CN111870332B - Vertebral body bone expander - Google Patents
Vertebral body bone expander Download PDFInfo
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- CN111870332B CN111870332B CN202010524786.2A CN202010524786A CN111870332B CN 111870332 B CN111870332 B CN 111870332B CN 202010524786 A CN202010524786 A CN 202010524786A CN 111870332 B CN111870332 B CN 111870332B
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- plate
- shaped front
- front plate
- supporting plate
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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
- A61B17/8852—Tools for expanding or compacting bones or discs or cavities therein capable of being assembled or enlarged, or changing shape, inside the bone or disc
- A61B17/8855—Tools for expanding or compacting bones or discs or cavities therein capable of being assembled or enlarged, or changing shape, inside the bone or disc inflatable, e.g. kyphoplasty balloons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7071—Implants for expanding or repairing the vertebral arch or wedged between laminae or pedicles; Tools therefor
Abstract
The invention relates to a vertebral body bone expander which comprises a supporting component, an adjusting component and a supporting spring.
Description
Technical Field
The invention relates to a medical instrument, in particular to a vertebral body bone expander used in vertebral body compression fracture surgery treatment.
Background
Compression fracture of vertebral bodies due to trauma or pathological causes usually requires the treatment of correcting kyphotic deformity. During surgery, a vertebral body bone expander is needed to be adopted to expand and reset the vertebral body at the pathological change position, and then bone cement is implanted into the reset vertebral body. The currently used vertebral body bone expander is a balloon bone expander, and the working principle of the vertebral body bone expander is that a pathological vertebral body is expanded by pressurizing the balloon. However, this technique has the following disadvantages: 1. due to the characteristics of the compressed air in the saccule, the compressed air in the saccule can expand to a part with small resistance during pressurization and expansion, so that the part with large resistance is not enough in distraction height, and the orthopedic effect is not ideal; 2. after the vertebral body is expanded, the balloon needs to be taken out firstly to implant bone cement, so that the operation process is complicated, and the vertebral body bone is easily damaged in the taking-out process. 3. The permanent implantation of bone cement in the body of the technique can cause the stress of the superior vertebral body and intervertebral disc to be increased, thereby causing the fracture of the adjacent vertebral body and the protrusion of the intervertebral disc in a long term. 4. If the bone cement is not dispersed enough, the fractured vertebral body can be caused to be fractured again, and the fractured vertebral body is repaired extremely difficultly because the bone cement exists in the vertebral body.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a vertebral body bone expander aiming at the defects of the prior art so as to increase the expansion effect, improve the operation efficiency and reduce postoperative complications.
The technical scheme is as follows: the invention provides a vertebral body bone expander, which comprises:
the supporting assembly comprises an upper supporting plate and a lower supporting plate which are arranged oppositely, a front supporting plate is arranged at the front end between the upper supporting plate and the lower supporting plate, and a rear end plate is arranged at the rear end between the upper supporting plate and the lower supporting plate; the upper supporting plate and the lower supporting plate are both grid plates; the front supporting plate comprises an inverted L-shaped front plate at the upper part and an L-shaped front plate at the lower part, the rear end plate, the vertical part of the inverted L-shaped front plate and the vertical part of the L-shaped front plate are telescopic, a square adjusting cavity is formed between the inverted L-shaped front plate and the L-shaped front plate, and two inner ends of the square adjusting cavity are respectively positioned on the inverted L-shaped front plate and the L-shaped front plate and are provided with adjusting parts; a rack is arranged on the adjusting part along the longitudinal direction, and a plurality of grooves are arranged on the adjusting part and positioned on the side of the rack;
the adjusting assembly comprises a gear and a hollow adjusting rod arranged at the end part of the gear, and the hollow adjusting rod is communicated with the gear to form an implantation channel; the end part of the gear is also provided with a non-return part, the non-return part is provided with a plurality of elastic bulges, the gear is meshed with the rack, and the elastic bulges are arranged in the grooves;
w type supporting spring is equipped with a plurality ofly, arranges in go up between backup pad and the bottom suspension fagging, respectively with go up backup pad and bottom suspension fagging and be connected fixedly.
Preferably, the dilator is made of tantalum metal.
Preferably, the vertical part of the inverted-L-shaped front plate is fixedly connected with the horizontal part of the L-shaped front plate, and the horizontal part of the inverted-L-shaped front plate is fixedly connected with the vertical part of the L-shaped front plate.
Preferably, the grid plate adopts a two-way orthogonal net rack, a two-way oblique net rack or a two-way orthogonal oblique net rack.
Preferably, the groove is arranged on the outer side of the rack; the outside end of gear sets gradually non return portion, hollow regulation pole.
Preferably, the elastic protrusion is an elastic positioning pin.
Preferably, the end of the elastic protrusion is provided in a blunt cone type.
Preferably, the number of the elastic protrusions is two, and the two elastic protrusions are respectively arranged at two side ends of the non-return part.
Preferably, the plurality of grooves are uniformly distributed on the adjusting part.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a vertebral body bone expander which comprises a supporting assembly, an adjusting assembly and a supporting spring, and can effectively increase the expansion effect, improve the operation efficiency and reduce postoperative complications.
Drawings
Fig. 1 is a structural view of a state in which the upper support plate and the lower support plate are closed according to the embodiment of the present invention.
Fig. 2 is a structural view of the state of the upper support plate and the lower support plate when the upper support plate and the lower support plate are spread in the embodiment of the present invention.
Fig. 3 is a structural view of an upper support plate or a lower support plate in the embodiment of the present invention.
Fig. 4 is a structural view of a front support plate in the embodiment of the present invention.
Fig. 5 is a structural view of an adjusting portion in the embodiment of the present invention.
Fig. 6 is a block diagram of an adjustment assembly in an embodiment of the invention.
In the attached drawing, 1-an upper supporting plate, 2-a lower supporting plate, 3-a front supporting plate, 4-an elastic locating pin, 5-a W-shaped supporting spring, 6-an inverted L-shaped front plate, 7-an L-shaped front plate, 8-a square adjusting cavity, 9-an adjusting part, 10-a rack, 11-a groove, 12-a gear, 13-a hollow adjusting rod, 14-a non-return part and 15-a rear end plate.
Detailed Description
The technical solution of the present invention is described in detail below with reference to specific examples and drawings, but the scope of the present invention is not limited to the examples.
Examples
A vertebral body bone expander made of tantalum metal, as shown in fig. 1-6, said expander comprising: support assembly, adjusting part and supporting spring.
Referring to fig. 1, the support assembly includes an upper support plate 1 and a lower support plate 2 which are oppositely arranged, a front support plate 3 is arranged at the front end between the upper support plate 1 and the lower support plate 2, and a telescopic rear end plate 15 is arranged at the rear end between the upper support plate 1 and the lower support plate 2; referring to fig. 3, the upper supporting plate 1 and the lower supporting plate 2 are both grid plates, and the grid plates adopt two-way orthogonal grid frames; referring to fig. 4, the front support plate 3 includes an inverted L-shaped front plate 6 at the upper part and an L-shaped front plate 7 at the lower part, and both the vertical part of the inverted L-shaped front plate 6 and the vertical part of the L-shaped front plate 7 are retractable, that is, the length is adjustable, the vertical part of the inverted L-shaped front plate 6 is fixedly connected with the horizontal part of the L-shaped front plate 7, the horizontal part of the inverted L-shaped front plate 6 is fixedly connected with the vertical part of the L-shaped front plate 7, a square adjusting cavity 8 is formed between the inverted L-shaped front plate 6 and the L-shaped front plate 7, and two inner ends of the square adjusting cavity 8 are respectively arranged on the vertical part of the inverted L-shaped front plate 6 and the vertical part of the L-shaped front plate 7 and are provided with an adjusting part 9; referring to fig. 5, a rack 10 is longitudinally disposed on the adjusting portion 9, and a plurality of grooves 11 uniformly distributed are longitudinally disposed on the adjusting portion 9 at the outer side of the rack 10. The widths of the vertical parts of the inverted L-shaped front plate 6 and the L-shaped front plate 7 are both larger than the width of the horizontal part; telescopic rear end plate 15 and vertical portion include outer expansion plate and interior expansion plate, and on vertical portion's the outer expansion plate was located to regulating part 9, fall L type front bezel 6 through interior expansion plate and L type front bezel 7 fixed connection, L type front bezel 7 through interior expansion plate and the 6 fixed connection of falling L type front bezel.
Referring to fig. 6, the adjusting assembly comprises a gear 12, and a non-return part 14 and a hollow adjusting rod 13 which are sequentially arranged at the outer end of the gear 12, wherein the hollow adjusting rod 13, the non-return part 14 and the gear 12 are communicated to form an implantation channel; two elastic positioning pins 4 are arranged on the non-return part 14 and are respectively arranged at two side ends of the non-return part 14, the end parts of the elastic positioning pins 4 are arranged to be in a blunt cone shape, the grooves 11 are matched with the elastic positioning pins 4, the gears 12 are respectively meshed with the racks 10 at two inner sides of the square adjusting cavity 8, and the elastic positioning pins 4 are arranged in the grooves 11.
Referring to 1,W, a plurality of supporting springs 5 are provided, and are disposed between the upper supporting plate 1 and the lower supporting plate 2, and are respectively connected and fixed with the upper supporting plate 1 and the lower supporting plate 2.
The working principle and the specific effects of the embodiment are as follows: when the vertebral compression fracture operation treatment is carried out, the dilator in the state shown in fig. 1 is taken up, in this state, the upper supporting plate 1 and the lower supporting plate 2 are both grid plates, and a plurality of W-shaped supporting springs 5 are arranged between the upper supporting plate 1 and the lower supporting plate 2, so that the supporting component forms a cage structure, two elastic positioning pins 4 are arranged in the groove 11, the mutually meshed gear 12 and the rack 10 are locked, the supporting springs 5 are in a compression state, in this state, the distance between the upper supporting plate 1 and the lower supporting plate 2 is minimized, so that the dilator enters a pathological vertebral body in a state of minimum volume; then the dilator of the embodiment is inserted into a pathological vertebral body, the hollow adjusting rod 13 is rotated anticlockwise, the elastic positioning pins 4 leave the grooves 11, the gear 12 rotates and drives the upper supporting plate 1 to move upwards through the rack 10 and the front supporting plate 3 respectively, the lower supporting plate 2 is driven to move downwards, the supporting spring 5 is driven to expand towards two ends, when the gear 12 rotates to a certain degree, the two elastic positioning pins 4 are placed in the grooves 11, the gear 12 and the rack 10 are locked again, as shown in the state of fig. 2, bone cement is implanted into a net structure formed by the supporting spring 5 through an implantation channel formed by the hollow adjusting rod 13, the non-return part 14 and the gear 12, and the bone cement is easy to diffuse before being solidified due to the fact that the solidification time of the bone cement is about 1min, the requirement on the operation technology is high, at the moment, the net structure formed by the W-shaped supporting spring 5 can slow down the diffusion speed of the bone cement, and the operation technology is reduced; when the operation is finished, the supporting component can be continuously expanded or stopped to expand according to the operation requirement, when the centrum does not need to be continuously expanded again, the adjusting component is drawn out, the elastic positioning pin 4 is separated from the groove 11, the gear 12 is separated from the rack 10, at the moment, the supporting spring 5 plays a supporting role for the whole supporting component, and the supporting component elastically supports the centrum instead of rigidly supports the centrum due to the fact that the supporting spring 5 has certain elasticity, and the damage to the centrum bone is effectively reduced. In addition, only one medical instrument is needed in the whole operation process, and the possibility of vertebral body bone injury and spinal cord injury caused by repeated puncture is avoided.
In addition, the embodiment is made of porous tantalum metal, which is a good medical bone repair material and has a high friction coefficient, so that the porous tantalum metal has better mechanical stability, has excellent biocompatibility due to no surrounding inflammatory reaction after the tantalum implant is implanted into an animal body, has elasticity, and has better resetting effect than balloon expansion when being made into an expander, but the porous tantalum metal has the defects of fatigue fracture and prosthesis loosening due to high elastic modulus, and is made into a W-shaped spring structure as a main support of the support component, and the defects of the porous tantalum metal are just compensated due to the relatively low elastic modulus of the W-shaped spring. In addition, the tantalum metal can induce bone growth, so that the tantalum metal mesh formed by the W-shaped supporting spring 5 in the supporting piece is more favorable for bone growth, has good compatibility with a human body and corrosion resistance, can be permanently implanted into the human body as an implant without being taken out, reduces the damage to the vertebral body bone, reduces the operation steps of the operation and improves the operation efficiency; in addition, in consideration of the stability before the bone grows into the tantalum metal mesh, the absorbable bone cement is used for primary stabilization and pain relief, the bone growth is also primarily completed after the absorbable bone cement is gradually absorbed, the bone cement is gradually replaced by the bone growth in the middle and later periods, the supporting effect of the supporting component is further improved on the basis of the W-shaped supporting spring 5, the W-shaped spring made of porous tantalum metal is similar to the bone of a normal human body, and therefore the bone growth cannot cause the fracture or the protrusion of the intervertebral disc due to the increase of stress of an upper vertebral body or the intervertebral disc.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A vertebral body bone expander, said expander being made of tantalum metal, said expander comprising:
the supporting assembly comprises an upper supporting plate and a lower supporting plate which are arranged oppositely, a front supporting plate is arranged at the front end between the upper supporting plate and the lower supporting plate, and a rear end plate is arranged at the rear end between the upper supporting plate and the lower supporting plate; the upper supporting plate and the lower supporting plate are both grid plates; the front supporting plate comprises an inverted L-shaped front plate at the upper part and an L-shaped front plate at the lower part, the rear end plate, the vertical part of the inverted L-shaped front plate and the vertical part of the L-shaped front plate are all telescopic, a square adjusting cavity is formed between the inverted L-shaped front plate and the L-shaped front plate, and two inner ends of the square adjusting cavity are respectively positioned on the inverted L-shaped front plate and the L-shaped front plate and are provided with adjusting parts; a rack is arranged on the adjusting part along the longitudinal direction, and a plurality of grooves are arranged on the adjusting part and positioned on the side of the rack;
the adjusting assembly comprises a gear and a hollow adjusting rod arranged at the end part of the gear, and the hollow adjusting rod is communicated with the gear to form an implantation channel; the end part of the gear is also provided with a non-return part, the non-return part is provided with a plurality of elastic bulges, the gear is meshed with the rack, and the elastic bulges are arranged in the grooves;
w type supporting spring is equipped with a plurality ofly, arranges in go up between backup pad and the bottom suspension fagging, respectively with go up backup pad and bottom suspension fagging and be connected fixedly.
2. The vertebral bone expander of claim 1 wherein the vertical portion of the inverted L-shaped front plate is fixedly connected to the horizontal portion of the L-shaped front plate and the horizontal portion of the inverted L-shaped front plate is fixedly connected to the vertical portion of the L-shaped front plate.
3. The vertebral body bone expander according to claim 1 or 2, wherein the grid plate is a two-way orthogonal grid, a two-way oblique grid or a two-way orthogonal oblique grid.
4. The vertebral bone expander according to claim 1 or 2, wherein said groove is placed outside of the rack; the outside end of gear sets gradually non return portion, hollow adjusting rod.
5. The vertebral body bone expander of claim 1, wherein said resilient projections are resilient locating pins.
6. A vertebral body bone expander according to claim 1 or claim 5 and wherein the ends of said resilient projections are arranged in the form of a blunt cone.
7. The vertebral bone expander according to claim 1 or 2, wherein said elastic protrusions are provided in two numbers, respectively placed at both side ends of said non-return portion.
8. The vertebral bone expander according to claim 1 or 2, wherein said plurality of grooves are evenly distributed on said adjustment portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010524786.2A CN111870332B (en) | 2020-06-10 | 2020-06-10 | Vertebral body bone expander |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010524786.2A CN111870332B (en) | 2020-06-10 | 2020-06-10 | Vertebral body bone expander |
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| Publication Number | Publication Date |
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| CN111870332A CN111870332A (en) | 2020-11-03 |
| CN111870332B true CN111870332B (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010524786.2A Active CN111870332B (en) | 2020-06-10 | 2020-06-10 | Vertebral body bone expander |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909548B (en) * | 2008-01-17 | 2014-07-30 | 斯恩蒂斯有限公司 | An expandable intervertebral implant and associated method of manufacturing the same |
| EP2268219B1 (en) * | 2008-03-28 | 2016-11-09 | K2M, Inc. | Expandable cage |
| WO2014063255A1 (en) * | 2012-10-25 | 2014-05-01 | The Royal Institution For The Advancement Of Learning/Mcgill University | Expandable prosthetic vertebral implant |
| TWI571233B (en) * | 2013-02-08 | 2017-02-21 | Stage - supported vertebral body fixation | |
| US9211197B2 (en) * | 2013-03-14 | 2015-12-15 | Atlas Spine, Inc. | Expandable corpectomy device |
| US9901459B2 (en) * | 2014-12-16 | 2018-02-27 | Globus Medical, Inc. | Expandable fusion devices and methods of installation thereof |
| TW202011903A (en) * | 2018-09-18 | 2020-04-01 | 寶楠生技股份有限公司 | Expandable and adjustable implantation device capable of making the vertebral body deformed and restored to the original angle thereof |
| CN110314019A (en) * | 2019-06-19 | 2019-10-11 | 四川大学华西医院 | A kind of adjustable cervical fusion cage |
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