CN204072300U - A kind of bone screw - Google Patents

Abstract

The utility model relates to a bone screw, which belongs to the technical field of surgical medical instruments. The bone screw includes a screw rod and a screw thread. One end of the screw rod is a head end that can be screwed in by a sleeve tool, and the other end of the screw rod is a tip end. The head end is a circular structure. There is an inner hexagonal groove, the side of the head end is provided with a through hole, and the through hole communicates with the inner hexagonal groove; the tip is a tapered structure, and the tip is also provided with a self-tapping groove. The utility model has a simple structure, and the through hole on the side of the head end provides a firm fulcrum for suturing and fixing the tendon tissue.

Description

a bone screw

technical field

The utility model relates to a bone screw, which belongs to the technical field of surgical medical instruments.

Background technique

There are two commonly used fixation methods for the treatment of extremity fractures: external fixation and internal fixation. External fixation methods include small splints, plaster bandages, external fixation brackets, traction brake fixation, etc., while internal fixation methods include surgical incision of muscle tissue, placement of steel plates, steel needles, bone screws, etc.

Proximal humeral fracture is one of the common fractures in clinical practice. Due to its complex types and poor healing, it has become a difficult point in trauma orthopedic treatment. At present, internal fixation of the proximal humerus fractures is often performed with plate fixation. The plate fixation is placed on the surface of the bone at the position of the tension band. Especially when the medial support of the bone is damaged, the risk of plate fracture is high. Intramedullary nails are more and more favored by orthopedic surgeons due to their advantages of less trauma and stress dispersion. However, due to the complexity of proximal humerus fractures in clinical practice, the distribution of fracture lines is unpredictable. There is no universal screw function at the level, so the application of the intramedullary nail is limited to the proximal humerus to a certain extent.

The bone screw currently used in orthopedic surgery includes a nail body and a nail cap. The outer surface of the nail body is provided with a long screw thread. Locked, the bone screw is not easy to loosen inside the bone. However, when the implanted bone screw is close to the fracture line or just in the area of the fracture line, the fracture fragments are easy to loosen, and the effect of fixing the fracture fragments is reduced, which is not conducive to the growth of the bone and affects the final healing effect.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art and propose a bone screw, which has a simple structure, and the through hole on the side of the head end provides a firm fulcrum for suturing and fixing the tendon tissue.

The purpose of this utility model is achieved through the following technical solutions:

A bone screw, comprising a screw and a screw thread. One end of the screw is a head end that can be screwed in by a sleeve tool, and the other end of the screw is a tip. The head end is a circular structure. There is an inner hexagonal groove at the end, and a through hole is provided on the side of the head end, and the through hole communicates with the inner hexagonal groove; the tip is a tapered structure, and the tip is also provided with a self-tapping groove.

Preferably, the thread comprises a shallow thread and a deep thread connected to each other, the shallow thread is close to the head end, the deep thread is close to the tip, the outer diameter of the shallow thread is the same as that of the deep thread, and the inner diameter of the shallow thread is larger than that of the deep thread inner diameter.

Preferably, a transitional thread is provided between the shallow thread and the deep thread, the inner diameter of the transitional thread is between the inner diameter of the shallow thread and the inner diameter of the deep thread, and decreases along the direction from the shallow thread to the deep thread .

Further preferably, there are more than two through holes.

Further preferably, the groove surface of the self-tapping groove is an arc surface.

Further preferably, the bone screw is made of titanium alloy.

Beneficial effects of the utility model: the utility model is a bone screw. The side of the head end of the bone screw is provided with a through hole, which provides a firm fulcrum for the suture to suture and fix the tendon tissue, and reliably repairs the damaged tendon tissue. Stabilize the fracture block, which is conducive to the healing of the fracture; the tip of the bone screw is also provided with a self-tapping groove, which can speed up the screw insertion speed; the deep thread is used for cancellous bone segments, which has better The holding force near the tail is a shallow thread structure, which is used to fix on the cortical bone segment; a transitional thread is provided between the shallow thread and the deep thread, so that the utility model can use the screw body section where the decisive thread is located Provide buffer and transition for the diameter reduction of shallow thread and deep thread, so that on the one hand, the processing operation of the bone screw is more convenient, and on the other hand, it can reduce the risk of fracture at the junction between shallow thread and deep thread during the operation. This is because the direct diameter reduction between the shallow thread and the deep thread is easy to break at the junction.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model.

Fig. 1 is a structural schematic diagram of a bone screw of the present invention;

Figure 2 is a top view of the head end;

Fig. 3 is a K-direction view of the tip;

Fig. 4 is a partial sectional view of I in Fig. 1;

Marks in the figure: 1-head end, 2-through hole, 3-shallow thread, 4-deep thread, 5-tip, 6-self-tapping groove, 7-transitional thread, 8-inner hexagonal groove.

Detailed ways

    It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figures 1 to 4, a bone screw includes a screw rod and a screw thread, one end of the screw rod is a head end 1 that can be screwed in by a set tool, and the other end of the screw rod is a tip 5, and the head end 5 is a circular structure, with an inner hexagonal groove 8 at the head end 5, and a through hole 2 is provided on the side of the head end 1, and the through hole 2 communicates with the inner hexagonal groove 8; 5 is a tapered structure, and the tip part 5 is also provided with a self-tapping groove 7, and the groove surface of the self-tapping groove 7 is an arc surface. The threads include interconnected shallow threads 3 and deep threads 4, the shallow threads 3 are close to the head end 1, the deep threads 4 are close to the tip 5, the outer diameters of the shallow threads 3 and the deep threads 4 are the same, and the outer diameters of the shallow threads 3 are The inner diameter is greater than the inner diameter of the deep thread 4; a transition thread 7 is also provided between the shallow thread 3 and the deep thread 4, and the inner diameter of the transition thread 7 is between the inner diameter of the shallow thread 3 and the inner diameter of the deep thread 4, Decrease along the direction from the shallow thread 3 to the deep thread 4 .

Bone screws are made of titanium alloy.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (6)

1. a bone screw, comprises screw rod and screw thread, and described screw rod one end is the cephalic par (1) that can carry out screwing in for sheathed instrument operation, and the other one end of described screw rod is point (5), it is characterized in that:

Described cephalic par (1) is circular configuration, has interior hexagonal groove (8) at cephalic par (1), and the side of described cephalic par (1) is provided with through hole (2), and described through hole (2) communicates with interior hexagonal groove (8);

Described point (5) is pyramidal structure, and described point (5) is also provided with self tapping groove (6).

2. bone screw according to claim 1, it is characterized in that: described screw thread comprises interconnective shallow thread (3) and deep thread (4), described shallow thread (3) is near cephalic par (1), described deep thread (4) is near point (5), shallow thread (3) is identical with the external diameter of deep thread (4), and the internal diameter of shallow thread (3) is greater than the internal diameter of deep thread (4).

3. bone screw according to claim 2, it is characterized in that: between described shallow thread (3) and deep thread (4), be also provided with transition screw thread (7), the internal diameter of described transition screw thread (7) is between the internal diameter and the internal diameter of described deep thread (4) of described shallow thread (3), successively decreases in the direction along described shallow thread (3) to deep thread (4).

4. bone screw according to claim 1, is characterized in that: described through hole (2) has more than 2.

5. bone screw according to claim 1, is characterized in that: the groove face of described self tapping groove (6) is cambered surface.

6. the bone screw according to any one of claim 1 to 5, is characterized in that: described bone screw is made up of titanium alloy.