CN112790849A - Two-way pressurization limit for a distance slip screw of thighbone neck and screwdriver - Google Patents
Two-way pressurization limit for a distance slip screw of thighbone neck and screwdriver Download PDFInfo
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- CN112790849A CN112790849A CN202011615463.0A CN202011615463A CN112790849A CN 112790849 A CN112790849 A CN 112790849A CN 202011615463 A CN202011615463 A CN 202011615463A CN 112790849 A CN112790849 A CN 112790849A
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- outer sleeve
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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
- A61B17/74—Devices for the head or neck or trochanter of the femur
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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
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8875—Screwdrivers, spanners or wrenches
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Abstract
The invention discloses a bidirectional-pressurizing distance-limiting sliding screw and a screwdriver for a femoral neck, and relates to the technical field of medical instruments, wherein the bidirectional-pressurizing distance-limiting sliding screw for the femoral neck comprises an inner core, wherein the head of the inner core is provided with a first external thread; the tail part of the outer sleeve is provided with a second external thread, the thread pitch of the second external thread is different from that of the first external thread, the tail part of the inner core is connected with the head part of the outer sleeve through a connecting structure and can axially slide relatively, and the outer sleeve is provided with a distance limiting structure so as to limit the relative sliding distance between the inner core and the outer sleeve; and the connecting part is arranged at the tail part of the outer sleeve. The first external thread of the inner core and the second external thread of the outer sleeve can enable the fractured end of the femoral neck to play a role of bidirectional pressurization in the process of entering the proximal end of the femur, so that the stability of the fractured end of the femur is improved.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a femoral neck bidirectional pressurizing distance-limiting sliding screw and a screwdriver.
Background
At present, femoral neck fracture accounts for 3.85% of fracture of adults, is a common fracture and can occur in various age groups. Nonunion after femoral neck fracture operation and avascular necrosis of the femoral head are always difficult points of traumatic orthopedic treatment. At present, great controversy still exists for hip protection treatment of femoral neck fracture, different internal femoral neck fracture fixation instruments emerge in markets at home and abroad, and the internal femoral neck fracture fixation instrument is enough to indicate that the internal femoral neck fracture fixation instrument is still not perfect.
In recent years, attention and thinking have been paid to the complication of femoral neck shortening after femoral neck fracture surgery, and the femoral neck is excessively shortened, so that pain can be caused when the shortening is more than 5mm, gait of lower limbs can be affected, and hip joint movement failure (marked by abduction or limitation of external rotation) can be caused. After the internal fixation of femoral neck fracture, in the healing process, the fracture end slides and pressurizes to promote bone healing, and simultaneously, the femoral neck is shortened, and the neck is shortened after the internal fixation of femoral neck fracture at present, especially for osteoporosis patients. There is a need for a femoral neck fixation device that provides a sufficient balance between maintaining post-operative sliding compression of the fractured end (promoting fracture healing) and maintaining femoral neck length (improving post-operative hip joint function).
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the embodiment of the invention provides the femoral neck bidirectional pressurizing distance-limiting sliding screw which can perform bidirectional pressurizing on the fractured end of the femoral neck, and the stability of the fractured end is improved.
The embodiment of the invention also provides a screwdriver which is matched with the femoral neck bidirectional pressurizing distance-limiting sliding screw for use.
According to an embodiment of the first aspect of the invention, a bidirectional compression distance-limiting sliding screw for a femoral neck is provided, which comprises an inner core, wherein the head of the inner core is provided with a first external thread; the tail part of the outer sleeve is provided with a second external thread, the thread pitch of the second external thread is different from that of the first external thread, the tail part of the inner core is connected with the head part of the outer sleeve through a connecting structure and can axially slide relatively, and the outer sleeve is provided with a distance limiting structure so as to limit the relative sliding distance between the inner core and the outer sleeve; and the connecting part is arranged at the tail part of the outer sleeve.
The bidirectional pressurizing distance-limiting sliding screw for the femoral neck at least has the following beneficial effects: the first external thread of the inner core and the second external thread of the outer sleeve can enable the fractured end of the femoral neck to play a role of bidirectional pressurization in the process of entering the proximal end of the femur, so that the stability of the fractured end of the femur is improved; the combination of the inner core and the outer sleeve allows the inner core to have relative sliding movement, and the distance limiting structure prevents excessive sliding and maintains the length of the femoral neck while promoting healing of the fractured end of the femoral neck.
According to an embodiment of the first aspect of the present invention, the connecting structure includes a shaft hole provided in a head portion of the outer sleeve, the shaft hole being arranged along a central axis direction of the outer sleeve, and the inner core has a slide rod fitted into the shaft hole to be axially slidable.
According to an embodiment of the first aspect of the present invention, the side wall of the shaft hole has at least one limit plane to limit the rotation of the slide lever.
According to an embodiment of the first aspect of the present invention, the shaft hole has a hexagonal cross section, and the sliding rod has a hexagonal prism shape, and is axially slidable in cooperation with the shaft hole.
According to an embodiment of the first aspect of the present invention, the tail portion of the outer sleeve is provided with an accommodating cavity communicated with the shaft hole, the sliding rod passes through the shaft hole and then is placed into the accommodating cavity, the sliding rod is provided with a limited component located in the accommodating cavity, and the distance limiting structure limits the relative sliding distance between the inner core and the outer sleeve by limiting the limited component.
According to the embodiment of the first aspect of the present invention, the accommodating cavity is open, an outer tail cap is installed at the opening of the accommodating cavity, the distance limiting structure includes a first limiting surface and a second limiting surface which are respectively arranged at two ends of the accommodating cavity, the first limiting surface and the second limiting surface are respectively used for limiting two ends of the limited component, the first limiting surface is arranged at one end of the accommodating cavity close to the shaft hole, and the second limiting surface is an inner end surface of the outer tail cap.
According to the embodiment of the first aspect of the present invention, the limited assembly includes a check ring sleeved on the sliding rod, the first limiting surface is used for limiting the stroke of the check ring, the limited assembly further includes a third limiting surface formed at the tail end of the sliding rod, and the second limiting surface is used for limiting the stroke of the tail end of the sliding rod.
According to an embodiment of the first aspect of the present invention, the limited assembly includes an inner tail cap limited in the accommodating cavity to move, the inner tail cap is in threaded connection with the tail of the sliding rod, and the first limiting surface and the second limiting surface are respectively used for limiting two ends of the inner tail cap.
According to an embodiment of the first aspect of the present invention, the connecting portion is an internal thread provided at the opening of the accommodating chamber, and the outer tail cap is screwed on the internal thread.
According to an embodiment of the second aspect of the invention, a screwdriver is provided, which is used with the femoral neck bidirectional compression distance-limiting sliding screw of the embodiment of the first aspect of the invention, and comprises an outer sleeve connecting rod, wherein the outer sleeve connecting rod is used for being connected with the connecting part and is hollow; the inner core connecting rod is provided with a screwdriver head used for rotating the outer tail cap, the inner core connecting rod penetrates through the outer sleeve connecting rod and then extends out, and the inner core connecting rod is rotatably connected with the outer sleeve connecting rod.
The screwdriver at least has the following beneficial effects: when the nail is placed, the screwdriver head of the inner core connecting rod can screw out the outer tail cap, the outer sleeve connecting rod is connected with the outer sleeve through the connecting part, so that the outer tail cap and the two-way pressurizing distance-limiting sliding screw of the femoral neck are connected into a whole, the handle of the screwdriver is grasped to screw in the two-way pressurizing distance-limiting sliding screw of the femoral neck along the direction of the guide pin, after the femur is placed, the outer sleeve connecting rod is rotated, the screwdriver and the two-way pressurizing distance-limiting sliding screw of the femoral neck can be separated, and then the outer tail cap is screwed into the outer sleeve. The screwdriver can complete the operation of a plurality of parts, and is high in practicability.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
FIG. 1 is a front view of a femoral neck bi-directional compression distance-limited sliding screw according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a perspective view of a bi-directional compression distance limited slide screw for a femoral neck according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view B-B of FIG. 3;
FIG. 5 is an exploded perspective view of a bi-directional compression distance limited slide screw for a femoral neck according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view C-C of FIG. 5;
fig. 7 is a cross-sectional view of a screwdriver according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
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, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in 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 and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring now to fig. 1 and 2, a femoral neck bi-directional compression distance-limited slide screw according to a first embodiment of the present invention will be described, and referring now to fig. 3-6, a femoral neck bi-directional compression distance-limited slide screw according to a second embodiment of the present invention will be described.
The femoral neck bidirectional compression distance-limiting sliding screw of the first embodiment comprises:
as shown in fig. 1 and 2, the femoral neck bidirectional compression distance-limiting sliding screw according to the embodiment of the present invention includes an inner core 11, an outer sleeve 21, and a connecting part disposed at a tail portion of the outer sleeve 21. The head of the inner core 11 is provided with a first external thread 13, the tail of the outer sleeve 21 is provided with a second external thread 22, and the thread pitch of the second external thread 22 is different from that of the first external thread 13.
As shown in figure 2, the tail part of the inner core 11 is connected with the head part of the outer sleeve 21 through a connecting structure and can slide relatively to the axial direction, and the outer sleeve 21 is provided with a distance limiting structure so as to limit the sliding distance of the inner core 11 and the outer sleeve 21 relatively.
Specifically, the coupling structure includes a shaft hole provided at the head of the outer sleeve 21, the shaft hole being arranged in the direction of the central axis of the outer sleeve 21, and the inner core 11 has a slide rod 12 fitted into the shaft hole to be axially slidable. The first external thread 13 of the inner core 11 and the second external thread 22 of the outer sleeve 21 are in a double-thread structure, and in the process of entering the proximal end of the femur, the fractured end of the femoral neck can be subjected to a bidirectional pressurization effect, so that the stability of the fractured end is improved. In addition, the inner core 11 and the outer sleeve 21 are connected by a connecting structure, the combination of the two structures enables the inner core 11 to have relative sliding movement, and the distance limiting structure can prevent excessive sliding, promote the healing of the broken end of the femoral neck and simultaneously maintain the length of the femoral neck.
In order to prevent relative change of the radial positions of the inner core 11 and the outer sleeve 21, the side wall of the shaft hole has at least one limit plane to limit the rotation of the sliding rod 12. Specifically, the present embodiment adopts a mode that the cross section of the shaft hole is hexagonal, the sliding rod 12 is hexagonal prism-shaped, and the sliding rod 12 is matched with the shaft hole to slide axially. The sliding rod 12 is clearance fitted to the shaft hole so that both the inner core 11 and the outer sleeve 21 have coaxial, synchronous rotational movement.
With reference to fig. 2, the tail of the outer sleeve 21 is provided with an accommodating cavity 23 communicated with the shaft hole, the sliding rod 12 passes through the shaft hole and then is placed in the accommodating cavity 23, the sliding rod 12 is provided with a limited component located in the accommodating cavity 23, and the distance limiting structure limits the limited component, so that the relative sliding distance between the inner core 11 and the outer sleeve 21 is limited.
Hold the chamber 23 uncovered, wherein, hold the chamber 23 uncovered department and install outer tail cap 41, the limit distance structure is including establishing respectively at the spacing face of first spacing face 24 and the second that holds chamber 23 both ends, and first spacing face 24 and the spacing face of second are used for respectively spacing by the both ends of limit subassembly, and first spacing face 24 sets up the one end of holding chamber 23 near the shaft hole, and the spacing face of second is the interior terminal surface of outer tail cap 41.
In the first embodiment, the limited component includes a retainer ring 32 sleeved on the sliding rod 12, the first limiting surface 24 is used for limiting the stroke of the retainer ring 32, the limited component further includes a third limiting surface formed at the tail end of the sliding rod 12, and the second limiting surface is used for limiting the stroke of the tail end of the sliding rod 12. It will be appreciated that the inner core 11 slides away from the outer sleeve 21, the stop ring 32 limiting the travel of the inner core 11; the inner core 11 slides towards the outer sleeve 21, the second limiting surface of the outer tail cap 41 limits the stroke of the inner core 11, the relative sliding distance between the inner core 11 and the outer sleeve 21 is limited within a certain range, and according to the structure of the femoral neck, in the embodiment, the distance limiting structure limits the sliding range of the inner core 11 to be 5mm, so that the healing of the broken end of the femoral neck is promoted, and the length of the femoral neck is also maintained.
The two-way compression distance-limited sliding screw of the femoral neck of the second embodiment:
referring to fig. 3 to 6, a bidirectional compression distance-limiting sliding screw for a femoral neck is shown according to a second embodiment, which is different from the first embodiment in the specific mechanism of the limited component, the limited component of the second embodiment includes an inner tail cap 31 limited in the accommodating cavity 23 to move, the inner tail cap 31 is in threaded connection with the tail of the sliding rod 12, and the first limiting surface 24 and the second limiting surface are respectively used for limiting two ends of the inner tail cap 31. It can be understood that, interior tail cap 31 adopts for hexagon socket head cap, and interior tail cap 31 head external diameter is not less than the diameter of the circumcircle of shaft hole to the formation holds the first spacing face 24 of chamber 23, and the confession interior tail cap 31 supports to lean on, the unable roll-off of slide bar 12 of being connected with interior tail cap 31. The holding cavity 23 is a cylindrical cavity, the outer diameter of the head of the inner tail cap 31 is slightly smaller than the diameter of the holding cavity 23, so that the inner tail cap 31 can extend into the holding cavity 23 through the tail of the outer sleeve 21 and is connected with the sliding rod 12 of the inner core 11. In this embodiment, the inner tail cap 31 is limited in stroke by the first and second limiting surfaces 24 and 21, and the sliding distance between the inner core 11 and the outer sleeve 21 is limited within a certain range, and according to the structure of the femoral neck, in this embodiment, the distance limiting structure limits the sliding range of the inner core 11 to 5mm, so as to promote the healing of the broken end of the femoral neck and maintain the length of the femoral neck.
As another modification of the second embodiment, referring to fig. 4, the head of the sliding rod 12 is provided with a distance limiting detent 14 for pressing against the end of the outer sleeve 21 to limit the sliding stroke of the sliding rod 12. It will be appreciated that the inner core 11 slides towards the outer sleeve 21 and that when the end of the outer sleeve 21 abuts the distance limit detent 14, the inner core 11 cannot slide any further. The inner core 11 slides away from the direction of the outer sleeve 21, and the inner tail cap 31 limits the stroke of the inner core 11; the inner core 11 slides towards the outer sleeve 21, the distance limiting position 14 limits the stroke of the inner core 11, and at the moment, the stroke of the inner core 11 in the other direction is not limited by the second limiting surface.
As a further improvement of the two embodiments, in conjunction with fig. 2 and 4, the connecting portion is an internal thread disposed at the opening of the accommodating chamber 23, and the outer tail cap 41 is screwed on the internal thread. During the process of placing the screw of the femoral neck bidirectional pressurizing distance-limiting sliding screw, the screwdriver can be connected with the outer sleeve 21 through the connecting part. The internal thread is screwed with an external tail cap 41, which can prevent soft tissues from entering the accommodating cavity 23 of the external sleeve 21 so as to avoid influencing subsequent nail taking.
Referring to fig. 7, a screwdriver according to an embodiment of the present invention will be described.
Referring to fig. 7, a screwdriver according to an embodiment of the present invention is used with the above-mentioned bi-directional compression distance-limited sliding screw for femoral neck, and comprises an outer sleeve connecting rod 54 and a core connecting rod 52, wherein the end of the core connecting rod 52 is provided with a handle 51, and the head of the core connecting rod 52 is provided with a bit 53 for screwing the outer tail cap 41.
Outer sleeve connecting rod 54 is cavity, and inner core connecting rod 52 stretches out after passing outer sleeve connecting rod 54, and inner core connecting rod 52 rotates with outer sleeve connecting rod 54 to be connected, specifically realizes through swivelling joint portion 55, installs pressure spring 56 in swivelling joint portion 55, and outer sleeve connecting rod 54 can move towards screwdriver head 53 direction slightly promptly, and swivelling joint portion 55 is common structure in screwdriver five metals field, and this is no longer repeated.
The outer sleeve connecting rod 54 is used for connecting with the connecting part, and particularly the head of the outer sleeve connecting rod 54 is provided with a third external thread matched with the internal thread at the opening of the accommodating cavity 23.
By adopting the screwdriver provided by the embodiment of the invention, the nail placing process of the femoral neck bidirectional pressurizing distance-limiting sliding screw is as follows:
before the operation, the screw inserting direction and depth are firstly fixed through the guide pin, like the hollow screw nail placement, the minimally invasive operation is simple. The length of the inner core 11 is fixed, the length of the outer sleeve 21 is designed into various specifications and is selected according to requirements, and the length of the outer sleeve 21 determines the length of the femoral neck bidirectional pressurizing distance-limiting sliding screw.
The femoral neck bidirectional pressurizing distance-limiting sliding screw according to the first embodiment is characterized in that the inner core 11 and the outer sleeve 21 are assembled in vitro, the outer sleeve 21 is selected to be a proper one, the inner core 11 and the outer sleeve 21 are all hollow structures, the sliding rod 12 of the inner core 11 is inserted into the shaft hole of the outer sleeve 21, and the retainer ring 32 is clamped into the shaft groove of the sliding rod 12. The two-way pressurization distance-limiting sliding screw for the femoral neck in the second embodiment is characterized in that the inner core 11, the outer sleeve 21 and the inner tail cap 31 are assembled outside the body, the outer sleeve 21 is selected to be a suitable hollow structure, the sliding rod 12 of the inner core 11 is inserted into the shaft hole of the outer sleeve 21, the inner tail cap 31 extends into the shaft hole from the tail end of the outer sleeve 21, the inner tail cap 31 and the sliding rod 12 are connected in the accommodating cavity 23, the inner hexagon specification of the inner tail cap 31 can be designed to be the same as the inner hexagon specification of the outer tail cap 41, and the inner tail cap can be rotated by the same batch.
The outer sleeve connecting rod 54 is rotated clockwise, the third external thread of the outer sleeve connecting rod 54 of the screwdriver is screwed into the accommodating cavity 23 of the outer sleeve 21, so that the screwdriver and the two-way compression distance-limiting sliding screw of the femoral neck are connected into a whole, and then the two-way compression distance-limiting sliding screw of the femoral neck is screwed in the direction of the guide pin.
After the bi-directional compression distance-limiting sliding screw for the femoral neck is inserted into the femur, the handle 51 is held by one hand, and the outer sleeve connecting rod 54 is rotated counterclockwise by the other hand, so that the screwdriver and the bi-directional compression distance-limiting sliding screw for the femoral neck are unlocked and separated, and then the outer tail cap 41 is screwed into the internal thread at the opening of the accommodating cavity 23 through the inner core connecting rod 52 of the screwdriver.
In the above, when the first external thread 13 of the inner core 11 passes through the fracture line of the femoral neck, the bidirectional compression distance-limiting sliding screw of the femoral neck exerts axial compression on the femoral head, and since the pitch of the second external thread 22 of the outer sleeve 21 is smaller than that of the first external thread 13, bidirectional compression is exerted on the fractured end when the second external thread 22 of the outer sleeve 21 enters the lateral cortex of the femur. The two-way pressurization distance-limiting sliding screw for the femoral neck enters the proximal end of the femoral neck in the form of the longest screw, and the inner core 11 can slide in the healing and absorption process of the fractured end of the inner core 11 with a half-thread structure, so that the fractured ends of the femoral neck are in mutual contact conveniently, therefore, the necrotic absorptive gap is eliminated, and the fracture healing is promoted.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The utility model provides a two-way pressurization limit for a distance slide screw of femoral neck which characterized in that: comprises that
The inner core (11), the head of the inner core (11) is provided with a first external thread (13);
the tail part of the outer sleeve (21) is provided with a second external thread (22), the thread pitch of the second external thread (22) is different from that of the first external thread (13), the tail part of the inner core (11) is connected with the head part of the outer sleeve (21) through a connecting structure and can axially slide relatively, and the outer sleeve (21) is provided with a distance limiting structure so as to limit the relative sliding distance of the inner core (11) and the outer sleeve (21); and
and the connecting part is arranged at the tail part of the outer sleeve (21).
2. The femoral neck bi-directional compression distance-limited slide screw of claim 1, wherein: the connecting structure comprises a shaft hole arranged at the head part of the outer sleeve (21), the shaft hole is arranged along the central shaft direction of the outer sleeve (21), and the inner core (11) is provided with a sliding rod (12) which is arranged in the shaft hole so as to realize axial sliding.
3. The femoral neck bi-directional compression distance-limited slide screw of claim 2, wherein: the side wall of the shaft hole is provided with at least one limit plane to limit the rotation of the sliding rod (12).
4. The femoral neck bi-directional compression distance-limited slide screw of claim 3, wherein: the cross-section in shaft hole is the hexagon, slide bar (12) are hexagonal prism form, slide bar (12) with the shaft hole cooperation axial is slided.
5. The femoral neck bi-directional compression distance-limited sliding screw according to any one of claims 2 to 4, wherein: the tail of the outer sleeve (21) is provided with an accommodating cavity (23) communicated with the shaft hole, the sliding rod (12) penetrates through the shaft hole and then is placed into the accommodating cavity (23), the sliding rod (12) is provided with a limited component located in the accommodating cavity (23), and the distance limiting structure limits the relative sliding distance between the inner core (11) and the outer sleeve (21) by limiting the limited component.
6. The femoral neck bi-directional compression distance-limited slide screw of claim 5, wherein: it is uncovered to hold chamber (23), hold chamber (23) uncovered department and install outer tail cap (41), the limit distance structure is including establishing separately hold first spacing face (24) and the spacing face of second at chamber (23) both ends, first spacing face (24) with the spacing face of second is used for right respectively spacing by the both ends of limit subassembly, first spacing face (24) set up hold chamber (23) and be close to the one end in shaft hole, the spacing face of second does the interior terminal surface of outer tail cap (41).
7. The femoral neck bi-directional compression distance-limited slide screw of claim 6, wherein: the limited assembly comprises a check ring (32) sleeved on the sliding rod (12), the first limiting surface (24) is used for limiting the stroke of the check ring (32), the limited assembly further comprises a third limiting surface formed at the tail end of the sliding rod (12), and the second limiting surface is used for limiting the stroke of the tail end of the sliding rod (12).
8. The femoral neck bi-directional compression distance-limited slide screw of claim 6, wherein: the limited assembly comprises an inner tail cap (31) limited in the containing cavity (23) and capable of moving, the inner tail cap (31) is in threaded connection with the tail of the sliding rod (12), and the first limiting surface (24) and the second limiting surface are used for limiting two ends of the inner tail cap (31) respectively.
9. The femoral neck bi-directional compression distance-limited slide screw of claim 6, wherein: the connecting part is an internal thread arranged at the opening of the accommodating cavity (23), and the outer tail cap (41) is screwed on the internal thread.
10. A screwdriver used with the femoral neck bi-directional compression distance-limited sliding screw of claim 9, wherein: comprises that
An outer sleeve connecting rod (54), wherein the outer sleeve connecting rod (54) is used for being connected with the connecting part, and the outer sleeve connecting rod (54) is hollow; and
the inner core connecting rod (52) is provided with a screwdriver head (53) used for rotating the outer tail cap (41), the inner core connecting rod (52) penetrates through the outer sleeve connecting rod (54) to extend out, and the inner core connecting rod (52) is rotatably connected with the outer sleeve connecting rod (54).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011615463.0A CN112790849A (en) | 2020-12-30 | 2020-12-30 | Two-way pressurization limit for a distance slip screw of thighbone neck and screwdriver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011615463.0A CN112790849A (en) | 2020-12-30 | 2020-12-30 | Two-way pressurization limit for a distance slip screw of thighbone neck and screwdriver |
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| CN112790849A true CN112790849A (en) | 2021-05-14 |
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| CN202011615463.0A Pending CN112790849A (en) | 2020-12-30 | 2020-12-30 | Two-way pressurization limit for a distance slip screw of thighbone neck and screwdriver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113893018A (en) * | 2021-09-16 | 2022-01-07 | 上海市第六人民医院 | Tension screw for femoral neck fracture and use method thereof |
| CN115607253A (en) * | 2022-12-12 | 2023-01-17 | 北京天智航医疗科技股份有限公司 | Internal fixing screw for femoral neck |
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| JP2002360599A (en) * | 2001-06-05 | 2002-12-17 | Ikushi Yamada | Screw for bone coapatation having escape preventive function |
| FR2860420A1 (en) * | 2003-10-03 | 2005-04-08 | Surfic Technologies | Osteosynthesis device for repairing or compacting femur bone, has guiding unit mounted on osteosynthesis connection unit in removable manner and, after installation, guiding anchor unit in translation |
| FR2860420B1 (en) * | 2003-10-03 | 2006-06-02 | Surfic Technologies | OSTEOSYNTHESIS DEVICE |
| CN201684012U (en) * | 2010-06-03 | 2010-12-29 | 张春雷 | Limited dynamic hip screw |
| CN211460473U (en) * | 2019-05-29 | 2020-09-11 | 大博医疗科技股份有限公司 | Telescopic device |
| CN211658308U (en) * | 2019-09-11 | 2020-10-13 | 杨惠林 | Combined pressurizing locking screw and matched screwdriver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113893018A (en) * | 2021-09-16 | 2022-01-07 | 上海市第六人民医院 | Tension screw for femoral neck fracture and use method thereof |
| CN115607253A (en) * | 2022-12-12 | 2023-01-17 | 北京天智航医疗科技股份有限公司 | Internal fixing screw for femoral neck |
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