CN203988326U - A kind of hollow forcing screw - Google Patents
A kind of hollow forcing screw Download PDFInfo
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- CN203988326U CN203988326U CN201420379119.XU CN201420379119U CN203988326U CN 203988326 U CN203988326 U CN 203988326U CN 201420379119 U CN201420379119 U CN 201420379119U CN 203988326 U CN203988326 U CN 203988326U
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Abstract
This utility model has disclosed a kind of hollow forcing screw, the column structure that it is axial hollow, and the appearance full width that its principal character is this screw is provided with the screw thread that becomes tooth distance, and screw tail end is provided with and coordinates the hidden type notch joining with external instrument.And the screw thread of above-mentioned change tooth distance is understood and be should be more clearly: apart from being, 0.05mm's tooth of screw thread successively decreases and the width of thread is successively decreased.In addition the radial diameter at this screw tail end place is greater than the radial diameter of screw body and screw stem.Apply compression screws of the present utility model, after guiding screws in fracture site, because the thread pitch of screw tail end diminishes, the width of thread also attenuates, make with the combination of intact skeleton closelyr, promoted pressurization stress equilibrium and the persistency of screw to fracture site in conjunction with full thread design.
Description
Technical field
This utility model relates to a kind of hollow nail, relates in particular to a kind ofly to continue and exert pressure and make the hollow nail of its clamping for the bone wrecking being carried out to physics, belongs to field of medical device technology.
Background technology
Clinically, for the fracture at the positions such as patella, olecroanon, medial and lateral malleolus, greater tubercles of humerus, conventionally adopt Kirschner wire needles combined with tension band technique for fixing, it is made up of Kirschner wire and steel wire, fix piercing two Kirschner wires after the reduction of the fracture, the syringe needle of two Kirschner wires all passes cortex, two backshank bendings respectively, between two syringe needles outside cortical bone and two backshanks, be the figure of eight with steel wire and be wound around being exposed to again, the tension side that makes to fracture lock and is pressurizeed and fix.This technology is simple and practical, is widely used clinically, but exists following not enough: 1) Kirschner wire itself is smooth, cannot implement initial press to fracture site, and easily occur the withdraw of the needle phenomenon when postoperative function exercise; 2) syringe needle, backshank expose cortical bone, not only can cause that local soft tissue irritable inflammation causes pain, and the postoperative skin bulge that often makes, and affect attractive in appearance and subjective feeling.Given this, someone adopts hollow half-thread screw to replace Kirschner wire, after the reduction of the fracture is fixed with Kirschner wire location, taking Kirschner wire as guiding, screw is screwed in after fracture site, then take out Kirschner wire by hollow half-thread screw inner chamber.This hollow half-thread screw is made up of head, body and afterbody, and the diameter of its inner chamber mates with the thickness of Kirschner wire, and screw head is provided with tapping screw thread, the smooth screw thread of not establishing of body, the bulging of screw afterbody, end face is provided with interior hexagonal groove so that with hex(agonal)screw cutter screw in screw.
But hollow half-thread screw to fracture site carry out interior fixing after along with the passing of movable and time still exists easily looseningly or move back the defect of nail, the effect of pressurizeing cannot satisfy the demands.
Summary of the invention
The purpose of this utility model is to solve above-mentioned technical problem, proposes a kind of hollow forcing screw.
Above-mentioned purpose of the present utility model, to be achieved by the following technical programs: a kind of hollow forcing screw, for the column structure of axial hollow, it is characterized in that: the appearance full width of described screw is provided with the screw thread that becomes tooth distance, and screw tail end is provided with and coordinates the hidden type notch joining with external instrument.
Further, apart from being, 0.05mm's tooth that screw thread is established in described screw tail end place successively decreases and the width of thread is successively decreased.
Further, the radial diameter at described screw tail end place is greater than the radial diameter of screw body and screw stem.
Further, described screw stem is provided with the edge of a knife.
The beneficial effects of the utility model are mainly reflected in: this hollow forcing screw is after guiding screws in fracture site, because the thread pitch of screw tail end diminishes, the width of thread also attenuates, make with the combination of intact skeleton closelyr, promoted pressurization stress equilibrium and the persistency of screw to fracture site in conjunction with full thread design.
Brief description of the drawings
Fig. 1 is the structural representation of the hollow forcing screw of this utility model.
Detailed description of the invention
Below just accompanying drawing in conjunction with the embodiments, is described in further detail detailed description of the invention of the present utility model, so that technical solutions of the utility model are easier to understand, grasp.
As shown in Figure 1, the column structure that a kind of hollow forcing screw the utility model proposes is axial hollow, its architectural feature visualization, the appearance full width of this screw 1 is provided with the screw thread 11a that becomes tooth distance ... 11n ..., and screw 1 tail end is provided with and coordinates the hidden type notch 12 joining with external instrument.The so-called tooth distance that becomes, in fact espespecially the diminishing gradually of screw tail end place ridge distance, and the width shape of screw thread changes slightly.
From the better enforcement of this utility model one, apart from being, 0.05mm's tooth that screw thread is established in above-mentioned screw tail end place successively decreases and the width of thread is successively decreased (intuitively thinner), as shown in Figure 1.Thus, along with continuous screw-in and the screw-in depth of screw diminish gradually, realize thus the appropriateness pressurization to fracture portions, avoid making skeletogenous secondary and destroy.
From illustrating, the radial diameter at the tail end place of this screw is greater than the radial diameter of screw body and screw stem, will more be conducive to fixedlying positioning after screw screw-in like this.In addition, screw stem is provided with the edge of a knife, owing to being hollow nail, cannot adopt conventional tip as hole structure, and this edge of a knife design is intended to be convenient to this type of hollow forcing screw and screws in skeleton.
The beneficial effects of the utility model are mainly reflected in: this hollow forcing screw is after guiding screws in fracture site, because the thread pitch of screw tail end diminishes, the width of thread also attenuates, make with the combination of intact skeleton closelyr, promoted pressurization stress equilibrium and the persistency of screw to fracture site in conjunction with full thread design.
In addition to the implementation, this utility model can also have other embodiment.All employings are equal to the technical scheme of replacement or equivalent transformation formation, within all dropping on this utility model scope required for protection.
Claims (4)
1. a hollow forcing screw, is the axial column structure of hollow, it is characterized in that: the appearance full width of described screw is provided with the screw thread that becomes tooth distance, and screw tail end is provided with and coordinates the hidden type notch joining with external instrument.
2. hollow forcing screw according to claim 1, is characterized in that: the tooth of screw thread is established in described screw tail end place, and apart from being, 0.05mm successively decreases and the width of thread is successively decreased.
3. hollow forcing screw according to claim 1, is characterized in that: the radial diameter at described screw tail end place is greater than the radial diameter of screw body and screw stem.
4. hollow forcing screw according to claim 1, is characterized in that: described screw stem is provided with the edge of a knife.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420379119.XU CN203988326U (en) | 2014-07-10 | 2014-07-10 | A kind of hollow forcing screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420379119.XU CN203988326U (en) | 2014-07-10 | 2014-07-10 | A kind of hollow forcing screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203988326U true CN203988326U (en) | 2014-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420379119.XU Active CN203988326U (en) | 2014-07-10 | 2014-07-10 | A kind of hollow forcing screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203988326U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105232129A (en) * | 2015-11-06 | 2016-01-13 | 上海凯利泰医疗科技股份有限公司 | Fixing device for patella fracture |
| CN108703796A (en) * | 2018-06-08 | 2018-10-26 | 创美得医疗器械（天津）有限公司 | Explosion-proof compressive hollow screw without a head |
| CN110996821A (en) * | 2017-08-14 | 2020-04-10 | 祖尔格布莱特有限公司 | Bone screw |
-
2014
- 2014-07-10 CN CN201420379119.XU patent/CN203988326U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105232129A (en) * | 2015-11-06 | 2016-01-13 | 上海凯利泰医疗科技股份有限公司 | Fixing device for patella fracture |
| CN110996821A (en) * | 2017-08-14 | 2020-04-10 | 祖尔格布莱特有限公司 | Bone screw |
| CN108703796A (en) * | 2018-06-08 | 2018-10-26 | 创美得医疗器械（天津）有限公司 | Explosion-proof compressive hollow screw without a head |
| WO2019242300A1 (en) * | 2018-06-08 | 2019-12-26 | 创美得医疗器械（天津）有限公司 | Anti-burst headless compression hollow screw |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |