CN213910480U - Bidirectional screw type telescopic screw for calcaneus - Google Patents
Bidirectional screw type telescopic screw for calcaneus Download PDFInfo
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- CN213910480U CN213910480U CN202022242661.9U CN202022242661U CN213910480U CN 213910480 U CN213910480 U CN 213910480U CN 202022242661 U CN202022242661 U CN 202022242661U CN 213910480 U CN213910480 U CN 213910480U
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Abstract
The utility model discloses a heel bone is with two-way screw telescopic screw. Compression fracture of cancellous bone often occurs after severe violence on the calcaneus bone, resulting in varus and valgus deformity and high loss of the heel. The utility model discloses a middle barrel, the flexible section of thick bamboo of rear portion, the flexible section of thick bamboo of front portion and two-way screw rod. The front telescopic cylinder and the front telescopic cylinder are respectively connected to two ends of the middle cylinder body in a sliding mode. The outer end of the front telescopic cylinder is provided with a front screw head; the outer end of the rear telescopic cylinder is provided with a rear screw head; the central holes of the front telescopic cylinder and the rear telescopic cylinder are provided with internal threads with opposite turning directions. Two sections of external threads with opposite rotation directions on the bidirectional screw and internal threads of the front telescopic cylinder and the rear telescopic cylinder respectively form a screw pair. The bidirectional screw and the inner cavity of the middle cylinder form a revolute pair. The utility model discloses can realize two accurate regulation of cutting apart the distance between the bone through the mode of packing into extension dabber or shortening the dabber.
Description
Technical Field
The utility model belongs to the technical field of calcaneus fracture is fixed, concretely relates to adjustable screw who turns over or the deformity of shortening inside and outside appearing after correcting calcaneus fracture.
Background
The calcaneus is the largest tarsal bone of a human body and is an irregular structure formed by wrapping rich cancellous bones by thin cortical bones, after the tarsal bone is severely violently stressed, the compression fracture of the cancellous bones often causes the inward-outward turning deformity and the height loss of the heel, after a common hollow screw is screwed in the bone block for fixation, if the inward-outward turning or the height loss is not corrected enough in perspective, the screw needs to be removed for adjustment again, and the repeated adjustment can cause the nail passage hole to be loosened and even the internal fixation to fail.
Disclosure of Invention
An object of the utility model is to provide a heel bone is with two-way screw telescopic screw.
The utility model discloses a middle barrel, the flexible section of thick bamboo of rear portion, the flexible section of thick bamboo of front portion and two-way screw rod. The front telescopic cylinder and the front telescopic cylinder are respectively connected to two ends of the middle cylinder body in a sliding mode. The outer end of the front telescopic cylinder is provided with a front screw head; the outer end of the rear telescopic cylinder is provided with a rear screw head; the central holes of the front telescopic cylinder and the rear telescopic cylinder are provided with internal threads with opposite turning directions. Two sections of external threads with opposite rotation directions on the bidirectional screw and internal threads of the front telescopic cylinder and the rear telescopic cylinder respectively form a screw pair. The bidirectional screw and the inner cavity of the middle cylinder form a revolute pair.
Preferably, the outer side surface of the rear screw head is provided with a conical external thread; the diameter of the outer end of the rear screw head is larger than that of the inner end. The outer end part of the outer side surface of the front screw head is provided with a conical self-tapping section thread; the diameter of the inner end of the front screw head is equal to that of the inner end of the rear screw head.
Preferably, the bidirectional screw comprises a front screw, a middle disc and a rear screw which are sequentially and fixedly connected. Clamp springs are arranged in two clamp spring grooves in the middle of the inner cavity of the middle barrel. The middle disc is arranged between the two clamp springs and forms a revolute pair with the inner cavity of the middle cylinder.
Preferably, the two end ends of the middle cylinder body are coaxially fixed with limiting rings. The inner diameter of the limiting ring is smaller than that of the middle cylinder.
Preferably, two ends of the inner side surface of the middle cylinder body are respectively provided with one or more guide sliding chutes, and the length directions of the guide sliding chutes are parallel to the axis of the middle cylinder body. The length direction of the guide sliding chute is parallel to the axis of the middle cylinder. The guide sliding groove penetrates through the side wall of the middle cylinder body.
Preferably, the front telescopic cylinder comprises a front screw head, a front connecting cylinder, a front sliding plate and a front limiting bump which are sequentially and fixedly connected. The front limit lug is fixed on the side part of the front sliding plate. The front sliding plate is positioned in the inner cavity of the middle cylinder body; the front limiting convex block extends into the guide sliding groove at the front end of the middle cylinder body to form a sliding pair with the guide sliding groove. The front connecting cylinder passes through a central hole of a limiting ring at the front end of the middle cylinder body.
Preferably, the rear telescopic cylinder comprises a rear screw head, a rear connecting cylinder, a rear sliding plate and a rear limiting bump which are sequentially and fixedly connected. One or more rear limit projections are fixed to the side of the rear slide plate. The rear sliding plate is positioned in the inner cavity of the middle cylinder body; the rear limiting projection extends into the guide sliding groove at the rear end of the middle cylinder body and forms a sliding pair with the guide sliding groove. The rear connecting cylinder passes through a central hole of a limiting ring at the rear end of the middle cylinder body.
Preferably, a polygonal groove is formed in the center of the outer end of the rear screw head.
Preferably, a polygonal groove is arranged on the end face of one end of the bidirectional screw
Preferably, the inner cavity of the middle cylinder body is cylindrical.
The utility model has the advantages that:
the utility model discloses can squeeze into calcaneum fracture department through the electric drill, and realize the accurate regulation of two distances between the broken bone through the mode of rotating two-way screw rod.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic view of a bi-directional screw of the present invention;
fig. 4 is the schematic diagram of the fracture position of the calcaneus bone of the utility model.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 and 2, a bidirectional screw type telescopic screw for calcaneus comprises a middle cylinder body 1, a rear telescopic cylinder 2, a front telescopic cylinder 3 and a bidirectional screw 4. The front telescopic cylinder 2 and the front telescopic cylinder 3 are respectively connected with two ends of the middle cylinder body 1 in a sliding way. The inner cavity of the middle cylinder body 1 is cylindrical. Two clamp spring grooves which are arranged at intervals are arranged in the middle of the inner cavity of the middle barrel body 1. The two end parts of the middle cylinder body 1 are coaxially fixed with limiting rings 1-1. The inner diameter of the limiting ring 1-1 is smaller than that of the middle cylinder 1. Two ends of the inner side surface of the middle cylinder body 1 are respectively provided with one or more guide sliding chutes 1-2 with the length directions parallel to the axis of the middle cylinder body 1. The length direction of the guide chute 1-2 is parallel to the axis of the middle cylinder 1. The guide chute 1-2 penetrates through the side wall of the middle cylinder 1.
The front telescopic cylinder 3 comprises a front screw head 3-1, a front connecting cylinder 3-2, a front sliding plate 3-3 and a front limiting bump 3-4 which are sequentially and fixedly connected. One or more front limit projections 3-4 are fixed to the side of the front sliding plate 3-3. The front sliding plate 3-3 is positioned in the inner cavity of the middle cylinder body 1; the front limit bump 3-4 extends into the guide chute 1-2 at the front end of the middle cylinder 1 to form a sliding pair with the guide chute 1-2, so that the front telescopic cylinder 3 and the middle cylinder 1 form a sliding pair. The front connecting cylinder 3-2 passes through the central hole of the limiting ring 1-1 at the front end of the middle cylinder 1. The limiting ring 1-1 can prevent the front sliding plate 3-3 from separating from the inner cavity of the middle cylinder body 1.
The rear telescopic cylinder 2 comprises a rear screw head 2-1, a rear connecting cylinder 2-2, a rear sliding plate 2-3 and a rear limiting lug 2-4 which are sequentially and fixedly connected. One or more rear limit projections 2-4 are fixed to the side of the rear slide plate 2-3. The rear sliding plate 2-3 is positioned in the inner cavity of the middle cylinder body 1; the rear limiting convex block 2-4 extends into the guide chute 1-2 at the rear end of the middle cylinder body 1 to form a sliding pair with the guide chute 1-2, so that the rear telescopic cylinder 2 and the middle cylinder body 1 form a sliding pair. The rear connecting cylinder 2-2 passes through the central hole of the limiting ring 1-1 at the rear end of the middle cylinder 1. The limiting ring 1-1 can prevent the rear sliding plate 2-3 from separating from the inner cavity of the middle cylinder body 1.
As shown in fig. 2 and 3, the central holes of the front telescopic cylinder 3 and the rear telescopic cylinder 2 are provided with internal threads with opposite screwing directions. The bidirectional screw 4 comprises a front screw 4-1, an intermediate disc 4-2 and a rear screw 4-3 which are sequentially and fixedly connected. The clamp springs 5 are arranged in the two clamp spring grooves in the middle of the inner cavity of the middle barrel body 1. The middle disc 4-2 is arranged between the two clamp springs and forms a revolute pair with the inner cavity of the middle cylinder 1. The external thread on the front screw rod 4-1 and the external thread on the rear screw rod 4-3 have opposite rotating directions. The external thread on the front screw rod 4-1 is connected with the internal thread on the central hole of the front telescopic cylinder 3 through threads; the external thread on the rear screw rod 4-3 is connected with the internal thread on the central hole of the rear telescopic cylinder 3 through threads. The end face of the outer end of the rear screw rod 4-3 is provided with a polygonal groove (specifically, an inner hexagonal groove) for realizing the rotation of the bidirectional screw rod 4. When the double screws rotate, the front screw rod 4-1 and the rear screw rod 4-3 are driven to rotate in opposite directions, so that the front telescopic cylinder 3 and the rear telescopic cylinder 2 are driven to slide in opposite directions, and the distance between the front screw head 3-1 and the rear screw head 2-1 is adjusted.
The center position of the outer end of the rear screw head 2-1 is provided with a polygonal groove (particularly an inner hexagonal groove) for facilitating the rotation of the broken bone connecting nail driven by an electric drill. The outer side surface of the rear screw head 2-1 is in a round table shape (with taper) and is provided with a tapered external thread; the diameter of the outer end (the end far away from the front screw head 3-1) of the rear screw head 2-1 is larger than that of the inner end (the end close to the front screw head 3-1). The outer end part of the outer side surface of the front screw head 3-1 is provided with a conical self-tapping section thread; the outer side surface of the front screw head 3-1 except the self-tapping section threads is provided with cylindrical section threads. The thread pitches of the conical external thread on the rear screw head 2-1, the self-tapping section thread on the front screw head 3-1 and the cylindrical section thread are all equal; the diameter of the inner end of the front screw head 3-1 is equal to that of the inner end of the rear screw head 2-1, so that the rear screw head 2-1 can go forward continuously along the internal thread tapped in the calcaneus by the front screw head 3-1. The self-tapping section thread at the outer end of the front screw head 3-1 is convenient for tapping external threads in a hole formed in the fractured calcaneus in advance, and reduces the abrasion when the bidirectional screw type telescopic screw for the calcaneus is screwed into the calcaneus. Because the internal thread generated in the skeleton is easy to wear and damage, the rear screw head is designed to be conical, so that the internal thread can be deepened again when the rear screw head is screwed into the hole of the calcaneus, and the rear screw head 2-1 and the calcaneus can be reliably fixed together.
The lead angles of the internal threads on the front telescopic cylinder 3 and the rear telescopic cylinder 2 are larger than the lead angles of the external threads on the front screw head 3-1 and the rear screw head 2-1, so that the integral rotation of the bidirectional screw type telescopic screw for the calcaneus is not easy to cause when the bidirectional screw 4 is rotated. The middle cylinder 1 is formed by assembling two half cylinders in a butt joint mode, and installation of the rear telescopic cylinder 2, the front telescopic cylinder 3 and the bidirectional screw rod 4 is facilitated.
As shown in fig. 4, the working principle of the present invention for fixing fractured and partially missing calcaneus is as follows:
firstly, drilling central mounting holes on two calcaneus with partial deletion in the middle to ensure that the two calcaneus are provided with coaxial central mounting holes; the aperture of the central mounting hole corresponds to the small diameter of the cylindrical section thread of the front screw head 3-1.
Then, if the two calcaneus bones need to be drawn close to each other for a certain distance, the distance between the front screw head 3-1 and the rear screw head 2-1 is maximized by rotating the bidirectional screw rod 4 forward; if the two calcaneus are required to be mutually propped for a certain distance, the front screw head 3-1 is in contact with the rear screw head 2-1 or the distance between the two screw heads is minimized by reversely rotating the bidirectional screw rod 4;
then, the main body part is rotationally tapped into the central mounting holes of the two calcaneus bones in a posture that the front screw head 3-1 faces inwards, so that the rear screw head 2-1 and the front screw head 3-1 are respectively in threaded connection with the two calcaneus bones.
And finally, if the two calcaneus bones need to be drawn close to each other for a certain distance, the bidirectional screw rod 4 is rotated reversely, the distance between the rear screw head 2-1 and the front screw head 3-1 is shortened, and quantitative drawing close and supporting of the distance between the two broken bones are realized. If the two calcaneus bones need to be mutually propped apart by a certain distance, the bidirectional screw rod 4 is rotated positively, the distance between the rear screw head 2-1 and the front screw head 3-1 is increased, and the quantitative propping and supporting of the distance between the two calcaneus bones are realized.
Claims (10)
1. The utility model provides a calcaneus is with flexible screw of two-way screw which characterized in that: comprises a middle cylinder body (1), a rear telescopic cylinder (2), a front telescopic cylinder (3) and a bidirectional screw (4); the rear telescopic cylinder (2) and the front telescopic cylinder (3) are respectively connected to two ends of the middle cylinder body (1) in a sliding manner; the outer end of the front telescopic cylinder (3) is provided with a front screw head (3-1); the outer end of the rear telescopic cylinder (2) is provided with a rear screw head (2-1); the central holes of the front telescopic cylinder (3) and the rear telescopic cylinder (2) are provided with internal threads with opposite turning directions; two sections of external threads with opposite rotation directions on the bidirectional screw (4) and internal threads of the front telescopic cylinder (3) and the rear telescopic cylinder (2) respectively form a screw pair; the bidirectional screw (4) and the inner cavity of the middle cylinder (1) form a revolute pair.
2. The bi-directional screw-type expansion screw for calcaneus according to claim 1, wherein: the outer side surface of the rear screw head (2-1) is provided with a conical external thread; the diameter of the outer end of the rear screw head (2-1) is larger than that of the inner end; the outer end part of the outer side surface of the front screw head (3-1) is provided with a conical self-tapping section thread; the diameter of the inner end of the front screw head (3-1) is equal to that of the inner end of the rear screw head (2-1).
3. The bi-directional screw-type expansion screw for calcaneus according to claim 1, wherein: the bidirectional screw (4) comprises a front screw (4-1), an intermediate disc (4-2) and a rear screw (4-3) which are sequentially and fixedly arranged; clamp springs (5) are arranged in two clamp spring grooves in the middle of the inner cavity of the middle barrel body (1); the middle disc (4-2) is arranged between the two clamp springs and forms a revolute pair with the inner cavity of the middle cylinder body (1).
4. The bi-directional screw-type expansion screw for calcaneus according to claim 1, wherein: limiting rings (1-1) are coaxially fixed at the end parts of the two ends of the middle cylinder body (1); the inner diameter of the limiting ring (1-1) is smaller than that of the middle cylinder body (1).
5. The bi-directional screw-type expansion screw for calcaneus according to claim 4, wherein: two ends of the inner side surface of the middle cylinder body (1) are respectively provided with one or more sections of guide chutes (1-2) with the length directions parallel to the axis of the middle cylinder body (1); the length direction of the guide chute (1-2) is parallel to the axis of the middle cylinder (1); the guide sliding chute (1-2) penetrates through the side wall of the middle cylinder body (1).
6. The bi-directional screw-type expansion screw for calcaneus according to claim 5, wherein: the front telescopic cylinder (3) comprises a front screw head (3-1), a front connecting cylinder (3-2), a front sliding plate (3-3) and a front limiting lug (3-4) which are sequentially and fixedly connected; the front limiting lug (3-4) is fixed on the side part of the front sliding plate (3-3); the front sliding plate (3-3) is positioned in the inner cavity of the middle cylinder body (1); the front limiting convex block (3-4) extends into a guide sliding chute (1-2) positioned at the front end of the middle cylinder body (1) to form a sliding pair with the guide sliding chute (1-2); the front connecting cylinder (3-2) passes through the central hole of the limiting ring (1-1) at the front end of the middle cylinder body (1).
7. The bi-directional screw-type expansion screw for calcaneus according to claim 5, wherein: the rear telescopic cylinder (2) comprises a rear screw head (2-1), a rear connecting cylinder (2-2), a rear sliding plate (2-3) and a rear limiting lug (2-4) which are sequentially and fixedly connected; one or more rear limit projections (2-4) are fixed on the side of the rear sliding plate (2-3); the rear sliding plate (2-3) is positioned in the inner cavity of the middle cylinder body (1); the rear limiting convex block (2-4) extends into a guide sliding chute (1-2) positioned at the rear end of the middle cylinder body (1) to form a sliding pair with the guide sliding chute (1-2); the rear connecting cylinder (2-2) passes through the central hole of the limiting ring (1-1) at the rear end of the middle cylinder body (1).
8. The bi-directional screw-type expansion screw for calcaneus according to claim 1, wherein: the center of the outer end of the rear screw head (2-1) is provided with a polygonal groove.
9. The bi-directional screw-type expansion screw for calcaneus according to claim 1, wherein: a polygonal groove is arranged on the end face of one end of the bidirectional screw rod (4).
10. The bi-directional screw-type expansion screw for calcaneus according to claim 1, wherein: the inner cavity of the middle cylinder body (1) is cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022242661.9U CN213910480U (en) | 2020-10-10 | 2020-10-10 | Bidirectional screw type telescopic screw for calcaneus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022242661.9U CN213910480U (en) | 2020-10-10 | 2020-10-10 | Bidirectional screw type telescopic screw for calcaneus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213910480U true CN213910480U (en) | 2021-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022242661.9U Active CN213910480U (en) | 2020-10-10 | 2020-10-10 | Bidirectional screw type telescopic screw for calcaneus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213910480U (en) |
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2020
- 2020-10-10 CN CN202022242661.9U patent/CN213910480U/en active Active
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