CN108904024B - A self-breaking pressurized bolt assembly - Google Patents

Abstract

A self-breaking pressurized bolt assembly belongs to the technical field of orthopedic medical devices, and is used for externally pressurized reduction of tibial plateau fractures. The technical solution is: the diameter of the rear part of the screw of the pressure bolt is smaller than the diameter of the front part of the screw, the junction of the large-diameter section and the small-diameter section of the screw is an inclined annular connection section, and the rear part of the screw has an inner hole. The inner hole of the pressure nut is an unequal-diameter screw hole, the thread of the large-diameter screw hole at the front of the pressure nut matches the thread of the large-diameter section of the screw rod of the pressure bolt, and the small-diameter screw hole at the rear of the pressure nut The thread matches the thread of the small-diameter section of the screw rod of the pressurizing bolt, and the connection between the large-diameter screw hole at the front part of the pressurizing nut and the small-diameter screw hole at the rear part is a vertical annular plane. The present invention has simple structure, convenient operation and reliable effect, eliminates local soft tissue irritation caused by too long end of the pressure bolt, causes pain, limited movement, avoids various complications, and achieves a satisfactory reset effect.

Description

A self-breaking pressurized bolt assembly

technical field

The invention relates to a device for performing pressurized reduction from the outside when treating tibial plateau fractures, and belongs to the technical field of orthopedic medical devices.

Background technique

The advantage of minimally invasive surgery for tibial plateau fractures is that it can reduce surgical trauma and effectively reduce the incidence of intraoperative and postoperative complications. The key to its success is to achieve closed fracture reduction. The imaging manifestations of tibial plateau fractures are often split fractures of the tibial plateau, accompanied by articular surface collapse, and even metaphyseal comminution in severe cases. The operation is difficult and requires high surgical skills. Therefore, the treatment of tibial plateau fractures has always been a difficult point in trauma orthopedics. At present, minimally invasive reduction techniques for tibial plateau fractures are mainly for jacking up the collapsed and displaced fracture fragments, including arthroscopic-assisted minimally invasive jacking and reduction techniques and balloon forming minimally invasive reduction techniques, etc. However, tibial plateau often occurs Widening, if it cannot be accurately reset, the force line will not be correct, and the image will be curative. At present, the more effective method is to use bolts to pressurize, but there are problems such as that the end of the screw is too long after the pressurization, which stimulates the skin and causes local soft tissue pain. This problem has not been solved satisfactorily so far, so it is necessary to adopt innovative new instruments and bolts for fixing.

Contents of the invention

The technical problem to be solved by the present invention is to provide a self-breaking pressurized bolt assembly, which can be broken from the pressurized part after the pressurized bolt is tightened in place, so as to avoid the excessive length left at the end of the pressurized bolt and eliminate Local soft tissue irritation caused by excessively long bolt ends can cause pain and limited mobility.

The technical scheme that solves the above-mentioned technical problem is:

A self-disconnecting pressurized bolt assembly, which includes a pressurized bolt and a pressurized nut, the screw of the pressurized bolt is an unequal diameter screw, the diameter of the rear part of the screw is smaller than the diameter of the front part of the screw, and the large diameter section of the screw is connected to the The junction of the small-diameter section is an inclined annular connecting section. The small-diameter section of the screw, the annular connecting section, and the large-diameter section close to the annular connecting section have threads respectively. The end surface extends beyond the annular connecting section of the junction of the large diameter section and the small diameter section of the screw, and reaches the inside of the large diameter section, and the wall thickness between the annular connecting section and the inner hole is smaller than that between the rear part of the screw and the inner hole The inner hole of the pressure nut is an unequal-diameter screw hole, the thread of the large-diameter screw hole at the front of the pressure nut matches the thread of the large-diameter section of the screw rod of the pressure bolt, and the rear of the pressure nut The thread of the small-diameter screw hole matches the thread of the small-diameter section of the screw rod of the pressure bolt, and the connection between the large-diameter screw hole at the front of the pressure nut and the small-diameter screw hole at the rear is perpendicular to the central axis of the pressure nut. circular plane.

In the aforementioned self-disconnecting pressurized bolt assembly, the front end of the pressurized nut is located at the external pressurized part of the tibial plateau at the rear of the pressurized bolt, and the annular plane at the junction of the large-diameter screw hole and the small-diameter screw hole of the pressurized nut It is opposite to the rear end of the annular connection section of the pressure bolt.

The above-mentioned self-disconnecting pressurized bolt assembly also has a twist-off screwdriver. The twist-off screwdriver is composed of a handle, a cone rod, and a cone head. The handle is connected with the cone rod and the cone head in sequence. Hexagonal, the hexagonal shape of the inner hole matches the outer peripheral shape of the pressurized nut.

The beneficial effects of the present invention are:

In the present invention, an inner hole is designed at the back of the pressure bolt, and there is a small-diameter screw outside the inner hole. When the pressure nut pressurizes the tibial plateau, the screw of the pressure bolt will be connected from the unequal diameter of the pressure bolt. Automatically cut off at the end to prevent the end of the pressure bolt from being too long.

The present invention is the first to pressurize tibial plateau fractures, which solves the common problem that the end of the compression bolt is too long after using the compression bolt to pressurize, and eliminates the local soft tissue stimulation pain and movement caused by the excessive length of the bolt end. Limitation and other conditions are conducive to the recovery of patients. The invention is simple in structure, easy to operate, reliable in effect, can maintain the pressurized state of the pressurized bolts, avoid various complications, and achieve a satisfactory reduction effect for tibial fractures, and is the development of minimally invasive techniques in the treatment of tibial plateau fractures. It has provided technical support, and has good promotion and use and invention transformation value in the industry.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the combined state schematic diagram of Fig. 1;

Fig. 3 is a schematic diagram of the use state of the present invention.

The marks in the figure are as follows: pressure bolt 1, pressure nut 2, large diameter section 3, small diameter section 4, annular connecting section 5, inner hole 6, large diameter screw hole 7, small diameter screw hole 8, annular plane 9. Twist and break screwdriver 10, handle 11, cone rod 12, cone head 13, tibia 14.

Detailed ways

The self-breaking pressure bolt assembly of the present invention is composed of a pressure bolt 1 , a pressure nut 2 and a twist screwdriver 10 .

Figures 1 and 2 show that the screw of the pressurizing bolt 1 is an unequal-diameter screw, the diameter of the rear part of the screw is smaller than the diameter of the front part of the screw, and the junction of the large diameter section 3 and the small diameter section 4 of the screw is an oblique annular connection Section 5, the small diameter section 4 of the screw rod, the annular connecting section 5 and the large diameter section 3 close to the annular connecting section 5 are respectively threaded for screwing in the pressurized nut 2 .

Figures 1 and 2 show that the rod body at the rear of the screw of the pressurizing bolt 1 has an inner hole 6, and the inner hole 6 extends from the end surface of the screw to the annular connecting section 5 beyond the junction of the large-diameter section 3 and the small-diameter section 4 of the screw, Reaching the inside of the large-diameter section 3, the wall thickness between the annular connecting section 5 and the inner hole 6 is smaller than the wall thickness between the rear part of the screw and the inner hole 6, and will be disconnected when subjected to greater pressure. The purpose of adopting the inner hole 6 structure at the rear of the pressure bolt 1 is to break the pressure bolt 1 from the rear. On the one hand, the inner hole 6 greatly reduces the strength of the screw and reduces the difficulty of breaking. The hole wall of the annular connection section 5 is an inclined annular wall, the wall thickness is very thin, and can be cut off by pressure nut 2 .

Figures 1 and 2 show that the inner holes of the pressurizing nut 2 are unequal diameter screw holes. The front part of the pressurizing nut 2 is a large diameter screw hole 7, and the rear part is a small diameter screw hole 8. The thread of the large-diameter screw hole 7 matches the thread of the large-diameter section 3 of the screw rod of the pressurizing bolt 1, and the thread of the small-diameter screw hole 8 at the rear of the pressurizing nut 2 matches the thread of the small-diameter section 4 of the screw rod of the pressurizing bolt 1. match. When the pressure nut 2 is connected with the pressure bolt 1, the large-diameter section 3 of the pressure bolt 1 is screwed into the large-diameter screw hole 7 of the pressure nut 2, and the small-diameter section 4 of the pressure bolt 1 is screwed into the In the small-diameter screw hole 8 of the pressure nut 2.

Figures 1 and 2 show that the junction of the large-diameter screw hole 7 at the front of the pressure nut 2 and the small-diameter screw hole 8 at the rear is an annular plane 9 perpendicular to the central axis of the pressure nut 2 . The function of the annular plane 9 is that when the pressurizing nut 2 is screwed into the pressurizing bolt 1, when the annular plane 9 of the pressurizing nut 2 reaches the annular connection section 5 of the pressurizing bolt 1, the annular plane 9 moves forward , pressurize the annular connecting section 5, when the pressure is large enough, the annular wall of the annular connecting section 5 will be cut off, so as to achieve the purpose of cutting off the pressurizing bolt 1.

Fig. 1 shows that it also has a twist screwdriver 10, the twist screwdriver 10 is made up of a handle 11, a cone rod 12, and a cone head 13, the handle 11 is connected with the cone rod 12, the cone head 13 in sequence, and the front end of the cone head 13 has an inner hole , the inner hole is hexagonal, and the hexagonal shape of the inner hole matches the outer peripheral shape of the pressurized nut 2.

Figures 2 and 3 show that in order to cut off the pressure bolt 1 in time when the pressure nut 2 reaches the bone wall of the tibia 14, the length of the pressure bolt 1 needs to be measured before the operation. and the thickness of the pressure nut 2, so that when the front end of the pressure nut 2 is located at the external pressure of the tibial plateau at the rear of the pressure bolt 1, the large-diameter screw hole 7 and the small-diameter screw hole 8 of the pressure nut 2 The annular plane 9 at the connection is exactly opposite to the rear end of the annular connection section 5 of the pressure bolt 1 . Therefore the pressure bolt 1 and the pressure nut 2 of the present invention should be multiple groups, the length of the multiple groups of pressure bolt 1 and the thickness of the pressure nut 2 are different, and can be selected according to the patient's condition in the operation.

Fig. 3 shows that the use process of the present invention is as follows:

Firstly, according to the injury and reduction of the patient's tibia 14, an appropriate group of compression bolts 1 and compression nuts 2 are selected to reset the damaged tibia 14, and the compression bolt 1 is screwed in from one side of the tibia 14, and the The bones are joined together;

Then, screw the compression nut 2 into the end where the compression bolt 1 passes through the tibia 14, and the large-diameter screw hole 7 of the compression nut 2 is sleeved on the large-diameter section 3 of the compression bolt 1, and the compression nut 2 The small-diameter screw hole 8 is sleeved on the small-diameter section 4 of the pressure bolt 1. Twist off the cone head 13 front end inner hole of the screwdriver 10 to cooperate with the outer circumference of the pressurizing nut 2 to rotate the pressurizing nut 2 forward.

When the front end face of the pressurizing nut 2 is close to the bone wall of the tibia 14, the annular plane 9 of the pressurizing nut 2 reaches the annular connection section 5 of the pressurizing bolt 1, and the screwdriver 10 is continued to be rotated to pressurize. The annular plane 9 of the nut 2 continues to move forward, pressurizing the annular connecting section 5 . The annular wall of the annular connection section 5 is cut off.

After cutting off the annular connecting section 5 of the pressurizing bolt 1, take out the small diameter section 4 of the broken pressurizing bolt 1, and continue to turn the pressurizing nut 2, so that the pressurizing nut 2 can achieve proper pressurization on the side wall of the tibia 14 state to achieve a satisfactory reset effect.

An example of the present invention is as follows:

The length of the large-diameter section 3 of the pressurizing bolt 1 is 55-120 mm, and the diameter is 7 mm; the length of the small-diameter section 4 is 50 mm, and the diameter is 4 mm; the length of the annular connecting section 5 is 2.5 mm, and the wall thickness is 0.5 mm .

The outer diameter of the pressurizing nut 2 is 10 mm, the diameter of the large-diameter screw hole 7 is 7 mm, and the length is 3 mm; the diameter of the small-diameter screw hole 8 is 4 mm, and the length is 2.5 mm.

Claims (3)

1. The utility model provides a self-breaking type pressure bolt subassembly which characterized in that: it includes pressure bolt (1), pressure nut (2), the screw rod of pressure bolt (1) is the screw rod of inequilateral footpath, the diameter at screw rod rear portion is less than the anterior diameter of screw rod, the cyclic annular linkage segment (5) of the junction of big diameter section (3) and little diameter section (4) of screw rod, cyclic annular linkage segment (5), big diameter section (3) that are close to cyclic annular linkage segment (5) have the screw thread respectively, the body of rod has hole (6) at screw rod rear portion, hole (6) extend to cyclic annular linkage segment (5) that exceed big diameter section (3) and little diameter section (4) junction of screw rod from the screw rod terminal surface, reach the inside of big diameter section (3), the wall thickness between cyclic annular linkage segment (5) and hole (6) is less than the wall thickness between screw rod rear portion and hole (6), the hole of pressure nut (2) is the inequilateral footpath screw hole, the screw thread of the large-diameter screw hole (7) at the front part of the pressure nut (2) is matched with the screw thread of the large-diameter section (3) of the screw rod of the pressure bolt (1), the screw thread of the small-diameter screw hole (8) at the rear part of the pressure nut (2) is matched with the screw thread of the small-diameter section (4) of the screw rod of the pressure bolt (1), and the joint of the large-diameter screw hole (7) at the front part of the pressure nut (2) and the small-diameter screw hole (8) at the rear part is an annular plane (9) vertical to the central axis of the pressure.

2. The self-breaking compression bolt assembly of claim 1, wherein: the front end face of the pressure nut (2) is positioned at the external pressure part of the tibial plateau at the rear part of the pressure bolt (1), and the annular plane (9) at the joint of the large-diameter screw hole (7) and the small-diameter screw hole (8) of the pressure nut (2) is opposite to the rear end of the annular connecting section (5) of the pressure bolt (1).

3. The self-breaking compression bolt assembly of claim 1, wherein: the screw driver is further provided with a twist-off screw driver (10), the twist-off screw driver (10) is composed of a handle (11), a conical rod (12) and a conical head (13), the handle (11), the conical rod (12) and the conical head (13) are sequentially connected, an inner hole is formed in the front end of the conical head (13), the inner hole is hexagonal, and the hexagonal shape of the inner hole is matched with the peripheral shape of the pressurizing screw cap (2).