumvents the weaknesses of the traditional surgical method, overcomes the shortcomings of the prior art, improves the biomechanical properties of the surgical site, and reduces the occurrence of postoperative complications. At the same time, the design is easy to operate, shortens the operation time, speeds up the fracture healing time, greatly reduces the pain of the patient, and makes them full of confidence in the life after recovery; in addition, the design also brings medical workers Work convenience and improve the success rate of surgery.

Description of drawings

Fig. 1 is the overall assembly diagram of the bridging internal fixation system at the proximal end of the tibia outside of the utility model;

Figure 2 is a cross-sectional view of the connection between the special-shaped block on the outer side of the proximal end of the tibia, the U-shaped rod and the stepped screw;

Fig. 3 is the front view of the special-shaped block outside the proximal end of the tibia;

Fig. 4 is A-A sectional view of Fig. 3

Fig. 5 is the C-C sectional view of Fig. 3;

Fig. 6 is a D-D sectional view of Fig. 3;

Fig. 7 is the front view of U-shaped bar;

Figure 8 is a front view of a single locking threaded hole fixing block;

Fig. 9 is a B-B sectional view of Fig. 8;

Figure 10 is a front view of the double locking threaded hole fixing block;

Fig. 11 is the E-E sectional view of Fig. 10;

Figure 12 is a front view of the stepped screw;

Figure 13 is a front view of the locking screw;

Fig. 14 is a left side view of Fig. 13 .

detailed description:

With reference to accompanying drawing 1-14, as shown in Fig. 1 general assembly outside special-shaped block 1 of proximal end of tibia (Fig. 3) according to the anatomical structure of human skeleton design is golf club head shape and has certain radian, and its head end has locking threaded hole 7. The locking screw 2 is fixed to the bone. There are two holes 7 inside the tail end to cooperate with the U-shaped rod 5 (Fig. 7). At the same time, there is a stepped threaded hole 8 at the tail end. The U-shaped rod realizes reliable fixation; several fixed blocks 4 (Fig. 8) and fixed blocks 6 (Fig. 10) are assembled on the U-shaped rod, and the fixed blocks are fixed to the rod by locking screws (Fig. 13).

In the utility model, there is a hole inside the tail end of the outer side of the proximal end of the tibia to cooperate with the U-shaped connecting rod. At the same time, the tail end of the special-shaped block is provided with a stepped threaded hole. The connecting rod is loosely connected to achieve a reliable connection between the two; in addition, the head of the U-shaped rod is slotted so that it fits closely with the head end of the stepped screw, increasing the friction between the two, and at the same time clamping the screw through the groove makes Its fixation effect is better; the head end of the special-shaped block can be loaded with the required number of locking screws according to the fracture situation, so that it fits and fixes well with the tibia.

Before the operation, put the single-locking threaded hole fixing block and the double-locking threaded hole fixing block into the U-shaped rod. Since the fixing block and the U-shaped rod are in sliding fit, the position of the fixing block can be adjusted arbitrarily according to the position of the fracture line during the operation. Keep it in the best relative position to the fracture line, and fix it with locking screws after adjustment to avoid stress concentration in traditional surgical methods and promote fracture healing; the main part of the U-shaped rod is provided with several slots, and the locking screws are inserted into the When locking, the contact surface with the U-shaped rod increases, thereby increasing the friction force, so that the connection between the fixed block and the U-shaped rod is not easy to loosen.

Working principle and characteristics of the utility model:

1) The special-shaped block designed for a specific part of the lateral proximal tibial bridging internal fixation system combines the advantages of the traditional steel plate head design, and at the same time avoids its shortcomings. The occluded defect enables the physiological load to pass through the bone of the fixed part effectively, restores the physiological stimulation of the part, restores its physiological function, and promotes fracture healing. At the same time, the design is easy to operate, shortens the operation time, speeds up the fracture healing time, greatly reduces the pain of the patient, and makes them full of confidence in the life after recovery; in addition, the design also brings medical workers Work convenience and improve the success rate of surgery.

2) Structurally, the special-shaped block is designed according to the anatomy of the human bone, which achieves a good fit with the proximal end of the tibia. The special-shaped block is connected with the U-shaped rod through the stepped screw to achieve the effect of pin fixation, and the connection is more reliable; The rod adopts a U-shaped rod, which prevents the fixing block from slipping off from the end of the connecting rod. The design of several slots in the head of the U-shaped rod and the main body increases the contact area between it and the screw, thereby increasing the friction force and making the U-shaped rod The connection between the rod and the special-shaped block and the fixed block is more reliable, which reduces the risk of loosening and slippage after operation.

Claims (8)

1. A bridging internal fixation system at the proximal end of the tibia, characterized in that: the system is composed of a head, a shaft, locking screws, and stepped screws, the head is a special-shaped block at the outer side of the proximal tibia, and the shaft includes a single locking threaded hole Fixing block, double locking threaded hole fixing block, U-shaped rod. 2. The bridging internal fixation system on the outside of the proximal tibia according to claim 1, characterized in that: the head end of the special-shaped block on the outside of the proximal tibia is in the shape of a golf club head, and there are locking threaded holes on it, and there are two holes inside the tail end. The hole is matched with the connecting rod, and there is a stepped threaded hole at the end. 3. The bridging internal fixation system for the lateral proximal end of the tibia according to claim 2, characterized in that: the locking threaded hole at the head end of the special-shaped block is a conical multi-line threaded hole. 4. The bridge internal fixation system for the lateral proximal end of the tibia according to claim 2, characterized in that: the number of stepped threaded holes at the tail end of the special-shaped block is 1-2. 5. The bridging internal fixation system at the lateral proximal end of the tibia according to claim 1, characterized in that: the head of the U-shaped rod is slotted to match the head of the stepped screw. 6. The bridging internal fixation system at the proximal lateral end of the tibia according to claim 1, characterized in that: the main body of the U-shaped rod has several grooves, which are matched with the head of the locking screw. 7. The bridge internal fixation system for the lateral proximal end of the tibia according to claim 1, characterized in that: there are two parallel through holes inside the single locking threaded hole fixation block that are slidably fitted with U-shaped rods. 8. The bridge internal fixation system for the lateral proximal end of the tibia according to claim 1, characterized in that: there are two parallel through holes inside the double-locking threaded hole fixation block that are slidably fitted with U-shaped rods.