CN108095816B - Square halberd screw - Google Patents

Abstract

The invention discloses a square halberd screw; comprises a screw main body and a fixed needle; the screw main body is provided with an inner hole along the axis; the tail part of the screw main body is provided with an inclined hole along the axial direction; the inclined hole is communicated with the inner hole; the inner hole is provided with a fixed needle matched with the inner hole. According to the square-root screw provided by the invention, the screw anti-backing effect can be achieved by installing the fixing needle into the screw main body and directly screwing in without fixing the screw cap, or the dual fixing needle is installed into the screw main body and screwing the screw cap tightly, so that the dual fixing screw anti-backing effect can be achieved; the screw is used for preventing the risk of fixing the backward nail for the patient with the osteoporosis fracture, and improving the bone healing rate of the patient with the osteoporosis fracture.

Description

Square halberd screw

Technical Field

The invention relates to the technical field of medical devices, in particular to a halberd screw.

Background technique

When screws are used alone, they can fix fractures by virtue of the close engagement of the screw threads with the bone. However, as the axial dynamic load cycle increases, the screws begin to loosen. If screw loosening occurs before the fracture heals, the fracture ends will become unstable, causing delayed fracture healing or fracture healing failure. This is especially true for patients with osteoporosis who are at greater risk of screw withdrawal.

When screws are used in conjunction with plates, the screws loosen due to the increased axial dynamic load cycle. If screw loosening occurs before the fracture heals, the fracture ends will not be stable, especially the epiphyseal ends and osteoporotic bone ends, which will make it more difficult to maintain the stability of the fracture ends.

Summary of the invention

The purpose of the invention is to provide a halberd screw; the screw avoids the phenomenon of screw withdrawal during use of traditional screws, so that fracture healing is faster and more stable.

The objective of the present invention is achieved through the following technical solutions:

The halberd screw provided by the present invention comprises a screw body and a fixing pin; the screw body is provided with an inner hole along the axis; the tail of the screw body is provided with an oblique hole along the axial direction; the oblique hole is communicated with the inner hole; the inner hole is provided with a fixing pin matching the inner hole.

Furthermore, the screw body is a screw-shaped column.

Furthermore, the inclined hole is symmetrically arranged at the tail of the screw body; the axial angle of the inclined hole is 20 degrees to 25 degrees; and the axial angle is the angle between the axial direction of the body and the axis of the inclined hole.

Furthermore, the fixing needle is a single fixing needle, the head of the single fixing needle is provided with a thread, and the tail is provided with a triangular pyramid.

Furthermore, the fixing needle is a double fixing needle, the head of the double fixing needle is provided with an internal thread; and the tail is provided with two triangular pyramids.

Furthermore, the head of the screw body is configured as a tapered thread, and the end face of the tapered thread is a hexagonal or plum blossom-shaped hole.

Furthermore, three local small incisions of the same size and evenly distributed are arranged at the tail of the screw body.

Furthermore, a nut is provided at the head of the screw body; the nut is provided with an external thread, and the end face of the nut is a hexagonal or plum blossom-shaped hole.

Due to the adoption of the above technical solution, the present invention has the following advantages:

The halberd screw provided by the present invention includes a screw, a fixing pin and a nut; the screw is provided with an inner hole, and two oblique holes are made at 180 degrees in the axial direction at the tail of the screw body, the oblique holes are connected to the inner hole of the screw axis, the angle of the oblique holes is 20 degrees to 25 degrees at the axial angle, and the inner hole of the head of the screw body is provided with a fixing thread. There are two types of fixing pins, one is a single fixing pin with a thread on the head and a triangular pyramid on the tail. The other is a double fixing pin, the head is provided with an internal thread to match a special instrument. There are two fixing pins with triangular pyramids at the tail. The present invention can achieve the effect of preventing the screw from retreating by directly screwing in the single fixing pin into the screw without fixing it with a nut. The double fixing pin requires a special instrument to be installed in the screw and the nut is tightened to achieve the effect of double fixing screw retreat. The halberd screw avoids the risk of fixing the screw backward for patients with osteoporotic fractures, and improves the bone healing rate of patients with osteoporotic fractures.

Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings of the present invention are as follows.

Figure 1 is a front view of the halberd screw.

Figure 2 is a rear view of the halberd screw.

Figure 3 is a view of the halberd screw in the direction of A.

FIG. 4 is a view of the halberd screw in the direction of B. FIG.

In the figure: 1 is the screw body, 2 is the fixing pin (single fixing pin or double fixing pin), and 3 is the nut.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Example 1

As shown in the figure, the halberd screw provided in this embodiment includes a screw body and a fixing pin; the screw body is provided with an inner hole along the axis; the tail of the screw body is provided with an inclined hole along the axial direction; the inclined hole is communicated with the inner hole; the inner hole is provided with a fixing pin matching the inner hole.

The screw body is a screw-shaped column.

The inclined hole is symmetrically arranged at the tail of the screw body; the axial angle of the inclined hole is 20 degrees to 25 degrees; the axial angle is the angle between the axial direction of the body and the axis of the inclined hole.

The fixing needle is a single fixing needle, the head of the single fixing needle is provided with a thread, and the tail is provided with a triangular pyramid.

The fixing needle is a double fixing needle, the head of the double fixing needle is provided with an internal thread, and the tail is provided with two triangular pyramids.

The head of the screw body is arranged as a tapered thread, and the end face of the tapered thread is a hexagonal or plum blossom-shaped hole.

The tail of the screw body is provided with three local small incisions of the same size and evenly distributed.

The head of the screw body is provided with a nut; the nut is provided with an external thread, and the end face of the nut is a hexagonal or plum blossom-shaped hole.

Example 2

As shown in the figure, the halberd screw provided in this embodiment can achieve the effect of preventing the screw from retreating by inserting a single fixing pin into the screw body without fixing the nut. The double fixing pin requires a special instrument to be inserted into the screw body and the nut is tightened to achieve the effect of double fixing screw retreat. The halberd screw avoids the risk of screw retreat for patients with osteoporotic fractures and improves the bone healing rate of patients with osteoporotic fractures.

The halberd screw provided in this embodiment includes a screw body 1, a fixing pin 2 and a nut 3; the screw body is provided with an inner hole, and two oblique holes are made at the tail of the screw body at an axial angle of 180 degrees respectively, the oblique holes are connected to the inner hole of the axis of the screw body, and the angle of the oblique holes is 20 to 25 degrees at an axial angle, and a fixing thread is provided in the inner hole of the head of the screw body. There are two types of fixing pins, one is a single fixing pin with a thread on the head and a triangular pyramid at the tail. The other is a double fixing pin with an internal thread on the head to match a special instrument. There are two fixing pins with triangular pyramids at the tail. The upper and lower parts of the tail opened in Figure 1 are two fixing pins, and the fixing pins are divided into single pins and double pins. Figure 1 is a double pin fixing pin.

The head of the screw body is set with a tapered thread, and its end face is set with a hexagonal or plum blossom hole. Three uniformly distributed 90-degree local small incisions are set at the tail of the screw body. The structure of the fixing pin is divided into two structures: a single fixing pin and a double fixing pin. The head of the single fixing pin is provided with a threaded end face set with a hexagonal or plum blossom hole, and the tail is set as a triangular pyramid. The head of the double fixing pin is provided with an internal thread, and the tail is set as a triangular pyramid. The external thread of the nut is set with a 60-degree thread, and its end face is set with a hexagonal or plum blossom hole; to facilitate better torque transmission.

The screw provided in this embodiment can be installed into the screw body through a single fixing pin and can be directly screwed in without a nut to achieve the effect of preventing the screw from retreating. The halberd screw is made of titanium alloy or cobalt-chromium-molybdenum alloy or left-handed polylactide material with good biocompatibility and corrosion resistance to ensure the system mechanical stability of the halberd screw.

In order to achieve the purpose of self-checking the halberd screw to prevent retreat, a pressure sensor is arranged between the fixing needle and the screw body in the halberd screw, which is used to sense the pressure between the fixing needle and the screw body. A signal processing mechanism is arranged at the other end of the pressure sensor. The signal processing mechanism is connected to the pressure sensor and is used to receive the signal transmitted by the pressure sensor, so as to detect whether the halberd screw is in a loose state.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the protection scope of the present invention.

Claims (8)

1. A halberd screw, characterized in that: it comprises a screw body and a fixing pin; the screw body is provided with an inner hole along the axis; the tail of the screw body is provided with an oblique hole along the axial direction; the oblique hole is communicated with the inner hole; the inner hole is provided with a fixing pin matching the inner hole; A pressure sensor is arranged between the fixing needle and the screw body in the halberd screw, which is used to sense the pressure between the fixing needle and the screw body. A signal processing mechanism is arranged at the other end of the pressure sensor. The signal processing mechanism is connected to the pressure sensor and is used to receive the signal transmitted by the pressure sensor, so as to detect whether the halberd screw is in a loose state. 2. The halberd screw as described in claim 1 is characterized in that: the screw body is a screw-shaped column. 3. The halberd screw as described in claim 1 is characterized in that: the inclined hole is symmetrically arranged at the tail of the screw body; the axial angle of the inclined hole is 20 degrees to 25 degrees; the axial angle is the angle between the axial direction of the body and the axis of the inclined hole. 4. The halberd screw according to claim 1 is characterized in that: the fixing pin is a single fixing pin, the head of the single fixing pin is provided with a thread, and the tail is provided with a triangular pyramid. 5. The halberd screw according to claim 1 is characterized in that: the fixing pin is a double fixing pin, the head of the double fixing pin is provided with an internal thread; and the tail is provided with two triangular pyramids. 6. The halberd screw according to claim 1 is characterized in that the head of the screw body is arranged as a tapered thread, and the end face of the tapered thread is a hexagonal or plum blossom-shaped hole. 7. The halberd screw as described in claim 1 is characterized in that three local small incisions of the same size and evenly distributed are set at the tail of the screw body. 8. The halberd screw as described in claim 1 is characterized in that: a nut is provided at the head of the screw body; the nut is provided with an external thread, and the end face of the nut is a hexagonal or plum blossom-shaped hole.