CN2309804Y

CN2309804Y - U-shape nail with self-fastening function

Info

Publication number: CN2309804Y
Application number: CN 97250235
Authority: CN
Inventors: 达国祖
Original assignee: LANZHOU MEMORY ALLOY CO Ltd
Current assignee: LANZHOU MEMORY ALLOY CO Ltd
Priority date: 1997-11-21
Filing date: 1997-11-21
Publication date: 1999-03-10
Anticipated expiration: 2007-11-21

Abstract

The utility model discloses a U-shaped nail, which is used for connecting fracture and is made of nickel titanium-shaped memory alloy. Two fixing positions which form straight line segments and a connecting segment which is used for the connection of the two fixing positions and is star-shaped are arranged on the U-shaped nail, wherein, a curved segment is arranged on the Connecting segment. A nonvanishing angle can exists between the plane surface on which the curved segment of the utility model is positioned and the plane surface which is formed by the fixing positions which form straight line segments. When the utility model is used, the curved segment is kept under the condition of low temperature and is deformed. In other words, the curved segment is pulled apart and is implanted in a patient's fracture position. After the U-shaped nail is arranged in the patient's body, the U-shaped nail starts recovering the original shape under the action of the body temperature to lead the curved segment which is positioned on the connecting segment to recover to the original shape. Simultaneously, larger additional tightening force can be generated.

Description

Has pressed nail from fastening function

This utility model relates to-apparatus that kind of surgery is used, more definite is the pressed nail that a kind of orthopaedics is used to connect knochenbruch, and this pressed nail is to make with niti-shaped memorial alloy, two the linearly fixed positions and the connecting section formation that connects two fixed positions of section are arranged on it, and whole pressed nail is ∏ shape.

Because the performance of its original shape of recovery that niti-shaped memorial alloy is special makes it that application more widely medically arranged.Adopt the existing many reports of blade plate that niti-shaped memorial alloy becomes or pressed nail, disclose multiple this class apparatus in the Chinese utility model patent, for example, 88217808.3,93217742.5,93217742.3, and 91232887.8 etc.Common deficiency is that it is not enough from fastening force in disclosed these apparatuses, and the apparatus relative volume is big.Because from the fastening force deficiency, existing apparatus can't be avoided moving of fracture site taken place in patient's generation activity in clinical use, this is disadvantageous to patient's union of fracture.Because volume is relatively large, it is greatly uncomfortable that existing apparatus is used for when repair at the less position of top layer muscle such as skull, denomination bone, patella the patient being produced.

The purpose of this utility model provides a kind of prior art deficiency that overcomes, and has bigger lessly from fastening function, volume, more is applicable to the pressed nail at the less positions of muscle, top layer such as repairing skull, denomination bone, patella.

The purpose of this utility model realizes by following measure:

With niti-shaped memorial alloy make two linearly section fixed position and connect the pressed nail of the connecting section of two fixed positions, whole pressed nail is ∏ shape, has one section curved section at described connecting section.This utility model makes the redeformation at low temperatures of this curved section in use earlier, being about to curved section draws back, again it is implanted patient's fracture site, after in it inserts patient's body under patient's body temperature effect pressed nail begin to recover its original shape, make the curved section that is in connecting section return to original shape, produce bigger additional fastening force simultaneously.

Curve on the described connecting section of the present utility model can be corrugated, the most simply is that curved section on the connecting section is the curved section of one section projection that is symmetrical in the axis of symmetry of pressed nail.

This utility model can also be the curved section place on the connecting section the plane with two linearly one on the plane that fixed position the became folder of section be not equal to zero angle, preferably the folded angle in the plane at the curved section place on the connecting section and two planes that fixed position became linearly section is 90 °.Adopt this structure can make the curved section of connecting section of pressed nail parallel with the affected muscles top layer, it is bigger from fastening force that it can be produced, can avoid again making it protruding upward along fracture site because of the influence of pressed nail upper curve section, muscle and skin jack-up with the position, affected part, cause subject discomfort, make it be more suitable for repairing in the less position of top layer muscle such as skull, denomination bone, patella.Curved section among this embodiment of the present utility model on the connecting section is preferably the curved section of one section projection of the axis of symmetry of the connecting section that is symmetrical in pressed nail.

Description of drawings

Fig. 1 is the front view of a kind of embodiment of the present utility model

Fig. 2 is the vertical view of Fig. 1

Fig. 3 is the left view of Fig. 1

Fig. 4 is the schematic perspective view of another kind of embodiment of the present utility model

Fig. 5 is the front view of embodiment shown in Figure 4

Fig. 6 is the vertical view of Fig. 5

Fig. 7 is the left view of Fig. 5

Fig. 8 is the sketch map of the preceding Patella fracture of operation

Fig. 9 is the fixing sketch map of fracture site of used after operation this utility model

Be to make with niti-shaped memorial alloy to have two linearly fixed position (1) and (2) of section in the embodiment that Fig. 1 provides, and connecting section (3) formation that connects two fixed positions (1) and (2).As seen from Figure 1, one section curved section (4) that is symmetrical in one section projection of pressed nail axis of symmetry is arranged in the connecting section (3).Angle α between two fixed positions (1) and (2) and connecting section (3), consistent with prior art is generally 40～70 °.The pressed nail that present embodiment provides is earlier it to be carried out disinfection in actual applications, be placed on then in 0～4 ℃ the frozen water, with pliers with fixed position (1) and (2) strut with connecting section be suitable angle °, and the curved section (4) of projection stretched reach the appropriate location, respectively bore a hole in fracture both sides, slit, and two fixed positions (1) (2) of pressed nail are inserted in the hole, Ultimum Ti undergoes phase transition when the temperature of pressed nail rises to the blood heat by 0～4 ℃, and return to original shape, be that the α angle returns to 40～70 °, fracture is produced certain thrust, and the curved section of the projection through drawing back (4) also produces retraction, produce in the prior art unexistent, additional to fracture, lasting and strong thrust, and reach the purpose that promotes the fracture healing.

The given embodiment of Fig. 4 makes one with niti-shaped memorial alloy to have two the linearly fixed position (5) (6) of section and the connecting sections (7) of connection two fixed positions, the pressed nail that is ∏ shape, angle α between two fixed positions (5) and (6) and connecting section (7), consistent with prior art also is 40～70 °.Curved section (8) on connecting section (7), wherein linearly the folded angle beta in the plane that become with (6) of fixed position (5) of section is non-vanishing with two on the plane at curved section (8) place, β is 90 ° in the present embodiment, and its concrete shape can be referring to Fig. 5, Fig. 6 and Fig. 7.The curved section of present embodiment (8) is for one section fillet curve section of axis of symmetry of the connecting section (7) that is symmetrical in pressed nail, referring to Fig. 6.The use of present embodiment and effect thereof are identical with previous embodiment, but because the plane at curved section (8) place of present embodiment is vertical mutually with the plane at (6) place with two fixed positions (5), this curved section that can overcome among the last embodiment outwards protrudes along fracture, and with the muscle of fracture and the deficiency of skin jack-up.Obviously, present embodiment is more suitable for being used to repair the less positions of top layer muscle such as skull, denomination bone, patella.

Practical application of the present utility model can be referring to Fig. 8 and the given signal of Fig. 9.

Claims

1 ,-kind be used for fixedly fracture site of surgery, the pressed nail made from niti-shaped memorial alloy, linearly the fixed position of section and the connecting section that connects two fixed positions constitute described pressed nail by two, whole pressed nail is ∏ shape, it is characterized in that described connecting section has one section curved section.

2, pressed nail according to claim 1 is characterized in that the curved section on the described connecting section is a waveform.

3, pressed nail according to claim 2 is characterized in that the curved section on the described connecting section is the one section fillet curve section that is symmetrical in the pressed nail axis of symmetry.

4, pressed nail according to claim 1, the plane that it is characterized in that the curved section place on the described connecting section with two linearly one on the plane that fixed position the became folder of section be not equal to zero angle.

5, pressed nail according to claim 4, the plane that it is characterized in that the curved section place on the described connecting section with two linearly the folded angle in the plane that fixed position became of section be 90 °.

6, pressed nail according to claim 5, it is characterized in that curved section on the described connecting section be symmetrical in pressed nail connecting section axis of symmetry-section fillet curve section.