CN213665684U - Internal fixation screw extraction system - Google Patents

Abstract

The utility model discloses an internal fixation screw taking-out system, which belongs to the technical field of medical instruments and comprises an inner shaft and a shaft sleeve assembly sleeved on the inner shaft, wherein one end of the inner shaft is fixedly connected with a limit sleeve, the other end of the inner shaft is movably connected with a screwdriver head, the inner shaft is fixedly connected with a first embedded part, the shaft sleeve assembly comprises an inner shaft sleeve sleeved between the limit sleeve and the first embedded part, one end of the inner shaft sleeve is provided with a second embedded part matched with the first embedded part, the inner diameter of the inner shaft sleeve is smaller than the outer diameter of the limit sleeve, an outer shaft sleeve is sleeved outside the inner shaft sleeve, a fastening device is arranged between the inner shaft sleeve and the outer shaft sleeve, the outer shaft sleeve extends and is closed along the direction of the limit sleeve, an elastic element is arranged between the outer shaft sleeve and the limit sleeve, when the outer shaft sleeve slides to the first embedded part, the second embedded part of the inner shaft sleeve guides the, thereby drive criticize first synchronous revolution, the utility model discloses can effectively take out the steel sheet screw, have stable efficient advantage.

Description

Internal fixation screw extraction system

Technical Field

The utility model relates to the technical field of medical equipment, specifically be interior set screw system of taking out.

Background

The steel plate screws are used for fixing the fracture in the trauma orthopedics department, most of the steel plate screws need to be taken out after the fracture is healed, screw sliding buckles are generated in the taking-out process, particularly in recent years, the titanium alloy steel plate and the titanium alloy screws are common, and the problem that orthopedics doctors are very troublesome is solved. The situation of screw sliding is appeared, the current common method is to deepen the tail cap of the screw by a tungsten steel drill, connect the tail cap of the screw on a T handle or an electric drill by a conical reverse-thread drill, force the screw to be longitudinally extruded, and reversely rotate the screw, so that the conical reverse-thread drill and the screw are locked, sometimes the screw is successfully taken out, sometimes the lock cannot be locked, and even sometimes the reverse-thread drill is suddenly broken after the lock is suddenly locked. Therefore, there is a high necessity for a remover that can effectively remove the steel plate screws.

Based on this, the utility model designs an internal fixation screw takes out system to solve above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an internal fixation screw takes out system to solve above-mentioned technical problem.

In order to achieve the above object, the utility model provides a following technical scheme: the internal fixing screw taking-out system comprises an inner shaft and a shaft sleeve assembly sleeved on the inner shaft, wherein one end of the inner shaft is fixedly connected with a limiting sleeve, the other end of the inner shaft is movably connected with a screwdriver head used for loosening screws, one end of the inner shaft close to the screwdriver head is fixedly connected with a first embedded part, the shaft sleeve assembly comprises an inner layer shaft sleeve sleeved between the limiting sleeve and the first embedded part, one end of the inner layer shaft sleeve is provided with a second embedded part used for being matched with the first embedded part, the inner diameter of the inner layer shaft sleeve is smaller than the outer diameter of the limiting sleeve, the outer layer shaft sleeve is sleeved outside the inner layer shaft sleeve, a fastening device is arranged between the inner layer shaft sleeve and the outer layer shaft sleeve, the outer layer shaft sleeve extends and closes towards the direction of the limit sleeve, an elastic element is arranged between the outer layer shaft sleeve and the limit sleeve, when the outer layer shaft sleeve slides to the first embedding part, the second embedding part of the inner layer shaft sleeve guides the first embedding part to rotate in the circumferential direction, so that the screwdriver head is driven to rotate synchronously.

Preferably, the first engaging portion is annular, and an opening is symmetrically formed at one end of the first engaging portion close to the second engaging portion, and a cross section of the opening is gradually reduced along a direction away from the second engaging portion.

Preferably, one end of the opening profile is arranged in parallel along the axis direction of the first embedding part, the other end of the opening profile is arc-shaped, and the arc-shaped opening faces the second embedding part.

Preferably, a plurality of threaded holes are formed in the circumferential direction of the inner-layer shaft sleeve along the length direction of the inner-layer shaft sleeve, through holes are formed in the positions, corresponding to the threaded holes, of the outer-layer shaft sleeve in a penetrating mode, fastening screws penetrate through the threaded holes, and the threaded holes and the fastening screws are matched to form the fastening device.

Preferably, the outer wall of the outer layer shaft sleeve is provided with a counter bore at the position of the through hole, and an arc-shaped gasket is arranged between the head of the screw and the counter bore.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses interior axle and with interior axle complex axle sleeve subassembly have, interior axle has the stop collar, first gomphosis portion and swing joint's criticize head, the axle sleeve subassembly have locate first gomphosis portion and the outer axle sleeve of the inlayer axle sleeve rigid coupling between with the stop collar, when being used for unclamping steel sheet screw, hold outer axle sleeve on the other hand, let criticize the head and aim at steel sheet screw, only need strike outer axle sleeve during the use and keep away from the one end of criticizing the head, can make outer axle sleeve slide to the direction that is close to steel sheet screw, and then drive the inlayer axle sleeve and slide, it is rotatory to make the first gomphosis portion of second gomphosis portion guide of inlayer axle sleeve, and then synchronous drive interior rotation of axle, in order to reach the effect of unclamping steel sheet screw, and outer axle sleeve and stop collar are equipped with elastic element, can directly reset when having.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a schematic view showing a first engaging portion of the present embodiment.

In the drawings, the components represented by the respective reference numerals are listed below:

1. an inner shaft; 11. a limiting sleeve; 12. a batch head; 13. a first fitting portion; 131. an opening; 2. a bushing assembly; 21. an inner layer shaft sleeve; 211. a second fitting portion; 22. an outer layer shaft sleeve; 221. a counter bore; 23. a fastening device; 231. a threaded hole; 232. fastening screws; 24. an elastic element.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: an internal fixed screw taking-out system comprises an inner shaft 1 and a shaft sleeve assembly 2 sleeved on the inner shaft 1, wherein one end of the inner shaft 1 is fixedly connected with a limiting sleeve 11, the other end of the inner shaft 1 is movably connected with a screwdriver head 12 used for loosening screws, one end of the inner shaft 1 close to the screwdriver head 12 is fixedly connected with a first embedding part 13, the shaft sleeve assembly 2 comprises an inner layer shaft sleeve 21 sleeved between the limiting sleeve 11 and the first embedding part 13, one end of the inner layer shaft sleeve 21 is provided with a second embedding part 211 used for being matched with the first embedding part 13, the inner diameter of the inner layer shaft sleeve 21 is smaller than the outer diameter of the limiting sleeve 11, an outer layer shaft sleeve 22 is sleeved outside the inner layer shaft sleeve 21, a fastening device 23 is arranged between the inner layer shaft sleeve 21 and the outer layer shaft sleeve 22, the outer layer shaft sleeve 22 extends and is closed towards the direction of the limiting sleeve 11, an elastic element 24 is arranged between the outer layer shaft sleeve 22 and the limiting sleeve 11, when the outer layer shaft sleeve 22 slides towards, thereby causing the batch head 12 to rotate synchronously.

As shown in fig. 1, the inner sleeve 21 has a plurality of threaded holes 231 along its length direction in the circumferential direction, the outer sleeve 22 has a through hole corresponding to the threaded hole 231, a fastening screw 232 is inserted into the threaded hole 231, the threaded hole 231 and the fastening screw 232 cooperate to form the fastening device 23, the inner and outer layers are fastened in a threaded manner, and can be disassembled according to actual conditions to replace internal wear parts, such as the elastic element 24, which has the advantage of convenient assembly and disassembly.

As shown in fig. 1, the outer wall of the outer shaft sleeve 22 is provided with a counter bore 221 at the position of the through hole, an arc gasket is arranged between the head of the screw and the counter bore 221, a fastening screw 232 is fastened and embedded in the outer shaft sleeve 22, so that the influence of the protrusion of the fastening screw on the holding of the extractor by a user can be reduced, one end of the arc gasket is an arc end, the other end of the arc gasket is a plane end, the fastening screw 232 presses the plane end to enable the arc end to be attached to the outer shaft sleeve 22, and the inner shaft sleeve 21 and the outer shaft sleeve.

As shown in fig. 1 and 2, the first engaging portion 13 is annular, and an opening 131 is symmetrically formed at one end of the first engaging portion 13 close to the second engaging portion 211, a cross section of the opening 131 is gradually reduced in a direction away from the second engaging portion 211, and the larger opening 131 faces the second engaging portion 211, so that when the second engaging portion 211 moves towards the first engaging portion 13, a guiding function is performed.

As shown in fig. 1 and 2, one end of the contour of the opening 131 is parallel to the axial center direction of the first engaging portion 13, the other end is arc-shaped, and the arc-shaped opening 131 faces the second engaging portion 211, when the second engaging portion 211 slides towards the first engaging portion 13, because of the initial engagement, and the second engaging portion 211 is fixed by external force, then the first engaging portion 13 will rotate to match the second engaging portion, when fully engaged, the contour parallel to the axial center can effectively fix the first engaging portion 13, so as to play a stabilizing role.

One specific application of this embodiment is:

the utility model has an inner shaft 1 and a shaft sleeve component 2 matched with the inner shaft 1, the inner shaft 1 is provided with a limit sleeve 11, a first embedded part 13 and a movably connected screwdriver head 12, the shaft sleeve component 2 is provided with an inner shaft sleeve 21 arranged between the first embedded part 13 and the limit sleeve 11 and an outer shaft sleeve 22 fixedly connected with the inner shaft sleeve 21, when the shaft sleeve component is used for loosening steel plate screws, the outer shaft sleeve 22 is held by one hand, the screwdriver head 12 is aligned to the steel plate screws, when in use, only one end of the outer shaft sleeve 22 far away from the screwdriver head 12 is needed to be knocked, the outer shaft sleeve 22 can slide towards the direction close to the steel plate screws, and then the inner shaft sleeve 21 is driven to slide, the second embedded part 211 of the inner shaft sleeve 21 guides the first embedded part 13 to rotate, and then the inner shaft 1 is synchronously driven to rotate, so as to achieve the effect of loosening the steel plate screws, and an elastic element 24 is arranged between the outer shaft sleeve, the process is stable and efficient.

To sum up, the utility model discloses can effectively take out the steel sheet screw, have stable efficient advantage.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element 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.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. Internal fixation screw takes out system, its characterized in that: the screw rod comprises an inner shaft (1) and a shaft sleeve assembly (2) sleeved on the inner shaft (1), wherein one end of the inner shaft (1) is fixedly connected with a limiting sleeve (11), the other end of the inner shaft (1) is movably connected with a screwdriver head (12) used for loosening screws, one end of the inner shaft (1) close to the screwdriver head (12) is fixedly connected with a first embedded part (13), the shaft sleeve assembly (2) comprises an inner layer shaft sleeve (21) sleeved between the limiting sleeve (11) and the first embedded part (13), one end of the inner layer shaft sleeve (21) is provided with a second embedded part (211) used for being matched with the first embedded part (13), the inner diameter of the inner layer shaft sleeve (21) is smaller than the outer diameter of the limiting sleeve (11), an outer layer shaft sleeve (22) is sleeved outside the inner layer shaft sleeve (21), a fastening device (23) is arranged between the inner layer shaft sleeve (21) and the outer layer shaft sleeve (22), and the outer layer shaft sleeve (22) extends and closes, and an elastic element (24) is arranged between the limiting sleeve (11), when the outer layer shaft sleeve (22) slides towards the first embedding part (13), the second embedding part (211) of the inner layer shaft sleeve (21) guides the first embedding part (13) to rotate in the circumferential direction, so that the screwdriver head (12) is driven to rotate synchronously.

2. The internal fixation screw extraction system of claim 1, wherein: the first embedding part (13) is annular, an opening (131) is symmetrically formed in one end, close to the second embedding part (211), of the first embedding part, and the cross section of the opening (131) is gradually reduced along the direction far away from the second embedding part (211).

3. The internal fixation screw extraction system of claim 2, wherein: one end of the outline of the opening (131) is arranged in parallel along the axial center direction of the first embedding part (13), the other end of the outline of the opening is arc-shaped, and the arc-shaped opening (131) faces the second embedding part (211).

4. The internal fixation screw extraction system of claim 1, wherein: a plurality of threaded holes (231) are formed in the inner-layer shaft sleeve (21) in the circumferential direction along the length direction of the inner-layer shaft sleeve, through holes are formed in the outer-layer shaft sleeve (22) in a penetrating mode corresponding to the positions of the threaded holes (231), fastening screws (232) penetrate through the threaded holes (231), and the threaded holes (231) and the fastening screws (232) are matched to form the fastening device (23).

5. The internal fixation screw extraction system of claim 4, wherein: a counter bore (221) is formed in the position, located at the through hole, of the outer wall of the outer layer shaft sleeve (22), and an arc-shaped gasket is arranged between the head of the screw and the counter bore (221).

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