CN214632311U

CN214632311U - Universal accurate acetabular cup nail extractor

Info

Publication number: CN214632311U
Application number: CN202022774195.9U
Authority: CN
Inventors: 刘娟; 周海利
Original assignee: Tianyan Medical Equipment Co ltd
Current assignee: Tianyan Medical Equipment Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-11-09
Anticipated expiration: 2030-11-26

Abstract

The utility model discloses a universal accurate acetabular cup nail extractor, which comprises a handle, wherein one side of the handle is provided with a connecting rod, the inside of the connecting rod is hollow, a nail extracting rod is arranged in the connecting rod, one end of the nail extracting rod, which penetrates out of the connecting rod, is provided with a rear fork, one side of the rear fork, which is far away from the connecting rod, is provided with a front fork, the rear fork and the front fork are connected through a hinge structure, one side of the rear fork, which faces the front fork, is provided with a first flange, one side of the front fork, which faces the rear fork, is provided with a second flange, a resistance spring is arranged between the first flange and the second flange, one end of the front fork, which is far away from the rear fork, is provided with a nail head, the head of the nail extractor can rotate, a doctor can accurately align the screw of the acetabular cup conveniently, the problem that the nail extractor is difficult to operate is solved, the resistance spring provides one resistance to the hinge structure, so that the head of the nail extractor has a certain resistance when rotating, the hand feeling of a user is enhanced, and the screw position of the acetabular cup is quickly and accurately positioned.

Description

Universal accurate acetabular cup nail extractor

Technical Field

The invention relates to the technical field of medical instruments, in particular to a universal accurate acetabular cup nail extractor.

Background

The therapeutic efficacy of artificial hip replacement surgery has been well established and developed as a reliable treatment for over thirty years of clinical practice. The main purposes of artificial joint replacement are to relieve joint pain, correct deformity, and restore and improve the motor function of the joint.

In hip surgery, the fixation and removal of the implant requires the use of screws and nail extractors. In operation, the fixing force of the screw is controlled by the experience value of a doctor, the size of the screw is not limited, and the body is damaged due to too large force; or too small, the screw fixation is unstable. The implantation angle is determined by visual observation to determine the approximate orientation, when the acetabular cup is fixed, the prosthesis can be displaced, the ideal angle cannot be reached, and the prosthesis is easy to dislocate after operation to cause revision.

The invention discloses a universal accurate acetabular cup nail extractor which is used for solving the problems.

Disclosure of Invention

The invention aims to provide a universal accurate acetabular cup nail extractor to solve the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme: the universal precise acetabular cup nail extractor comprises a handle, wherein a connecting rod is arranged on one side of the handle, the connecting rod is hollow, a nail extracting rod is arranged in the connecting rod, a rear fork is arranged at one end, penetrating out of the connecting rod, of the nail extracting rod, a front fork is arranged on one side, far away from the connecting rod, of the rear fork, the rear fork and the front fork are connected through a hinge structure, so that the head of the nail extractor can rotate freely, the acetabular cup is a prosthesis at the position of a femur of a human body, a doctor needs to operate at the position of an acetabular socket in the surgical process, the surgical space is limited and complicated, the head of the nail extractor can rotate, the screw for the precise alignment of the acetabular cup by the doctor is convenient, the problem that the nail extractor is difficult to operate is solved, a first flange is arranged on one side, facing the front fork, a second flange is arranged on one side, facing the rear fork, and a resistance spring is arranged between the first flange and the second flange, the resistance spring gives a resistance to the hinged structure, so that the head of the screw taking device has a certain resistance when rotating, the hand feeling of a user is enhanced, the screw position of the acetabular cup is quickly and accurately positioned, the screw lifting head is arranged at one end of the front fork, which is far away from the rear fork, and is used for being inserted into the hole at the head of the screw, and then the screw taking device is rotated to take out the screw.

Preferably, the hinge structure includes recess, fixed block, connecting block, pin, the one end that the front fork faced the back fork is provided with the recess, be provided with the fixed block in the recess, the one end that the back fork is close to the front fork is provided with the connecting block, connecting block and fixed block pass through the pin and articulate, and during the use, back fork and front fork use the pin to rotate as the axle center, but through the front fork drive nail head free rotation.

Preferably, the fixed block is connected with the front fork through a fixing pin, the rear fork is connected with the extension rod through a fixing pin II, and the rear fork and the connecting block are integrally formed.

Preferably, the screw-up head is a spiral hexagonal head, the screw-up head of the spiral hexagonal head is inserted into the screw head hole, the screw can be clamped, and in the process of rotating the screw extractor, the clamping force of the screw-up head on the screw is larger and larger, so that the screw is prevented from falling.

Preferably, one end of the connecting rod, which is positioned at the nail taking rod, is sequentially provided with a first pressing block, a torsion spring, a second pressing block and a screw rod, the screw rod is in threaded connection with the inner wall of the connecting rod, one end of the screw rod penetrates out of the connecting rod, one end of the screw rod, which penetrates out of the connecting rod, is fixedly connected with the handle through a pin, the first pressing block is connected with the nail taking rod through a slipping tooth, the nail taking device can be used for screwing a screw at the same time, when the screw is screwed in a general operation, the screw needs to be screwed to a proper force, the screw thread is damaged due to too large force, the acetabular cup is easy to loosen due to too small force, the acetabular cup needs to be replaced seriously, and even repaired after the operation, so that the screwing of the screw to the proper force is important, when the nail taking device is used, the torsion of the nail taking device can be adjusted firstly, namely the handle is rotated to drive the screw rod to make threaded connection with the inner wall of the connecting rod, the screw rod moves along the inner wall of the connecting rod, and sequentially presses the second pressing block, the screw rod, The screw taking device comprises a torsion spring and a first pressing block, so that the pressure of the first pressing block on the screw taking rod is changed, namely, the sliding limit torsion of the first pressing block and the screw taking rod is changed, when the screw taking rod is rotated to exceed the limit torsion, the first pressing block and the screw taking rod slide, and the screw taking device cannot be screwed continuously.

Preferably, the side walls of the connecting rod and the nail taking rod are provided with stoppers, the stoppers enable the nail taking rod to slightly move relative to the connecting rod but cannot rotate relative to the connecting rod, when the rotation of the nail taking rod reaches a limit torque force, the slightly moving space assists the occurrence of slippage, and the limit torque force is prevented from changing due to the failure of slipping teeth.

Preferably, connect the pole middle part and be provided with the rotation stopping piece, the rotation stopping piece cup joints on connecting the pole, the inside bullet arm that is provided with of rotation stopping piece, it is provided with the bullet arm groove to connect the outside position that corresponds with the bullet arm of pole, play the arm and rotation stopping piece fixed connection, the rotation stopping piece is close the inside rotation stopping strip that is provided with of one end of handle, the handle is provided with the rotation stopping recess with the position that rotation stopping strip corresponds, because rotation stopping strip is located rotation stopping recess, plays the arm joint in the bullet arm groove, so the handle can not rotate for connecting the pole, when needing to adjust limit torsion, and the manual promotion rotation stopping piece for in the rotation stopping strip roll-off rotation stopping recess groove, the bullet arm roll-off bullet arm inslot, rotation stopping piece disappears the effect of rotation stopping the handle, and the handle is rotatable for connecting the pole, and the rotation handle drives the screw rod and adjusts torsion.

Preferably, get and still connect through the elasticity roof beam between nail pole and the pressure movable block, the one side that lies in getting the nail pole on the elasticity roof beam is provided with the foil gage No. one, the one side that lies in the pressure movable block on the elasticity roof beam is provided with the foil gage No. two, a foil gage, No. two foil gages and elasticity roof beam glue the adhesion through melting glass a little, it is provided with the display screen to connect the pole outside, a foil gage, No. two foil gages and display screen electric connection, the display screen is used for showing torsion size, when the rotatory limit torsion of getting nail pole to a pressure movable block and getting the nail pole and skidding, the display screen can warn to stop to last the rotation, and the display screen is used for showing torsion size in real time simultaneously, makes things convenient for the operator to refer to.

Compared with the prior art, the invention has the following beneficial effects:

1. in the operation process, a doctor needs to operate at the position of an acetabulum socket, the operation space is limited and complicated, the head of the nail extractor disclosed by the invention can rotate, the doctor can conveniently and accurately align the screw of the acetabulum cup, the problem that the nail extractor is difficult to operate is solved, and the resistance spring provides a resistance to the hinged structure, so that the head of the nail extractor has a certain resistance when rotating, the hand feeling of the user is enhanced, and the screw position of the acetabulum cup is quickly and accurately positioned;

2. the screw-removing head of the hexagonal screw is inserted into the screw head hole, so that the screw can be clamped, and in the process of rotating the screw extractor, the clamping force of the screw-removing head on the screw is increased, so that the screw is prevented from falling;

3. when the screw is screwed in a general operation, the screw needs to be screwed to proper force, the screw teeth are damaged due to too large force, the acetabular cup is easy to loosen due to too small force, the acetabular cup needs to be replaced when the force is serious, and even the screw is repaired after the operation, so that the screwing of the screw to the proper force is important;

4. the display screen can show the torsion size, gets when the nail pole is got to a pressure movable block and get the limit torsion that the nail pole skidded when the rotation, the display screen can warn to stop to last the rotation, and the display screen is used for showing the torsion size in real time simultaneously, makes things convenient for the operator to refer to.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a front view of the universal precision acetabular cup staple remover of the present invention;

FIG. 2 is a cross-sectional view of the invention at detail A;

FIG. 3 is a cross-sectional view of the universal precision acetabular cup pin extractor of the present invention;

FIG. 4 is a detail view of the invention at B;

FIG. 5 is a detail view of the invention at C;

in the figure: 1. a handle; 2. a connecting rod; 3. a rear fork; 4. a front fork; 5. a first flange is convex; 6. the second edge is convex; 7. A resistance spring; 8. a groove; 9. a fixed block; 10. connecting blocks; 11. a first fixing pin; 12. a second fixing pin; 13. taking a nail rod; 14. pressing the movable block; 15. a torsion spring; 16. pressing the moving block; 17. a screw; 18. slipping the teeth; 19. stopping; 20. a rotation stopping block; 21. a spring arm; 22. a spring arm groove; 23. a rotation stopping strip; 24. a rotation stopping groove; 25. an elastic beam; 26. a first strain gauge; 27. a second strain gauge; 28. a display screen; 29. a hinge structure; 30. a pin; 31. and (5) raising the nail head.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): referring to fig. 1 to 5, the present invention provides a technical solution: universal accurate acetabular cup nail extractor comprises a handle 1, a connecting rod 2 is arranged on one side of the handle 1, the connecting rod 2 is hollow, a nail extracting rod 13 is arranged in the connecting rod 2, a rear fork 3 is arranged at one end of the nail extracting rod 13, which penetrates out of the connecting rod 2, one side of the rear fork 3, which is far away from the connecting rod 2, is provided with a front fork 4, the rear fork 3 and the front fork 4 are connected through a hinge structure 29, so that the head of the nail extractor can rotate freely, an acetabular cup is a prosthesis at the position of human femur, a doctor needs to operate at the position of an acetabular fossa during an operation, the operation space is limited and complicated, the head of the nail extractor can rotate 360 degrees, the doctor can aim at a screw of the acetabular cup accurately conveniently, the problem that the nail extractor is difficult to operate is solved, a first flange 5 is arranged on one side of the front fork 3, a second flange 6 is arranged on one side of the front fork 4, and a resistance spring 7 is arranged between the first flange 5 and the second flange 6, resistance spring 7 gives hinge structure 29 a resistance for certain resistance has when getting the nail ware head rotatory, strengthens user's feeling, and then the screw position of quick accurate location acetabular cup, the one end that the back fork 3 was kept away from to front fork 4 is provided with nail nipping head 31, and nail nipping head 31 is used for inserting the screw head downthehole, rotates again and gets the nail ware, takes out the screw.

The hinge structure 29 comprises a groove 8, a fixing block 9, a connecting block 10 and a pin 30, wherein the groove 8 is formed in one end, facing the rear fork 3, of the front fork 4, the fixing block 9 is arranged in the groove 8, the connecting block 10 is arranged at one end, close to the front fork 4, of the rear fork 3, the connecting block 10 is hinged to the fixing block 9 through the pin 30, and when the hinge structure is used, the rear fork 3 and the front fork 4 rotate by taking the pin 30 as an axis and the pin head 31 is driven to rotate freely through the front fork 4.

The fixed block 9 is connected with the front fork 4 through a first fixed pin 11, the rear fork 3 is connected with the extension rod 2 through a second fixed pin 12, and the rear fork 3 and the connecting block 10 are integrally formed.

The nail nipping head 31 is a spiral hexagonal shape, the nail nipping head 31 of the spiral hexagonal shape is inserted into the head hole of the screw, the clamping of the screw can be completed, in the process of rotating the nail extractor, the clamping force of the nail nipping head 31 to the screw is larger and larger, and the screw is prevented from falling.

One end of the connecting rod 2, which is positioned at the screw taking rod 13, is sequentially provided with a first pressing block 14, a torsion spring 15, a second pressing block 16 and a screw rod 17, the screw rod 17 is in threaded connection with the inner wall of the connecting rod 2, one end of the screw rod 17 penetrates out of the connecting rod 2, one end of the screw rod 17, which penetrates out of the connecting rod 2, is fixedly connected with the handle 1 through a pin, the first pressing block 14 is connected with the screw taking rod 13 through a slip-off tooth 18, the screw taking device can be used for screwing the screw at the same time, when the screw is screwed in a general operation, the screw needs to be screwed to a proper force, the screw thread is damaged due to excessive force, the acetabular cup is easy to loosen due to insufficient force, the acetabular cup needs to be replaced seriously, and even repaired after the operation, so that the screwing of the screw to the proper force is important, when the screw taking device is used, the torsion of the screw taking device can be adjusted firstly, namely the handle 1 is rotated to drive the screw rod 17 and the inner wall of the connecting rod 2 to make threaded connection movement, and the screw rod 17 moves along the inner wall of the connecting rod 2, the second pressing block 16, the torsion spring 15 and the first pressing block 14 are pressed in sequence, so that the pressure of the first pressing block 14 on the nail taking rod 13 changes, namely, the sliding limit torque of the first pressing block 14 and the nail taking rod 13 is changed, when the nail taking rod 13 is rotated to exceed the limit torque, the first pressing block 14 and the nail taking rod 13 slide, and the nail taking device cannot be screwed continuously.

The side walls of the connecting rod 2 and the nail taking rod 13 are provided with a stop 19, the stop enables the nail taking rod 13 to slightly move relative to the connecting rod 2 but not to rotate relative to the connecting rod 2, when the rotation of the nail taking rod 13 reaches a limit torque, the slightly moving space assists the occurrence of slippage, and the change of the limit torque caused by the failure of the slippage teeth 18 is prevented.

Connect pole 2 middle part to be provided with the piece 20 that splines, the piece 20 that splines cup joints on connecting pole 2, the inside bullet arm 21 that is provided with of the piece 20 that splines, connect the outside position that corresponds with bullet arm 21 of pole 2 to be provided with bullet arm groove 22, bullet arm 21 and the piece 20 fixed connection that splines, the piece 20 that splines is close to the inside strip 23 that splines of being provided with of one end of handle 1, handle 1 and the position that the strip 23 that splines corresponds are provided with the groove 24 that splines, because the strip 23 that splines is located the groove 24 that splines, bullet arm 21 joint is in bullet arm groove 22, so handle 1 can not rotate for connecting pole 2, when needing to adjust limit torsion, manual promotion block 20 that splines, make in the strip 23 roll-off groove 24 that splines, in the strip 21 roll-off bullet arm groove 22 that splines, the effect that splines of the piece 20 to handle 1 disappears, handle 1 is rotatable for connecting pole 2, it drives screw rod 17 to adjust torsion to rotate the handle.

The nail taking rod 13 is connected with the first pressing block 14 through an elastic beam 25, a first strain gauge 26 is arranged on one side, located on the nail taking rod 13, of the elastic beam 25, a second strain gauge 27 is arranged on one side, located on the first pressing block 14, of the elastic beam 25, the first strain gauge 26, the second strain gauge 27 and the elastic beam 25 are adhered through micro-melting glass cement, a display screen 28 is arranged outside the connecting rod 2, the first strain gauge 26, the second strain gauge 27 and the display screen 28 are electrically connected, the display screen 28 is used for displaying the torque, when the nail taking rod 13 is rotated to the limit torque of the first pressing block 14 and the nail taking rod 13 slipping, the display screen 28 can warn to stop continuous rotation, meanwhile, the display screen 28 is used for displaying the torque in real time, and is convenient for an operator to refer to.

The working principle of the invention is as follows: when the screw is taken out, firstly, the universal precise acetabular cup screw extractor is adjusted to a proper torsion, then the screw pulling head 31 extends into the acetabular cup, the screw pulling head 31 rotates at a certain angle through the hinge structure 29 and the screw taking rod 13, and simultaneously, the resistance spring 7 gives a resistance to the hinge structure 29, so that the screw pulling head 31 has a certain resistance when rotating, the hand feeling of a user is enhanced, the screw position of the acetabular cup is rapidly and precisely positioned, the handle 1 is manually rotated after the positioning is finished, the connecting rod 2 and the screw taking rod 13 are sequentially driven to rotate, the screw thread is loosened, the torsion displayed by the display screen 28 is observed in real time in the rotating process, and if the torsion value is about to exceed the torsion value, the rotation is stopped, the screw extractor is adjusted to a proper torsion again, and the screw taking-out action is finished;

when the screw is screwed, the universal precise acetabular cup screw extractor is adjusted to a proper torsion, then the screw pulling head 31 extends into the screw to clamp the screw, then the screw pulling head 31 extends into the acetabular cup to screw, the torsion displayed by the display screen 28 is observed in real time during the screwing process, if the torsion value is about to exceed the torsion value, the screwing is stopped, the mounting action of the screw is completed, and if the screwing is continued, the first pressing block 14 and the screw taking rod 13 can slip to protect the screw teeth from being damaged;

the principle of torsion regulation is as follows: the handle 1 is rotated to drive the screw rod 17 and the inner wall of the connecting rod 2 to do threaded motion, the screw rod 17 moves along the inner wall of the connecting rod 2, and the second pressing block 16, the torsion spring 15 and the first pressing block 14 are pressed in sequence, so that the pressure of the first pressing block 14 on the nail taking rod 13 is changed, namely the slipping limit torsion of the first pressing block 14 and the nail taking rod 13 is changed;

the principle of the torque force displayed by the display 28 is as follows: through the twisting of the elastic beam 25, the first strain gauge 26 and the second strain gauge 27 sense the resistance change and transmit the resistance change to the controller, and the controller converts the resistance signal into a digital signal and transmits the digital signal to the display screen 28 for displaying.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Universal accurate acetabular cup nail extractor, including handle (1), its characterized in that: handle (1) one side is provided with connects pole (2), connect the inside cavity of pole (2), it is provided with in pole (2) to get to bind to be provided with back vent (3) to get to bind to the pole (13) and wear out and connect the outer one end of pole (2), one side that pole (2) were kept away from in back vent (3) is provided with front fork (4), connect through hinge structure (29) between back vent (3) and front fork (4), back vent (3) are provided with No. one along protruding (5) to one side of front fork (4), one side that front fork (4) face back vent (3) is provided with No. two along protruding (6), be provided with resistance spring (7) between No. one along protruding (5) and No. two along protruding (6), the one end that back vent (3) were kept away from in front fork (4) is provided with nail head (31).

2. The universal precision acetabular cup pin extractor of claim 1, wherein: articulated structure (29) include recess (8), fixed block (9), connecting block (10), pin (30), the one end that front fork (4) faced back vent (3) is provided with recess (8), be provided with fixed block (9) in recess (8), the one end that back vent (3) are close to front fork (4) is provided with connecting block (10), connecting block (10) and fixed block (9) are articulated through pin (30), during the use.

3. The universal precision acetabular cup pin extractor of claim 2, wherein: fixed block (9) and front fork (4) are connected through a fixed pin (11), back fork (3) and extension pole (2) are connected through No. two fixed pins (12), back fork (3) and connecting block (10) integrated into one piece.

4. The universal precision acetabular cup pin extractor of claim 1, wherein: the screw-up head (31) is a spiral hexagon.

5. The universal precision acetabular cup pin extractor of claim 1, wherein: connect pole (2) internal one end that lies in to get nail pole (13) to have set gradually a pressure movable block (14), torsion spring (15), No. two pressure movable blocks (16), screw rod (17) with connect pole (2) inner wall spiro union, and one end is worn out and is connect outside pole (2), screw rod (17) are worn out and are connect pole (2) outer one end and handle (1) through pin fixed connection, a pressure movable block (14) with get nail pole (13) and take off tooth (18) through slipping and connect.

6. The universal precision acetabular cup pin extractor of claim 1, wherein: the side walls of the connecting rod (2) and the nail taking rod (13) are provided with stoppers (19).

7. The universal precision acetabular cup pin extractor of claim 1, wherein: connect pole (2) middle part to be provided with and end commentaries on classics piece (20), end commentaries on classics piece (20) inside is provided with bullet arm (21), it is provided with bullet arm groove (22) to connect the outside position that corresponds with bullet arm (21) of pole (2), the one end that ends commentaries on classics piece (20) is close handle (1) is inside to be provided with and ends commentaries on classics strip (23), handle (1) and the position that ends commentaries on classics strip (23) and correspond are provided with and end commentaries on classics recess (24).

8. The universal precision acetabular cup pin extractor of claim 5, wherein: get and still connect through elasticity roof beam (25) between nail pole (13) and a pressure movable block (14), one side that lies in getting nail pole (13) on elasticity roof beam (25) is provided with foil gage (26) No. one, one side that lies in pressure movable block (14) on elasticity roof beam (25) is provided with foil gage (27) No. two, it is provided with display screen (28) to connect pole (2) outside, foil gage (26), foil gage (27) and display screen (28) electric connection No. one.