CN114129314A - Intervertebral implant capable of being expanded - Google Patents
Intervertebral implant capable of being expanded Download PDFInfo
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- CN114129314A CN114129314A CN202111307020.XA CN202111307020A CN114129314A CN 114129314 A CN114129314 A CN 114129314A CN 202111307020 A CN202111307020 A CN 202111307020A CN 114129314 A CN114129314 A CN 114129314A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
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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
- A61B17/8802—Equipment for handling bone cement or other fluid fillers
- A61B17/8805—Equipment for handling bone cement or other fluid fillers for introducing fluid filler into bone or extracting it
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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
- A61B17/885—Tools for expanding or compacting bones or discs or cavities therein
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- Orthopedic Medicine & Surgery (AREA)
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- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Vascular Medicine (AREA)
- Prostheses (AREA)
Abstract
The invention discloses a distractable intervertebral implant, which belongs to the technical field of orthopedic implants and comprises an intermediate structure, wherein a distraction body is arranged above and/or below the intermediate structure, a porous structure is arranged on the distraction body, the intermediate structure comprises a front end, a rear end and a distraction structure, the distraction structure comprises a driving rod, and the driving rod is in transmission connection with the distraction body so as to drive the distraction body to be expanded outwards or folded inwards in the rotation process; the driving rod is positioned at the front part of the middle structure, and a set distance is reserved between the tail operating end of the driving rod and the rear end of the middle structure so as to form a bone grafting cavity at the rear part of the middle structure; the rear end of the middle structure is provided with an insertion opening which is communicated with the bone grafting cavity and is used for inserting an operation instrument. The distractible intervertebral implant has the advantages of good bone grafting effect, high bone fusion rate, capability of recovering the height and tension of vertebral segments and guarantee of spinal stability.
Description
Technical Field
The invention relates to the technical field of orthopedic implants, in particular to an intervertebral implant capable of being expanded.
Background
The lumbar intervertebral fusion can effectively treat the characteristics of lumbar degeneration, instability and the like, can fuse the upper vertebral body and the lower vertebral body, maintain the intervertebral space height, relieve the pressure of nerve roots and maintain the stability of the vertebral column. The clinical effect is satisfactory, the operation wound is small, and the operation is convenient.
Along with the popularization of clinical application and the progress of theoretical research in recent years, the conventional implants are gradually found to have certain defects, for example, although the existing intervertebral-distracting implants on the market can effectively ensure the intervertebral space height and relieve the symptoms of compression caused by vertebral bodies, the problems of poor bone grafting effect, low bone fusion rate, unsatisfactory restoration of the physiological lordosis of the vertebral bodies after the vertebral body fusion are solved.
Disclosure of Invention
The invention aims to provide the distractable intervertebral implant with good bone implanting effect and high bone fusion rate.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a can strut intervertebral implant, includes the intermediate structure, the top and/or the below of intermediate structure are equipped with the distraction body, be equipped with porous structure on the distraction body, the intermediate structure includes front end, rear end and struts the structure, wherein:
the opening structure comprises a driving rod, and the driving rod is in transmission connection with the opening body so as to drive the opening body to open outwards or close inwards in the rotating process;
the driving rod is positioned at the front part of the middle structure, and a set distance is reserved between the tail operating end of the driving rod and the rear end of the middle structure so as to form a bone grafting cavity at the rear part of the middle structure;
the rear end of the middle structure is provided with an insertion opening which is communicated with the bone grafting cavity and is used for inserting an operating instrument.
Furthermore, the middle structure comprises a tail frame arranged at the rear part, the tail frame comprises a front connecting part, a rear connecting part and a pair of lateral connecting arms for connecting the front connecting part and the rear connecting part, the rear connecting part forms the rear end of the middle structure, an internal cavity surrounded by the tail frame forms the bone grafting cavity, and the tail part of the driving rod is arranged on the front connecting part.
Furthermore, the strutting structure also comprises a head strutting block, the head strutting block forms the front end of the intermediate structure, the head of the driving rod is in transmission connection with the head strutting block so as to drive the head strutting block to be close to or far away from the tail frame in the rotating process, and pushing inclined planes matched with each other are arranged on the surfaces of the head strutting block and the strutting body.
Furthermore, pushing inclined planes matched with each other are also arranged on the surfaces of the rear connecting part of the tail frame, which are opposite to the spreading body, and the head spreading block and the pushing inclined planes on the rear connecting part of the tail frame are splayed.
Furthermore, one of the surfaces of the head opening block and the opening body, and the surface of the rear connecting part of the tail frame opposite to the opening body is provided with a dovetail-shaped boss extending along the relative sliding direction, and the other surface is provided with a dovetail-shaped sliding groove matched with the dovetail-shaped boss; alternatively, the distractor includes a solid outer frame region and a porous structure region within the solid outer frame region.
Further, be equipped with the actuating lever mounting hole on the preceding connecting portion, the rear end axial fixity of actuating lever, the rotatable assembly of circumference are in the actuating lever mounting hole, the actuating lever is the threaded rod, the rear end of actuating lever is equipped with the annular groove, wherein:
the front connecting part is provided with a pin hole communicated with the driving rod mounting hole, a pin is arranged in the pin hole, and the tail end of the pin extends into the annular groove;
or, a snap ring groove is formed in the driving rod mounting hole, and a C-shaped snap ring is arranged in the annular groove and the snap ring groove.
Further, the intermediate structure comprises a main body frame, and the front end and the rear end of the main body frame form the front end and the rear end of the intermediate structure;
a partition plate is arranged in the middle of the main body frame, an internal cavity defined by the main body frame and the partition plate is arranged behind the partition plate to form the bone grafting cavity, and the distraction structure further comprises a front end moving block which is positioned in the main body frame and is positioned in front of the partition plate;
the head and the tail of the driving rod are respectively connected with one of the front end moving block and the partition plate in an axially fixed and circumferentially rotatable manner and are connected with the other in a threaded manner so as to drive the front end moving block to move back and forth in the rotation process of the driving rod; the front end moving block is in transmission connection with the opening body.
Further, be equipped with the actuating lever mounting hole on the baffle, the rear end axial fixity of actuating lever, the rotatable assembly of circumference are in the actuating lever mounting hole, the actuating lever is the threaded rod, the rear end of actuating lever is equipped with the annular groove, wherein:
the front connecting part is provided with a pin hole communicated with the driving rod mounting hole, a pin is arranged in the pin hole, and the tail end of the pin extends into the annular groove;
or, a snap ring groove is formed in the driving rod mounting hole, and a C-shaped snap ring is arranged in the annular groove and the snap ring groove.
Further, the intermediate structure comprises a main body frame, and the front end and the rear end of the main body frame form the front end and the rear end of the intermediate structure;
the distraction structure further comprises a front end moving block positioned in the main body frame, an internal cavity defined by the main body frame and the rear part of the front end moving block forms the bone grafting cavity, and the head part and the tail part of the driving rod are respectively connected with one of the front end of the main body frame and the front end moving block in an axially fixed and circumferentially rotatable manner and are connected with the other screw thread; the front end moving block is in transmission connection with the opening body.
Further, the front end moving block is connected with the distraction body through a connecting rod or matched with the distraction body through pushing an inclined plane; alternatively, the distractor includes a solid outer frame region and a porous structure region within the solid outer frame region.
The invention has the following beneficial effects:
compared with the prior art, the distractible intervertebral implant of the invention has the advantages that after the distractible intervertebral implant is implanted into a human body, the rear part of the intermediate structure is still provided with the bone grafting cavity, the bone filling materials such as bone mud, bone blocks, bone powder and the like can be implanted into the bone grafting cavity by utilizing the operation instrument to penetrate through the splicing opening, the increased bone grafting space after the implant is distracted is fully utilized, the bone is fully implanted in the implant, the bone grafting fusion effect is improved, and the later period bone fusion is convenient, thereby ensuring good fixation of the implant and increasing osseous fusion and meeting the clinical requirements. The distractible intervertebral implant has the advantages of good bone grafting effect, high bone fusion rate, capability of recovering the height and tension of vertebral segments and guarantee of spinal stability.
Drawings
FIG. 1 is a top view of an embodiment 1 of the distractible intervertebral implant of the present invention;
FIG. 2 is a side view of embodiment 1 of the distractible intervertebral implant of the present invention;
FIG. 3 is a schematic view of a distractor block of embodiment 1 of the distractible intervertebral implant of the present invention shown in a side view and a side cross-sectional view;
FIG. 4 is a schematic structural view of the caudal distraction block of FIG. 3;
FIG. 5 is a schematic view of a head distractor of embodiment 1 of the distractible intervertebral implant of the present invention;
FIG. 6 is a schematic view of a drive rod of embodiment 1 of the distractible intervertebral implant of the present invention;
FIG. 7 is a schematic structural view of the pin of FIG. 3;
FIG. 8 is a schematic view of a distractor block of another embodiment of the distractor intervertebral implant of embodiment 1 of the present invention shown in side view and in side cross-sectional view;
FIG. 9 is a schematic structural view of the caudal distraction block of FIG. 8;
FIG. 10 is a schematic view of the C-shaped snap ring of FIG. 8;
FIG. 11 is a schematic view of a distractor of embodiment 1 of the distractible intervertebral implant of the present invention, wherein (a) is a perspective view in one direction and (b) is a perspective view in another direction;
FIG. 12 is a schematic view of the overall structure of embodiment 2 of the distractible intervertebral implant of the present invention;
FIG. 13 is an exploded view of embodiment 2 of the distractible intervertebral implant of the present invention;
FIG. 14 is a schematic view of the combination of the main frame, the driving rod and the front moving block of embodiment 2 of the distracting intervertebral implant of the present invention;
FIG. 15 is a cross-sectional view of embodiment 2 of the distractible intervertebral implant of the invention;
FIG. 16 is a generally schematic structural view of embodiment 3 of the distractible intervertebral implant of the invention;
FIG. 17 is a schematic view of the distractible intervertebral implant of embodiment 3 after distraction;
FIG. 18 is a cross-sectional view of embodiment 3 of the distractible intervertebral implant of the present invention after distraction;
fig. 19 is a schematic view of the combination structure of the main frame, the driving rod and the front moving block in embodiment 3 of the distractible intervertebral implant of the present invention;
FIG. 20 is an exploded view of embodiment 3 of the distractible intervertebral implant of the present invention;
fig. 21 is a schematic view of the use state of the inventive distractible intervertebral implant, wherein (a) is a side view and (b) is a front view.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a distractable intervertebral implant, as shown in figures 1-21, which comprises an intermediate structure (mainly playing a role in supporting and distracting), distractors are arranged above and/or below the intermediate structure, and porous structures are arranged on the distractors 2, 2 'and 2' to increase bone fusion; the intermediate structure includes front end, rear end and struts the structure, wherein:
the expanding structure comprises driving rods 3, 3 'and 3', the driving rods 3, 3 'and 3' are in transmission connection with the expanding bodies 2, 2 'and 2' so as to drive the expanding bodies 2, 2 'and 2' to be expanded outwards or folded inwards in the rotating process;
the driving rod 3, 3 ' is positioned at the front part of the middle structure, and a set distance D is arranged between the tail operating end of the driving rod 3, 3 ' and the rear end of the middle structure so as to form a bone grafting cavity 10, 10 ' at the rear part of the middle structure;
the rear end of the middle structure is provided with an insertion opening 5-4 which is communicated with the bone grafting cavities 10, 10' and is used for inserting an operation instrument.
When the distracting intervertebral implant is used in an operation, the distracting intervertebral implant is firstly in a closed state shown in fig. 2, after the distracting intervertebral implant is implanted into a human body (namely, after the distracting intervertebral implant is placed into an intervertebral space, as shown in fig. 19), the position of the implant in an intervertebral disc is observed through an imaging device, an operation instrument passes through the insertion opening 5-4 to drive the driving rods 3, 3 ' to rotate, and the driving rods 3, 3 ' drive the distracting bodies 2, 2 ' to be opened outwards or closed inwards (namely, a state shown in fig. 3); during the period, a doctor can observe the distractable intervertebral implant through the developing equipment, freely adjust the distraction height of the distraction bodies 2, 2 'and 2' by controlling the driving rods 3, 3 'and 3', and take out the instrument after confirming the position; finally, bone filling materials such as bone paste, bone blocks, bone meal and the like are placed into the bone grafting cavities 10, 10 'and 10' through the inserting openings 5-4.
Compared with the prior art, the distractible intervertebral implant of the invention has the advantages that after the distractible intervertebral implant is implanted into a human body, the rear part of the intermediate structure is still provided with the bone grafting cavity, the bone filling materials such as bone mud, bone blocks, bone powder and the like can be implanted into the bone grafting cavity by utilizing the operation instrument to penetrate through the splicing opening, the increased bone grafting space after the implant is distracted is fully utilized, the bone is fully implanted in the implant, the bone grafting fusion effect is improved, and the later period bone fusion is convenient, thereby ensuring good fixation of the implant and increasing osseous fusion and meeting the clinical requirements. The distractible intervertebral implant has the advantages of good bone grafting effect, high bone fusion rate, capability of recovering the height and tension of vertebral segments and guarantee of spinal stability. The invention is mainly suitable for the posterior spinal column, in particular to a lumbar fusion fixation operation, and particularly relates to a distractable intervertebral implant with a front side which is parallelly distracted and a tail part which is provided with a large bone grafting cavity.
According to the structural form of the intermediate structure, the invention can have the following embodiments:
EXAMPLE 1 (head distraction + Tail frame)
As shown in fig. 1 to 11, to form the bone grafting cavity, the intermediate structure may include a rear frame 5 disposed at the rear portion, the rear frame 5 includes a front connection portion 5-6, a rear connection portion 5-7, and a pair of lateral connection arms 5-8 connecting the front connection portion 5-6 and the rear connection portion 5-7, the rear connection portion 5-7 constitutes the rear end of the intermediate structure, an inner cavity surrounded by the rear frame 5 forms a bone grafting cavity 10, the rear portion of the driving rod 3 is disposed on the front connection portion 5-6, that is, the rear operation end of the driving rod 3 is located at the front connection portion 5-6, and the insertion opening 5-4 is disposed on the rear connection portion 5-7.
In order to make the driving rod 3 drive the opening body 2 to open outwards or close inwards during the rotation process, various structural forms can be adopted, which can be easily thought by those skilled in the art, and the following structural forms are preferably adopted in the invention:
the distraction structure further comprises a head distraction block 1, the head distraction block 1 forms the front end of the intermediate structure, the head of the driving rod 3 is in transmission connection with the head distraction block 1 so as to drive the head distraction block 1 to be close to or far away from the tail frame 5 in the rotation process, and the surfaces of the head distraction block 1 and the distraction body 2 which are opposite are provided with thrusting inclined planes which are matched with each other. At this time, the driving rod 3 is driven to rotate, and the driving rod 3 drives the head distraction block 1 to approach or leave the tail frame 5, so as to drive the distraction body 2 to be outwards spread or inwards folded.
In the embodiment, only the front side can be propped open, the rear side can not be propped open, and the front side and the rear side can also be propped open simultaneously; when the front side and the rear side need to be simultaneously opened, the surfaces of the rear connecting part 5-7 of the tail frame 5 opposite to the opening body 2 can also be provided with pushing inclined planes which are matched with each other, and the pushing inclined planes on the head opening block 1 and the rear connecting part 5-7 of the tail frame 5 are splayed.
In order to conveniently increase the distraction distance, the distraction body in the invention preferably adopts the following structural form:
as shown in fig. 1-2, the distractor 2 includes an upper distractor located above the tail frame 5-7 and a lower distractor located below the tail frame 5. Specifically, the pushing inclined plane between the upper distraction body and the head distraction block 1 can gradually become lower from front to back, the pushing inclined plane between the upper distraction body and the back connection part 5-7 of the tail frame 5-7 can gradually become higher from front to back, and the two pushing inclined planes are in a shape of inverted V, so that the upper distraction body can be conveniently distracted to the outside (namely the upper side of the implant); the pushing inclined plane between the lower distraction body and the head distraction block 1 can gradually increase from front to back, the pushing inclined plane between the lower distraction body and the back connecting part 5-7 of the tail frame 5 can gradually decrease from front to back, and the two pushing inclined planes are in a shape of a Chinese character 'ba', so that the lower distraction body can be conveniently distracted to the outside (namely the lower side of the implant).
It is contemplated that only the upper distractor or only the lower distractor may be provided if the distractible intervertebral implant requires only one-sided distraction.
As shown in fig. 4-5 and 11, in order to stably brace the upper and lower distraction bodies, one of the surfaces of the head distraction block 1 and the distraction body, and the rear connection portion of the tail frame 5 opposite to the distraction body 2 may be provided with a dovetail-shaped boss extending in the relative sliding direction, and the other surface may be provided with a dovetail-shaped chute matching with the dovetail-shaped boss, and the dovetail-shaped boss and the dovetail-shaped chute may be matched to prevent the upper distraction body and the lower distraction body from being separated in the distraction process. In the embodiment shown in the figure, dovetail bosses 1-1 and 5-3 are arranged on a head opening block 1 and a tail opening block 5, and dovetail chutes 2-1 and 2-2 matched with the dovetail bosses 1-1 and 5-3 are arranged on an upper opening body and a lower opening body.
Certainly, in order to avoid the upper distraction body and the lower distraction body to break away from in the distraction process, a dovetail groove structure also can be omitted, connecting pieces which extend along the vertical direction and are overlapped with each other are arranged on the two sides of the upper distraction body and the lower distraction body, a long strip-shaped guide groove which extends along the vertical direction is arranged on one of the connecting pieces, the other connecting piece is clamped into a positioning column of the guide groove, and the upper distraction body and the lower distraction body are prevented from breaking away from in the distraction process through the limit between the guide groove and the positioning column.
Various configurations are possible for driving the cephalad expansion block 1 toward and away from the caudal frame 5, as will be readily appreciated by those skilled in the art, and the present invention preferably takes the following configuration:
the front connecting part 5-6 is provided with a driving rod mounting hole 5-1, the rear end of the driving rod 3 is axially fixed and circumferentially rotatable (namely can rotate in situ) assembled in the driving rod mounting hole 5-1, the driving rod 3 is a threaded rod, and the head opening block 1 is provided with a threaded hole 1-2 matched with the threaded rod. The rear end of the driving rod 3 can be provided with a driving part such as a quincuncial hole 3-3, and a doctor can use a quincuncial wrench to pass through an operation hole (namely, a plug-in opening 5-4) to operate the quincuncial hole 3-3 to rotate the driving rod 3 in the operation. Like this can accurately adjust the relative afterbody of head distraction piece 1 through the threaded rod and strut the removal of piece 5, and then the accurate regulation struts the distraction distance of body 2, and the threaded rod can not occupy bone grafting passageway 10 after removing.
In order to conveniently realize that the rear end of the driving rod 3 is axially fixed and circumferentially and rotatably assembled in the driving rod mounting hole 5-1, the invention can have the following structural form:
the structure form I:
as shown in fig. 3-4 and 6-7, the rear end of the driving rod 3 may be provided with an annular groove 3-2, the front connecting portion 5-6 is provided with a pin hole 5-2 communicated with the driving rod mounting hole 5-1, a pin 4 is provided in the pin hole 5-2, and the tail end 4-2 of the pin 4 extends into the annular groove 3-2. When the assembly device is used, the pin 4 is inserted into the annular groove 3-2 at the rear end of the driving rod 3 along the pin hole 5-2, so that the rear end of the driving rod 3 can be assembled in the driving rod mounting hole 5-1 in a rotating mode. The pin 4 can be clamped in the pin hole 5-2, however, in order to improve the fixing firmness, the pin hole 5-2 is preferably a threaded hole, the pin 4 is a screw (i.e. the structure shown in fig. 7) which is in threaded connection with the threaded hole, the front end of the screw is provided with a back-proof shaft 4-2 which is inserted into the annular groove 3-2, and the back end of the screw can be provided with a linear driving groove 4-1.
The structural form II is as follows:
as shown in fig. 6 and 8-10, the rear end of the driving rod 3 may be provided with an annular groove 3-2, a snap ring groove 5-1-1 is provided in the driving rod mounting hole 5-1, and a C-shaped snap ring 6 is provided in the annular groove 3-2 and the snap ring groove 5-1-1. When the drive rod assembly device is used, the C-shaped clamping ring 6 is arranged in the clamping ring groove 5-1-1, and then the drive rod 3 penetrates through the C-shaped clamping ring 6, so that the rear end of the drive rod 3 can be assembled in the drive rod mounting hole 5-1 in an in-situ rotating mode. In the embodiment shown in the figures, the C-shaped snap ring 6 is provided with an opening 6-1.
Example 2 (Main frame, inner partition)
As shown in fig. 12-15, to form the bone-grafting cavity, the intermediate structure may include a body frame 5' having front and rear ends constituting front and rear ends of the intermediate structure, respectively; the inner middle part of the main body frame 5 ' is provided with a partition plate 51 ', and an inner cavity enclosed by the inner part of the main body frame 5 ' behind the partition plate 51 ' forms a bone grafting cavity 10 '.
In order to make the driving rod 3 'drive the opening body 2' to open outwards or close inwards during the rotation process, various structural forms can be adopted, which can be easily thought by those skilled in the art, and the following structural forms are preferably adopted in the invention:
the expanding structure also comprises a front end moving block 1 ' which is positioned in the main body frame 5 ' and is positioned in front of the partition plate 51 '; the head and the tail of the driving rod 3 ' are respectively connected with one of the front end moving block 1 ' and the partition plate 51 ' in an axially fixed and circumferentially rotatable manner and are connected with the other in a threaded manner so as to drive the front end moving block 1 ' to move back and forth in the rotating process of the driving rod 3 '; the front end moving block 1 'is in transmission connection with the spreading body 2'.
In the embodiment shown in the figure, a driving rod mounting hole is formed in the partition plate 51 ', the tail part of the driving rod 3 ' is axially fixed and circumferentially rotatably assembled in the driving rod mounting hole, the driving rod 3 ' is a threaded rod, and the head part of the driving rod 3 ' is in threaded connection with the front end moving block 1 '. At the moment, the driving rod 3 ' is driven to rotate in the driving rod mounting hole, so that the front end moving block 1 ' can be driven to move back and forth, and the spreading body 2 ' is driven to spread outwards or fold inwards.
In order to facilitate the axial fixation and circumferential rotatable assembly of the rear end of the driving rod 3 'in the driving rod mounting hole of the partition plate 51', reference may be made to the first structural form and the second structural form, which are not described herein again.
The transmission connection between the front moving block 1 'and the spreading body 2' can adopt various structural forms which are easily thought by those skilled in the art, and the invention is preferably matched by a connecting rod connection or by pushing an inclined plane. In the embodiment shown in the figures, the front end moving block 1 'is connected with the spreading body 2' through a connecting rod 11 ', namely one end of the connecting rod 11' is hinged on the front end moving block 1 ', and the other end is hinged on the spreading body 2'; the front moving block 1' may be embodied as a lateral collar. In order to increase the spreading distance, the spreading body 2 ' includes an upper spreading body located above the main body frame 5 ' and a lower spreading body located below the main body frame 5 '. The engagement manner of the pushing inclined plane is the same as that described above, and will not be described herein again.
Example 3 (Main frame, no partition inside)
16-20, to form the bone graft cavity, the intermediate structure may include a body frame 5 "with the front and rear ends of the body frame 5" forming the front and rear ends of the intermediate structure; the expanding structure further comprises a front end moving block 1 positioned in the main body frame 5 ', and an internal cavity defined by the main body frame 5' and the rear part of the front end moving block 1 'forms a bone grafting cavity 10'.
In order to make the driving rod 3 "drive the opening body 2" to open outwards or close inwards during the rotation process, various structural forms can be adopted, which can be easily thought by those skilled in the art, and the following structural forms are preferably adopted in the invention:
the head and the tail of the driving rod 3 ' are respectively connected with one of the front end of the main body frame 5 ' and the front end moving block 1 ' in an axially fixed and circumferentially rotatable manner and are connected with the other in a threaded manner; the front end moving block 1 'is in transmission connection with the spreading body 2'.
In the embodiment shown in the figure, the tail part of the driving rod 3 'is axially fixed and circumferentially rotatably assembled on the front end moving block 1', and the head part of the driving rod 3 'is in threaded connection with the front end of the main body frame 5'. At this time, the driving rod 3 "is driven to rotate in the driving rod mounting hole on the front end moving block 1", so that the front end moving block 1 "can be driven to move back and forth, and the spreading body 2" is driven to spread outwards or fold inwards.
For conveniently realizing that the tail part of the driving rod 3 'is axially fixed and the driving rod mounting hole of the front end moving block 1' is assembled in a circumferential rotatable mode, the first structural form and the second structural form can be referred to, and the description is omitted here.
The transmission connection between the front end moving block 1 "and the spreading body 2" can adopt various structural forms which are easily thought by those skilled in the art, and the invention is preferably matched by a connecting rod connection or by pushing an inclined plane. In the embodiment shown in the figures, the front end moving block 1 "is connected with the spreading body 2" through a connecting rod 11 ', namely one end of the connecting rod 11' is hinged on the front end moving block 1 ", and the other end is hinged on the spreading body 2"; the front moving block 1 "may be embodied as a transverse collar. In order to increase the distraction distance conveniently, the distraction body 2 ' comprises an upper distraction body positioned above the main body frame 5 ' and a lower distraction body positioned below the main body frame 5 '. The engaging manner of the pushing inclined plane is the same as that described above, and will not be described herein again.
In each of the above embodiments, as shown in fig. 2, the outer surface of the distractor 2, 2', 2 ″ may be provided with a slope 2-6 gradually decreasing from the front end to the rear end of the intermediate structure, the slope 2-6 being inclined at an angle of 1-7 degrees; when the distractable intervertebral implant is not distracted, the front end point of the distracting body 2, 2 'or 2' is preferably positioned at 1/2-1/3 of the total length of the distractable intervertebral implant, so that the physiological angle of the intervertebral is better met, the physiological lordosis can be ideally recovered after the distracting body 2, 2 'or 2' is distracted, and the physiological curvature of the spine is recovered.
As shown in fig. 2, the front end of the intermediate structure is preferably bullet-shaped to facilitate implantation of the distractible intervertebral implant. As shown in fig. 4, to facilitate the holding of the implant by the holder, a pair of holding grooves 5-5 may be formed on both sides of the rear end of the intermediate structure. As shown in fig. 11 (b), in order to increase the bone fusion rate of the implant, the distractor 2, 2', 2 ″ may be provided with a bone grafting hole 2-5 communicating with the bone grafting passage 10. As shown in fig. 11 (a), in order to increase the firmness of the distractable intervertebral implant, the outer surface of the distracting bodies 2, 2', 2 ″ may be provided with protruding teeth, which may also be inclined towards the rear end of the intermediate structure, to facilitate implantation of the implant.
To ensure the overall strength of the distractor body 2, 2 ', 2 ", as shown in fig. 11 (a), the distractor body 2, 2', 2" preferably comprises a solid outer frame region 2-3 and a porous structural region 2-4 within the solid outer frame region 2-3.
The struts 2, 2 'and 2' are preferably manufactured by 3D printing or formed by acid washing and other processes, so that the surfaces of the struts form a porous structure, and the fusion with bones is facilitated. The material of the struts 2, 2', 2 "is preferably a titanium alloy or a tantalum or niobium zirconium alloy, or a metallic/non-metallic absorbable material, etc.
In conclusion, the height of the distractible intervertebral implant can be adjusted at will, the tail part of the distractible intervertebral implant is provided with a large bone grafting channel and a bone grafting space, when the implant is implanted into an intervertebral disc, a doctor can adjust the height of the implant through a box wrench according to the condition in the intervertebral disc, the implant can be adjusted to the optimal position to perform intervertebral orthopedic, the optimal effect is achieved, and the bone grafting instrument can implant bone filling materials such as bone mud, bone blocks, bone powder and the like into the implant through the bone grafting channel at the tail part, so that the fusion effect of the implant is enhanced. The distracting body is manufactured by 3D printing or formed by processes such as acid washing and the like, so that a porous structure is formed on the outer side surface of the distracting body, the distracting intervertebral implant can perfectly recover the height and the tension of a vertebral segment by utilizing the distracting force of the intervertebral implant, the compression is relieved, the physiological curvature of the spine is recovered, the osseous fusion of the intervertebral implant is increased, the stability of the spine is ensured, the back half part of the intervertebral implant has sufficient space, a large amount of bone filling materials can be implanted, and the bone fusion effect of the distracting intervertebral implant is improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a can strut intervertebral implant which characterized in that, includes the intermediate structure, the top and/or the below of intermediate structure are equipped with the distraction body, be equipped with porous structure on the distraction body, the intermediate structure includes front end, rear end and struts the structure, wherein:
the opening structure comprises a driving rod, and the driving rod is in transmission connection with the opening body so as to drive the opening body to open outwards or close inwards in the rotating process;
the driving rod is positioned at the front part of the middle structure, and a set distance is reserved between the tail operating end of the driving rod and the rear end of the middle structure so as to form a bone grafting cavity at the rear part of the middle structure;
the rear end of the middle structure is provided with an insertion opening which is communicated with the bone grafting cavity and is used for inserting an operating instrument.
2. A distractible intervertebral implant as recited in claim 1 wherein the intermediate structure includes a posterior frame disposed at a posterior portion, the posterior frame including a front connecting portion, a back connecting portion, and a pair of lateral connecting arms connecting the front and back connecting portions, the back connecting portion forming a posterior end of the intermediate structure, an interior cavity defined by the posterior frame forming the bone grafting cavity, and a posterior portion of the drive rod disposed on the front connecting portion.
3. The distractible intervertebral implant of claim 2, wherein the distracting structure further comprises a head distracting block, the head distracting block forms the front end of the intermediate structure, the head of the drive rod is in driving connection with the head distracting block to drive the head distracting block to approach or separate from the tail frame during rotation, and mutually cooperating pushing slopes are provided on surfaces of the head distracting block opposite to the distracting body.
4. The distractible intervertebral implant of claim 3, wherein the surfaces of the posterior connection portion of the caudal frame opposite the distractor are also provided with cooperating pushing ramps, and the pushing ramps on the posterior connection portions of the cephalad distraction block and the caudal frame are splayed.
5. The distractible intervertebral implant of claim 4, wherein one of the surfaces of the head distracting block and the distracting body, and the rear connecting portion of the tail frame opposite to the distracting body, is provided with a dovetail-shaped boss extending in the relative sliding direction, and the other surface is provided with a dovetail-shaped sliding groove cooperating with the dovetail-shaped boss;
alternatively, the distractor includes a solid outer frame region and a porous structure region within the solid outer frame region.
6. A distractible intervertebral implant according to any one of claims 2 to 5 wherein the front attachment portion has a drive rod receiving hole in which a rear end of the drive rod is axially fixed and circumferentially rotatably mounted, the drive rod being a threaded rod, the rear end of the drive rod having an annular recess, wherein:
the front connecting part is provided with a pin hole communicated with the driving rod mounting hole, a pin is arranged in the pin hole, and the tail end of the pin extends into the annular groove;
or, a snap ring groove is formed in the driving rod mounting hole, and a C-shaped snap ring is arranged in the annular groove and the snap ring groove.
7. The distractible intervertebral implant of claim 1, wherein said intermediate structure comprises a body frame, a front end and a rear end of said body frame constituting a front end and a rear end of said intermediate structure;
a partition plate is arranged in the middle of the main body frame, an internal cavity defined by the main body frame and the partition plate is arranged behind the partition plate to form the bone grafting cavity, and the distraction structure further comprises a front end moving block which is positioned in the main body frame and is positioned in front of the partition plate;
the head and the tail of the driving rod are respectively connected with one of the front end moving block and the partition plate in an axially fixed and circumferentially rotatable manner and are connected with the other in a threaded manner so as to drive the front end moving block to move back and forth in the rotation process of the driving rod; the front end moving block is in transmission connection with the opening body.
8. The distractible intervertebral implant of claim 7, wherein the spacer has a drive rod receiving hole, the rear end of the drive rod is axially fixed and circumferentially rotatable within the drive rod receiving hole, the drive rod is a threaded rod, and the rear end of the drive rod has an annular groove, wherein:
the front connecting part is provided with a pin hole communicated with the driving rod mounting hole, a pin is arranged in the pin hole, and the tail end of the pin extends into the annular groove;
or, a snap ring groove is formed in the driving rod mounting hole, and a C-shaped snap ring is arranged in the annular groove and the snap ring groove.
9. The distractible intervertebral implant of claim 1, wherein said intermediate structure comprises a body frame, a front end and a rear end of said body frame constituting a front end and a rear end of said intermediate structure;
the distraction structure further comprises a front end moving block positioned in the main body frame, an internal cavity defined by the main body frame and the rear part of the front end moving block forms the bone grafting cavity, and the head part and the tail part of the driving rod are respectively connected with one of the front end of the main body frame and the front end moving block in an axially fixed and circumferentially rotatable manner and are connected with the other screw thread; the front end moving block is in transmission connection with the opening body.
10. The distractible intervertebral implant of any one of claims 7-9, wherein the anterior moving mass is in pushing engagement with the distracting body via a linkage or via a pushing ramp;
alternatively, the distractor includes a solid outer frame region and a porous structure region within the solid outer frame region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111307020.XA CN114129314A (en) | 2021-11-05 | 2021-11-05 | Intervertebral implant capable of being expanded |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111307020.XA CN114129314A (en) | 2021-11-05 | 2021-11-05 | Intervertebral implant capable of being expanded |
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| CN202111307020.XA Pending CN114129314A (en) | 2021-11-05 | 2021-11-05 | Intervertebral implant capable of being expanded |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115844599A (en) * | 2022-08-08 | 2023-03-28 | 北京纳通医疗科技控股有限公司 | Distractable fusion device and design method thereof |
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- 2021-11-05 CN CN202111307020.XA patent/CN114129314A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115844599A (en) * | 2022-08-08 | 2023-03-28 | 北京纳通医疗科技控股有限公司 | Distractable fusion device and design method thereof |
| CN115844599B (en) * | 2022-08-08 | 2023-08-22 | 北京纳通医疗科技控股有限公司 | Distractable fusion cage and design method thereof |
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