CN207912749U - Static(al) pressurization anti-back hollow screw device - Google Patents
Static(al) pressurization anti-back hollow screw device Download PDFInfo
- Publication number
- CN207912749U CN207912749U CN201720445692.XU CN201720445692U CN207912749U CN 207912749 U CN207912749 U CN 207912749U CN 201720445692 U CN201720445692 U CN 201720445692U CN 207912749 U CN207912749 U CN 207912749U
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- Prior art keywords
- nut
- thread
- external screw
- screw rod
- static
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Abstract
The utility model is related to a kind of static(al) pressurization anti-back hollow screw devices, it is characterised in that：Including screw rod and double thread nut, the screw rod front is equipped with head external screw thread, screw rod rear portion is equipped with tail portion external screw thread, and the endoporus of the double thread nut is equipped with is equipped with nut external screw thread with the matched nut inner thread of tail portion external screw thread, the periphery wall of double thread nut.The utility model by hollow screw is arranged to include screw rod and nut separate structure, the pressurization of fracture site static(al) may be implemented, reduce cutting of the screw head external screw thread to cancellous bone；Nut external screw thread can be with femoral cortex bone biting, it is therefore prevented that moves back the generation of nail；Nut inner thread can realize pressurization with the externally threaded screw rod cooperation in head, final to realize that femoral head is fixed with femoral shaft integrated frame, reduce the generation of femoral head rotation.
Description
Technical field
The utility model is related to the devices for fracture of neck of femur reduction fixation that a kind of orthopaedic trauma uses, specifically
Say it is a kind of static(al) pressurization anti-back hollow screw device, belongs to the field of medical instrument technology.
Background technology
Interior fixation is a kind of irreplaceable in the treatment fractured near end of thighbone such as fracture of neck of femur and intertrochanter fracture of femur
Important method.Cannulated compression screw resected femur fractured near end surgical procedure is easy, and topography detaches less, operating time
Short, simultaneously because its chorista is few, notch is small, therefore intraoperative hemorrhage is less, and perioperative blood transfusion number of cases and transfusion volume are less, and office
Portion's tissue injury is small, also makes postoperative CRP levels relatively low.
It is found in clinical treatment, conventional cannulated compression screw is primarily present following defect in Clinical practice at present：
(1), pressuring method is dynamic pressurization in art, ailhead end screw thread easily occurs and cuts cause screw hold decline repeatedly with cancellous bone；
(2), postoperative to be easy to move back nail.To overcome the problems, such as above-mentioned conventional hollow forcing screw, and occur immersing oneself in the hollow spiral shell of Bidirectional-pressure
Nail, but immerse oneself in bidirectional hollow forcing screw and had the following defects in Clinical practice：(1), pressuring method still adds for power in art
Easily there is ailhead end screw thread and cuts cause screw hold decline repeatedly with cancellous bone in pressure；(2), the nail tail diameter of thread gradually increases,
It is relatively difficult to be screwed into cortex bone；(3), postoperative to take nail difficult.
Invention content
The purpose of the utility model is to overcome the deficiencies in the prior art, and fracture site can be realized by providing one kind
Static(al) pressurizes, and can be in the static(al) pressurization anti-back hollow screw device for pressurizeing while preventing screw from retreating.
According to technical solution provided by the utility model：Static(al) pressurization anti-back hollow screw device, it is characterised in that：Including
Screw rod and double thread nut, the screw rod front are equipped with head external screw thread, and screw rod rear portion is equipped with tail portion external screw thread, the double thread
The endoporus of nut, which is equipped with, to be equipped with the matched nut inner thread of tail portion external screw thread, the periphery wall of double thread nut outside nut
Screw thread.
The nut external screw thread and nut inner thread are mutually opposing setting as a further improvement of the utility model,
Double thread nut can drive screw rod to move out into bone by nut external screw thread when precession.
The externally threaded helical pitch of the nut is more than the helical pitch of nut inner thread as a further improvement of the utility model,.
The ratio between helical pitch of the nut external screw thread and nut inner thread is (1.5 as a further improvement of the utility model,
~2.5)：1.
The tail end of the double thread nut is equipped with spacing head as a further improvement of the utility model,.
The tail end end face of the double thread nut is equipped with Hexagon hole as a further improvement of the utility model,.
The tail end end face of the screw rod is equipped with Hexagon hole as a further improvement of the utility model,.
The screw rod and double thread nut are made of titanium alloy material as a further improvement of the utility model,.
The utility model compared with prior art, has the following advantages that：
1), the utility model by hollow screw is arranged to include screw rod and nut separate structure, may be implemented
Fracture site static(al) pressurizes, and reduces cutting of the screw head external screw thread to cancellous bone；
2), the double thread nut of the utility model devises double thread, nut external screw thread can with femoral cortex bone biting,
Prevent the generation for moving back nail；Nut inner thread can realize pressurization with the externally threaded screw rod cooperation in head, final real
Existing femoral head is fixed with femoral shaft integrated frame, reduces the generation of femoral head rotation.
Description of the drawings
Fig. 1 is the structural front view of the utility model embodiment.
Fig. 2 is the sectional view along A-A of screw rod in Fig. 1.
Fig. 3 is the left view of double thread nut in Fig. 1.
Fig. 4 is the right view of the double thread nut of Fig. 1.
The dimensional structure diagram of double thread nut in Fig. 5 the utility model embodiments.
Fig. 6 is the applicable cases schematic diagram of the utility model embodiment.
Reference sign：1- screw rods, the heads 1a- external screw thread, the tail portions 1b- external screw thread, 2- double threads nut, 2a- nuts
Internal thread, 2b- nuts external screw thread, 2c- nut spacing heads, 3- cancellous bone of femoral head, 4- femoral shaft cortex bones.
Specific implementation mode
With reference to specific drawings and examples, the utility model is described in further detail.
As shown in Figure 1, a kind of static(al) pressurization anti-back hollow screw device is disclosed in embodiment, mainly by 1 He of screw rod
Double thread nut 2 forms, and 1 front of the screw rod is equipped with head external screw thread 1a, and 1 rear portion of screw rod is equipped with tail portion external screw thread 1b, described
The endoporus of double thread nut 2 is equipped with and the matched nut inner thread 2a of tail portion external screw thread 1b, the periphery wall of double thread nut 2
It is equipped with nut external screw thread 2b.
As shown in fig. 6, when specifically used, first screw rod 1 is screwed into the femoral head of patient, then by rotating double thread
Nut 2 pressurizes【Arrow direction is compression aspect in figure】, the head external screw thread 1a of screw rod 1 is static when pressurization, main
The cooperation leaned between the tail portion external screw thread 1b of 1 rear end nut inner thread 2a and screw rod of double thread nut 2 is broken to realize to fracture
Pressurization between end, so as to greatly reduce cuttings of the 1 head external screw thread 1a of screw rod to cancellous bone 3.Pass through spiral shell simultaneously
Female external screw thread 2b realizes the fixation between double thread nut 2 and femoral shaft cortex bone 4, prevents screw from retreating, to reach simultaneously
The fixation of fracture site, the purpose pressurizeed and prevent screw from retreating, for the healing of patient femur's fracture of cervical vertebra provide reliable guarantee.
As shown in fig. 1~fig. 5, in the present embodiment, the nut external screw thread 2b on the double thread nut 2 and nut inner thread
2a is mutually opposing setting, and double thread nut 2 can drive screw rod 1 to outward transport into bone by nut external screw thread 2b when precession
It is dynamic.Screw rod 1 can be driven to move out by inside precession double thread nut 2 in this way, realize the pressurization of fracture site static(al), subtract
1 head external screw thread 1a of screw rod is lacked【It is equivalent to the ailhead end screw thread of conventional hollow screw】Cutting to cancellous bone 3, it can be ensured that
The hold of hollow screw.
In the utility model, the helical pitch of the nut external screw thread 2b is more than the helical pitch of nut inner thread 2a.It can make in this way
Even if it is poor that double thread nut 2 and screw rod 1 rotate synchronously that there is also helical pitches, is conducive to double thread nut 2 and is screwed into femoral shaft cortex bone 4
When avoid fracture site from excessively pressurizeing.
In the present embodiment, the ratio between the helical pitch of the nut external screw thread 2b and nut inner thread 2a【I.e. double thread nut 2 rotates
The ratio of distances constant that the distance of the one inside precession of circle exits outward with screw rod 1】It is preferably arranged to 2：1, in actual production manufacture, institute
State the ratio between helical pitch of nut external screw thread 2b and nut inner thread 2a can flexible design as the case may be, generally【1.5~
2.5】：1.
As shown in Fig. 3~Fig. 5, in the present embodiment, the tail end of the double thread nut 2 is equipped with spacing head 2c, in this way can be with
It avoids double thread nut 2 from being screwed into bones, facilitates and later take interior fixed operation.The tail end end face of the double thread nut 2
It is equipped with Hexagon hole, can be coordinated in this way with allen driver, facilitate dismounting.
As shown in Fig. 2, in the present embodiment, the tail end end face of the screw rod 1 is equipped with Hexagon hole, in this way also for
Allen driver is coordinated, and dismounting is facilitated.It should be noted that on the tail end end face of the double thread nut 2 and screw rod 1
Hexagon hole be also designed to other structures form, such as plum blossom, cross, a word, these simple structures are replaced still
Belong to the protection domain of the application.
In the present embodiment, the screw rod 1 and double thread nut 2 are preferably made of titanium alloy material.
Claims (7)
- The anti-back hollow screw device 1. static(al) pressurizes, including screw rod (1) and double thread nut (2), screw rod (1) front are equipped with Head external screw thread (1a), screw rod (1) rear portion are equipped with tail portion external screw thread (1b), and the endoporus of the double thread nut (2) is equipped with and institute Tail portion external screw thread (1b) matched nut inner thread (2a) is stated, the periphery wall of double thread nut (2) is equipped with nut external screw thread (2b)；It is characterized in that：The nut external screw thread (2b) is mutually opposing setting, double thread nut with nut inner thread (2a) (2) screw rod (1) can be driven to move out when precession into bone by nut external screw thread (2b).
- The anti-back hollow screw device 2. static(al) as described in claim 1 pressurizes, it is characterised in that：The nut external screw thread (2b) Helical pitch be more than nut inner thread (2a) helical pitch.
- The anti-back hollow screw device 3. static(al) as described in claim 1 pressurizes, it is characterised in that：The nut external screw thread (2b) It is (1.5~2.5) with the ratio between the helical pitch of nut inner thread (2a)：1.
- The anti-back hollow screw device 4. static(al) as described in claim 1 pressurizes, it is characterised in that：The double thread nut (2) Tail end be equipped with spacing head (2c).
- The anti-back hollow screw device 5. static(al) as described in claim 1 pressurizes, it is characterised in that：The double thread nut (2) Tail end end face be equipped with Hexagon hole.
- The anti-back hollow screw device 6. static(al) as described in claim 1 pressurizes, it is characterised in that：The tail end of the screw rod (1) End face is equipped with Hexagon hole.
- The anti-back hollow screw device 7. static(al) as described in claim 1 pressurizes, it is characterised in that：The screw rod (1) and double spiral shells Line nut (2) is made of titanium alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720445692.XU CN207912749U (en) | 2017-04-25 | 2017-04-25 | Static(al) pressurization anti-back hollow screw device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720445692.XU CN207912749U (en) | 2017-04-25 | 2017-04-25 | Static(al) pressurization anti-back hollow screw device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207912749U true CN207912749U (en) | 2018-09-28 |
Family
ID=63611407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720445692.XU Expired - Fee Related CN207912749U (en) | 2017-04-25 | 2017-04-25 | Static(al) pressurization anti-back hollow screw device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207912749U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112603517A (en) * | 2020-12-04 | 2021-04-06 | 无锡市第九人民医院 | Hollow bidirectional threaded nail used in fracture treatment process |
| CN112716585A (en) * | 2020-12-30 | 2021-04-30 | 北京中安泰华科技有限公司 | Anti-rotation anti-retreat double-thread hollow nail |
-
2017
- 2017-04-25 CN CN201720445692.XU patent/CN207912749U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112603517A (en) * | 2020-12-04 | 2021-04-06 | 无锡市第九人民医院 | Hollow bidirectional threaded nail used in fracture treatment process |
| CN112716585A (en) * | 2020-12-30 | 2021-04-30 | 北京中安泰华科技有限公司 | Anti-rotation anti-retreat double-thread hollow nail |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180928 Termination date: 20200425 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |