CN112155701A - Adjustable screw for calcaneus - Google Patents
Adjustable screw for calcaneus Download PDFInfo
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- CN112155701A CN112155701A CN202011077481.8A CN202011077481A CN112155701A CN 112155701 A CN112155701 A CN 112155701A CN 202011077481 A CN202011077481 A CN 202011077481A CN 112155701 A CN112155701 A CN 112155701A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/683—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B2017/564—Methods for bone or joint treatment
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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- Surgical Instruments (AREA)
Abstract
The invention discloses an adjustable screw for calcaneus. 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 invention includes a body portion, an elongated mandrel, and a shortened mandrel. The main body part comprises a middle cylinder body, a fixed screw head and a telescopic screw head. The fixed screw head and the telescopic screw head are respectively arranged at two ends of the middle cylinder body. The inner end of the fixed screw head is fixed with the middle cylinder. The telescopic screw head can slide along the axial direction of the middle cylinder. The telescopic screw head can be locked when sliding to the position farthest away from the fixed screw head. The fixed screw head and the telescopic screw head are provided with the same external thread. A spreading center hole is formed in the fixed screw head; a shortened central hole is formed in the telescopic screw head; the aperture of the expanded central hole is larger than that of the shortened central hole. The invention can realize the accurate adjustment of the distance between two broken bones by a mode of installing an extension mandrel or a mode of shortening the mandrel.
Description
Technical Field
The invention belongs to the technical field of calcaneus fracture fixation, and particularly relates to an adjustable screw for correcting internal and external turns or short deformity after 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
The invention aims to provide an adjustable screw for calcaneus.
The invention includes a body portion, an elongated mandrel, and a shortened mandrel. The main body part comprises a middle cylinder body, a fixed screw head and a telescopic screw head. The fixed screw head and the telescopic screw head are respectively arranged at two ends of the middle cylinder body. The inner end of the fixed screw head is fixed with the middle cylinder. The telescopic screw head can slide along the axial direction of the middle cylinder. The telescopic screw head can be locked when sliding to the position farthest away from the fixed screw head. The fixed screw head and the telescopic screw head are provided with the same external thread. A spreading center hole is formed in the fixed screw head; a shortened central hole is formed in the telescopic screw head; the opening central hole and the shortening central hole are both provided with internal threads; the aperture of the expanded central hole is larger than that of the shortened central hole.
And all or the middle part or the inner end part on the side surface of the elongated mandrel is provided with an external thread matched with the internal thread of the expanded central hole. The diameter of the end part of the outer end of the extension mandrel is larger than the diameter of the shortened central hole in the telescopic screw head. The whole or the outer end part on the side surface of the shortening mandrel is provided with an external thread matched with the internal thread of the shortening central hole; the inner end part of the shortening mandrel is provided with a head block.
Preferably, the external thread on the outer side surface of the fixed screw head (2) is conical; the diameter of the outer end of the fixed screw head (2) is larger than that of the inner end. The diameter of the inner end of the telescopic screw head (3-1) is equal to that of the inner end of the fixed screw head (2).
Preferably, the outer end part of the outer side surface of the telescopic screw head (3-1) is provided with a tapered self-tapping section thread.
Preferably, the inner side surface of the middle cylinder body is provided with a guide sliding groove. The length direction of the guide sliding chute is parallel to the axis of the middle cylinder. One side of the guide chute close to the end part of the telescopic spiral component is provided with a locking groove. The locking groove is communicated with the guide sliding chute;
the main body part also comprises a connecting cylinder, a sliding plate and a limiting lug; the telescopic screw head, the connecting cylinder, the sliding plate and the limiting lug are fixed together to form a telescopic screw assembly. The telescopic screw head, the connecting cylinder and the sliding plate are sequentially connected in series. The limiting convex block is fixed on the side part of the sliding plate. The sliding plate is positioned in the inner cavity of the middle cylinder body; the limiting convex block extends into the guide sliding groove or the locking groove. The width of the limiting lug is equal to that of the locking groove. The positions of the locking groove and the guide sliding groove correspond to the rotation directions of the external threads on the fixed screw head and the telescopic screw head, so that the limiting lug can be kept in the locking groove in the process of screwing the fixed screw head and the telescopic screw head into the skeleton.
Preferably, the end part of the middle cylinder body, which is provided with the telescopic screw assembly, is coaxially fixed with a limit ring. The inner diameter of the limiting ring is smaller than that of the middle cylinder. The connecting cylinder passes through the central hole of the limiting ring.
Preferably, the guide sliding groove penetrates through the side wall of the middle cylinder.
Preferably, a chamfer is arranged at the joint of the locking groove and the guide sliding groove.
Preferably, a polygonal groove is formed in the center of the outer end of the fixing screw head. The thicknesses of the head blocks on the extension mandrel (4) and the shortening mandrel (5) are smaller than the depth of the polygonal groove on the fixed screw head (2).
Preferably, the inner cavity of the middle cylinder body is cylindrical.
Preferably, the internal threads on the expanding central hole and the shortening central hole have the same rotating direction as the external threads on the fixed screw head and the telescopic screw head.
The invention has the beneficial effects that:
1. the invention can be driven into the fracture of the calcaneus by an electric drill, and the distance between two broken bones can be accurately adjusted by a mode of installing an extension mandrel or shortening the mandrel.
2. According to the invention, the telescopic screw head is locked when extending out to the outermost end, so that two broken bones with a longer distance can still be respectively fixed with the fixed screw head and the telescopic screw head, and the invention can adapt to different calcaneus fracture conditions.
Drawings
FIG. 1 is a schematic structural view of a main body part in a state of tightening a broken bone and screwing;
FIG. 2 is a schematic structural view of the main body in a state of distracting and screwing the fractured bones;
FIG. 3 is a cross-sectional view of the mating of the body portion and elongated mandrel of the present invention;
FIG. 4 is a cross-sectional view of the mating of the body portion and shortening mandrel of the present invention;
figure 5 is a schematic view of the present invention installed in a calcaneus fracture site.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, an adjustable screw for calcaneus includes a body portion, an elongated stem 4, and a shortened stem 5. The main body part comprises a middle cylinder 1, a fixed screw head 2 and a telescopic screw component 3. The fixed screw head 2 and the telescopic screw component 3 are respectively arranged at two ends of the middle cylinder 1. The inner end of the fixed screw head 2 is fixed with the middle cylinder 1. The inner cavity of the middle cylinder body 1 is cylindrical. The end part of the middle cylinder 1, which is provided with the telescopic screw component 3, is coaxially fixed with a limiting ring 1-1. The inner diameter of the limiting ring 1-1 is smaller than that of the middle cylinder 1. The inner side surface of the middle cylinder body 1 is provided with a guide chute 1-2. 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. One side of the guide chute 1-2 close to the end part of the telescopic spiral component 3 is provided with a locking groove 1-3. The locking groove 1-3 is communicated with the side edge of the guide chute 1-2; a chamfer is arranged at the joint of the locking groove 1-3 and the guide chute 1-2, so that the limiting lug 3-4 can be conveniently guided into the locking groove 1-3 from the guide chute 1-2.
The telescopic screw component 3 comprises a telescopic screw head 3-1, a connecting cylinder 3-2, a sliding plate 3-3 and a limit lug 3-4 which are fixed together. The telescopic screw head 3-1, the connecting cylinder 3-2 and the sliding plate 3-3 are arranged and adjacent in sequence. The limit lug 3-4 is fixed on the side part of the sliding plate 3-3. The sliding plate 3-3 is positioned in the inner cavity of the middle cylinder body 1; the limiting convex block 3-4 extends into the guide chute 1-2 to form a sliding pair with the guide chute 1-2. The connecting cylinder 3-2 penetrates through the central hole of the limiting ring 1-1. The limiting ring 1-1 can prevent the sliding plate 3-3 from separating from the inner cavity of the middle cylinder body 1. The outer side surface of the fixed screw head 2 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 telescopic screw head 3-1) of the fixed screw head 2 is larger than that of the inner end (the end near the telescopic screw head 3-1). The end part of the outer end of the outer side surface of the telescopic screw head 3-1 is provided with a tapered self-tapping section thread; the outer side surface of the telescopic 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 fixed screw head 2, the self-tapping section thread on the telescopic screw head 3-1 and the cylindrical section thread are all equal; the diameter of the inner end of the telescopic screw head 3-1 is equal to that of the inner end of the fixed screw head 2, so that the fixed screw head 2 can move forward continuously along the internal thread tapped by the telescopic screw head 3-1 in the calcaneus. The self-tapping section thread at the outer end of the telescopic 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 adjustable screw for the calcaneus is screwed into the calcaneus. Because the internal thread produced according to the skeleton easily takes place wearing and tearing and destruction, so with fixed spiral shell head design toper for fixed spiral shell head can deepen the internal thread again when the hole of screw in calcaneus, ensures that fixed spiral shell head 2 can reliably be fixed together with the calcaneus.
The locking groove 1-3 is positioned at one side of the guide chute 1-2 which rotates along the positive direction of the middle cylinder 1 (namely, when the middle cylinder 1 rotates in the positive direction, the locking groove 1-3 is positioned at one side of the guide chute 1-2 which is close to the rotation direction of the middle cylinder); the positive rotation direction of the middle cylinder 1 represents the direction in which the fixed screw head 2 and the telescopic screw head 3-1 are screwed into the skeleton; the width of the limiting convex block 3-4 is equal to that of the locking groove 1-3. The telescopic screw component 3 is pulled to the outer limit position and rotated, and then the limit lug 3-4 can be rotated into the locking groove 1-3. When the limiting lug 3-4 is positioned in the guide chute 1-2, the telescopic screw component 3 can slide along the axial direction of the middle cylinder 1 and cannot rotate; when the limiting lug 3-4 is positioned in the locking groove 1-3, the telescopic screw component 3 cannot slide along the axial direction of the middle cylinder 1, but can enter the guide chute 1-2 again through rotation; when the limiting lug 3-4 is positioned in the locking groove 1-3, the broken bone connecting nail is in a state of tensioning broken bone screwing; when the limiting convex blocks 3-4 are positioned at the extreme positions close to the fixing screw head 2, the broken bone connecting nail is in a state of propping open the broken bone and screwing;
as shown in fig. 3 and 4, a polygonal groove is formed in the center of the outer end of the fixing screw head 2, so that the broken bone connecting nail can rotate under the driving of an electric drill. The polygonal groove is specifically an inner hexagonal groove corresponding to the outer hexagonal wrench. A spreading central hole 2-1 is arranged in the fixed screw head 2; a shortening central hole 3-5 is arranged in the telescopic screw head 3-1, the connecting cylinder 3-2 and the sliding plate 3-3; internal threads are arranged on the opening central hole 2-1 and the shortening central hole 3-5; the screwing directions of internal threads on the expanding central hole 2-1 and the shortening central hole 3-5 are the same as the screwing directions of external threads on the fixed screw head 2 and the telescopic screw head 3-1. The aperture of the expanded central hole 2-1 is larger than that of the shortened central hole 3-5. The inner end parts of the extension mandrel 4 and the shortening mandrel 5 are provided with head blocks. The head block can be placed in the polygonal groove, and the diameter of the head block is larger than the diameter of the opening center hole 2-1; the head block is provided with an inner hexagonal groove. The thickness of the head blocks on the extension mandrel 4 and the shortening mandrel 5 are both smaller than the depth of the polygonal groove on the fixed screw head 2. Thus, the adjustable screw for calcaneus can be unscrewed from the calcaneus by the polygonal groove without removing the shortening stem 5.
All or the middle part or the inner end part on the side surface of the elongated mandrel 4 is provided with an external thread matched with the internal thread of the distraction central hole 2-1. The diameter of the part of the extension mandrel 4 without the external thread is smaller than or equal to the small diameter of the internal thread of the distraction center hole 2-1. The diameter of the end part of the outer end of the extension mandrel 4 is larger than the diameter of the shortened central hole 3-5 in the telescopic screw head 3-1, so that the extension mandrel 4 can abut against the inner end of the telescopic screw head 3-1 and cannot extend into the shortened central hole 3-5. The fixed screw head 2 and the telescopic screw head 3-1 can be unfolded by thrust generated by the extension mandrel 4 to the telescopic screw head 3-1.
When the shortening mandrel 5 is in threaded connection with the shortening center hole 3-5 and a head block of the shortening mandrel 5 is in contact with the fixed screw head 2, the shortening mandrel 5 is rotated to generate pulling force on the telescopic screw head 3-1, so that the fixed screw head 2 and the telescopic screw head 3-1 are pulled close.
The working principle of the invention when used for fixing the 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 telescopic screw head 3-1.
Then, if the two calcaneus need to be drawn close to each other for a certain distance, the broken bone connecting nail is adjusted to be in a state of tensioning broken bone and screwing; if the two calcaneus are required to be mutually propped for a certain distance, the broken bone connecting nail is adjusted to be in a propped-open broken bone screwing state;
then, the main body part is rotated and tapped to the central mounting holes of the two calcaneus bones in the positive direction in a state that the telescopic screw heads 3-1 face inwards, so that the fixed screw head 2, the telescopic screw heads 3-1 and the two calcaneus bones are respectively in threaded connection.
Finally, if the two calcaneus bones need to be drawn close to each other for a certain distance, the fixing screw head 2 is reversed, so that the limiting lug 3-4 enters the guide chute 1-2 from the locking groove 1-3, the shortening mandrel 5 extends into the fixing screw head 2 to be screwed with the internal thread of the telescopic screw head 3-1, the distance between the fixing screw head 2 and the telescopic screw head 3-1 is shortened by rotating the shortening mandrel 5, and the quantitative drawing close and supporting of the distance between the two calcaneus bones are realized.
If the two calcaneus bones need to be mutually expanded by a certain distance, the extension mandrel 4 extends into the fixed screw head 2 to be screwed with the internal thread of the fixed screw head 2, the distance between the fixed screw head 2 and the telescopic screw head 3-1 is increased by rotating the shortening mandrel 5, and the quantitative expansion and support of the distance between the two calcaneus bones are realized.
Claims (10)
1. An adjustable screw for calcaneus comprises a main body part, an extension mandrel (4) and a shortening mandrel (5); the method is characterized in that: the main body part comprises a middle cylinder (1), a fixed screw head (2) and a telescopic screw head (3-1); the fixed screw head (2) and the telescopic screw head (3-1) are respectively arranged at two ends of the middle cylinder body (1); the inner end of the fixed screw head (2) is fixed with the middle cylinder (1); the telescopic screw head (3-1) can slide along the axial direction of the middle cylinder body (1); the telescopic screw head (3-1) can be locked when sliding to the position farthest away from the fixed screw head (2); external threads are arranged on the fixed screw head (2) and the telescopic screw head (3-1); a spreading center hole (2-1) is arranged in the fixed screw head (2); a shortened central hole (3-5) is arranged in the telescopic screw head (3-1); internal threads are arranged on the opening central hole (2-1) and the shortening central hole (3-5); the aperture of the expanded central hole (2-1) is larger than that of the shortened central hole (3-5);
all or the middle part or the inner end part on the side surface of the extension mandrel (4) is provided with an external thread matched with the internal thread of the opening central hole (2-1); the diameter of the end part of the outer end of the extension mandrel (4) is larger than the aperture of a shortened central hole (3-5) in the telescopic screw head (3-1); the whole or the outer end part on the side surface of the shortening mandrel (5) is provided with an external thread matched with the internal thread of the shortening central hole (3-5); the inner end part of the shortening mandrel (5) is provided with a head block.
2. An adjustable screw for calcaneus according to claim 1, wherein: the external thread on the outer side surface of the fixed screw head (2) is conical; the diameter of the outer end of the fixed screw head (2) is larger than that of the inner end; the diameter of the inner end of the telescopic screw head (3-1) is equal to that of the inner end of the fixed screw head (2).
3. An adjustable screw for calcaneus according to claim 1, wherein: the outer end part of the outer side surface of the telescopic screw head (3-1) is provided with a conical self-tapping section thread.
4. An adjustable screw for calcaneus according to claim 1, wherein: the inner side surface of the middle cylinder body (1) is provided with a guide chute (1-2); the length direction of the guide chute (1-2) is parallel to the axis of the middle cylinder (1); one side of the guide chute (1-2) close to the end part of the telescopic spiral component (3) is provided with a locking groove (1-3); the locking groove (1-3) is communicated with the guide chute (1-2);
the main body part also comprises a connecting cylinder (3-2), a sliding plate (3-3) and a limiting lug (3-4); the telescopic screw head (3-1), the connecting cylinder (3-2), the sliding plate (3-3) and the limiting lug (3-4) are fixed together to form a telescopic screw component (3); the telescopic screw head (3-1), the connecting cylinder (3-2) and the sliding plate (3-3) are sequentially arranged and connected; the limiting convex block (3-4) is fixed on the side part of the sliding plate (3-3); the sliding plate (3-3) is positioned in the inner cavity of the middle cylinder body (1); the limiting convex block (3-4) extends into the guide chute (1-2) or the locking groove (1-3); the width of the limiting convex block (3-4) is equal to that of the locking groove (1-3); the positions of the locking groove (1-3) and the guide chute (1-2) correspond to the rotation directions of the external threads on the fixed screw head (2) and the telescopic screw head (3-1), so that the limiting bump (3-4) can be kept in the locking groove (1-3) in the process of screwing the fixed screw head (2) and the telescopic screw head (3-1) into the skeleton.
5. An adjustable screw for calcaneus according to claim 4, wherein: the end part of the middle cylinder (1) provided with the telescopic screw component (3) is coaxially fixed with a limiting ring (1-1); the inner diameter of the limiting ring (1-1) is smaller than that of the middle cylinder (1); the connecting cylinder (3-2) passes through the central hole of the limiting ring (1-1).
6. An adjustable screw for calcaneus according to claim 4, wherein: the guide sliding groove (1-2) penetrates through the side wall of the middle cylinder body (1).
7. An adjustable screw for calcaneus according to claim 4, wherein: and a chamfer is arranged at the joint of the locking groove (1-3) and the guide chute (1-2).
8. An adjustable screw for calcaneus according to claim 1, wherein: a polygonal groove is formed in the center of the outer end of the fixed screw head (2); the thicknesses of the head blocks on the extension mandrel (4) and the shortening mandrel (5) are smaller than the depth of the polygonal groove on the fixed screw head (2).
9. An adjustable screw for calcaneus according to claim 1, wherein: the inner cavity of the middle cylinder body (1) is cylindrical.
10. An adjustable screw for calcaneus according to claim 1, wherein: the screwing directions of internal threads on the expanding central hole (2-1) and the shortening central hole (3-5) are the same as the screwing directions of external threads on the fixed screw head (2) and the telescopic screw head (3-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011077481.8A CN112155701B (en) | 2020-10-10 | 2020-10-10 | Adjustable screw for calcaneus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011077481.8A CN112155701B (en) | 2020-10-10 | 2020-10-10 | Adjustable screw for calcaneus |
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| Publication Number | Publication Date |
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| CN112155701A true CN112155701A (en) | 2021-01-01 |
| CN112155701B CN112155701B (en) | 2023-03-28 |
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| CN202011077481.8A Active CN112155701B (en) | 2020-10-10 | 2020-10-10 | Adjustable screw for calcaneus |
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