CN211534755U - Wedge block screw internal fixing device - Google Patents
Wedge block screw internal fixing device Download PDFInfo
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- CN211534755U CN211534755U CN201922102346.3U CN201922102346U CN211534755U CN 211534755 U CN211534755 U CN 211534755U CN 201922102346 U CN201922102346 U CN 201922102346U CN 211534755 U CN211534755 U CN 211534755U
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Abstract
The utility model discloses a voussoir screw internal fixation device, including lower voussoir screw, go up oblique pipe of voussoir and individualized hone lamella. The lower wedge block screw comprises an inclined cylindrical small screw section and an inclined cylindrical large screw section which are sequentially connected, a cross-shaped groove is formed in the top surface of the inclined cylindrical small screw section, external threads are formed in the outer wall of the inclined cylindrical small screw section, the inclined cylindrical large screw section is provided with an inclined surface, and self-tapping threads are formed in the outer wall of the inclined cylindrical large screw section; a channel is axially arranged in the upper wedge inclined circular tube, a small inclined cylindrical screw section penetrates through the channel of the elliptic cylinder structure and is sleeved in the upper wedge inclined circular tube from bottom to top, the outer diameter of the large inclined cylindrical screw section is equal to that of the upper wedge inclined circular tube, and the inclined angle of the inclined surface of the upper wedge inclined circular tube is equal to that of the inclined surface in the large inclined cylindrical screw section; the personalized bone plate is provided with a thread hole which is provided with an internal thread matched with the small inclined cylindrical screw section. The structure is designed based on the characteristics of human bones, is simple and efficient to install, has short operation time when in use, can be permanently fixed to osteoporosis patients, and is safe and reliable.
Description
Technical Field
The utility model relates to the technical field of medical equipment, in particular to voussoir screw internal fixation device.
Background
The bone is divided into cortical bone and cancellous bone, the cortical bone is also called compact bone, the hard and compact bone is maintained, and the cortical bone is distributed on the surface of the bone to maintain the hard and compact bone; the cancellous bone has bone density lower than that of cortical bone, is spongy, has high elasticity, and is distributed in the bone. Osteoporosis, is a group of bone diseases caused by various reasons, bone tissues have normal calcification, calcium salts and matrixes are in normal proportion, and metabolic bone lesions are characterized by the reduction of the amount of bone tissues in unit volume.
In the case of osteoporosis, the requirements for docking the bone screws may be higher. The existing bone screw clinically applicable to osteoporosis still has the defects that: 1) the size of the existing bone screw is limited by the width of the bone plate, the width of the bone plate is too large to observe the healing condition of the fracture, the insufficient screw can cause the deficiencies of the pullout resistance and the shearing resistance of the bone screw, and particularly, the probability of the fastening failure of the bone screw is higher under the condition of serious osteoporosis; 2) in the prior art, a variable-pitch or variable-outer-diameter bone screw is adopted to fix the osteoporotic bone, but the operation difficulty is high, for a patient with osteoporotic bone, the thin cortical bone bears the main anti-extraction force and friction force of the screw, at the moment, once the stress at the cortical bone is too large, the threaded connection at the cortical bone is possibly failed, and only the cancellous bone bears the anti-extraction force and friction force of the screw, the screw is finally loosened and even broken, and the internal fixation is failed.
Meanwhile, the fracture is the most common and serious complication of osteoporosis, most of the existing fracture internal fixation of the osteoporosis adopts spongy bone screws for fixation, the spongy bone screws are screwed into the bone in the radial direction, so that the contact area between screw teeth and the bone is increased, although the anti-pull-out force and the friction force of the screws are improved to a certain extent, the final anti-pull-out force of the screws is insufficient and the internal fixation fails due to long-term repeated contact extrusion between the screws and the bone. Some of the bone screws are fixed by double-skin bone screws, but secondary damage to soft tissues on the opposite sides of bones is possibly caused by the mode, and complicated operations such as drilling, tapping, nail path treatment, screw screwing and the like are needed in the operation, so that a patient is more easily infected.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a voussoir screw internal fixation device can be used to the internal fixation of osteoporosis and fracture, can make the diameter of voussoir screw not receive the width restriction of individualized hone lamella, has greatly promoted individualized hone lamella and voussoir screw's size design space to make the screw can keep good anti pull-out force and frictional force for a long time in loose bone fixation, to long-term osteoporosis patient, this voussoir screw internal fixation device can be permanent fixed, safe and reliable.
According to the utility model discloses a voussoir screw internal fixation device of embodiment, include:
the lower wedge block screw comprises an inclined cylindrical small screw section and an inclined cylindrical large screw section which are sequentially connected, wherein a cross-shaped groove is formed in the top surface of the inclined cylindrical small screw section, external threads are formed in the outer wall of the inclined cylindrical small screw section, the inclined cylindrical large screw section is provided with an inclined surface, and self-tapping threads are formed in the outer wall of the inclined cylindrical large screw section;
the inclined circular tube is internally provided with a channel along the axial direction, the inclined cylindrical small screw section passes through the channel from bottom to top and is sleeved in the inclined circular tube, so that the lower wedge screw is sleeved with the inclined circular tube, the bottom surface of the inclined circular tube is an inclined surface, and the inclined angle of the bottom surface of the inclined circular tube is equal to that of the inclined surface of the inclined cylindrical large screw section;
the personalized bone plate is provided with a thread hole, and the thread hole is provided with an internal thread matched with the inclined cylindrical small screw section.
According to the utility model discloses voussoir screw internal fixation device has following beneficial effect at least:
the upper wedge inclined circular tube is internally provided with an elliptic cylinder-shaped channel for the inclined cylinder small screw section to pass through, and the lower wedge screw is sleeved with the upper wedge inclined circular tube to realize the sliding of the upper wedge inclined circular tube and the lower wedge screw on the inclined surface; when the lower wedge block screw is fixed, the cross-shaped groove is screwed from bottom to top, so that the lower wedge block screw can drive the inclined circular tube of the upper wedge block to rotate in the screwing direction of the screwdriver, and further drive the lower wedge block screw to move upwards, and meanwhile, self-tapping screw threads in the inclined cylindrical large screw section tap the bone in the direction from bottom to top, so that the lower wedge block screw can keep good anti-extraction force and friction force for a long time in loose bone fixation; the combination of the upper wedge inclined circular tube and the lower wedge screw ensures that the lower wedge screw can be fixed without penetrating through the personalized bone plate like the traditional internal fixation, so that the diameter of the lower wedge screw is not limited by the width of the personalized bone plate, the size design space of the personalized bone plate and the size design space of the screw are greatly improved, the diameter of the lower wedge screw is not limited by the width of the personalized bone plate, and the size design space of the personalized bone plate and the size design space of the wedge screw are greatly improved.
According to the utility model discloses a some embodiments, the voussoir screw is integrated into one piece down, can avoid the connection between oblique cylinder miniscrew section and the oblique cylinder major screw section to appear becoming flexible, strengthens the steadiness.
According to some embodiments of the utility model, the external diameter of the big screw section of oblique cylinder with go up the voussoir and incline the external diameter of pipe and equal.
According to some embodiments of the utility model, still be equipped with the boss on the individualized hone lamella, be equipped with the through-hole on the boss, be equipped with in the through-hole with the same internal thread in thread hole, the through-hole with the thread hole is coaxial, together supplies oblique cylinder miniscrew section to pass through. The individualized bone lamella can be ensured to have enough thread holes to be matched with the small inclined cylindrical screw sections, the whole thickness of the individualized bone lamella is not influenced after fixation, and the fixed connection between the small inclined cylindrical screw sections and the individualized bosses is further ensured.
According to some embodiments of the invention, the through hole is located in the center of the boss. The stress is even, and the stability of the personalized bone plate in connection with the lower wedge block screw is further enhanced.
According to some embodiments of the present invention, the personalized bone plate is 3D printed as one piece, so that the personalized bone plate can be designed and prepared according to the actual condition of the patient to more precisely match the condition of the patient.
According to some embodiments of the utility model, voussoir screw internal fixation device adopts titanium alloy material to make.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of an upper wedge inclined circular tube according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a lower wedge screw according to an embodiment of the present invention;
FIG. 3 is a schematic view of the wedge screw internal fixation device of the present invention installed in a bone;
an upper wedge inclined round tube 100, a channel 110,
A lower wedge block screw 200, a small inclined cylindrical screw section 210, a cross-shaped groove 211, a large inclined cylindrical screw section 220, a self-tapping screw thread 221,
A personalized bone plate 300, a boss 310,
And (5) bone 400.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper and lower directions, is the orientation or positional relationship shown on the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present invention.
In the description of the present invention, unless there is an explicit limitation, words such as set, installed, connected, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.
A wedge screw internal fixation device according to an embodiment of the present invention is described below with reference to fig. 1, 2 and 3.
As shown in fig. 1-3, the wedge screw internal fixation device according to the embodiment of the present invention comprises a lower wedge screw 200, an upper wedge inclined circular tube 100 and a personalized bone plate 300. The lower wedge block screw 200 comprises an inclined cylindrical small screw section 210 and an inclined cylindrical large screw section 220 which are sequentially connected, a cross-shaped groove 211 is formed in the top surface of the inclined cylindrical small screw section 210, external threads are formed in the outer wall of the inclined cylindrical small screw section 210, the inclined cylindrical large screw section 220 is provided with an inclined surface, self-tapping screw teeth 221 are formed in the outer wall of the inclined cylindrical large screw section 220, and the upper wedge inclined circular tube 100 and the lower wedge screw 200 are combined, so that the lower wedge screw 200 does not need to penetrate through the personalized bone plate 300 to be fixed during traditional internal fixation, the diameter of the lower wedge screw 200 is not limited by the width of the personalized bone plate 300, the size design space of the personalized bone plate 300 and the screw is greatly increased, the diameter of the lower wedge screw 200 is not limited by the width of the personalized bone plate 300, and the size design space of the personalized bone plate 300 and the wedge screw is greatly increased; a channel 110 of an elliptic cylinder structure is axially arranged in the upper wedge inclined circular tube 100 and is used for a small inclined cylindrical screw section 210 to pass through, the small inclined cylindrical screw section 210 passes through the channel 110 from bottom to top and is sleeved in the upper wedge inclined circular tube 100, so that the lower wedge block screw 200 is sleeved with the upper wedge inclined circular tube 100, the upper wedge inclined circular tube 100 and the lower wedge block screw 200 can slide on the inclined plane, in the fixing process, the upper wedge inclined circular tube 100 is vertically fixed, and the lower wedge block screw 200 slides upwards along the inclined plane; the outer diameter of the large inclined cylindrical screw section 220 is equal to the outer diameter of the inclined circular tube 100 of the upper wedge block, the bottom surface of the inclined circular tube 100 of the upper wedge block is an inclined surface, and the inclined angle of the inclined surface is equal to the inclined angle of the inclined surface in the large inclined cylindrical screw section 220; the personalized bone plate 300 is provided with a thread hole having an internal thread matching the small oblique cylindrical screw section 210; when the bone screw is fixed, the cross-shaped groove 211 is screwed from bottom to top, so that the lower wedge block screw 200 drives the upper wedge block inclined circular tube 100 to rotate according to the screwing direction of the screwdriver, and further drives the lower wedge block screw 200 to move upwards, and meanwhile, the self-tapping screw teeth 221 in the inclined cylindrical large screw section 220 tap the bone 400 from bottom to top, so that the lower wedge block screw 200 can keep good anti-extraction force and friction force for a long time in the fixation of the loosened bone 400.
In some embodiments of the utility model, lower wedge screw 200 is integrated into one piece, can avoid the connection between oblique cylinder small screw section 210 and oblique cylinder big screw section 220 to appear becoming flexible, strengthens the steadiness.
In some embodiments of the present invention, the outer diameter of the oblique cylindrical large screw section 220 is equal to the outer diameter of the upper wedge oblique circular tube 100.
In some embodiments of the utility model, still be equipped with boss 310 on the individualized hone lamella 300, be equipped with the through-hole on the boss 310, be equipped with the internal thread the same with the thread hole in the through-hole, the through-hole is coaxial with the thread hole, together supply oblique cylinder miniscrew section 210 to pass through, can guarantee that individualized hone lamella 300 has sufficient thread hole and matches with oblique cylinder miniscrew section 210, and does not influence individualized hone lamella 300's whole thickness after fixed, further guarantee oblique cylinder miniscrew section 210 and individualized boss 310's fixed connection.
In some embodiments of the present invention, the through hole is located in the center of the boss 310. The force is evenly applied, further enhancing the stability of the personalized bone plate 300 when connected with the lower wedge screw 200.
In some embodiments of the present invention, the personalized bone plate 300 is 3D printed and integrated, combining the precision advantages of 3D printed personalized bone plate 300 and the design of the boss 310 in the personalized bone plate 300, the personalized bone plate 300 can be fixed as a compression plate or locking plate, and the personalized bone plate 300 can be designed and prepared according to the actual condition of the patient to match the condition of the patient more precisely.
In some embodiments of the present invention, the wedge screw internal fixation device is made of a titanium alloy material.
Other constructions and operations of the wedge screw internal fixation device according to embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.
Referring to fig. 1 to 3, a wedge screw internal fixation device according to an embodiment of the present invention will be described in detail with a specific embodiment. It is to be understood that the following description is illustrative only and is not intended as a specific limitation on the invention.
As shown in fig. 1-3, the wedge screw internal fixation device comprises a lower wedge screw 200, an upper wedge beveled round tube 100 and a personalized bone plate 300. The lower wedge screw 200 is an inclined cylindrical small screw section 210 and an inclined cylindrical large screw section 220 which are sequentially connected, a cross-shaped groove 211 is formed in the top surface of the inclined cylindrical small screw section 210, external threads are formed in the outer wall of the inclined cylindrical small screw section 210, the inclined cylindrical large screw section 220 is provided with an inclined surface, and self-tapping threads 221 are formed in the outer wall of the inclined cylindrical large screw section 220; an elliptic cylindrical channel 110 is axially arranged in the upper wedge inclined circular tube 100, and an inclined cylindrical small screw section 210 penetrates through the channel 110 from bottom to top and is sleeved in the upper wedge inclined circular tube 100; the outer diameter of the large inclined cylindrical screw section 220 is equal to the outer diameter of the inclined circular tube 100 of the upper wedge block, the bottom surface of the inclined circular tube 100 of the upper wedge block is an inclined surface, and the inclined angle of the inclined surface is equal to the inclined angle of the inclined surface in the large inclined cylindrical screw section 220; the personalized bone plate 300 is provided with a thread hole having an internal thread matching the small oblique cylindrical screw section 210; the upper wedge angled round tube 100 is combined with the lower wedge screw 200 through the angled cylindrical small screw section 210, and the angled cylindrical small screw section 210 is placed under the personalized bone plate 300 and aligned with the threaded hole in the personalized bone plate 300.
Specifically, when the wedge screw internal fixing device is applied to an internal fixing operation of an osteoporosis patient, a hole is drilled in a designed hole position by a drill, the diameter of a nail path is required to be equal to the outer diameter of an upper wedge inclined circular tube 100, and the depth of the nail path is equal to the height of the upper wedge inclined circular tube 100 plus the height of a boss 310 in the personalized bone plate 300, so that enough thread holes are matched with the inclined cylindrical small screw sections 210, the whole thickness of the personalized bone plate 300 is not influenced after the fixation, and the fixed connection of the inclined cylindrical small screw sections 210 and the personalized boss 310 is further ensured; then the upper wedge inclined round tube 100 and the lower wedge screw 200 are combined through the inclined cylindrical small screw section 210, the inclined cylindrical small screw section 210 in the lower wedge screw 200 is placed into a nail path in the upward direction, the inclined cylindrical small screw section 210 of the lower wedge screw 200 is aligned with a through hole at the center of the boss 310 in the personalized bone plate 300 and a thread hole above the boss 310, the lower wedge screw 200 is screwed into the through hole at the center of the boss 310 of the personalized bone plate 300 by a cross screwdriver, the personalized bone plate 300 is pressed and moved downwards at the same time, the lower wedge screw 200 drives the upper wedge inclined round tube 100 to rotate according to the screwing direction of the screwdriver, the personalized bone plate 300 is continuously screwed after being attached to the upper wedge inclined round tube 100, at the same time, the lower wedge screw 200 drives the upper inclined round tube 100 to continuously rotate and the lower wedge screw 200 starts to move upwards to enter the thread hole in the personalized bone plate 300, and simultaneously, self-tapping threads 221 on the inclined cylindrical large screw section 220 start tapping the bone 400 from bottom to top, until the lower wedge screw 200 slides in the channel 110 of the upper wedge inclined circular tube 100 to the limit position of the stroke, the fixation of the osteoporosis 400 is completed. Therefore, the diameter of the lower wedge screw 200 is not limited by the width of the personalized bone plate 300, the size design space of the personalized bone plate 300 and the wedge screw is greatly increased, the screw can keep good pull-out resistance and friction force for a long time in the fixation of the loose bone 400, and the reliability of internal fixation can be ensured particularly for patients with long-term osteoporosis 400.
In the description herein, references to the description of the term "some embodiments" or "examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A wedge screw internal fixation device, comprising:
the lower wedge block screw comprises an inclined cylindrical small screw section and an inclined cylindrical large screw section which are sequentially connected, wherein a cross-shaped groove is formed in the top surface of the inclined cylindrical small screw section, external threads are formed in the outer wall of the inclined cylindrical small screw section, the inclined cylindrical large screw section is provided with an inclined surface, and self-tapping threads are formed in the outer wall of the inclined cylindrical large screw section;
the inclined circular tube is internally provided with a channel along the axial direction, the inclined cylindrical small screw section passes through the channel from bottom to top and is sleeved in the inclined circular tube, so that the lower wedge screw is sleeved with the inclined circular tube, the bottom surface of the inclined circular tube is an inclined surface, and the inclined angle of the bottom surface of the inclined circular tube is equal to that of the inclined surface of the inclined cylindrical large screw section;
the personalized bone plate is provided with a thread hole, and the thread hole is provided with an internal thread matched with the inclined cylindrical small screw section.
2. A wedge screw internal fixation device in accordance with claim 1 wherein the lower wedge screw is integrally formed.
3. A wedge screw internal fixation device in accordance with claim 1, wherein an outer diameter of the large slanted cylindrical screw section is equal to an outer diameter of the slanted cylindrical tube of the upper wedge.
4. The wedge screw internal fixation device of claim 1, wherein the personalized bone plate further comprises a boss, the boss is provided with a through hole, the through hole is internally provided with an internal thread identical to the thread hole, and the through hole is coaxial with the thread hole and is used for the oblique cylindrical small screw section to pass through.
5. A wedge screw internal fixation device in accordance with claim 4, wherein the through hole is located in the center of the boss.
6. The wedge screw internal fixation device of claim 1, wherein the personalized bone plate is integrally formed via 3D printing.
7. The wedge screw internal fixation device of claim 1 wherein the wedge screw internal fixation device is made of a titanium alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922102346.3U CN211534755U (en) | 2019-11-28 | 2019-11-28 | Wedge block screw internal fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922102346.3U CN211534755U (en) | 2019-11-28 | 2019-11-28 | Wedge block screw internal fixing device |
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| Publication Number | Publication Date |
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| CN211534755U true CN211534755U (en) | 2020-09-22 |
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| CN201922102346.3U Active CN211534755U (en) | 2019-11-28 | 2019-11-28 | Wedge block screw internal fixing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110876640A (en) * | 2019-11-28 | 2020-03-13 | 佛山市逸合生物科技有限公司 | Wedge block screw internal fixing device |
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2019
- 2019-11-28 CN CN201922102346.3U patent/CN211534755U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110876640A (en) * | 2019-11-28 | 2020-03-13 | 佛山市逸合生物科技有限公司 | Wedge block screw internal fixing device |
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