CN211534765U

CN211534765U - Extractor for intramedullary broken needle

Info

Publication number: CN211534765U
Application number: CN201922016692.XU
Authority: CN
Inventors: 周金华
Original assignee: Liyang Peoples Hospital
Current assignee: Liyang Peoples Hospital
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-09-22
Anticipated expiration: 2029-11-20

Abstract

The utility model belongs to the technical field of medical auxiliary instruments, in particular to an intramedullary broken needle extractor, which comprises an outer tube and an inner tube, wherein the outer tube and the inner tube are metal hoses, a conical open cavity is arranged at the front end orifice of the outer tube, the inner end with smaller open cavity is connected with the inner cavity of the outer tube, a chuck is arranged at the open cavity, the rear end of the chuck is detachably connected with the front end of the inner tube, a control rod is arranged inside the inner tube, a hand-held handle is arranged at the rear end of the outer tube, a control handle movably connected with the hand-held handle is arranged at the rear part of the hand-held handle, the rear end of the inner tube is connected with the control handle, the control handle controls the inner tube to move back and forth in the outer tube, the control rod is a flexible rod, a through hole which penetrates through from front to back is arranged at the upper part of the control handle, a rotatable nut is arranged at the through hole, the guide pin broken in the marrow can be conveniently taken out, and the operation is convenient.

Description

Extractor for intramedullary broken needle

Technical Field

The utility model belongs to the technical field of medical auxiliary instrument, concretely relates to broken needle extractor in marrow.

Background

The guide pin is a commonly used medical instrument and is used for traction, positioning or fixation in the fracture operation process, when the marrow is expanded, the guide pin is easy to break, a broken needle at the proximal end of a bone is easy to take out, once the broken needle is at the distal end, the broken guide pin is difficult to take out, the existing instrument has higher needle taking operation difficulty and is generally a rigid part, the needle cannot be properly bent according to the shape and the structure of a medullary cavity, the phenomenon of interference between the needle taking instrument and the medullary cavity is serious when the needle is inserted into the medullary cavity, and the operation efficiency is greatly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to above-mentioned defect, provide an intramedullary broken needle extractor, can be convenient will break the guide pin in the intramedullary and take out convenient operation.

The utility model provides a technical scheme that its technical problem adopted as follows:

an intramedullary broken needle extractor comprises an outer tube and an inner tube which can slide in the outer tube along the axial direction, wherein the outer tube and the inner tube are metal hoses, a conical opening cavity is arranged at the front end of the outer tube, the inner end with the smaller opening cavity is connected with the inner cavity of the outer tube, a chuck is arranged at the opening cavity, the rear end of the chuck is detachably connected with the front end of the inner tube, a control rod is arranged inside the inner tube, the front end of the control rod is connected with a movable part of the chuck to control the opening/closing of the chuck, a handheld handle is arranged at the rear end of the outer tube, a control handle movably connected with the handheld handle is arranged at the rear part of the handheld handle, the rear end of the inner tube is connected with the control handle, the control handle controls the inner tube to move back and forth in the outer tube, the control rod is a flexible rod, a through hole penetrating through the front and back is arranged at the upper part of the control handle, a rotatable nut, the rear part of the control rod is in threaded fit with the nut.

Further, the chuck include the (holding) chuck, a plurality of clamping jaw, the rear end of clamping jaw and (holding) chuck front end swing joint, a plurality of clamping jaws are along (holding) chuck circumference evenly distributed, the middle part of clamping jaw is equipped with even board, even board and clamping jaw swing joint, the (holding) chuck front side is equipped with a drawing disk, the drawing disk is in the middle department of a plurality of clamping jaws, drawing disk and (holding) chuck coaxial axis, even one end and even board swing joint that the board is close to the drawing disk, the axle center department of (holding) chuck is equipped with one and follows gliding connecting rod around the axial, the front end and the drawing disk of connecting rod are connected, the rear end of connecting rod extends to (holding) chuck rear side, the rear end shaft body of connecting rod is equipped with the external screw thread, the front end threaded connection of connecting rod rear end and control lever, the rear end and the inner tube.

Furthermore, the front end of the control rod is provided with an internal thread matched with the external thread of the connecting rod, the rear part of the chuck is provided with a boss which is convex at the back, and the front end of the inner tube is provided with a boss cavity connected with the boss through threads.

Furthermore, the inner wall surface of the clamping jaw is provided with an anti-skid glue layer.

Further, the number of the clamping jaws is three.

Further, the number of the clamping jaws is two.

Furthermore, the inner wall of the opening cavity is provided with an elastic part protruding towards the axle center.

Furthermore, the elastic piece is an arc-shaped elastic piece arranged on the inner wall of the opening cavity.

Furthermore, the elastic piece is an elastic rubber cushion arranged on the inner wall of the opening cavity.

The utility model has the advantages that: by adopting the scheme, the structure is simple, the operation is convenient, the outer tube, the inner tube and the control rod can be deformed, the outer tube, the inner tube and the control rod can be properly bent and deformed according to the structure of the bone medullary cavity, the outer tube, the inner tube and the control rod are matched with the structure of the medullary cavity after being inserted into the bone medullary cavity, the interference phenomenon between the outer tube and the medullary cavity is avoided, the needle taking operation is convenient, the operation difficulty is reduced, the reliability of clamping the broken needle by the chuck is remarkably improved, and.

Drawings

The foregoing and other objects, features, and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic view of a partial cross-sectional structure of an open cavity according to an embodiment of the present invention.

Fig. 3 is a schematic partial cross-sectional structure diagram of a fitting portion between the collet and the inner tube according to an embodiment of the present invention.

Fig. 4 is an enlarged schematic view of a partial cross-sectional structure of an inner wall of a clamping jaw according to an embodiment of the present invention.

Wherein: the structure comprises an outer tube 1, an opening cavity 11, a handheld handle 12, an inner tube 2, a control handle 21, a boss cavity 22, a nut 23, a through hole 211, a chuck 3, a chuck 31, a boss 311, a clamping jaw 32, a connecting plate 33, a pull disc 34, a connecting rod 35, an anti-skid convex pattern 321, an anti-skid glue layer 322, a control rod 4 and an inner concave cavity 41.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Example 1: referring to fig. 1, an intramedullary broken needle extractor comprises an outer tube 1 and an inner tube 2 which can slide in the outer tube 1 along the axial direction, wherein the outer tube 1 and the inner tube 2 are metal hoses, preferably, the inner tube and the outer tube can adopt medical spring tubes, the outer wall of each spring tube is provided with a plastic coating layer which enables the outer tube wall to be smooth and convenient to insert into the intramedullary, the outer tube and the inner tube have good bending deformation capacity, when the outer tube and the inner tube are inserted into the bone intramedullary, the outer tube and the inner tube can better conform to the shape of the bone and are convenient to better extract the needle, the needle extraction difficulty is reduced, particularly, when the broken needle is deeper, the outer tube and the inner tube are convenient to insert and extract, the bone intramedullary canal has less interference on the outer tube, meanwhile, the inner tube has good rigid support performance and is convenient to flexibly slide in the outer tube, a conical opening cavity 11 is arranged at the front end of the outer tube 1, the smaller inner end of the opening cavity 11 is connected with, the opening cavity 11 is provided with a chuck 3, the rear end of the chuck 3 is detachably connected with the front end of the inner tube 2 through thread matching, the inner part of the inner tube 2 is provided with a control rod 4 of a flexible rod, the front end of the control rod 4 is connected with the movable part of the chuck 3 to control the opening/closing of the chuck, the rear end of the outer tube 1 is provided with a handheld handle 12, the rear part of the handheld handle 12 is provided with a control handle 21 movably connected with the handheld handle 12, the rear end of the inner tube 2 is connected with the upper part of the control handle 21, the middle part of the control handle 21 is provided with a connecting part protruding forwards, the front end of the connecting part is hinged with the middle part of the handle body of the handheld part 12, the bottom ends of the control handle 21 and the handheld handle 12 are provided with annular parts convenient for fingers to insert, the fingers are inserted into the annular parts to correspondingly operate the control handle and the handheld handle, the upper part of the control handle can move forwards and, the inner tube is pushed out of the front end of the outer tube or retracted into the outer tube, the inner tube is in a retracted state in a normal state, the chuck 3 is in an open cavity, the outer tube is inserted into marrow during use, the control handle controls the inner tube to be pushed out when a broken needle is located, the chuck is controlled to be opened through the control rod to clamp the tail of the broken needle, the inner tube retracts again, the outer tube is pulled out to take out the broken needle, and the operation is convenient and fast.

Specifically, referring to fig. 2 and 3, the chuck 3 includes a chuck 31 and three clamping jaws 32, the rear ends of the clamping jaws 32 are movably connected with the front end of the chuck 31 by pins, the three clamping jaws are uniformly distributed along the circumferential direction of the chuck, a connecting plate 33 is arranged in the middle of the clamping jaws 32, the connecting plate 33 is movably connected with the clamping jaws 32 by pins, a pull plate 34 is arranged on the front side of the chuck 31, the pull plate 34 is located at the center of the three clamping jaws 32, the pull plate 34 is coaxial with the chuck 31, one end of the connecting plate 33 close to the pull plate 34 is movably connected with the connecting plate 33 by pins, the pull plate 34 is coaxial with the chuck 31, the pull plate is relatively balanced by the pull plate 34 located at the center of the clamping jaws, so that the three clamping jaws are synchronously opened or closed, the clamping force and the clamping effect on the broken needle are improved, a connecting rod 35 capable of sliding back and forth along the axial direction is arranged at the axial center of the chuck 31, the front end, the rear end of the connecting rod 35 extends to the rear side of the chuck 31, the rod body at the rear end of the connecting rod 35 is provided with an external thread, the front end of the control rod 4 is provided with an inner concave cavity 41 matched with the external thread of the connecting rod 35, an internal thread is arranged in the inner concave cavity 41, the rear part of the chuck 31 is provided with a boss 311 which is convex backwards, the surface of the boss 311 is provided with an external thread, the front end of the inner tube 2 is provided with a boss cavity 22 in threaded connection with the boss 311, the inner wall of the boss cavity is provided with an internal thread, the internal thread pitch, the thread form and the spiral direction of the internal thread of the boss cavity and the inner concave cavity are consistent, the chuck is convenient to be connected with the inner tube, when the chuck is installed, the connecting rod is aligned with the control rod, the chuck is aligned with the inner tube to be in threaded connection, the chuck is convenient to be detached, the replacement efficiency of the chuck is convenient to be improved, the upper part, meanwhile, the control rod passes through the nut, the rod body of the control rod is in threaded fit with the nut 23, the nut 23 and a control handle at the through hole are in rotatable fit with one end of the nut, can disguise the through hole and are matched with the through hole through a bearing, the other end of the nut leaks out of the through hole for rotating operation, the nut is rotated positively and negatively to realize the back and forth movement of the control rod, the control rod pulls the pull rod to move forwards and backwards to drive the chuck to move forwards and backwards, the connecting plate pulls the clamping jaws to open and close to realize the opening/closing of the chuck, and the broken needle is clamped or loosened, the structure is simple, the operation and the control are convenient and the clamping is reliable, in order to improve the reliability of the chuck in clamping the broken needle, a plurality of anti-skid convex patterns 321 are arranged on the inner wall of the clamping jaw 32, an anti-skid glue layer, the reliability of the broken needle clamping is improved, the control rod is a flexible rod, the control rod is convenient to fit with the outer tube and the inner tube structure and fit with the bone marrow cavity structure, and the smoothness and the reliability of the operation and control are improved.

Specifically, referring to fig. 2, 11 inner walls of open cavity correspond clamping jaw departments and are equipped with to axle center department protrusion arc shell fragment 5, after the broken needle was cliied to the chuck, the inner tube withdrawal was established the open cavity cover at the broken needle rear portion, and the in-process that the chuck rolled back, and the arc shell fragment can extrude the clamping jaw, applys extra pressure to the clamping jaw, and the reliability of taking out to the broken needle centre gripping is improved to the clamping force of increase clamping jaw, the utility model has the advantages of simple structure, the convenience of operation is good, reduces the degree of difficulty of taking out of broken needle, helps improving operation efficiency.

Example 2: referring to fig. 1 to 4, the embodiment is different from embodiment 1 in that the number of the clamping jaws in the embodiment is two, the chuck can be replaced according to specific needle taking requirements and different guide pin structures, corresponding numbers of clamping jaws are selected, operability of needle taking and reliability of needle breaking clamping are improved, an elastic rubber pad protruding towards the axis is arranged on the inner wall of the open cavity 11 corresponding to the clamping jaw, the clamping jaw is squeezed by the elastic rubber pad, extra pressure is applied to the clamping jaw, and clamping force of the clamping jaw on the broken needle is increased.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the techniques of the present invention are substantially any simple modification and equivalent changes to the above embodiments, all falling within the protection scope of the present invention.

Claims

1. An intramedullary broken needle extractor is characterized by comprising an outer tube and an inner tube which can slide in the outer tube along the axial direction, wherein the outer tube and the inner tube are both metal hoses, a conical open cavity is arranged at the front end orifice of the outer tube, the inner end with the smaller open cavity is connected with the inner cavity of the outer tube, a chuck is arranged at the open cavity, the rear end of the chuck is detachably connected with the front end of the inner tube, a control rod is arranged inside the inner tube, the front end of the control rod is connected with a movable part of the chuck to control the opening/closing of the chuck, a handheld handle is arranged at the rear end of the outer tube, a control handle movably connected with the handheld handle is arranged at the rear part of the handheld handle, the rear end of the inner tube is connected with the control handle, the control handle controls the inner tube to move back and forth in the outer tube, the control rod is a flexible rod, a through hole penetrating through the front and the rear part of the control handle is provided with a rotatable nut, the rear part of the control rod is in threaded fit with the nut.

2. The intramedullary broken needle extractor according to claim 1, wherein the chuck comprises a chuck plate and a plurality of clamping jaws, the rear ends of the clamping jaws are movably connected with the front end of the chuck plate, the clamping jaws are evenly distributed along the circumferential direction of the chuck plate, a connecting plate is arranged in the middle of each clamping jaw and movably connected with the clamping jaws, a pull disc is arranged on the front side of the chuck plate and positioned in the middle of the clamping jaws, the pull disc and the chuck plate are coaxial, one end of the connecting plate, which is close to the pull disc, is movably connected with the connecting plate, a connecting rod capable of sliding back and forth along the axial direction is arranged at the axis of the chuck plate, the front end of the connecting rod is connected with the pull disc, the rear end of the connecting rod extends to the rear side of the chuck plate, an external thread is arranged on the rod body at the rear end of the connecting rod, the rear end of the connecting rod is in threaded connection with the front end of the control rod, the.

3. The intramedullary broken needle extractor according to claim 2, wherein the front end of the control rod is provided with an internal thread matching with the external thread of the connecting rod, the rear part of the chuck is provided with a boss protruding backwards, and the front end of the inner tube is provided with a boss cavity in threaded connection with the boss.

4. The intramedullary broken needle extractor of claim 2, wherein the inner wall surface of the clamping jaw is provided with an anti-slip glue layer.

5. An intramedullary broken needle extractor according to claim 2 wherein the number of jaws is three.

6. An intramedullary broken needle extractor according to claim 2 wherein the number of jaws is two.

7. The intramedullary broken needle extractor according to claim 1, wherein the inner wall of the open cavity is provided with an elastic member protruding toward the axial center.

8. The intramedullary broken needle extractor of claim 7, wherein the elastic member is an arc-shaped elastic sheet disposed on the inner wall of the opening cavity.

9. The intramedullary broken needle extractor of claim 7, wherein the elastic member is an elastic rubber pad disposed on an inner wall of the open cavity.