CN207236837U - Bone screw - Google Patents

Abstract

The utility model discloses a kind of bone screw, including shank of screw and screw cap, the shank of screw includes the screw tip of setting at one end and the screw root for being arranged on the other end, and the threaded portion of attachment screw tip and screw root, the screw root is connected with screw cap, the threaded portion includes first threaded area adjacent with threaded tip and second threaded area adjacent with screw root, and first threaded area and the second screw thread section are equipped with clear area.The utility model is combined by the screw thread of the second threaded area with the threaded hole on bone plate, bone screw and bone plate is set to form an entirety, bone screw is avoided because stress problem, there is a phenomenon where angle offset on bone plate, so as to influence the union situation of patient.Simultaneously as the change of the first threaded area thread pitch so that bone screw can give the pressure of bone bigger, play the role of tensing pressurization, promote the healing of bone, mitigate the pain of patient.

Description

bone screw

technical field

The utility model relates to the technical field of medical instruments, in particular to a bone screw.

Background technique

In orthopedic surgery, it is often necessary to use bone plates and bone screws to fix the fracture site so that the fractured bones can be recombined. This bone screw usually needs to be kept in the patient's body for a long time, but after the bone screw is fixed to the bone plate, due to reasons such as the patient's movement, the bone screw will slip in the threaded hole of the bone plate, affecting the healing of the fracture.

However, the existing bone screws are basically made of metal materials, which have sufficient strength and toughness, strong resistance to bending and torsion, but they can only play a role of fixing, and cannot pull the two fracture surfaces of the broken bone into tightness. The effect of pressurization.

Utility model content

In order to solve the above problems, the utility model provides a bone screw.

The technical scheme that the utility model takes is:

The bone screw of the present utility model includes a screw rod and a screw cap. The screw rod includes a screw tip arranged at one end, a screw root arranged at the other end, and a threaded part connecting the screw tip and the screw root. The screw root is connected with the screw cap, and the threaded part includes a first threaded area adjacent to the thread tip and a second threaded area adjacent to the screw root, and the first threaded area and the second threaded area are set There is a blank area.

The first threaded area is in the shape of a conical thread, and the thread pitch of the first threaded area gradually decreases from the tip of the screw to the blank area.

The second threaded area is in the shape of a cylindrical thread, and the thread pitch of the second threaded area is consistent from the blank area to the screw root, and the thread pitch of the second threaded area is smaller than the thread pitch of the first threaded area.

The helical direction of the first threaded zone is the same as the helical direction of the second threaded zone.

The advantages and positive effects that the utility model has are:

The utility model combines the thread of the second thread area with the threaded hole on the bone plate, so that the bone screw and the bone plate form a whole, and avoids the angle deviation of the bone screw on the bone plate due to the force problem, thereby affecting Patient's fracture healing status. At the same time, due to the change of the thread pitch in the first threaded area, the bone screw can exert greater pressure on the bone, play a role of tension and pressure, promote the healing of the bone, and relieve the pain of the patient.

Description of drawings

Fig. 1 is the structural representation of the utility model.

in:

1: Screw shaft 2: Screw cap

3: Screw tip 4: Screw root

5: threaded part 6: first threaded area

7: Second thread area 8: Blank area.

Detailed ways

The utility model is described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figure 1, the bone screw of the present utility model includes a screw rod 1 and a screw cap 2, and the screw rod 1 includes a screw tip 3 arranged at one end and a screw root 4 arranged at the other end, and a connecting screw The threaded part 5 of the tip 3 and the screw root 4, the screw root 4 is connected with the screw cap 2, and the threaded part 5 includes the first threaded area 6 adjacent to the thread tip 3 and the screw root 4 Adjacent to the second threaded area 7 , a blank area 8 is provided between the first threaded area 6 and the second threaded area 7 .

The first threaded area 6 is in the shape of a conical thread, and the thread pitch of the first threaded area 6 gradually decreases from the screw tip 3 to the blank area 8 .

The second threaded area 7 is in the shape of a cylindrical thread, and the thread pitch of the second threaded area 7 is consistent from the blank area 8 to the screw root 4, and the thread pitch of the second threaded area 7 is smaller than that of the first threaded area 6 the thread pitch.

The helical direction of the first threaded zone 6 is the same as the helical direction of the second threaded zone 7 .

In the utility model, during the operation, the screw point 3 of the bone screw is inserted from the threaded hole of the bone plate until it is inserted into the patient's bone. As the screw point 3 goes deep, the first threaded area 6 enters the patient's bone. Since the thread pitch of the first threaded area 6 gradually decreases from the screw tip 3, the locking ability is increased, so that the bone screw can exert greater pressure on the bone and play a role of tension and compression. When the bone screw is fully inserted, the thread of the second threaded area 7 is combined with the thread of the bone plate screw hole, so that the bone screw and the bone plate form a whole, so that the fractured bones are better connected together, and the fracture can be faster. cure.

The utility model combines the thread of the second thread area with the threaded hole on the bone plate, so that the bone screw and the bone plate form a whole, and avoids the angle deviation of the bone screw on the bone plate due to the force problem, thereby affecting Patient's fracture healing status. At the same time, due to the change of the thread pitch in the first threaded area, the bone screw can exert greater pressure on the bone, play a role of tension and pressure, promote the healing of the bone, and relieve the pain of the patient.

The embodiments of the present utility model have been described in detail above, but the content described is only a preferred embodiment of the present utility model, and cannot be considered as limiting the implementation scope of the present utility model. All equal changes and improvements made according to the application scope of the utility model should still belong to the scope covered by the patent of the utility model.

Claims (2)

1. a kind of bone screw, including shank of screw and screw cap, it is characterised in that：The shank of screw includes setting at one end Screw tip and the screw root for being arranged on the other end, and the threaded portion of attachment screw tip and screw root, the spiral shell Nail root is connected with screw cap, and the threaded portion includes first threaded area adjacent with threaded tip and adjacent with screw root The second threaded area, first threaded area and the second screw thread section are equipped with clear area；First threaded area is in circular cone Shape of threads, the thread pitch of first threaded area progressively reduce from screw tip to clear area；Second threaded area In cylindrical thread shape, the thread pitch of second threaded area is consistent from clear area to screw root, and the second screw thread The thread pitch in area is less than the thread pitch of the first threaded area.

2. bone screw according to claim 1, it is characterised in that：The thread rotary orientation and second of first threaded area The thread rotary orientation of threaded area is identical.