CN212879542U

CN212879542U - Disposable expansion type screw extractor

Info

Publication number: CN212879542U
Application number: CN202020665948.XU
Authority: CN
Inventors: 刘军; 芮永军; 吴永伟
Original assignee: Wuxi No 9 Peoples Hospital
Current assignee: Wuxi No 9 Peoples Hospital
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2021-04-06
Anticipated expiration: 2030-04-27

Abstract

The utility model discloses a smooth silk screw extractor of disposable inflation formula, including the screwdriver head, connecting rod and handle, the periphery of screwdriver head is the hexagonal star type, the screwdriver head has axial through-hole, the latter half of screwdriver head is equipped with the axial breach of a plurality of, the connecting rod includes the body of rod and locates the joint portion of body of rod lower extreme, joint portion be with through-hole assorted rugby shape, the cross sectional shape of joint portion suits with the cross sectional shape of through-hole, the cross sectional dimension of joint portion reduces gradually after from top to bottom crescent again, the maximum cross sectional dimension of joint portion is greater than the cross sectional dimension of the interior hexagonal recess of screw, the upper end and the handle of the body of rod can be dismantled and be connected. The utility model discloses a split type structure, simple structure, it is easy and simple to handle, do not destroy the sclerotin, no metallic debris remains, is difficult for smooth silk once more, is showing and shortens the operation time, reduces the infection probability, has high success rate, and screwdriver head and connecting rod make things convenient for industrialization batch production for disposable product.

Description

Disposable expansion type screw extractor

Technical Field

The utility model belongs to the technical field of medical instrument, especially, relate to a smooth silk screw extractor of disposable inflation formula.

Background

The most common way of fixing fractures in the clinic today is internal fixation, of which locking bone plates and screw fixation have become the mainstream. Due to the difference of national conditions, after fracture healing, the patients who need to be fixed and taken out in rows still account for the majority of the patients. In the process of taking out the locking bone fracture plate and the screw device, the self-tapping type inner hexagonal locking screw is found to be easy to slip, so that the operation time is prolonged, the infection probability is increased, the locking bone fracture plate and the screw device are difficult to take out, even cannot be taken out, and serious complications such as re-fracture are possibly caused. This is particularly the case for patients with long screws in the diaphyseal region. The clinical consideration of the screw sliding is mainly as follows: the tail of the locking screw is subjected to cold welding, and the friction force between the screw and the bone plate is increased to cause the sliding wire during screwing; the head of the locking screw is a self-tapping head, a gap exists, bone grows into the gap in the fracture healing process, and the screw slides due to the fact that the head of the locking screw grows into the bone block in the screwing process; the matched screwdriver is deformed due to long use time or frequent use, and the screw is directly screwed to slide. At present, the commonly used quincunx screwdriver and the taper reverse thread tapping can not be effectively clamped in the groove of the sliding thread hexagon socket screw, and the failure rate is high.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a disposable inflation formula smooth silk screw extractor.

The utility model provides a smooth silk screw extractor of disposable inflation formula, includes screwdriver head, connecting rod and handle, the periphery of screwdriver head is the hexagonal star type, the screwdriver head has axial through-hole, the latter half of screwdriver head is equipped with the axial breach of a plurality of, the connecting rod includes the body of rod and locates the joint portion of the body of rod lower extreme, joint portion be with through-hole assorted rugby shape, the cross sectional shape of joint portion with the cross sectional shape of through-hole suits, the cross sectional dimension of joint portion reduces gradually after from top to bottom gradually increasing again, the maximum department of joint portion cross sectional dimension is greater than the cross sectional dimension of the interior hexagonal recess of screw, the upper end of the body of rod with the connection can be dismantled to the handle.

Above technical scheme is preferred, the through-hole is hexagon socket, the corresponding hexagonal rugby shape that is of joint portion, the cross section of joint portion is the hexagon.

Above technical scheme is preferred, the breach respectively by the bottom middle part of six sides of screwdriver head upwards extends to the middle part of screwdriver head.

Above technical scheme is preferred, the length of joint portion is unanimous with the length of screwdriver head.

Above technical scheme is preferred, hard alloy material is all selected for use to screwdriver head and connecting rod.

Above technical scheme is preferred, the screwdriver head and connecting rod all select tungsten steel or gold steel for use.

Above technical scheme is preferred, the through-hole is the shoulder hole, the shoulder hole includes the macropore of upper end and the aperture of lower extreme, the aperture with the breach corresponds the setting.

Above technical scheme is preferred, the handle is T type handle, the lower extreme of handle is equipped with the joint hole, the upper end of the body of rod is equipped with the joint post, the handle with joint post joint.

Above technical scheme is preferred, the diameter of the body of rod is greater than the diameter of the tail cap of screw.

The utility model has the advantages and positive effects that: the utility model provides a disposable expansion type extractor for a slide screw, which is characterized in that the lower part of a screwdriver head is in an expansion type by arranging a notch, the lower half part of the screwdriver head is expanded by inserting a connecting rod, the screwdriver head is tightly clamped with an inner hexagonal groove of a screw, and the screw of the slide screw can be smoothly screwed out by connecting a handle with the connecting rod; the utility model discloses a split type structure, simple structure, it is easy and simple to handle, do not destroy the sclerotin, no metallic debris remains, is difficult for smooth silk once more, is showing and shortens the operation time, reduces the infection probability, has high success rate, and screwdriver head and connecting rod make things convenient for industrialization batch production for disposable product.

Drawings

Fig. 1 is a schematic cross-sectional view of a screwdriver head according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a screwdriver head according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a connecting rod according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a T-shaped handle according to an embodiment of the present invention.

Wherein: 1. a screwdriver head; 2. a connecting rod; 3. a handle; 4. a through hole; 5. a notch; 6. a rod body; 7. a clamping part; 8. the clamping column.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment provides a disposable expansion type sliding screw extractor, as shown in fig. 1-4, which comprises a screwdriver head 1, a connecting rod 2 and a handle 3, wherein the periphery of the screwdriver head 1 is in a hexagonal star shape, the diameter of the hexagonal star shape is matched with the diameter of an inner hexagonal groove of a screw, the screwdriver head 1 is provided with an axial through hole 4, the lower half part of the screwdriver head 1 is provided with a plurality of axial notches 5, and the notches 5 are arranged so that the lower half part of the screwdriver head 1 can expand outwards when being subjected to a radially outward force; the connecting rod 2 comprises a rod body 6 and a clamping part 7 arranged at the lower end of the rod body 6, the clamping part 7 is in a football shape matched with the through hole 4, the cross section shape of the clamping part 7 is matched with the cross section shape of the through hole 4, the cross section size of the clamping part 7 is gradually increased from top to bottom and then gradually reduced, the maximum cross section size of the clamping part 7 is larger than the cross section size of an inner hexagonal groove of the screw, and particularly, the maximum cross section size of the clamping part 7 is slightly larger than the cross section size of the inner hexagonal groove of the screw, so that the clamping part 7 extends into the through hole 4 to have radial outward pressure on the through hole 4, the screwdriver head 1 around the gap 5 is expanded, and the periphery of the screwdriver head 1 is clamped with the inner hexagonal groove; the olive-shaped middle part of the clamping part 7 is slightly thicker and thinner, so that the connecting rod 2 can be conveniently knocked into the through hole 4 of the screwdriver head 1, the maximum cross section of the clamping part 7 is slightly larger than the cross section of the inner hexagonal groove of the screw, and the screwdriver head 1 can be expanded and clamped with the screw to be taken out after being knocked in; the upper end of the rod body 6 and the handle 3 can be detachably connected, so that the handle 3 can be repeatedly utilized, and the screwdriver head 1 and the connecting rod 2 are disposable products.

During the use, put into the interior hexagonal recess of the screw behind the smooth silk with screwdriver head 1, with joint portion 7 of connecting rod 2 by the through-hole 4 embedding of screwdriver head 1 in, because the biggest department of joint portion 7 cross section size slightly is greater than the cross section size of the interior hexagonal recess of screw, make screwdriver head 1 the latter half outwards expand the inflation, make the interior hexagonal recess of screw fully blocked in screwdriver head 1 periphery after the inflation, make handle 3 exert the pivoted power through connecting rod 2 again and screw out interior set screw.

Specifically, through-hole 4 is hexagon socket head, joint portion 7 is corresponding to be hexagonal football shape, joint portion 7's cross section is the hexagon, joint portion 7's cross sectional dimension is hexagonal from top to bottom gradually reduced after the size of hexagon gradually increases promptly, and cross sectional dimension is that the biggest department of size of hexagon is greater than the cross sectional dimension of the hexagon socket head cap groove of screw. Alternatively, the cross-sectional shape of the through hole 4 may be a triangle or a quadrangle, and the cross-sectional shape of the clamping portion 7 is adapted to the cross-sectional shape of the through hole 4.

Optionally, breach 5 respectively by the bottom middle part of six sides of screwdriver head 1 upwards extends to screwdriver head 1's middle part makes the six sides homoenergetic of screwdriver head 1 the latter half expand, makes the interior hexagonal recess chucking position of screwdriver head 1 and screw distribute evenly, can improve screwdriver head 1 and interior hexagonal recess connection's stability. The notch 5 can be obtained by sawing the lower half of the center of six side surfaces of the screwdriver head 1.

Optionally, the length of the clamping portion 7 is the same as that of the screwdriver head 1. The screwdriver head 1 and the connecting rod 2 are made of hard alloy materials. Preferably, the screwdriver head 1 and the connecting rod 2 are made of tungsten steel or gold steel.

Optionally, the through hole 4 is a stepped hole, the stepped hole includes a large hole at an upper end and a small hole at a lower end, and the small hole is arranged corresponding to the notch 5. By means of a stepped hole, the part corresponding to the gap 5 can be set to a smaller diameter than the upper opening, so that the screwdriver head 1 can be fully expanded and clamped with the connecting rod 2 in operation.

Specifically, handle 3 is T type handle 3, the lower extreme of handle 3 is equipped with the joint hole, the upper end of the body of rod 6 is equipped with joint post 8, handle 3 with 8 joints of joint post. The cross section of joint hole and joint post 8 can be triangle-shaped, quadrangle or hexagon etc. and this embodiment is triangle-shaped.

Optionally, the diameter of the shank 6 is greater than the diameter of the tail cap of the screw.

The working process of the embodiment: when the screwdriver is used, the screwdriver head 1 is firstly placed in the inner hexagonal groove of the slide screw, then the clamping part of the connecting rod 2 is knocked and embedded into the inner hexagonal through hole 4 of the screwdriver head 1, the lower half part of the screwdriver head 1 is gradually expanded, six side surfaces of the screwdriver head 1 are tightly clamped into the inner hexagonal groove of the screw, the maximum cross section size of the clamping part 7 is slightly larger than that of the inner hexagonal groove of the screw, and the screwdriver head 1 can be effectively prevented from popping out of the inner hexagonal groove of the screw during knocking; and finally, the upper end of the connecting rod 2 is connected with the T-shaped handle 3 to screw out the slide screw.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. The utility model provides a smooth silk screw extractor of disposable inflation formula which characterized in that: including screwdriver head, connecting rod and handle, the periphery of screwdriver head is the hexagonal star type, the screwdriver head has axial through-hole, the latter half of screwdriver head is equipped with the axial breach of a plurality of, the connecting rod includes the body of rod and locates the joint portion of body of rod lower extreme, joint portion be with through-hole assorted rugby ball, the cross sectional shape of joint portion with the cross sectional shape of through-hole suits, the cross sectional dimension of joint portion reduces gradually after from top to bottom crescent again, the maximum department of joint portion cross sectional dimension is greater than the cross sectional dimension of the interior hexagonal recess of screw, the upper end of the body of rod with the connection can be dismantled to the handle.

2. The disposable expansion-type slide screw extractor of claim 1, wherein: the through-hole is hexagon socket, the joint portion is corresponding six face type rugby shape, the cross section of joint portion is the hexagon.

3. The disposable expansion-type slide screw extractor of claim 1, wherein: the gap extends upwards to the middle part of the screwdriver head from the middle parts of the bottom ends of the six side surfaces of the screwdriver head respectively.

4. The disposable expansion-type slide screw extractor of claim 1, wherein: the length of the clamping portion is consistent with that of the screwdriver head.

5. The disposable expansion-type slide screw extractor of claim 1, wherein: the screwdriver head and the connecting rod are made of hard alloy materials.

6. The disposable expanding slide screw extractor of claim 5, wherein: the screwdriver head and the connecting rod are made of tungsten steel or gold steel.

7. The disposable expansion-type slide screw extractor of claim 2, wherein: the through hole is a stepped hole which comprises a large hole at the upper end and a small hole at the lower end, and the small hole is arranged corresponding to the notch.

8. The disposable expansion-type slide screw extractor of claim 1, wherein: the handle is T type handle, the lower extreme of handle is equipped with the joint hole, the upper end of the body of rod is equipped with the joint post, the handle with joint post joint.

9. The disposable expansion-type slide screw extractor of claim 1, wherein: the diameter of the rod body is larger than that of the tail cap of the screw.