CN109938819A - Pedicle screw - Google Patents
Pedicle screw Download PDFInfo
- Publication number
- CN109938819A CN109938819A CN201910237128.2A CN201910237128A CN109938819A CN 109938819 A CN109938819 A CN 109938819A CN 201910237128 A CN201910237128 A CN 201910237128A CN 109938819 A CN109938819 A CN 109938819A
- Authority
- CN
- China
- Prior art keywords
- screw
- pedicle
- pedicle screw
- threaded rod
- straight portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007704 transition Effects 0.000 claims description 7
- 230000004323 axial length Effects 0.000 claims description 3
- 210000000988 bone and bone Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 206010065687 Bone loss Diseases 0.000 description 1
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 208000020307 Spinal disease Diseases 0.000 description 1
- 208000007103 Spondylolisthesis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 108010048734 sclerotin Proteins 0.000 description 1
- 230000036262 stenosis Effects 0.000 description 1
- 208000037804 stenosis Diseases 0.000 description 1
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- Surgical Instruments (AREA)
Abstract
The invention provides a pedicle screw, wherein the screw body of the screw is a threaded rod with external threads, the threaded rod is in a step shape and is provided with a plurality of sections of straight parts, the adjacent straight parts are connected by an inclined surface part, and the diameter of the threaded rod is gradually reduced from the position close to the screw head to the direction far away from the screw head. Compared with the traditional conical screw rod, the invention adopts the design of the stepped screw rod, and can reduce the reduction of the holding force of the screw rod after a small amount of screw rod is withdrawn in the operation.
Description
Technical field
The present invention relates to medical instruments fields, and in particular to a kind of pedicle screw.
Background technique
It is that treatment fracture of lumbar vertebra, spinal canal stenosis, lumber spondylolisthesis etc. are common that pedicle screw system, which implements pedicle screw internal fixation,
The operation method of spinal disease.In art, in the lumbar motion segment merging Kirschner wire positioning treated, it is screwed into after accurate positioning
The suitable pedicle nail of thickness.The screw design of existing some pedicle screws is usually taper, in actual operation, pedicle of vertebral arch
After screw is screwed into, often because a variety of causes needs to readjust the screw-in depth of pedicle screw, half-turn is such as moved back outward to a circle, slightly
After micro- back-out, then it will will appear gap at screw-bone interface, and reduce the holding power between screw-bone interface, easily lead to merging
Pedicle screw loosen, influence the recovery of patient.
Summary of the invention
The technology for easily occurring the holding power decline between screw-bone interface when adjusting position for conventional pedicle screws is asked
Topic, the invention proposes a kind of pedicle screws, after moving back nail on a small quantity, still are able to guarantee that screw-bone interface largely keeps tight
Contiguity touching, the significant loss of no holding power.
To achieve the above object, pedicle screw proposed by the present invention, the nail of the screw is as with externally threaded spiral shell
Rasp bar, the threaded rod is stepped, has more piece straight portion, is connected between the adjacent straight portion by chamfered portion,
The diameter of threaded rod close to head of screw to the direction far from head of screw from gradually becoming smaller.
Wherein, traditional cone cell screw is compared, after moving back nail on a small quantity, there are gap, we with bone interface for entire threaded rod
Ladder-like threaded rod is used in case, after moving back nail on a small quantity in art, only occurs gap, Neng Gou between chamfered portion and bone interface
On a small quantity move back nail operation after, effectively avoid the holding power between screw-bone interface from being remarkably decreased, can extend pedicle screw loosening when
Between, mitigate patient suffering.In addition, by chamfered portion transition and linkage, during into nail, chamfered portion between adjacent straight portion
Extruding sclerotin can be compacted, further increase the holding power that screw-bone interface is shown in.
Preferably, in the pedicle screw, the threaded rod is divided into the first thread rod part interconnected and
Two thread rod parts, first thread rod part have a section straight portion, the first threaded rod position after merging close to head of screw
In pedicle of vertebral arch position, for holding pedicle of vertebral arch cortex；Second thread rod part, has at least two section straight portions, and flat part divides it
Between transition is connected by chamfered portion, the second thread rod part is located at centrum position after merging, and the second thread rod part, should in step type
It designs more reasonable on bone loss and stress distribution.
Preferably, in the pedicle screw, by inclined-plane between first thread rod part and the second thread rod part
Part is connected.
Preferably, in the pedicle screw, the straight portion and chamfered portion of the threaded rod all have outer spiral shell
Line.
Preferably, in the pedicle screw, the axial length ratio of the chamfered portion and straight portion is 1:
10~1:1.
Preferably, in the pedicle screw, the straight portion and chamfered portion are round-corner transition.
Compared with prior art, it beneficial effects of the present invention: is designed using ladder-like threaded rod, compares traditional cone screw
Bar after moving back nail on a small quantity in art, can reduce the decline of screw rod holding power.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pedicle screw in the present invention；
Fig. 2 is the schematic diagram that pedicle screw moves back nail on a small quantity in the present invention；
Fig. 3 is the schematic diagram that pedicle screw moves back nail on a small quantity in the prior art.
In figure: 1- head of screw, 2- follow closely body, 21- straight portion, 22- chamfered portion, the first thread rod part of A1-, A2- second
Thread rod part.
Specific embodiment
Pedicle screw of the invention is described in more detail below in conjunction with schematic diagram, which show the present invention
Preferred embodiment, it should be appreciated that those skilled in the art can modify invention described herein, and still realize the present invention
Advantageous effects.Therefore, following description should be understood as the widely known of those skilled in the art, and be not intended as pair
Limitation of the invention.
As shown in Figure 1, pedicle screw include head of screw 1 and nail body 2, nail body 2 be with externally threaded threaded rod, and should
Threaded rod is integrally stepped, has more piece straight portion 21, is connected between adjacent straight portion 21 by chamfered portion 22, straight
Part 21 and the junction of chamfered portion 22 use round-corner transition, and straight portion 21 and chamfered portion 22 all have external screw thread.
The diameter of the threaded rod close to head of screw 1 to the direction far from head of screw 1 from gradually becoming smaller, for convenient for setting nail, the nail body 2 is separate
One end of head of screw 1 can be tip, and certainly, tip can do Passivation Treatment, to reduce the damage to centrum.
Specifically, which can be divided into two sections according to the difference of implantation site.Referring to fig. 2, threaded rod is divided into mutually
The the first thread rod part A1 and the second thread rod part A2, the first thread rod part A1 of connection only have a section close to head of screw 1
Straight portion 21, the first thread rod part A1 is located at pedicle of vertebral arch position after merging；Second thread rod part A2, it is stepped, have
At least two section straight portions 21, by 22 transition and linkage of chamfered portion between straight portion 21, the second thread rod part A2 after merging
Positioned at centrum position.As a preferred embodiment, the axial length ratio of chamfered portion 22 and straight portion 21 is 1:10~1:1.
The pedicle screw can be reduced the decline of bone-nail section holding power, principle can be found in Fig. 2 when moving back nail on a small quantity
And Fig. 3, Fig. 3 be when illustrating that cone screw moves back nail on a small quantity in the prior art, when moving back half-turn or a circle, between screw and bone interface
There is gap a within the scope of entire nail body length；And the ladder-like screw that the present embodiment proposes only exists when moving back nail on a small quantity
There is a small amount of gap b in chamfered portion, i.e. shoulder position, remaining position, screw and bone are still in state is fitted closely, such as Fig. 2 institute
Show.As a result, according to fig. 2 with the comparison of Fig. 3, it will be evident that in art on a small quantity move back nail operation after, the present embodiment propose ladder
Shape screw can effectively reduce the pore volume between screw-bone interface, and then can be avoided bone-nail section holding power and be remarkably decreased.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (6)
1. a kind of pedicle screw, the nail body (2) of the screw is with externally threaded threaded rod, which is characterized in that the spiral shell
Rasp bar is stepped, has more piece straight portion (21), is connected between the adjacent straight portion (21) by chamfered portion (22),
The diameter of threaded rod close to head of screw (1) to the direction far from head of screw (1) from gradually becoming smaller.
2. pedicle screw according to claim 1, which is characterized in that the threaded rod is divided into the first spiral shell interconnected
Rasp bar portion (A1) and the second thread rod part (A2), first thread rod part (A1) have a section flat part close to head of screw (1)
Divide (21), the first thread rod part (A1) is located at pedicle of vertebral arch position after merging；Second thread rod part (A2) is flat at least two sections
Directly partially (21), it is connected transition, the position the second thread rod part (A2) after merging by chamfered portion (22) between straight portion (21)
In centrum position.
3. pedicle screw according to claim 1, which is characterized in that first thread rod part (A1) and the second screw thread
It is connected between bar portion (A2) by chamfered portion (22).
4. pedicle screw according to claim 1, which is characterized in that the straight portion (21) and inclined-plane of the threaded rod
Partially (22) all have external screw thread.
5. pedicle screw according to claim 1, which is characterized in that the chamfered portion (22) and straight portion (21)
Axial length ratio be 1:10~1:1.
6. any one pedicle screw described according to claim 1~5, which is characterized in that the straight portion (21) with
Chamfered portion (22) is round-corner transition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237128.2A CN109938819A (en) | 2019-03-27 | 2019-03-27 | Pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237128.2A CN109938819A (en) | 2019-03-27 | 2019-03-27 | Pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109938819A true CN109938819A (en) | 2019-06-28 |
Family
ID=67011994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910237128.2A Pending CN109938819A (en) | 2019-03-27 | 2019-03-27 | Pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109938819A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112716589A (en) * | 2021-01-05 | 2021-04-30 | 上海睿触科技有限公司 | Novel bone nail structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020016594A1 (en) * | 1998-11-26 | 2002-02-07 | Schlapfer Fridolin J. | Bone screw |
| US20050038438A1 (en) * | 2003-08-11 | 2005-02-17 | Depuy Acromed, Inc. | Distraction screw |
| CN210472251U (en) * | 2019-03-27 | 2020-05-08 | 上海市浦东新区公利医院(第二军医大学附属公利医院) | Pedicle screw |
-
2019
- 2019-03-27 CN CN201910237128.2A patent/CN109938819A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020016594A1 (en) * | 1998-11-26 | 2002-02-07 | Schlapfer Fridolin J. | Bone screw |
| US20050038438A1 (en) * | 2003-08-11 | 2005-02-17 | Depuy Acromed, Inc. | Distraction screw |
| CN210472251U (en) * | 2019-03-27 | 2020-05-08 | 上海市浦东新区公利医院(第二军医大学附属公利医院) | Pedicle screw |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112716589A (en) * | 2021-01-05 | 2021-04-30 | 上海睿触科技有限公司 | Novel bone nail structure |
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