CN210095890U - Umbrella-shaped bone screw bolt convenient to disassemble - Google Patents
Umbrella-shaped bone screw bolt convenient to disassemble Download PDFInfo
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- CN210095890U CN210095890U CN201920429014.3U CN201920429014U CN210095890U CN 210095890 U CN210095890 U CN 210095890U CN 201920429014 U CN201920429014 U CN 201920429014U CN 210095890 U CN210095890 U CN 210095890U
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims description 27
- 206010020649 Hyperkeratosis Diseases 0.000 claims description 4
- 230000006378 damage Effects 0.000 abstract description 8
- 230000035876 healing Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 9
- 230000001154 acute effect Effects 0.000 description 3
- 210000002436 femur neck Anatomy 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 210000000689 upper leg Anatomy 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 208000020089 femoral neck fracture Diseases 0.000 description 2
- 230000012010 growth Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000008468 bone growth Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 210000004394 hip joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000017074 necrotic cell death Effects 0.000 description 1
- 238000004393 prognosis Methods 0.000 description 1
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Abstract
The umbrella-shaped bone screw bolt convenient to disassemble comprises a screw bolt body, the screw bolt body comprises a screw head and a hollow screw body, the hollow screw body comprises a polished rod part, at least two screw thread umbrella pieces and a soft connecting piece matched with the screw thread umbrella pieces in quantity, each screw thread umbrella piece is uniformly arranged along the circumferential direction of the polished rod part, and each thread umbrella piece is connected with the end edge of the polished rod through a soft connecting piece, an annular groove is formed at the periphery of the soft connecting piece, a mandrel used for driving the inner wall of each thread umbrella piece to be kept in a straight state after being stressed is inserted into the hollow cavity of the hollow screw body, a pre-shrinking piece used for driving the end wall of each thread umbrella piece to be kept in a straight state after being stressed is arranged in the annular groove, a precession operation cavity used for stressing when the bolt body is screwed in is arranged at the end part of the screw head, the precession operation cavity is communicated with the hollow cavity of the hollow screw body, and a drawing step used for withdrawing the bolt body is arranged at one. The bone screw bolt has the advantages of simple and reliable structure, convenient operation, avoiding operation damage and improving healing progress.
Description
Technical Field
The utility model relates to a medical auxiliary instrument, in particular to an umbrella-shaped bone bolt which is convenient to disassemble.
Background
The femoral neck fracture is usually fixed by three sharp hexagonal hollow screws, the materials of the three sharp hexagonal hollow screws are usually titanium alloy, and the front parts of the screws are provided with cancellous threads, so that the threads are thicker, and the holding force is higher. And the screw is generally not tapped during the operation, so that a sharp hexagonal smooth thread is often generated. When the cannulated screw needs to be taken out after operation (for example, femoral head necrosis after femoral neck fracture and hip joint replacement or femoral head protection treatment needs to be carried out again), the cannulated screw needs to be screwed out by an acute hexagonal screwdriver, the holding force in the femoral head is large due to the thick thread at the front part of the screw, and the acute hexagonal hole of the cannulated screw is easy to have an acute hexagonal slide thread under the condition of the existing slide thread at the early stage. Once the screw is slipped, due to the lack of an effective hollow screw extractor, the screw is hopefully extracted by drilling with a vice or an electric drill, the operation is time-consuming, the damage to the femoral neck and the femur is large, and the operation progress and the operation prognosis are seriously influenced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome the not enough of prior art, provide a simple structure reliable, convenient operation, can avoid the operation damage, can improve the easy-to-detach umbelliform bone bolt of healing progress.
In order to solve the technical problem, the utility model discloses a following technical scheme:
an umbrella-shaped bone screw bolt convenient to disassemble comprises a screw bolt body, wherein the screw bolt body comprises a screw head and a hollow screw body, the hollow screw body comprises a polished rod part, at least two thread umbrella pieces and soft connecting pieces matched with the thread umbrella pieces in quantity, the thread umbrella pieces are uniformly arranged along the circumferential direction of the polished rod part and are connected with the end edge of the polished rod through the soft connecting pieces, an annular groove is formed at the periphery of the soft connecting piece, a mandrel used for driving the inner wall of the spiral umbrella piece to keep a straight state after being stressed is inserted in the hollow cavity of the hollow spiral body, a pre-shrinking piece for driving the end wall of the threaded umbrella piece to keep a straight state after being stressed is arranged in the ring groove, the screw head end portion is provided with a screwing operation cavity used for bearing force when the bolt body is screwed in, the screwing operation cavity is communicated with a hollow cavity of the hollow screw body, and one end, close to the hollow screw body, of the screw head is provided with a drawing step used for withdrawing the bolt body.
As a further improvement of the above technical solution:
the pre-shrinking piece comprises a pre-shrinking hoop and a degradable gasket, the pre-shrinking hoop and the degradable gasket are hooped in the annular groove, and the degradable gasket is located between the pre-shrinking hoop and the soft connecting sheet.
The aperture of the precession operation cavity is larger than the aperture of the hollow cavity of the hollow screw body.
The precession operation cavity is provided with a regular polygon cavity structure.
And the end part of each threaded umbrella piece is provided with a positioning table, and the mandrel is inserted into the hollow cavity and is tightly attached to the positioning tables in a matching way.
Also included is an obturating assembly for preventing callus growth into the precession operating cavity.
The cavity sealing assembly comprises a cover body and an elastic cavity sealing pad, the elastic cavity sealing pad is sleeved in a hollow cavity of the hollow screw body, and the cover body covers the cavity opening of the screw head.
The cover body is provided with a push-pull rod which extends into the screwing operation cavity and is fastened with the elastic sealing cavity pad, the push-pull rod is provided with a fastening head, the mandrel is provided with a fastening platform, and two ends of the elastic sealing cavity pad are provided with inner expanding fastening grooves matched with the fastening head and the fastening platform.
The cover body is provided with a nut, the nut is in threaded fit with the screw head, and a gap is formed between the nut and the screw head in the axial direction in the threaded fit.
The periphery of lid is equipped with the ka tai, the precession operation chamber of spiral shell head is equipped with L type draw-in groove in accent department, the ka tai along the vertical entering of L type draw-in groove and the horizontal groove joint of rotation angle back with L type draw-in groove.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses an umbelliform bone bolt convenient to dismantle, during the use, insert the dabber along the cavity of cavity spiral shell body, the straight state is kept after the atress of screw thread umbrella piece inner wall, and then hoop the shrink-in piece in the annular tightly, and the straight form is kept after the atress of screw thread umbrella piece end wall, has formed the location to the screw thread umbrella piece through inside and outside atress like this, then utilizes the instrument to extend the precession operation chamber and carries out the rotation operation, makes the screw thread umbrella piece precession reach the coaptation effect; when the bone screw bolt is required to be taken out, the mandrel is taken out firstly, the threaded umbrella piece is supported and eliminated by the inner wall of the threaded umbrella piece due to the pre-shrinkage force of the pre-shrinkage piece, so that the threaded umbrella piece can move towards the radial direction, the effect of actively unloading the thread tight fit force is achieved, and the bone screw bolt can be slowly pulled out by applying pulling force to the pulling step in the axial direction through a tool subsequently. Compared with the traditional structure, the bone screw bolt keeps the thread umbrella piece in a straight shape by utilizing the internal and external matching of the mandrel and the pre-shrinking piece when screwing in, the mandrel also provides rigidity to ensure the screwing strength, even if the screwing operation cavity has stress damage and slip phenomena when in bone fracture, the bone screw bolt can be taken out by actively unloading the thread tight fitting force when being taken out, and the bone screw bolt is drilled by a vice or an electric drill, so the structure is simple and the operation is convenient; on one hand, the operation time is saved; on the other hand, the femoral neck and the femur cannot be damaged when the femoral head is taken out, so that the injury prevention effect is achieved, and the operation progress and the healing progress are improved.
Drawings
Fig. 1 is a schematic front view of embodiment 1 of the present invention.
Fig. 2 is a schematic main sectional structure diagram of embodiment 1 of the present invention.
Fig. 3 is a schematic cross-sectional structure view of the bolt body in embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of a mandrel in embodiment 1 of the present invention.
Fig. 5 is a schematic structural view of a cover in embodiment 1 of the present invention.
Fig. 6 is a schematic structural view of the elastic cavity sealing pad in embodiment 1 of the present invention.
Fig. 7 is a schematic bottom view of fig. 3.
Fig. 8 is a schematic front view of embodiment 2 of the present invention.
Fig. 9 is a main sectional structure diagram of embodiment 2 of the present invention.
Fig. 10 is a schematic cross-sectional view of a bolt body in embodiment 2 of the present invention.
Fig. 11 is a schematic structural view of a cover in embodiment 2 of the present invention.
Fig. 12 is a schematic bottom view of the structure of fig. 10.
The reference numerals in the figures denote:
1. a bolt body; 11. a screw head; 111. screwing into the operating cavity; 1111. an L-shaped clamping groove; 112. drawing a step; 12. a hollow screw body; 121. a light bar section; 122. a thread umbrella piece; 1221. a positioning table; 123. a soft connecting sheet; 124. a ring groove; 2. a mandrel; 21. buckling a platform; 3. a pre-shrinking member; 31. pre-shrinking the hoop; 32. a degradable gasket; 4. a cavity sealing component; 41. a cover body; 411. clamping a platform; 42. an elastic cavity sealing pad; 421. an inner expanding buckle slot; 43. a push-pull rod; 431. and (6) buckling a head.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific examples.
Example 1:
fig. 1 to 7 show a first embodiment of an umbrella-shaped bone screw bolt convenient for disassembly according to the present invention, which comprises a bolt body 1, wherein the bolt body 1 comprises a screw head 11 and a hollow screw body 12, the hollow screw body 12 comprises a polished rod portion 121, at least two pieces of umbrella blades 122 and soft connecting pieces 123 with the number matching with the number of the umbrella blades 122, each umbrella blade 122 is uniformly arranged along the circumference of the polished rod portion 121, each umbrella blade 122 is connected with the end edge of the polished rod portion 121 through the soft connecting pieces 123, a ring groove 124 is formed on the periphery of the soft connecting pieces 123, a mandrel 2 for driving the inner wall of the umbrella blade 122 to keep straight after being stressed is inserted into a hollow cavity of the hollow screw body 12, a pre-shrinking member 3 for driving the end wall of the umbrella blade 122 to keep straight after being stressed is arranged in the ring groove 124, a precession operation cavity 111 for being stressed when the bolt body 1 is screwed in is arranged at the end portion of the screw head 11, the precession operation cavity 111 is communicated, one end of the screw head 11 close to the hollow screw body 12 is provided with a drawing step 112 for withdrawing the bolt body 1. When the bone-knitting machine is used, the mandrel 2 is inserted along the hollow cavity of the hollow screw body 12, the inner wall of the threaded umbrella piece 122 keeps in a straight state after being stressed, the pre-shrinking piece 3 is tightly hooped in the annular groove 124, and the end wall of the threaded umbrella piece 122 keeps in a straight state after being stressed, so that the threaded umbrella piece 122 is positioned through internal and external stress, and then a tool is extended to the screwing operation cavity 111 for rotating operation, so that the threaded umbrella piece 122 is screwed in to achieve the bone-knitting effect; when the bone bolt needs to be taken out, the mandrel 2 is taken out firstly, the threaded umbrella piece 122 is supported and eliminated by the inner wall of the threaded umbrella piece 122 due to the pre-shrinkage force of the pre-shrinkage part 3, so that the threaded umbrella piece 122 can move in the radial direction, the effect of actively unloading the thread tight fit force is achieved, and the bone bolt can be pulled out slowly by applying a pulling force to the pulling step 112 in the axial direction through a tool subsequently. Compared with the traditional structure, the bone screw bolt keeps the straight shape of the threaded umbrella piece 122 by utilizing the internal and external matching of the mandrel 2 and the pre-shrinking piece 3 when screwing in, the mandrel 2 also provides rigidity to ensure the screwing strength, even if the screwing operation cavity 111 has stress damage and slipping phenomena when bone is connected, the bone screw bolt can be taken out by actively unloading the thread tight fit force when taken out, and the bone screw bolt is drilled by a vice or an electric drill, so that the structure is simple and the operation is convenient; on one hand, the operation time is saved; on the other hand, the femoral neck and the femur cannot be damaged when the femoral head is taken out, so that the injury prevention effect is achieved, and the operation progress and the healing progress are improved.
In this embodiment, the pre-shrinking member 3 includes a pre-shrinking hoop 31 and a degradable gasket 32, both the pre-shrinking hoop 31 and the degradable gasket 32 are hooped in the ring groove 124, and the degradable gasket 32 is located between the pre-shrinking hoop 31 and the soft connecting piece 123. In this structure, degradable packing ring 32 provides an outside resistance to pre-shrinking hoop 31 in earlier stage, and after degradable packing ring 32 degrades, this outside resistance disappears, and the shrink space of pre-shrinking hoop 31 is just bigger after dabber 2 takes out, and the contractility that forms promptly is just also bigger to guarantee that screw thread umbrella piece 122 can remove to radial direction, thereby reach the effect of initiative uninstallation screw thread tight-fitting power.
In this embodiment, the aperture of the screwing operation cavity 111 is larger than the hollow cavity aperture of the hollow screw body 12. In this structure, set up like this and make well cavity and precession operation chamber 111 form the step, with well cavity and precession operation chamber 111 independent division, when the precession operation, can not cause destruction to the cavity, reliability when having guaranteed 2 dismouting of dabber.
In this embodiment, the precession operation chamber 111 is provided with a regular polygonal chamber structure. The screw is a regular hexagonal cavity, and can avoid over-operation as much as possible under the condition of ensuring normal screwing force.
In this embodiment, a positioning platform 1221 is disposed at an end of each threaded umbrella piece 122, and the mandrel 2 is inserted into the hollow cavity and tightly attached to the positioning platform 1221. This positioning platform 1221 can form an axial stop for the mandrel 2, preventing axial displacement of the mandrel 2.
In this embodiment, a cavity sealing assembly 4 is also included for preventing callus growth into the precession operating cavity 111. In this structure, after the screw-in operation of bone bolt was accomplished, utilize and seal chamber subassembly 4 to realize the shutoff to screw-in operation chamber 111 to callus on the earth grows to screw-in operation chamber 111 in when preventing the bone growth, play the effect in the protection cavity on the one hand, on the other hand can further improve and take out the effect.
In this embodiment, the cavity sealing assembly 4 includes a cover 41 and an elastic cavity sealing pad 42, the elastic cavity sealing pad 42 is sleeved in the hollow cavity of the hollow screw body 12, and the cover 41 covers the opening of the screw head 11. In the structure, the elastic cavity sealing pad 24 plays a role in filling and protecting the cavity, and the cover body 41 plays a role in sealing the opening of the screw head 11, so that the sealing function is achieved through secondary protection.
In this embodiment, the cover 41 is provided with a push-pull rod 43 extending into the screwing operation cavity 111 and fastened to the elastic cavity sealing pad 42, the push-pull rod 43 is provided with a fastening head 431, the mandrel 2 is provided with a fastening platform 21, and two ends of the elastic cavity sealing pad 42 are provided with inner expanding fastening grooves 421 matched with the fastening head 431 and the fastening platform 21. In the structure, the push-pull rod 23 is buckled with the inner expanding buckling groove 421 at one end through the buckling head 431, the mandrel 2 is buckled with the inner expanding buckling groove 421 at the other end through the buckling table 21, when the structure is installed, the push-pull rod 43 pushes against the elastic cavity sealing pad 42, and the reverse elasticity of the elastic cavity sealing pad 42 drives the cover body 41 to form tight connection with the cavity opening of the screw head 11; when the cover 41 is subsequently taken out, the push-pull rod 43 brings out the elastic cavity sealing pad 42 and the mandrel 2, so that the convenience of disassembly and assembly is improved.
In this embodiment, the cover 41 is configured as a nut, the nut is in threaded fit with the screw head 11, and the nut is in threaded fit with the screw head 11 with a gap in the axial direction. In this structure, the nut is in threaded fit with the screw head 11, but the fit is a clearance fit, that is, the nut and the screw head 11 do not form a final fastening force when in threaded fit, the final fastening force drives the nut to be axially attached to the screw thread of the screw head 11 by the reverse elasticity of the elastic cavity sealing pad 42, and the arrangement is also to ensure the convenience of screwing out the cover 41.
Example 2:
fig. 8 to 12 show a second embodiment of the umbrella-shaped bone screw according to the present invention, which is substantially the same as embodiment 1 except that: in this embodiment, a clamping table 411 is disposed on the periphery of the cover 41, an L-shaped clamping groove 1111 is disposed at the cavity opening of the screwing operation cavity 111 of the screw head 11, and the clamping table 411 enters along the vertical direction of the L-shaped clamping groove 1111 and is clamped with the transverse groove of the L-shaped clamping groove 1111 after rotating by an angle. In this structure, when the card holder 411 is installed, the cover body 41 is pressed to make the card holder 411 enter along the vertical direction of the L-shaped slot 1111, and then the card holder 411 is clamped with the transverse slot of the L-shaped slot 1111 by a rotation angle; the cover 41 is reversely operated when being subsequently taken out, and the convenience of disassembly and assembly is also improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides an umbelliform bone bolt just dismantles, includes bolt body (1), bolt body (1) is including spiral shell head (11) and hollow spiral shell body (12), its characterized in that: the hollow screw body (12) comprises a smooth rod part (121), at least two thread umbrella pieces (122) and soft connecting pieces (123) matched with the thread umbrella pieces (122) in quantity, each thread umbrella piece (122) is uniformly arranged along the circumference of the smooth rod part (121), each thread umbrella piece (122) is connected with the end edge of the smooth rod part (121) through the soft connecting pieces (123), an annular groove (124) is formed in the periphery of the soft connecting pieces (123), a mandrel (2) used for driving the inner wall of each thread umbrella piece (122) to keep a straight state after being stressed is inserted into a hollow cavity of the hollow screw body (12), a pre-shrinking piece (3) used for driving the end wall of each thread umbrella piece (122) to keep a straight state after being stressed is arranged in the hollow cavity, a precession operation cavity (111) used for stress when the bolt body (1) is screwed in is arranged at the end part of the screw head (11), and the precession operation cavity (111) is communicated with the hollow cavity of the hollow screw body (12), one end of the screw head (11) close to the hollow screw body (12) is provided with a drawing step (112) for the bolt body (1) to withdraw.
2. The umbrella bone bolt of claim 1, wherein: the pre-shrinking part (3) comprises a pre-shrinking hoop (31) and a degradable gasket (32), the pre-shrinking hoop (31) and the degradable gasket (32) are hooped in the annular groove (124), and the degradable gasket (32) is located between the pre-shrinking hoop (31) and the soft connecting sheet (123).
3. The detachable umbrella bone bolt according to claim 2, wherein: the aperture of the precession operation cavity (111) is larger than the hollow cavity aperture of the hollow screw body (12).
4. An umbrella bone bolt for easy removal according to claim 3, wherein: the screw-in operation cavity (111) is provided with a regular polygonal cavity structure.
5. The umbrella bone bolt of claim 4 that is easy to remove, wherein: each threaded umbrella piece (122) end is provided with a positioning platform (1221), and the mandrel (2) is inserted into the hollow cavity and is tightly attached to the positioning platform (1221) in a matching manner.
6. The detachable umbrella bone bolt according to any one of claims 1 to 5, characterized in that: also comprises a cavity sealing component (4) for preventing callus from growing inwards the screwing operation cavity (111).
7. The detachable umbrella bone bolt according to claim 6, wherein: the cavity sealing assembly (4) comprises a cover body (41) and an elastic cavity sealing pad (42), the elastic cavity sealing pad (42) is sleeved in the hollow cavity of the hollow screw body (12), and the cover body (41) covers the cavity opening of the screw head (11).
8. The umbrella bone bolt of claim 7 that facilitates removal, wherein: the cover body (41) is provided with a push-pull rod (43) which extends into the screwing operation cavity (111) and is buckled with the elastic sealing cavity pad (42), the push-pull rod (43) is provided with a buckle head (431), the mandrel (2) is provided with a buckle platform (21), and two ends of the elastic sealing cavity pad (42) are provided with inner expanding buckle grooves (421) matched with the buckle head (431) and the buckle platform (21).
9. The umbrella bone bolt of claim 8, wherein: the cover body (41) is arranged to be a nut, the nut is in threaded fit with the screw head (11), and a gap is formed between the nut and the screw head (11) in the axial direction in a threaded fit mode.
10. The detachable umbrella bone bolt according to claim 9, wherein: the periphery of lid (41) is equipped with ka tai (411), precession operation chamber (111) of spiral head (11) is equipped with L type draw-in groove (1111) in accent department, card platform (411) follow the vertical entering of L type draw-in groove (1111) and rotate the angle after with the cross slot joint of L type draw-in groove (1111).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920429014.3U CN210095890U (en) | 2019-03-29 | 2019-03-29 | Umbrella-shaped bone screw bolt convenient to disassemble |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920429014.3U CN210095890U (en) | 2019-03-29 | 2019-03-29 | Umbrella-shaped bone screw bolt convenient to disassemble |
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| Publication Number | Publication Date |
|---|---|
| CN210095890U true CN210095890U (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920429014.3U Active CN210095890U (en) | 2019-03-29 | 2019-03-29 | Umbrella-shaped bone screw bolt convenient to disassemble |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210095890U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109938821A (en) * | 2019-03-29 | 2019-06-28 | 中南大学湘雅医院 | Just the umbrella bone blot dismantled |
-
2019
- 2019-03-29 CN CN201920429014.3U patent/CN210095890U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109938821A (en) * | 2019-03-29 | 2019-06-28 | 中南大学湘雅医院 | Just the umbrella bone blot dismantled |
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