CN220360454U - Hollow bone screw for intramedullary fixation - Google Patents
Hollow bone screw for intramedullary fixation Download PDFInfo
- Publication number
- CN220360454U CN220360454U CN202320467251.5U CN202320467251U CN220360454U CN 220360454 U CN220360454 U CN 220360454U CN 202320467251 U CN202320467251 U CN 202320467251U CN 220360454 U CN220360454 U CN 220360454U
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- screw
- cover plate
- hollow
- internal
- groove
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 68
- 238000007789 sealing Methods 0.000 claims abstract description 39
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 230000000399 orthopedic effect Effects 0.000 description 3
- 239000007943 implant Substances 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 208000017013 ulna fracture Diseases 0.000 description 1
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- Surgical Instruments (AREA)
Abstract
The utility model discloses a hollow bone screw for intramedullary fixation, which comprises an outer hollow screw and an inner hollow screw, wherein the tail end of the outer hollow screw is connected with a screw sealer, the inner hollow screw is arranged in the outer hollow screw, and an inner screw rotating device is arranged in the inner hollow screw. According to the utility model, the adjustable hollow bone screw is designed, the length of the whole bone screw can be adjusted to meet the requirements of bones with different sizes, so that the adaptability of the bone screw is greatly improved, besides, the bone screw is designed into a hollow form, the sealing head at the top end of the internal screw rotating device is designed to effectively seal the hollow cavity of the screw, annular cutting is not caused to the inside of the bone when the bone screw is embedded, and the screw cap is designed to be openable, so that the rotation and screwing of the internal screw are facilitated, and the convenience of bone screw insertion is increased.
Description
Technical Field
The utility model designs a hollow bone screw, belongs to the technical field of medical instruments, and particularly relates to a hollow bone screw for intramedullary fixation.
Background
Bone screws are implants used in orthopedic treatment, often in combination with bone plates and other orthopedic instruments for internal fixation. Internal fixation using bone screws was traced back to the 19 th century. In 1850, two bone screws were used for the first time to achieve fixation of olecranon fractures. In 1886, the steel plate screw system was used for the first time to achieve subcutaneous fixation of fractures. At present, bone screws are widely used as an effective implant in orthopedic internal fixation. Screws, after implantation into the human body, are typically subjected to a combination of bending, tensile and shear stresses.
The traditional bone screw is solid, the main component of the bone screw is polylactic acid which can be decomposed and absorbed by human body, but the bone screw is difficult to be suitable for the correction of bones with different sizes only by one size, so that the bone screw with adjustable size can be designed.
Disclosure of Invention
The utility model aims to provide a hollow bone screw for intramedullary fixation, which is different from the traditional bone screw with single fixed shape and size, is designed into an adjustable telescopic hollow bone screw, an internal hollow screw is also sleeved in the external hollow screw in a threaded manner, and the internal hollow screw can be rotationally moved through an internal screw rotating device, so that the length of the whole bone screw is adjusted to meet the bone-saving requirements of bones with different sizes, the adaptability of the bone screw is greatly improved, in addition, the bone screw is designed into a hollow form for reducing the damage to bone tissues and the pain to patients caused by the bone screw when the bone screw is embedded, the hollow cavity of the screw can be effectively sealed by designing a sealing head at the top end of the internal screw rotating device, the annular cutting of the bone is not caused when the bone screw is embedded, and the screw cap of the whole bone screw is designed to be openable, so that the screw driver can be used for rotationally screwing the internal screw, and the convenience of bone screw insertion is increased.
The hollow bone screw for intramedullary fixation comprises an external hollow screw and an internal hollow screw, wherein the tail end of the external hollow screw is connected with a screw sealer, the internal hollow screw is arranged in the external hollow screw, and an internal screw rotating device is arranged in the internal hollow screw.
Preferably, the screw sealer comprises a sealing cover plate, a cover plate cross groove is formed in the surface of the sealing cover plate, a cover plate fixing button is arranged at the lower end of the sealing cover plate, the upper end of the sealing cover plate is connected with a hinge, and the hinge is connected with a reset spring.
Preferably, the external hollow screw comprises an external screw cylinder and a sealing cover plate connecting groove, the upper end and the lower end of the tail part of the external screw cylinder are respectively provided with the sealing cover plate connecting groove, the periphery of the external screw cylinder is provided with external screw threads, the inner wall of the external screw cylinder is provided with internal screw threads, the inner wall of the external screw cylinder is provided with a positioning device clamping groove, the positioning device clamping groove is used for fixing the internal hollow screw positioning device, the upper end of the sealing cover plate connecting groove is fixedly connected with a hinge and a reset spring, the lower end of the sealing cover plate connecting groove is provided with a button fixing block, and the button fixing block is fixedly connected with a cover plate fixing button.
Preferably, the internal hollow screw comprises an internal screw cylinder, external threads of the internal screw are arranged on the periphery of the internal screw cylinder, a connecting block is arranged at the tail part of the internal screw cylinder, a small round hole is formed in the top end of the internal screw cylinder, and a positioning device containing inner grooves are formed in the upper end and the lower end, close to the tail part, of the internal screw cylinder.
Preferably, the internal screw rotating device comprises a rotating rod main shaft and a connecting disc, the top end of the rotating rod main shaft is connected with an internal screw sealing head, the internal screw sealing head is fixedly connected with a small round hole, the tail end of the rotating rod main shaft is provided with the connecting disc, the outer surface of the connecting disc is provided with a cross groove of the connecting disc, the inner surface of the connecting disc is provided with a connecting block connecting groove, and the connecting block connecting groove is fixedly connected with a connecting block.
Preferably, the internal hollow screw positioning device comprises a wedge block, a connecting spring is arranged at one end of the parallel surface of the wedge block, a supporting bar is arranged at one side of the parallel surface of the wedge block, the supporting bar penetrates through the connecting rotating shaft, and the supporting bar is arranged on the bottom surface of the inner groove accommodated by the positioning device.
Compared with the prior art, the utility model has the advantages that:
1) In the utility model, unlike the traditional bone screw with single fixed shape and size, the adjustable telescopic hollow bone screw is designed, the internal hollow screw is sleeved and embedded in the external hollow screw in a threaded manner, and the internal hollow screw can be rotated and moved through the internal screw rotating device, so that the length of the whole bone screw is adjusted to adapt to the bone-saving requirements of bones with different sizes, and the adaptability of the bone screw is greatly improved.
2) In the utility model, in order to reduce the damage to bone tissues and the pain caused to patients when the bone screw is embedded, the bone screw is designed into a hollow form, the sealing head at the top end of the internal screw rotating device is designed to effectively seal the hollow cavity of the screw, so that the annular cutting of the bone is not caused when the bone screw is embedded, and the screw cap of the whole bone screw is designed to be openable, thereby facilitating the rotation and screwing of the internal screw by a screw driver and improving the convenience of bone screw access.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is an enlarged schematic view of the structure of the external hollow screw of the present utility model;
FIG. 3 is an enlarged schematic view of the structure of the screw sealer of the utility model;
FIG. 4 is an enlarged schematic view of the structure of the hollow screw and its turning device according to the present utility model;
fig. 5 is an enlarged schematic view of the structure of the internal hollow screw positioning device of the present utility model.
The reference numerals in the figures illustrate: 1. a screw sealer; 101. a sealing cover plate; 102. a cover plate cross groove; 103. a cover plate fixing button; 104. a hinge; 105. a return spring; 2. an outer hollow screw; 201. an outer screw barrel; 202. external threads of the external screw; 203. an external screw is internally provided with threads; 204. a positioning device clamping groove; 205. a sealing cover plate connecting groove; 206. a button fixing block; 3. an internal hollow screw; 301. an inner screw barrel; 302. external threads of the internal screw; 303. a joint block; 304. a small round hole; 305. the positioning device accommodates the inner groove; 4. an internal screw rotation device; 401. a rotating rod main shaft; 402. an inner screw sealing head; 403. joining the wafers; 404. a cross groove of the wafer is connected; 405. a connecting block connecting groove; 5. an internal hollow screw positioning device; 501. wedge blocks; 502. a connecting spring; 503. a support bar; 504. a rotating shaft.
Detailed Description
Examples: referring to fig. 1-5, a hollow bone screw for intramedullary fixation includes an outer hollow screw 2 and an inner hollow screw 3, wherein the tail end of the outer hollow screw 2 is connected with a screw sealer 1, the inner hollow screw 3 is installed inside the outer hollow screw 2, an inner screw rotating device 4 is arranged inside the inner hollow screw 3, the inner screw rotating device 4 is movably connected in the inner hollow screw 3, the inner hollow screw 3 can be driven to rotate by combining a tail end connecting block connecting groove 405 with a connecting block 303, so that the inner hollow screw 3 can rotate and adjust displacement along an inner screw built-in thread 203 inside the outer hollow screw 2, the length of the whole bone screw can be changed once, and the screw sealer 1 is designed to be openable and closable so as not to break the sealing performance of a sealing cover when the inner screw rotating device 4 is rotated by a screwdriver, so that bacteria can enter into bones from the hollow cavity of the bone screw, as long as a cover plate fixing button 103 is pressed, the cover plate 101 can be opened, and the cover plate fixing button 103 can be pressed into a button fixing block 206 when closed.
In this embodiment, the screw sealer 1 includes a sealing cover plate 101, a cover plate cross groove 102 is formed on the surface of the sealing cover plate 101, a cover plate fixing button 103 is arranged at the lower end of the sealing cover plate 101, a hinge 104 is connected to the upper end of the sealing cover plate 101, a reset spring 105 is connected to the hinge 104, the sealing cover plate 101 moves along the hinge 104 to rotate and open, and the reset spring 105 can limit the opening and closing angle of the sealing cover plate 101, so that the opening and closing angle is prevented from being too large to break and damage.
In this embodiment, the external hollow screw 2 includes an external screw barrel 201 and a cover plate connecting groove 205, the upper and lower ends of the tail of the external screw barrel 201 are respectively provided with the cover plate connecting groove 205, the periphery of the external screw barrel 201 is provided with external screw threads 202, the inner wall of the external screw barrel 201 is provided with internal screw threads 203, and the inner wall of the external screw barrel 201 is provided with a positioning device clamping groove 204, the positioning device clamping groove 204 is used for fixing the internal hollow screw positioning device 5, the upper end of the cover plate connecting groove 205 is fixedly connected with the hinge 104 and the return spring 105, the lower end of the cover plate connecting groove 205 is provided with a button fixing block 206, the button fixing block 206 is fixedly connected with the cover plate fixing button 103, the cover plate connecting groove 205 is used for connecting and fixing the cover plate 101, the external screw threads 202 can help the external hollow screw 2 to be embedded into bones more easily, and the external screw internal screw threads 203 are combined with external screw threads 302 arranged on the periphery of the internal screw barrel 301, and the positioning device clamping groove 204 is used for fixing the internal screw barrel 301.
In this embodiment, the internal hollow screw 3 includes an internal screw cylinder 301, an external screw thread 302 is disposed on the periphery of the internal screw cylinder 301, a connecting block 303 is disposed at the tail of the internal screw cylinder 301, a small round hole 304 is formed at the top end of the internal screw cylinder 301, a positioning device accommodating inner groove 305 is formed at the upper end and the lower end of the internal screw cylinder 301 near the tail, the connecting block 303 and the connecting block connecting groove 405 are combined to fixedly connect the internal screw cylinder 301 and the rotating rod spindle 401, and the radius of the small round hole 304 is smaller than that of the hollow inner cavity of the internal screw cylinder 301, so as to limit the rotating rod spindle 401 to exceed the internal screw cylinder 301, and the internal screw cylinder 301 is fixed.
In this embodiment, the internal screw rotating device 4 includes a rotating rod main shaft 401 and a linking disc 403, the top end of the rotating rod main shaft 401 is connected with an internal screw sealing head 402, the internal screw sealing head 402 is fixedly connected with a small round hole 304, the tail end of the rotating rod main shaft 401 is provided with a linking disc 403, the outer surface of the linking disc 403 is provided with a linking disc cross slot 404, the inner surface of the linking disc 403 is provided with a linking block connecting slot 405, the linking block connecting slot 405 is fixedly connected with a linking block 303, the linking disc cross slot 404 is beneficial to the rotation of a screwdriver to drive the rotating rod main shaft 401, and the internal screw sealing head 402 can be just connected into the small round hole 304.
In this embodiment, the internal hollow screw positioning device 5 includes a wedge block 501, one end of the parallel surface of the wedge block 501 is provided with a connecting spring 502, one side of the parallel surface of the wedge block 501 is provided with a supporting bar 503, the supporting bar 503 penetrates through the connecting rotating shaft 504, and the supporting bar 503 is installed on the bottom surface of the internal groove 305 of the positioning device accommodating device, when the internal screw cylinder 301 has not moved to the front end of the external hollow screw 2, the wedge block 501 is retracted in the internal groove 305 of the positioning device accommodating device under the action of the cylinder wall of the external hollow screw 2, after the internal hollow screw 3 rotates to the front end of the external hollow screw 2, the wedge block 501 stretches out towards two ends under the action of the elasticity of the connecting spring 502, and at this time, the wedge block 501 can be just clamped in the clamping groove 204 of the positioning device to realize the extension fixation of the internal hollow screw 3.
In this embodiment, the specific working procedure of bone screw adjustment is that firstly, the length of the screw to be used is determined according to the bone size to be fractured, if the outer hollow screw 2 is used, the top end of the inner hollow screw 3 is kept to be level with the top end of the outer hollow screw 2, the inner screw rotating device 4 is extended into the inner cavity of the inner hollow screw 3 until the inner hollow screw 3 is completely extended from the small round hole 304, then the cover plate fixing button 103 is pressed to enter the combination button fixing block 206, the cover plate 101 is closed, the cover plate cross slot 102 is aligned by using a screwdriver, the outer hollow screw 2 is rotated to smoothly enter the bone to be connected, and then the cover plate 101 is opened to rotate and take out the inner hollow screw 3; if the internal hollow screw 3 is needed for bone setting, the main shaft 401 of the rotating rod is firstly extended to combine the connecting block connecting groove 405 with the connecting block 303, the external hollow screw 2 is firstly rotated by a screwdriver to be firstly penetrated into the deep part of the bone, then the sealing cover plate 101 is opened, the cross groove 404 of the connecting disc is aligned by the screwdriver, the internal screw rotating device 4 is rotated to drive the internal hollow screw 3 to rotate and extend out of the external screw barrel 201 until the internal hollow screw 3 rotates to the front end of the external hollow screw 2, the wedge block 501 is extended to two ends under the elastic force of the connecting spring 502, the wedge block 501 is just clamped in the clamping groove 204 of the positioning device to realize the extension and fixation of the internal hollow screw 3, at the moment, the internal hollow screw 3 is also extended and positioned in the bone, and finally the internal screw rotating device 4 is taken out to close the sealing cover plate 101 to finish the embedding of the bone setting screw.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (6)
1. A cannulated bone screw for intramedullary fixation comprising an outer cannulated screw (2) and an inner cannulated screw (3), characterized in that: the tail end of the outer hollow screw (2) is connected with the screw sealer (1), the inner hollow screw (3) is arranged in the outer hollow screw (2), and an inner screw rotating device (4) is arranged in the inner hollow screw (3).
2. A cannulated bone screw for intramedullary fixation according to claim 1, wherein: the screw sealer (1) comprises a sealing cover plate (101), a cover plate cross groove (102) is formed in the surface of the sealing cover plate (101), a cover plate fixing button (103) is arranged at the lower end of the sealing cover plate (101), a hinge (104) is connected with the upper end of the sealing cover plate (101), and a reset spring (105) is connected with the hinge (104).
3. A cannulated bone screw for intramedullary fixation according to claim 1, wherein: the outer hollow screw (2) comprises an outer screw cylinder (201) and a sealing cover plate connecting groove (205), the upper end and the lower end of the tail of the outer screw cylinder (201) are respectively provided with the sealing cover plate connecting groove (205), the periphery of the outer screw cylinder (201) is provided with an outer screw external thread (202), the inner wall of the outer screw cylinder (201) is provided with an outer screw internal thread (203), the inner wall of the outer screw cylinder (201) is provided with a positioning device clamping groove (204), the positioning device clamping groove (204) is used for fixing the inner hollow screw positioning device (5), the upper end of the sealing cover plate connecting groove (205) is fixedly connected with a hinge (104) and a reset spring (105), the lower end of the sealing cover plate connecting groove (205) is provided with a button fixing block (206), and the button fixing block (206) is fixedly connected with a cover plate fixing button (103).
4. A cannulated bone screw for intramedullary fixation according to claim 1, wherein: the inside hollow screw (3) comprises an inside screw cylinder (301), an outside screw thread (302) is arranged on the periphery of the inside screw cylinder (301), a connecting block (303) is arranged at the tail of the inside screw cylinder (301), a small round hole (304) is formed in the top end of the inside screw cylinder (301), and a locating device containing inner groove (305) is formed in the upper end and the lower end, close to the tail, of the inside screw cylinder (301).
5. A cannulated bone screw for intramedullary fixation according to claim 1, wherein: the internal screw rotating device (4) comprises a rotating rod main shaft (401) and a connecting disc (403), the top end of the rotating rod main shaft (401) is connected with an internal screw sealing head (402), the internal screw sealing head (402) is fixedly connected with a small round hole (304), the tail end of the rotating rod main shaft (401) is provided with the connecting disc (403), the outer surface of the connecting disc (403) is provided with a connecting disc cross groove (404), the inner surface of the connecting disc (403) is provided with a connecting block connecting groove (405), and the connecting block connecting groove (405) is fixedly connected with a connecting block (303).
6. A cannulated bone screw for intramedullary fixation according to claim 3, wherein: the inside cavity screw positioner (5) include wedge (501), wedge (501) parallel surface one end sets up connecting spring (502), wedge (501) parallel surface one side sets up support bar (503), support bar (503) through connection pivot (504), just support bar (503) install and hold inside groove (305) bottom surface at positioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320467251.5U CN220360454U (en) | 2023-03-13 | 2023-03-13 | Hollow bone screw for intramedullary fixation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320467251.5U CN220360454U (en) | 2023-03-13 | 2023-03-13 | Hollow bone screw for intramedullary fixation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220360454U true CN220360454U (en) | 2024-01-19 |
Family
ID=89519789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320467251.5U Active CN220360454U (en) | 2023-03-13 | 2023-03-13 | Hollow bone screw for intramedullary fixation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220360454U (en) |
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2023
- 2023-03-13 CN CN202320467251.5U patent/CN220360454U/en active Active
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