CN118902582B - Multi-shaft nail and nail rod system - Google Patents
Multi-shaft nail and nail rod system Download PDFInfo
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- CN118902582B CN118902582B CN202410984850.3A CN202410984850A CN118902582B CN 118902582 B CN118902582 B CN 118902582B CN 202410984850 A CN202410984850 A CN 202410984850A CN 118902582 B CN118902582 B CN 118902582B
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- 241001079814 Symphyotrichum pilosum Species 0.000 title claims abstract description 19
- 235000004224 Typha angustifolia Nutrition 0.000 title claims abstract description 19
- 230000000399 orthopedic effect Effects 0.000 claims abstract description 113
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 49
- 230000000670 limiting effect Effects 0.000 claims description 24
- 230000006835 compression Effects 0.000 claims description 22
- 238000007906 compression Methods 0.000 claims description 22
- 230000003014 reinforcing effect Effects 0.000 claims description 16
- 239000013013 elastic material Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 230000036544 posture Effects 0.000 description 6
- 101150014715 CAP2 gene Proteins 0.000 description 3
- 101100326803 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) fac-2 gene Proteins 0.000 description 3
- 239000002639 bone cement Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- MTHLBYMFGWSRME-UHFFFAOYSA-N [Cr].[Co].[Mo] Chemical compound [Cr].[Co].[Mo] MTHLBYMFGWSRME-UHFFFAOYSA-N 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Neurology (AREA)
- Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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Abstract
本发明提出了一种多轴钉及钉棒系统，包括万向钉帽、压帽、骨锚和止推环，其中，万向钉帽的内部由一端至另一端，依次设置有内螺纹、第一内孔和第二内孔，万向钉帽沿径向开设有槽口；在矫形棒的轴向上，第一内孔经槽口截断；在与矫形棒的轴向垂直相交的方向上，第一内孔的内径小于第二内孔的内径；第二内孔在矫形棒的轴向上的内径，大于与矫形棒的轴向垂直相交的方向上的内径；压帽滑动设置在第一内孔和第二内孔内；骨锚的一端设置有球头，且球头设置在万向钉帽的内部；压帽和止推环相对的位于球头的两侧。本发明中的压帽具有良好的定位效果和结构强度，其与矫形棒进行锁止固定后，不易出现组件滑脱位移的问题，以此可显著降低钉棒系统的失效风险。
The present invention proposes a multi-axis nail and nail rod system, including a universal nail cap, a pressure cap, a bone anchor and a thrust ring, wherein the interior of the universal nail cap is sequentially provided with an internal thread, a first inner hole and a second inner hole from one end to the other end, and the universal nail cap is provided with a notch in the radial direction; in the axial direction of the orthopedic rod, the first inner hole is cut off by the notch; in the direction perpendicular to the axial direction of the orthopedic rod, the inner diameter of the first inner hole is smaller than the inner diameter of the second inner hole; the inner diameter of the second inner hole in the axial direction of the orthopedic rod is larger than the inner diameter in the direction perpendicular to the axial direction of the orthopedic rod; the pressure cap is slidably arranged in the first inner hole and the second inner hole; a ball head is arranged at one end of the bone anchor, and the ball head is arranged inside the universal nail cap; the pressure cap and the thrust ring are relatively located on both sides of the ball head. The pressure cap in the present invention has good positioning effect and structural strength, and after being locked and fixed with the orthopedic rod, it is not easy to have the problem of component slippage and displacement, thereby significantly reducing the failure risk of the nail rod system.
Description
Technical Field
The invention relates to the technical field of medical devices, in particular to a multi-shaft nail and a nail rod system.
Background
Bone correction pin systems are medical devices for the treatment and correction of skeletal deformities or fractures, which generally include polyaxial pins and orthopedic rods. When the multi-shaft nail is used, holes are formed in the bones of a patient, then the multi-shaft nails are installed, after the postures of the multi-shaft nails are adjusted, the orthopedic rods are placed on the multi-shaft nails, then the bones are stretched and corrected, the orthopedic rods are locked on the multi-shaft nails by the screws to fix the bones, and usually, bone cement is injected into the bones to ensure the stability of the structure.
The prior art publication CN1371258a discloses a bottom loaded multi-axial bone-riveting device comprising a receiver, a crown, a bone anchor and a retainer. The receiver defines upper and lower openings, channels and grooves that may form part of the same opening. The crown and bone anchor are fitted into the lower opening of the receiver and the retainer fits into the channel of the receiver around the bone anchor.
Another patent application, published under number CN116940292a, discloses a bone anchor assembly that provides a single bone anchor assembly. The present bone anchor assembly includes an implantable stem and a receiver member having two spaced apart arms that form a U-shaped seat to receive a rod, among other components.
In the above technical solution, the crown in CN1371258a and the compression cap in CN116940292a serve the same function, and are used for fixing the orthopedic rod and the bone anchor. However, the crown part in CN1371258A has a planar structure, the friction force formed after the crown part contacts with the orthopedic rod is small, the screw loosening and the component displacement are easy to occur, the compression cap in CN116940292A has a cap rod slot at the top, but has an equal diameter structure, the compression cap is required to be provided with a screwless part with the corresponding size of the compression cap for sliding, and meanwhile, a large notch is required to be reserved between the spaced arms for installing the orthopedic rod, so that the overall strength of the receiving part is reduced, the reliability is reduced, and the component of the skeletal correcting nail rod system is easy to produce slipping displacement when a patient moves.
Disclosure of Invention
In view of the above, the invention provides a multi-shaft nail and a nail rod system with stable structure and difficult component slipping and dislocation, thereby solving the problem that the existing nail rod system is easy to cause component slipping and displacement.
The technical scheme of the invention is realized as follows:
in one aspect, the invention provides a multi-axial nail comprising a universal nail cap, a press cap, a bone anchor and a thrust collar, wherein,
The universal nail cap is of a cylindrical structure, the inner part of the universal nail cap is sequentially provided with an internal thread, a first inner hole and a second inner hole from one end to the other end, the universal nail cap is provided with a notch along the radial direction, and the notch is used for installing an orthopedic rod;
In the axial direction of the orthopedic rod, the inner diameter of the first inner hole is cut off by the notch, and in the direction perpendicularly intersecting with the axial direction of the orthopedic rod, the inner diameter of the first inner hole is smaller than the inner diameter of the second inner hole;
the second inner hole has an inner diameter in the axial direction of the orthopedic rod that is larger than an inner diameter in a direction perpendicularly intersecting the axial direction of the orthopedic rod;
the pressing cap is arranged in the first inner hole and the second inner hole in a sliding manner, and the pressing cap partially extends into the notch;
One end of the bone anchor is provided with a ball head which is arranged in the universal nut;
the pressing cap and the thrust ring are oppositely arranged at two sides of the ball head so as to limit the bone anchor.
On the basis of the technical proposal, the universal nail cap also preferably comprises a gasket, a third inner hole is arranged on the universal nail cap, wherein,
The third inner hole is formed in one side, far away from the first inner hole, of the second inner hole, and the inner diameter of the third inner hole is larger than that of the second inner hole in the direction perpendicularly intersecting with the axial direction of the orthopedic rod;
the second inner hole and the third inner hole have the same inner diameter in the axial direction of the orthopedic rod;
the gasket is arranged in the third inner hole, the gasket abuts against the pressing cap and the thrust ring, and the gasket is made of elastic materials.
On the basis of the technical scheme, preferably, the gasket is of an annular structure, and the inside of the gasket is provided with reinforcing ribs;
the reinforcing ribs are of annular structures, and a plurality of reinforcing ribs are arranged along the axial direction of the gasket;
One end of the ball head, which faces the press cap, is provided with a plurality of step platforms.
On the basis of the technical proposal, the press cap preferably comprises a first inserting section and a second inserting section, wherein,
The first inserting section is provided with a limiting groove and comprises an arc-shaped part inserted in the first inner hole and plane parts positioned at two sides of the arc-shaped part, and the plane parts are propped against the inner wall of the notch;
The second inserting section and the first inserting section are of an integrated structure, the second inserting section is inserted into the second inner hole and the third inner hole, and the second inserting section abuts against the ball head.
In another aspect, the present invention provides a rod system comprising the multi-axial pin described above.
On the basis of the technical proposal, the utility model preferably further comprises a screw and a connecting piece, wherein,
The screw is connected with the internal thread of the universal nut and presses the orthopedic rod;
the connecting piece is arranged on the screw and is connected with the orthopedic rod so as to realize the circumferential, radial and axial limit of the orthopedic rod relative to the universal nut.
Based on the above technical solution, preferably, the orthopedic rod includes a shell and an inner core, wherein,
The shell is an arc-shaped shell, the shell penetrates through the notch, and the opening of the shell faces the screw;
The inner core is arranged in the shell, and the inner core is made of elastic materials.
On the basis of the technical scheme, preferably, the connecting piece is a threaded column, the threaded column is of a conical structure, the threaded column is arranged on the screw, and the threaded column penetrates through the opening of the shell and is in threaded fit with the inner core.
On the basis of the technical proposal, preferably, the connecting piece comprises a compression ring and a limiting rod, wherein,
The compression ring is rotatably arranged on the screw, and a compression groove is formed in one end, far away from the screw, of the compression ring;
the limiting rod is connected with the compression ring and is positioned in the compression groove;
The limiting rod penetrates through the opening of the shell and abuts against the inner core.
On the basis of the technical scheme, the universal nail cap is preferably provided with a limit block, the limit block is arranged on the outer wall of the orthopedic rod, and the limit block is embedded with the limit block.
Compared with the prior art, the multi-shaft nail and nail rod system has the following beneficial effects:
(1) The inner hole of the universal nut is of a stepped hole structure, the part of the pressing nut extends into the notch of the universal nut, and the second inner hole and the third inner hole are of an equal-diameter structure in the axial direction of the orthopedic rod, so that after the pressing nut adapting to the shape of the inner hole of the universal nut is assembled into the universal nut, the pressing nut can have a larger area to be contacted with the orthopedic rod, the friction force between the pressing nut and the orthopedic rod is larger, good positioning effect and structural strength are achieved, the problem of component slipping displacement is not easy to occur, and the failure risk of a nail rod system can be remarkably reduced;
(2) The third inner hole is formed in the universal nut, and the gasket is arranged in the third inner hole, so that after the universal nut turns relative to the bone anchor, good friction force can be kept all the time by virtue of the gasket, and the position of the universal nut relative to the bone anchor is ensured to be stable;
(3) The reinforcing ribs are arranged in the gasket, and the plurality of stepped platforms are arranged on the ball head, so that the position stability can be further improved by means of the cooperation of the edges of the ball head and the gasket, and meanwhile, the reinforcing ribs can ensure the structural strength of the gasket;
(4) The pressing cap is arranged to be the first inserting section and the second inserting section, so that the whole pressing cap is of a ladder cylindrical structure, positioning is convenient when the pressing cap is assembled to the universal nail cap, the plane part of the first inserting section extends into the notch and abuts against the inner wall of the notch, and the pressing cap has a large area and is contacted with the orthopedic rod, so that friction force can be improved, and the position of the orthopedic rod after locking is stable;
(5) The orthopedic rod is arranged into the shell and the inner core, and the screw is provided with the threaded column matched with the inner core, so that the connection stability of the screw and the orthopedic rod can be further improved, the positioning of the orthopedic rod is fully realized, the problems of axial movement and circumferential rotation of the orthopedic rod are avoided, meanwhile, the threaded column is of a conical structure, and the threaded column expands the opening of the shell along with the screwing of the screw, so that the shell fully supports against the notch of the pressure cap and the universal nut, and the assembly stability is further improved;
(6) Through set up clamping ring and gag lever post on the screw, so when the screw was screwed, accessible clamping ring pressed tightly the casing of orthopedic stick, and the inner core of orthopedic stick is compressed, and the opening of casing is relative drawing together to this can centre gripping gag lever post, thereby improve the stability that screw and orthopedic stick are connected, with make orthopedic stick be difficult for breaking away from the universal nut, guarantee application stability.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of a multi-axial nail of the present invention;
FIG. 2 is a front view of the multi-axial pin of the present invention;
FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2 in accordance with the present invention;
FIG. 4 is a side view of the multi-axial pin of the present invention;
FIG. 5 is a cross-sectional view taken along the direction B-B in FIG. 4 in accordance with the present invention;
FIG. 6 is an exploded view of the multi-axial pin of the present invention;
FIG. 7 is a perspective view of the universal nut of the multi-axial pin of the present invention;
FIG. 8 is a cross-sectional view of the universal nut of the multi-axial pin of the present invention;
FIG. 9 is a second view cross-section of the universal nut of the multi-axial pin of the present invention;
FIG. 10 is a perspective view of the press cap of the multi-axial pin of the present invention;
FIG. 11 is a perspective view of the spike system of the present invention;
FIG. 12 is a front view of a single multi-axial pin of the pin rod system of the present invention;
FIG. 13 is a cross-sectional view taken along the direction C-C in FIG. 12 in accordance with the present invention;
FIG. 14 is a side view of a single multi-axial pin of the pin rod system of the present invention;
FIG. 15 is a cross-sectional view taken along the direction D-D in FIG. 14 in accordance with the present invention;
FIG. 16 is a schematic illustration of a split block diagram of a universal nut and orthopedic rod of the nail rod system of the present invention;
FIG. 17 is a schematic view of the orthopedic rod and screw separation of the rod system of the present invention;
FIG. 18 is a block diagram of the assembly of the connector of the present invention with a threaded post;
FIG. 19 is a block diagram of the assembly of the connector of the present invention with a compression ring and a stop lever;
FIG. 20 is a cross-sectional view of a segmented core arrangement in an orthopedic rod of the rod system of the present invention;
In the figure, 1, a universal nut, 101, an internal thread, 102, a first inner hole, 103, a second inner hole, 104, a third inner hole, 105, a notch, 106, a caulking groove, 2, a press cap, 21, a first inserting section, 211, an arc-shaped part, 212, a plane part, 22, a second inserting section, 201, a limit groove, 3, a bone anchor, 31, a ball head, 32, a stepped platform, 4, a thrust ring, 5, a gasket, 51, a reinforcing rib, 6, an orthopedic rod, 61, a shell, 62, an inner core, 601, an anti-skid pattern, 7, a screw, 8, a threaded post, 9, a compression ring, 901, a pressing groove, 10, a limit rod, 11 and a limit block.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
As shown in fig. 1 to 20, the multi-shaft nail comprises a universal nail cap 1, a press cap 2, a bone anchor 3, a thrust ring 4, a gasket 5 and an orthopedic rod 6;
the nail rod system comprises the multi-shaft nail, and further comprises a screw 7, a threaded column 8, a compression ring 9, a limiting rod 10 and a limiting block 11.
As shown in fig. 1-9, the universal nut 1 is of a cylindrical structure, an internal thread 101, a first inner hole 102 and a second inner hole 103 are sequentially arranged from one end to the other end in the universal nut 1, a notch 105 is formed in the universal nut 1 along the radial direction and is used for installing an orthopedic rod 6, the first inner hole 102 is truncated through the notch 105 in the axial direction of the orthopedic rod 6, the inner diameter of the first inner hole 102 is smaller than the inner diameter of the second inner hole 103 in the direction perpendicular to the axial direction of the orthopedic rod 6, the inner diameter of the second inner hole 103 in the axial direction of the orthopedic rod 6 is larger than the inner diameter of the second inner hole 103 in the direction perpendicular to the axial direction of the orthopedic rod 6, a press cap 2 is arranged in the first inner hole 102 and the second inner hole 103 in a sliding mode and extends to the notch 105 partially, one end of the bone anchor 3 is provided with a ball head 31, the ball head 31 is arranged in the inner part of the universal nut 6, the press cap 2 and the thrust ring 4 are opposite to two sides of the ball head 31 to limit the bone anchor 3;
In the structure, when the universal screw cap is assembled, the press cap 2 is assembled into the universal screw cap 1, then the bone anchor 3 is placed, and then the thrust ring 4 is assembled for fixing, wherein the thrust ring 4 is arranged into a C-shaped ring, the inner part of the universal screw cap 1 is provided with a ring groove corresponding to the thrust ring 4, and the thrust ring 4 is compressed and then pushed into the ring groove, so that the ball head 31 of the bone anchor 3 can be locked;
The bone anchor 3 is used for connecting bones of a patient, then the universal nut 1 is subjected to posture adjustment, at the moment, the universal nut 1 rotates relative to the bone anchor 3 to realize direction adjustment, then the orthopedic rod 6 is assembled into the notch 105, the orthopedic rod 6 is locked by fasteners such as screws, plugs and the like, the orthopedic rod 6 applies pressure to the pressing cap 2, and the ball head 31 is pressed by the pressing cap 2 to realize fixation;
in this configuration, the second internal hole 103 for fitting the press cap2 is of unequal diameter construction, which has a greater width in the axial direction of the corresponding orthopedic rod 6, so that the corresponding press cap2 is configured to accommodate the shape of the second internal hole 103, i.e., the press cap2 has a greater wall thickness in the axial direction of the orthopedic rod 6;
Meanwhile, the part of the pressing cap 2 extends into the notch 105, so that the pressing cap 2 is stably supported by the universal nut 1, the pressing cap 2 and the orthopedic rod 6 have larger contact area, and the friction force is improved, so that after the orthopedic rod 6 is pressed by using a screw, a plug and other fasteners, the orthopedic rod 6 can be better limited, and the problem of component slip limitation is not easy to occur;
in the application process of the rod system, as shown in fig. 11, a plurality of multi-axis nails are generally arranged to fix the same orthopedic rod 6 to form a single rod system, then two rows of rod systems are arranged in parallel, and then transverse fixing pieces are arranged to connect the orthopedic rods in the two rod systems, so that a stable structure is realized.
Specifically, when the bone anchor 3 is fixed, bone cement can be injected into the bone to ensure the stability of the installation of the bone anchor 3, and meanwhile, the bone anchor 3 can be provided with an internal through hole which penetrates, so that the injection of the bone cement is convenient.
Specifically, the universal nut 1, the bone anchor 3 and the orthopedic rod 6 are made of cobalt-chromium-molybdenum materials.
Specifically, the bone anchor 3 is fixed by external threads, and the external threads adopt double-row threads with different pitches.
As shown in fig. 5-9, the universal nut 1 is provided with a third inner hole 104, wherein the third inner hole 104 is arranged on one side far away from the second inner hole 103, and the inner diameter of the third inner hole 104 is larger than the inner diameter of the second inner hole 103 in the direction perpendicular to the axial direction of the orthopedic rod 6, the inner diameters of the second inner hole 103 and the third inner hole 104 are the same in the axial direction of the orthopedic rod 6, a gasket 5 is arranged in the third inner hole 104, the gasket 5 abuts against the press cap 2 and the thrust ring 4, and the gasket 5 is made of elastic materials;
with the above structure, since the universal nut 1 needs to be rotated relative to the bone anchor 3 to adjust the posture at the time of correction, the washer 5 is provided to increase the friction force;
In this scheme, the third inner hole 104 is of an equal diameter structure, which is convenient for installing the gasket 5 and limiting the gasket 5 to ensure the stable position of the gasket 5, thereby realizing the enclasping of the ball head 31.
In some embodiments, the third inner bore 104 is also configured with an unequal diameter structure, specifically, based on the above-described scheme, the inner diameter of the third inner bore 104 in the axial direction of the orthopedic rod 6 is enlarged;
So after the gasket 5 is assembled into the third inner hole 104, the two sides of the gasket 5 can prop against the inner wall of the third inner hole 104 in the direction perpendicular to the axial direction of the orthopedic rod 6, and gaps are reserved between the two sides of the gasket 5 and the third inner hole 104 in the axial direction of the orthopedic rod 6, when the ball 31 of the bone anchor 3 rotates, the gasket 5 has a certain deformation space, thereby ensuring the convenience of adjusting the universal nut 1, and after the universal nut 1 is adjusted in place, the gasket 5 still holds the ball 31 tightly, so that the limiting effect of the universal nut 1 relative to the bone anchor 3 can be improved, and the orthopedic rod 6 is convenient to assemble subsequently;
In some embodiments, the inner diameter of the third bore 104 in a direction perpendicular to the axial intersection of the orthopedic rod 6 may also be enlarged.
In some embodiments, the surface of the ball 31 is provided with fine protrusions to better adapt to the gasket 5, thereby guaranteeing friction;
Specifically, if the distance between the end of the pressing cap 2 facing the thrust ring 4 and the thrust ring 4 is X1, the axial length of the washer 5 is set to be > X1, so that when the thrust ring 4 is assembled, the washer 5 is properly compressed by the thrust ring 4, the washer 5 can have a tensioning effect, so that the relative positioning of the universal nut 1 and the bone anchor 3 is ensured, and the universal nut 1 is not easy to deviate from a preset posture when the posture of the universal nut 1 is adjusted and the orthopedic rod 6 is installed.
As shown in fig. 5, the gasket 5 is of an annular structure, and the inside of the gasket 5 is provided with a reinforcing rib 51, the reinforcing rib 51 is of an annular structure, and a plurality of reinforcing ribs 51 are arranged along the axial direction of the gasket 5, and one end of the ball head 31, facing the press cap 2, is provided with a plurality of step platforms 32;
When the gasket 5 is arranged, the plurality of reinforcing ribs 51 are arranged in the gasket, the structural strength of the gasket can be ensured by virtue of the reinforcing ribs 51, and meanwhile, as the reinforcing ribs 51 are of annular structures and are axially arranged along the gasket 5, the plurality of reinforcing ribs 51 are not interfered with each other and can follow the extrusion of the ball head 31 to deform and displace, so that the universal nut 1 can be fully positioned relative to the ball head 31;
specifically, the ball head 31 is provided with a plurality of step platforms 32, so that friction force can be improved by means of the cooperation of edges of the step platforms 32 and the gasket 5, and the position stability of the universal nut 1 is further improved;
In some embodiments, the step 32 is replaced by a fine protrusion.
As shown in fig. 8-10, the press cap 2 comprises a first inserting section 21 and a second inserting section 22, wherein the first inserting section 21 is provided with a limit groove 201, the first inserting section 21 comprises an arc-shaped part 211 inserted in the first inner hole 102, and plane parts 212 positioned at two sides of the arc-shaped part 211, and the plane parts 212 are abutted against the inner wall of the notch 105;
the whole shape of the press cap 2 adapts to the shape of the inner hole of the universal nut 1, wherein the limit groove 201 on the first inserting section 21 is used for supporting the orthopedic rod 6 so as to initially position the orthopedic rod 6;
Specifically, in the first plugging section 21, the first plugging section 21 is provided with two parts of an arc-shaped part 211 and a plane part 212, wherein the arc-shaped part 211 is matched with the first inner hole 102, the plane part 212 extends into the notch 105 and abuts against the inner wall of the notch 105, and the structure increases the wall thickness of the first plugging section 21 in the axial direction of the orthopedic rod 6, so that the first plugging section 21 can stably abut against the orthopedic rod 6 and the friction force is increased;
Meanwhile, the structure also enables the notch 105 and the inner wall of the first inner hole 102 to be stably abutted against the first inserting section 21, after the orthopedic rod 6 is assembled, the orthopedic rod 6 is matched with the inner wall of the universal nut 1 to clamp the first inserting section 21, so that even if the wall thickness of the first inserting section 21 is thinner in the axial direction of the perpendicular orthopedic rod 6, the wall thickness of the first inserting section 21 is also good in application strength, and the problem of fracture is not easy to occur, so that the stability of the whole application is ensured.
As shown in fig. 11-19, the screw 7 is connected with the internal thread 101 of the universal nut 1 and presses the orthopedic rod 6, the connecting piece is arranged on the screw 7 and is connected with the orthopedic rod 6 to realize the circumferential, radial and axial limit of the orthopedic rod 6 relative to the universal nut 1;
According to the structure, the conventional nail rod system only presses and fixes the orthopedic rod 6 according to the fasteners such as the screws and the plugs, however, the risk of loosening and slipping of the assembly is easy to occur due to the factors such as movement of a patient, and therefore, in the screw 7 of the scheme, the connecting piece is further arranged to further fix the orthopedic rod 6, and the structure improves the integration of the screw 7 and the orthopedic rod 6 and reduces the risk of slipping;
When the screw 7 is used, the screw 7 is matched with the internal thread 101 of the universal screw cap 1, pressure is applied to the pressure cap 2 at the moment, and the pressure cap 2 applies pressure to the ball head 31 until the screw 7 is locked, so that the locking positioning of the assembly is realized.
As shown in fig. 12 and 13, the orthopedic rod 6 comprises a shell 61 and an inner core 62, wherein the shell 61 is an arc-shaped shell, the shell 61 passes through the notch 105, and the opening of the shell 61 faces the screw 7;
According to the structure, the orthopedic rod 6 is provided with the shell 61 and the inner core 62, the inner core 62 is made of elastic materials, the shell 61 is of an arc-shaped structure and is provided with an opening, so that when the screw 7 is locked, the shell 61 is slightly deformed, the inner core 62 can be compressed, the tensioning effect is realized by means of elastic force, and the screw 7 is better in holding effect and is less prone to loosening;
Specifically, the shell 61 and the inner core 62 are connected in a matched manner by adopting a reliable structure, for example, a bonding mode is adopted;
In some embodiments, as shown in fig. 20, the inner core 62 is not provided with a strip structure, but is provided with a plurality of block structures, the inner cores 62 with the block structures are arranged inside along the axial direction of the shell 61 at intervals, the gap between the inner core 62 and the inner core 62 is extended and filled by the shell 61, and when the inner core 62 is provided, the inner core 62 is formed by injection molding inside the shell 61, so that the axial limit of the inner core 62 relative to the shell 61 can be effectively realized, and the structure is more stable.
In some embodiments, the shell 61 is in a bamboo slip structure, that is, the shell 61 can be radially compressed and deformed under the support of the inner core 62, and the deformation is only reflected on the change of the inner diameters of the shell 61 and the inner core 62, but the shell has good structural strength in the axial direction, so that the problem of bone displacement is prevented.
To the structure setting of connecting piece, this scheme provides two kinds of structures:
First, as shown in fig. 18, the connecting piece is a threaded column 8, the threaded column 8 is in a cone structure, the threaded column 8 is arranged on the screw 7, and the threaded column 8 passes through the opening of the shell 61 and is in threaded fit with the inner core 62;
When the screw 7 is matched with the internal thread 101 for locking, the threaded column 8 passes through the opening of the shell 61 and is screwed with the inner core 62, so that the locking limit of the orthopedic rod 6 can be realized through the pressing force of the screw 7, and the axial and circumferential limit of the orthopedic rod 6 can be better realized by the matching of the threaded column 8 and the inner core 62;
Meanwhile, in the structure, as the threaded column 8 is in a conical structure, the threaded column 8 expands the opening of the shell 61 along with the screwing of the screw 7, so that the shell 61 fully abuts against the notch 105 of the pressure cap 2 and the universal nut 1, and the assembly stability is further improved.
11-17 And 19, the connecting piece comprises a pressing ring 9 and a limiting rod 10, wherein the pressing ring 9 is rotatably arranged on the screw 7, and a pressing groove 901 is formed in one end, far away from the screw 7, of the pressing ring 9;
According to the structure, when the screw 7 is assembled, the limiting rod 10 stretches into the opening of the shell 61, the pressing groove 901 of the pressing ring 9 can press the shell 61 along with the continuous screwing of the screw 7, the inner core 62 is compressed at the moment, the shell 61 is slightly deformed, the edge of the opening of the shell 61 can clamp the limiting rod 10, so that the axial positioning of the screw 7 and the limiting rod 10 is realized, the slipping risk of the screw 7 can be reduced, and the axial limiting of the orthopedic rod 6 can be improved;
In order to avoid the problem of rotation interference, the compression ring 9 is connected with the screw 7 in a rotation mode, so that after the compression groove 901 of the compression ring 9 is clamped with the orthopedic rod 6, the compression ring 9 does not rotate any more, but moves along the axial direction to compress the orthopedic rod 6;
Specifically, the stop lever 10 is provided with a T-shaped lever, and the protruding ends at two sides of the stop lever 10 extend into the housing 61, so that the housing 61 has better clamping stability to the stop lever 10.
In some embodiments, the compression ring 9 is fixed with the screw 7 by dispensing, when the orthopedic rod 6 abuts against the compression cap 2, the end part of the universal screw cap 1, which is far away from the bone anchor 3, is arranged, the distance between the end part and the top of the shell 61 is X2, the compressible distance of the inner core 62 is X3, the axial length of the screw 7 is X4, and then the length of the limiting rod 10 in the axial direction of the screw 7 is more than X2, and X3 is more than X4;
in such a structure, before the screw 7 is matched with the internal thread 101 of the universal nut 1, the limit rod 10 can be inserted into the opening of the shell 61, so that the limit rod 10 and the pressure ring 9 are circumferentially positioned, the screw 7 can be rotated at the moment to loosen the glue dispensing position because the pressure ring 9 is fixed with the screw 7 in a dispensing way, and the screw 7 can be continuously rotated under the condition that the pressure ring 9 and the limit rod 10 are circumferentially limited so as to be in threaded fit with the internal thread 101 until the pressure ring 9 and the limit rod 10 are locked and fixed;
at the same time, as the screw 7, the pressure ring 9 and the stop lever 10 are displaced, they compress the inner core 62 so that the screw 7 is completely immersed in the slot 105.
In some embodiments, the stop lever 10 is shorter, so that when assembled, the orthopedic rod 6 can be lifted first, and after the stop lever 10 is plugged into the housing 61, the rotating screw 7 is matched with the internal thread of the universal nut 1, so that the orthopedic rod 6 is pressed down. As shown in fig. 20, the opening edge of the housing 61 is provided with the anti-slip patterns 601, so that after the threaded post 8 or the stop lever 10 passes through the opening of the housing 61, the threaded post 8 or the stop lever 10 can have better friction with the housing 61, and the axial stop effect is improved, so that the stability of the structural assembly is further improved.
As shown in fig. 16 and 17, the universal nut 1 is provided with a caulking groove 106, the limiting block 11 is arranged on the outer wall of the orthopedic rod 6, and the limiting block 11 is jogged with the caulking groove 106;
When the nail rod system is applied, a plurality of bone anchors 3 and universal nail caps 1 are arranged, the orthopedic rod 6 can pass through the notches 105 of the universal nail caps 1, and the orthopedic rod 6 can be initially limited by matching the limiting blocks 11 on the outer wall of the orthopedic rod 6 with the caulking grooves 106 of the universal nail caps 1, so that the correct installation position of the orthopedic rod 6 is ensured;
Specifically, the stopper 11 is provided at one place on the outer wall of the orthopedic rod 6, or at two places symmetrically provided on the orthopedic rod 6, for initial positioning.
The specific implementation steps are as follows:
When the universal screw cap 1 is used, holes are drilled in bones of a patient, a plurality of bone anchors 3 are assembled, the posture of the universal screw cap 1 is corrected, the orthopedic rod 6 is placed into the universal screw cap 1, the orthopedic rod 6 abuts against the pressing cap 2, the pressing cap 2 abuts against the ball head 31 of the bone anchor 3, then the bones of the patient are subjected to stretching correction, after the correction is in place, the screw 7 is installed in the universal screw cap 1, and the orthopedic rod 6 and the pressing cap 2 are tightly pressed along with the screw 7 and the matching screwing of the internal threads 101, so that the relative positioning of the orthopedic rod 6, the bone anchors 3, the pressing cap 2 and the universal screw cap 1 is realized;
During the screwing of the screw 7, the threaded post 8 or stop bar 10, which serves as a connection, will cooperate with the orthopedic rod 6 to adequately position the orthopedic rod 6.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. A nail rod system is characterized by comprising a multi-shaft nail, a screw (7) and a connecting piece, wherein the multi-shaft nail comprises a universal nail cap (1), a press cap (2), a bone anchor (3) and a thrust ring (4),
The universal nut (1) is of a cylindrical structure, an internal thread (101), a first inner hole (102) and a second inner hole (103) are sequentially arranged in the universal nut (1) from one end to the other end, a notch (105) is formed in the universal nut (1) along the radial direction, and the notch (105) is used for installing an orthopedic rod (6);
-said first internal hole (102) is truncated through said notch (105) in the axial direction of said orthopedic rod (6), the internal diameter of said first internal hole (102) being smaller than the internal diameter of said second internal hole (103) in a direction perpendicular to the axial direction of said orthopedic rod (6);
the second inner bore (103) has an inner diameter in the axial direction of the orthopedic rod (6) that is larger than an inner diameter in a direction perpendicularly intersecting the axial direction of the orthopedic rod (6);
the press cap (2) is arranged in the first inner hole (102) and the second inner hole (103) in a sliding mode, and the press cap (2) extends into the notch (105) partially;
one end of the bone anchor (3) is provided with a ball head (31), and the ball head (31) is arranged in the universal nut (1);
The pressing cap (2) and the thrust ring (4) are oppositely arranged at two sides of the ball head (31) so as to limit the bone anchor (3);
The screw (7) is connected with the internal thread (101) of the universal screw cap (1) and presses the orthopedic rod (6), the connecting piece is arranged on the screw (7) and is connected with the orthopedic rod (6) so as to realize the circumferential, radial and axial limit of the orthopedic rod (6) relative to the universal screw cap (1);
The orthopedic rod (6) comprises a shell (61) and an inner core (62), wherein the shell (61) is an arc-shaped shell, the shell (61) penetrates through the notch (105), an opening of the shell (61) faces the screw (7), the connecting piece penetrates through the opening of the shell (61), the inner core (62) is arranged in the shell (61), and the inner core (62) is made of elastic materials.
2. The nail rod system according to claim 1, further comprising a washer (5), wherein the universal nut (1) is provided with a third inner hole (104), wherein,
The third inner hole (104) is formed on one side, far away from the first inner hole (102), of the second inner hole (103), and the inner diameter of the third inner hole (104) is larger than the inner diameter of the second inner hole (103) in the direction perpendicularly intersecting with the axial direction of the orthopedic rod (6);
-said second internal hole (103) is identical to the internal diameter of said third internal hole (104) in the axial direction of said orthopedic rod (6);
the gasket (5) is arranged in the third inner hole (104), the gasket (5) abuts against the press cap (2) and the thrust ring (4), and the gasket (5) is made of elastic materials.
3. The nail rod system according to claim 2, characterized in that the washer (5) is of annular structure, and the inside of the washer (5) is provided with a reinforcing rib (51);
the reinforcing ribs (51) are of annular structures, and a plurality of reinforcing ribs (51) are arranged along the axial direction of the gasket (5);
One end of the ball head (31) facing the press cap (2) is provided with a plurality of step platforms (32).
4. A nail rod system according to claim 3, wherein said press cap (2) comprises a first plug section (21) and a second plug section (22), wherein,
The first inserting section (21) is provided with a limiting groove (201), the first inserting section (21) comprises an arc-shaped part (211) inserted in the first inner hole (102) and plane parts (212) positioned at two sides of the arc-shaped part (211), and the plane parts (212) are propped against the inner wall of the notch (105);
The second inserting section (22) and the first inserting section (21) are of an integrated structure, the second inserting section (22) is inserted into the second inner hole (103) and the third inner hole (104), and the second inserting section (22) abuts against the ball head (31).
5. The rod system of claim 1, wherein the connector is a threaded post (8), the threaded post (8) is of a tapered configuration, the threaded post (8) is disposed on the screw (7), and the threaded post (8) passes through the opening of the housing (61) and is threadedly engaged with the inner core (62).
6. The rod system according to claim 1, wherein the connector comprises a compression ring (9) and a stop lever (10), wherein,
The pressing ring (9) is rotatably arranged on the screw (7), and a pressing groove (901) is formed in one end, far away from the screw (7), of the pressing ring (9);
The limiting rod (10) is connected with the compression ring (9), and the limiting rod (10) is positioned in the compression groove (901);
The limit rod (10) passes through the opening of the shell (61) and abuts against the inner core (62).
7. The nail rod system according to claim 1, further comprising a limiting block (11), wherein a caulking groove (106) is formed in the universal nail cap (1), the limiting block (11) is arranged on the outer wall of the orthopedic rod (6), and the limiting block (11) is embedded with the caulking groove (106).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410984850.3A CN118902582B (en) | 2024-07-22 | 2024-07-22 | Multi-shaft nail and nail rod system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410984850.3A CN118902582B (en) | 2024-07-22 | 2024-07-22 | Multi-shaft nail and nail rod system |
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| CN118902582A CN118902582A (en) | 2024-11-08 |
| CN118902582B true CN118902582B (en) | 2025-03-14 |
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| CN202410984850.3A Active CN118902582B (en) | 2024-07-22 | 2024-07-22 | Multi-shaft nail and nail rod system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202821566U (en) * | 2012-07-06 | 2013-03-27 | 常州市康辉医疗器械有限公司 | Novel universal vertebral pedicle screw |
| CN112370138A (en) * | 2020-11-24 | 2021-02-19 | 朱晓东 | Orthopedic screw and system for scoliosis of children |
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|---|---|---|---|---|
| CA2516791C (en) * | 2003-02-25 | 2011-12-13 | Stephen Ritland | Adjustable rod and connector device and method of use |
| CN101822572B (en) * | 2010-03-08 | 2012-08-01 | 北京纳通科技集团有限公司 | Screw holding rod, screw holding rod structure and spine internal fixing auxiliary system |
| EP2658461A1 (en) * | 2010-12-29 | 2013-11-06 | Roger P. Jackson | Polyaxial bone anchor with open planar retainer, pop-on shank and friction fit insert |
| US9549765B2 (en) * | 2014-04-03 | 2017-01-24 | Zimmer Spine, Inc. | Uniplanar bone screw |
| KR101701990B1 (en) * | 2016-04-08 | 2017-02-13 | 주식회사 지에스메디칼 | Cervical screw apparatus |
| US12053209B2 (en) * | 2022-01-18 | 2024-08-06 | Roger P. Jackson | Spinal fixation systems with modular receiver and ring retainer sub-assemblies for connecting with universal shank heads |
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- 2024-07-22 CN CN202410984850.3A patent/CN118902582B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202821566U (en) * | 2012-07-06 | 2013-03-27 | 常州市康辉医疗器械有限公司 | Novel universal vertebral pedicle screw |
| CN112370138A (en) * | 2020-11-24 | 2021-02-19 | 朱晓东 | Orthopedic screw and system for scoliosis of children |
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| CN118902582A (en) | 2024-11-08 |
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