CN203029370U - Injectable vertebral pedicle strengthening screw component - Google Patents
Injectable vertebral pedicle strengthening screw component Download PDFInfo
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- CN203029370U CN203029370U CN 201220628309 CN201220628309U CN203029370U CN 203029370 U CN203029370 U CN 203029370U CN 201220628309 CN201220628309 CN 201220628309 CN 201220628309 U CN201220628309 U CN 201220628309U CN 203029370 U CN203029370 U CN 203029370U
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- side opening
- screw
- injectable
- thread
- afterbody
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Abstract
The utility model discloses an injectable vertebral pedicle strengthening screw component which is composed of a bolt with side holes, an injection device and an inner bolt which are mutually matched to be used. The bolt with the side holes is made of medical titanium alloy materials and composed of a threaded section with the side holes, a threaded section without the side holes and a tail portion. The bolt with the side holes is provided with a central cavity which penetrates through the whole length. The threaded section with the side holes is provided with the side holes which are communicated with the central cavity along the direction of threads. The tail portion is a U-shaped groove. The injection device is made of medical polymer materials and composed of an injection end, an injection tube cavity and a piston, wherein the injection end is matched with the tail portion of the bolt with the side holes, the injection tube cavity is a cylindrical tube cavity, and a rod portion and a handle portion are connected to form the piston. The inner bolt is made of medical titanium alloy materials and composed of a cone and a cylinder, wherein the cone is arranged at the front end of the inner bolt, and the cylinder is arranged at the back end of the inner bolt. The injectable vertebral pedicle strengthening screw component can improve stability of internal fixation during initially injecting a nail on the condition of osteoporosis, reduce risks of looseness of the pedicle screw, enhance stability and reliability of the internal fixation of a spine and reduce incidence of surgical failure.
Description
Technical field
This utility model belongs to medical auxiliary apparatus, relate to the pedicle screw that uses in the internal fixation of spine, be particularly related to a kind of injectable vertebral pedicle strengthening screw assembly, be mainly used in improving the stability of internal fixation of spine under the osteoporosis condition, the risk of fixing failure in reducing.
Background technology
At present, technique for fixing has become routine techniques of spinal surgery in the pedicle.Pedicle screw can be rescued deformity of spine and carry out the spinal stabilization reconstruction by mode three-dimensionals such as traction, pressurization, rotations.Can the key of pedicle screw stability depends on obtain enough " sclerotin-screw " interface holds, and this hold will last till till the bone fusion that reaches firm between vertebral body.But in clinical position, osteoporosis often causes the LOCATION OF PEDICLE SCREW FIXATION ability to descend, and screw loosening is deviate from, thereby causes operative failure.Along with extensively carrying out of internal fixation of spine operation, it is also more and more that the postoperative that multiple reason causes is overhauled case.How effectively to improve the stability of internal fixation of spine under the osteoporosis condition, become puzzlement spinal surgery doctor's thorny problem.In addition, because patient's operating technology is unskilled, operation process is difficult to reach once put and follows closely successfully, inserts again after often screw need being back-outed in the art, and this also makes the hold of screw decline to a great extent.
For addressing the above problem, Chinese scholars has been carried out a large amount of correlational studyes, mainly concentrates on to improve screw designs and strengthen two aspects of processing, nail road.At the design aspect that improves screw, increasing screw diameter has the danger that causes fracture of vertebral pedicle, uses long spiro nail and then may destroy the vertebral body front pillar, can cause internal organs and blood vessel injury.Because the restriction of vertebral body and pedicle of vertebral arch anatomical structure, the effect that improves the screw constant intensity by the improvement screw designs is very restricted.
The method of sclerotin perfusion bone cement namely was screwed into forward direction at screw and follows closely direct injection bone cement in the road, and then is screwed into screw around main employing reached to the nail road clinically at present.But there is following point in this method:
1, the finite capacity in nail road, the dosage that injects bone cement is limited, and there is certain limitation in the effect of strengthening screw stability;
2, in traditional intensifying method, bone cement is evenly distributed in the sclerotin around the screw relatively, and tight parcel screw causes the considerable damage of sclerotin around getting in the nail process easily, puts nail for the taking-up of screw and secondary and brings difficulty and risk;
3, what is more important, in the process that screw is screwed into, in the sclerotin around bone cement is entered by the screw extruding, it flows and distributes uncontrolled, seepage, pressuring nerve etc. take place easily, especially small fracture takes place and when undiscovered, bone cement is pressed into canalis spinalis easily when being screwed into screw, compressing spinal cord and nerve when pedicle of vertebral arch place cortex.In case seepage in the generation canalis spinalis can not solve the problem that intraspinal pressure is compeled although in time take out screw.Even carefully detect dosage and the pressure of nail road, attention control injection material in the art, can not avoid the generation of seepage fully, brought great challenge therefore for patient's operation, limited clinical extensively quoting.
Summary of the invention
Defective or deficiency at above-mentioned prior art existence, the purpose of this utility model is, a kind of injectable vertebral pedicle strengthening screw assembly is proposed, the stability of fixing in this injectable vertebral pedicle strengthening screw can significantly improve under the osteoporosis condition, reduce the incidence rate that pedicle screw is loosening even deviate from, can increase the stability of spinal column, can reduce simultaneously complication such as bone cement seepage in traditional intensifying method, nerve compression, significantly improve clinical therapeutic efficacy, reduce operation risk.
In order to realize above-mentioned task, this utility model is taked following technical solution:
A kind of injectable vertebral pedicle strengthening screw assembly is characterized in that, this injectable pedicle screw assembly is made up of side opening screw, injection device and interior bolt, and use cooperatively interacts;
Described side opening screw is made by the medical titanium alloy material, the side opening screw is by the side opening thread segment, no side opening thread segment and afterbody are formed by connecting, the side opening screw has a central cavity, connect the side opening thread segment, no side opening thread segment and afterbody, the side opening thread segment is the identical cylinder of diameter with no side opening thread segment, both outer surfaces are provided with continuous and highly identical first external screw thread, sharp from following closely on the side opening thread segment, whenever rotate to an angle along the screw thread rotation direction, between adjacent thread, be provided with the side opening that communicates with central cavity successively, central cavity has a circular open at afterbody, and afterbody is one " U " type groove, and its inwall has first female thread;
Described injection device is made by medical macromolecular materials, has certain mechanical strength, formed by dispensing end, injection tube chamber and piston, dispensing end comprises injection head and connecting portion, the diameter of injection head and central cavity are complementary at the circular open of afterbody, and the outer surface of connecting portion is provided with second external screw thread, are complementary with first female thread of afterbody inwall, the injection tube chamber is a cylindrical tube chamber, and piston is formed by connecting by bar portion and handle portion;
Bolt is made by the medical titanium alloy material in described, is made up of the cone of front end and the cylinder of rear end.
Injectable pedicle screw assembly of the present utility model, have four distinguishing features: it is good to detect the nail road behind (1) preparation nail road, not tapping nail road, directly be screwed into the injectable pedicle screw, earlier through having an X-rayed the position of determining screw, if find that the position is not good, before the injection bone cement, adjust the chance of screw position in addition, can reduce the risk that causes the bone cement seepage because screw position is not good and adjust the risk that interior stability maintenance that screw causes descends; (2) compare with traditional method, this invention can increase the metering of the bone cement of sclerotin injection towards periphery, and the stability of screw further is provided; (3) through have an X-rayed determine that the injectable screw position is good after, connect injection device again, under perspective by screw towards periphery sclerotin slowly inject in the process of bone cement, in case can stop injection immediately when finding to have the seepage tendency, the operation leeway of avoiding the bone cement seepage is arranged; (4) bone cement flows to sclerotin on every side by the side opening of screw, being distributed in around the screw of limitation, avoid the tight parcel of bone cement to screw, especially at the pedicle of vertebral arch position, also reduced when screw takes out the destruction to vertebral body and pedicle of vertebral arch when improving screw stability.
Description of drawings
Fig. 1 is the structural representation of side opening screw;
Fig. 2 is the structural representation of injection device;
Fig. 3 is the structural representation of interior bolt;
Fig. 4 is the structural representation of side opening thread segment;
The sketch map that Fig. 5 injection device is connected with the side opening screw;
Fig. 6 is the sketch map that interior bolt inserts the side opening screw;
Fig. 7 (a) is preparation nail road, and Fig. 7 (b) is for being screwed into the side opening screw, and Fig. 7 (c) is for connecting injection device, and Fig. 7 (d) is the injection bone cement, and Fig. 7 (e) is bolt in inserting.
The specific embodiment
Below in conjunction with accompanying drawing this utility model is described in further detail.
Shown in accompanying drawing 1～7, injectable vertebral pedicle strengthening screw assembly of the present utility model is made up of side opening screw 1, injection device 2 and interior bolt 3, and use cooperatively interacts;
Described side opening screw 1 is made by the medical titanium alloy material, side opening screw 1 is by side opening thread segment A, no side opening thread segment B and afterbody C are formed by connecting, side opening screw 1 has a central cavity 11, connect side opening thread segment A, no side opening thread segment B and afterbody C, side opening thread segment A is the identical cylinder of diameter with no side opening thread segment B, both outer surfaces are provided with continuous and highly identical first external screw thread 12, side opening thread segment A goes up from following closely point, whenever rotate to an angle along the screw thread rotation direction, between adjacent thread, be provided with the side opening 13 that communicates with central cavity 11 successively, central cavity 11 has a circular open 14 at afterbody C, afterbody C is one " U " type groove 15, and its inwall has first female thread 16;
D outer diameter 1 and the inner diameter D 2 of side opening screw 1 are respectively 6.5mm and 4.5mm, and the height H 1 of first external screw thread 12 is 1.0mm, and first external screw thread 12 is tapping screw thread, avoid descending because of the screw stability that tapping nail road causes.
The length L 1 of side opening thread segment A is 2.5cm, approximate the length of screw 1 in lumbar vertebra, the length L 2 of the no side opening thread segment B of screw 1 is 2.0cm, approximate the length of screw 1 in pedicle of lumbar vertebral arch, make the position of side opening 13 all be positioned at vertebral body like this, make bone cement concentrate in the vertebral body, and avoid bone cement in the seepage at pedicle of vertebral arch place.
Side opening thread segment A goes up from following closely sharp whenever rotating to an angle along hand of spiral and prepares side opening 13, side opening 13 is all between two adjacent first external screw threads 12, and communicate with central lumen 11, the about 1.5mm of diameter D4 of side opening 13, diameter D4 is too small, the bone cement resistance that flows of sclerotin and the pressure of injection have towards periphery been increased, diameter D4 is excessive, can destroy first external screw thread 12, influence the mechanical strength of screw self, the longitudinal axis of side opening 12 all tilts to the afterbody of side opening screw 1, is about 60 ° with the angle α that becomes of side opening screw 1 longitudinal axis, can make the distributional class around screw of bone cement be similar to " agnail ", can prevent screw loosening, withdraw from.
Can hold hold-down bars in " U " type groove 15 on the afterbody C, first female thread 16 of " U " type groove 15 inwalls is complementary with lock nut, is convenient to keep the stability of whole nail-stick system.
Described injection device 2 is made by medical macromolecular materials, has certain mechanical strength, can bear certain injection pressure, injection device 2 is by dispensing end E, injection tube chamber F and piston G form, dispensing end E comprises injection head 21 and connecting portion 22, the diameter of injection head 21 and central cavity 11 are complementary at the circular open 14 of afterbody C, the outer surface of connecting portion 22 is provided with second external screw thread 23, be complementary with first female thread 16 of afterbody C inwall, injection device 2 and side opening screw 1 are combined closely, guarantee the continuous conduction of pressure in the injection bone cement process, prevent that bone cement is from revealing between the two.
The injection tube chamber F of injection device 2 is a cylindrical tube chamber 24, and wall thickness can bear the pressure when injecting greater than 1.5mm, preventing from injecting tube chamber F breaks, hold injectable bone cement in the cylindrical tube chamber 24, its volume is about 3.0-4.0ml, can satisfy the needed bone cement dosage of strengthening screw.
The piston G of injection device 2 is formed by connecting by bar portion 25 and handle portion 26, and the diameter of bar portion 25 and handle portion 26 is about 1.5cm all, has enough self mechanical strengths, can feed to vasopressing injection in the screw.
Use operation of the present utility model to be illustrated in fig. 7 shown below: at first pedicle prepares nail road Fig. 7 (a) to vertebral body, good through confirming nail position, road, after detecting nail the road not having breakage, side opening screw 1 pedicle is screwed into Fig. 7 in the vertebral body (b), through have an X-rayed determine that side opening screw 1 position is good after, the dispensing end E of injection device 2 is connected with the afterbody C of side opening screw 1, guarantee that injection head 21 enters central cavity 11 fully at the circular open 14 of afterbody C, and second external screw thread 23 and first female thread 16 of " U " type groove 15 inwalls of connecting portion 22 are tightened Fig. 7 (c), under perspective, bone cement is slowly injected vertebral body Fig. 7 (d) then, take off injection device 2, interior bolt 3 is inserted central cavity 11 Fig. 7 (e) of side opening screw 1.
By inserting all the other side opening screws with quadrat method and finishing the injection of bone cement, in to be determined again fixing and bone cement position good after, auxiliary hold-down bars is put into " U " type groove 15 of the afterbody C of side opening screw 1, clamping screw is screwed into " U " type groove 15 and with the locking of first female thread 16, get final product complete operation.
Claims (9)
1. an injectable vertebral pedicle strengthening screw assembly is characterized in that, this injectable pedicle screw assembly is made up of side opening screw (1), injection device (2) and interior bolt (3), and use cooperatively interacts;
Described side opening screw (1) is made by the medical titanium alloy material, side opening screw (1) is by side opening thread segment (A), no side opening thread segment (B) and afterbody (C) are formed by connecting, side opening screw (1) has a central cavity (11), connect side opening thread segment (A), no side opening thread segment (B) and afterbody (C), side opening thread segment (A) is the identical cylinder of diameter with no side opening thread segment (B), both outer surfaces are provided with continuous and highly identical first external screw thread (12), side opening thread segment (A) is gone up from following closely point, whenever rotate to an angle along the screw thread rotation direction, between adjacent thread, be provided with the side opening (13) that communicates with central cavity (11) successively, central cavity (11) has a circular open (14) at afterbody (C), afterbody (C) is one " U " type groove (15), and its inwall has first female thread (16);
Described injection device (2) is made by medical macromolecular materials, injection device (2) is by dispensing end (E), injection tube chamber (F) and piston (G) are formed, dispensing end (E) comprises injection head (21) and connecting portion (22), the diameter of injection head (21) and central cavity (11) are complementary at the circular open (14) of afterbody (C), the outer surface of connecting portion (22) is provided with second external screw thread (23), be complementary with first female thread (16) of afterbody (C) inwall, injection tube chamber (F) is a cylindrical tube chamber (24), and piston (G) is formed by connecting by bar portion (25) and handle portion (26);
Bolt (3) is made by the medical titanium alloy material in described, is made up of the cone (31) of front end and the cylinder (32) of rear end.
2. injectable vertebral pedicle strengthening screw assembly as claimed in claim 1, it is characterized in that, external diameter (D1) and the internal diameter (D2) of described side opening screw (1) are respectively 6.5mm and 4.5mm, and the height (H1) of first external screw thread (12) is 1.0mm, and first external screw thread (12) is tapping screw thread.
3. injectable vertebral pedicle strengthening screw assembly as claimed in claim 1, it is characterized in that, the length (L1) of described side opening thread segment (A) is 2.5cm, approximate the length of side opening screw (1) in lumbar vertebra, the length (L2) of the no side opening thread segment (B) of side opening screw (1) is 2.0cm, approximates the length of side opening screw (1) in pedicle of lumbar vertebral arch.
4. injectable vertebral pedicle strengthening screw assembly as claimed in claim 1, it is characterized in that, described central cavity (11) runs through side opening thread segment (A), no side opening thread segment (B) and the afterbody (C) of side opening screw (1), and the diameter (D3) of central cavity (11) is 1.5mm.
5. injectable vertebral pedicle strengthening screw assembly as claimed in claim 1, it is characterized in that, described side opening thread segment (A) is gone up from following closely sharp whenever rotating to an angle along hand of spiral and is prepared side opening (13), side opening (13) all is positioned between adjacent two first external screw threads (12), and communicate with central lumen (11), the about 1.5mm of diameter (D4) of side opening (13), the longitudinal axis of side opening (13) all tilt to the afterbody of side opening screw (1), are about 60 ° with the angle α that becomes of side opening screw (1) longitudinal axis.
6. injectable vertebral pedicle strengthening screw assembly as claimed in claim 1 is characterized in that, can hold hold-down bars in " U " type groove (15) on the described afterbody (C), and first female thread (16) of " U " type groove (15) inwall is complementary with lock nut.
7. injectable vertebral pedicle strengthening screw assembly as claimed in claim 1, it is characterized in that the injection tube chamber (F) of described injection device (2) is a cylindrical tube chamber (24), wall thickness is greater than 1.5mm, cylindrical tube chamber holds bone cement in (24), and its volume is about 3.0-4.0ml.
8. injectable vertebral pedicle strengthening screw assembly as claimed in claim 1 is characterized in that, the piston (G) of described injection device (2) is formed by connecting by bar portion (25) and handle portion (26), and the diameter of bar portion (25) and handle portion (26) is about 1.5cm all.
9. injectable vertebral pedicle strengthening screw assembly as claimed in claim 1, it is characterized in that, bolt (3) is made up of cone (31) and cylinder (32) in described, the about 0.5cm of length (L3) of cone (31), the about 4.0cm of length (L4) of cylinder (32), the about 1.5mm of external diameter (D5) of interior bolt (3), interior bolt (3) is complementary with the central cavity (11) of side opening screw (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220628309 CN203029370U (en) | 2012-11-26 | 2012-11-26 | Injectable vertebral pedicle strengthening screw component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220628309 CN203029370U (en) | 2012-11-26 | 2012-11-26 | Injectable vertebral pedicle strengthening screw component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203029370U true CN203029370U (en) | 2013-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220628309 Expired - Fee Related CN203029370U (en) | 2012-11-26 | 2012-11-26 | Injectable vertebral pedicle strengthening screw component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203029370U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102940523A (en) * | 2012-11-26 | 2013-02-27 | 中国人民解放军成都军区总医院 | Assembly for reinforcing injectable vertebral pedicle screw |
-
2012
- 2012-11-26 CN CN 201220628309 patent/CN203029370U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102940523A (en) * | 2012-11-26 | 2013-02-27 | 中国人民解放军成都军区总医院 | Assembly for reinforcing injectable vertebral pedicle screw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20141126 |
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| EXPY | Termination of patent right or utility model |