CN203089347U - Anti-wire-sliding bone-screw and screw removing device - Google Patents
Anti-wire-sliding bone-screw and screw removing device Download PDFInfo
- Publication number
- CN203089347U CN203089347U CN 201320106331 CN201320106331U CN203089347U CN 203089347 U CN203089347 U CN 203089347U CN 201320106331 CN201320106331 CN 201320106331 CN 201320106331 U CN201320106331 U CN 201320106331U CN 203089347 U CN203089347 U CN 203089347U
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- screw
- groove
- bone
- bone screw
- connecting rod
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Abstract
The utility model relates to an anti-wire-sliding bone-screw and a screw removing device. The anti-wire-sliding bone-screw comprises a screw rod and a screw cap, a self-tapping thread portion is arranged on the screw rod, a line-shaped or cross-shaped groove is formed in the screw cap, and the end portions of the groove protrude outwards and are provided with protruded groove portions. The screw removing device comprises a handle, a connecting rod and a tool bit, the handle is arranged at one end of the connecting rod, the tool bit is fixed at the other end of the connecting rod in a protruded mode, and the tool bit is of a Z-shaped or Awastika-shaped structure matched with the groove and the protruded groove portions. According to the anti-wire-sliding bone-screw and the screw removing device, the groove formed in the screw cap and the protruded groove portions arranged on the end portions of the periphery of the groove in a protruded mode are matched with a tool bit structure of the removing device, the contact area of the tool bit and the screw cap is increased, therefore the bone-screw can be removed easily, and the problem that the bone-screw can not be removed easily because the bone-screw can slide easily in the process of screwing out of the bone-screw can be solved.
Description
Technical field
This utility model relates to technical field of medical instruments, especially relates to a kind of anti-stripped thread bone screw and screw withdrawing device.
Background technology
Plate screw internal fixation technology has been widely used in the multiple fracture operation of orthopaedics, but because clinical use bone screw mostly is Metal Substrate, bone screw combines closely with osseous tissue after through half a year even time several years, and be subjected to the corrosion of tissue fluid, and the groove of the existing a large amount of interior hexagonal murices heads of a nail that use becomes smooth through the wearing and tearing of operation for the first time, get nail and the phenomenon of stripped thread very easily occurs, then easily cause the head of a nail to break even broken nail if get nail by force.Simultaneously, bone surgery position multiposition is darker, and soft tissues such as muscle are arranged on every side, and exposed space is limited.Use apparatus commonly used such as vice, needle-nose pliers, often get the nail difficulty, and easily cause the damage of surrounding soft tissue because of the jaw hold causes inadequately.Use the method for key reaming that bone screw is taken out, certainly will damage, operating time is prolonged, increased patient's misery, and easily cause fracture once more the backbone.Along with the application of less invasive techniques,, be necessary the screw and the screw withdrawing device that use in the bone surgery are improved for reaching the purpose of disturbing the therapeutic effect that reaches best with the invasion and attack of minimum and minimum physiology in the orthopaedics field.
The utility model content
Based on this, being necessary provides a kind of anti-stripped thread bone screw and screw withdrawing device at the problem of above-mentioned background technology existence, and skidding easily when screwing out with the solution bone screw is difficult for the problem of taking-up.
For achieving the above object, the utility model discloses a kind of anti-stripped thread bone screw, it comprises shank of screw and screw cap, has tapping screw thread portion on the described shank of screw, and described screw cap offers font groove, and described groove ends is all outwards protruded the tongue portion that is provided with.
Among embodiment, described groove is " one " font or " ten " glyph construction therein.
Among embodiment, described groove and tongue portion combined shaped are " Z " font Huo “ Swastika therein " glyph construction.
For achieving the above object, the utility model discloses a kind of screw withdrawing device, it comprises handle, connecting rod and cutter head, described handle is arranged on described connecting rod one end, described cutter head protrudes out and is fixed on the described connecting rod other end, and described cutter head is the Z that matches with groove and tongue portion " font Huo “ Swastika " glyph construction.
Therein among embodiment, described cutter head height and depth of groove coupling.
In sum, anti-stripped thread bone screw of this utility model and screw withdrawing device are by offering groove at screw cap, and all outwards protrude the tongue portion that is provided with along groove periphery end, the cutter head structure of attachment screw withdrawing device, increase the contact area of cutter head and screw cap, can easily take out bone screw, solve bone screw and when screwing out, skidded easily and be difficult for the problem of taking out.
Description of drawings
Fig. 1 is the structural representation of the anti-stripped thread bone screw of this utility model.
Fig. 2 is the vertical view of the anti-stripped thread bone screw of this utility model shown in Figure 1.
Fig. 3 is the structural representation of this utility model screw withdrawing device.
Fig. 4 is the enlarged diagram of this utility model screw withdrawing device cutter head shown in Figure 3.
The specific embodiment
For further understanding feature of the present utility model, technological means and the specific purposes that reached, function, this utility model is described in further detail below in conjunction with the accompanying drawing and the specific embodiment.
As shown in Figures 1 to 4, the anti-stripped thread bone screw of this utility model comprises shank of screw 10 and screw cap 20, has tapping screw thread portion 11 on the described shank of screw 10, described screw cap 20 offers font groove 21, the tongue portion 22 that is provided with is all outwards protruded in described groove 21 peripheral ends, described groove 21 is " one " font or " ten " glyph construction, and described groove 21 is " Z " font Huo “ Swastika with tongue portion 22 combined shaped " glyph construction.
This utility model screw withdrawing device comprises handle 30, connecting rod 40 and cutter head 50, described handle 30 is arranged on described connecting rod 40 1 ends, described cutter head 50 protrudes out and is fixed on described connecting rod 40 other ends, described cutter head 50 is the Z that matches with groove 21 and tongue portion 22 " font Huo “ Swastika " glyph construction, described cutter head 50 height mate with groove 21 degree of depth.
When this utility model uses, the bone screw of said structure is inserted in the human body, inserted in the bone screw by cutter head 50, the rotary screw withdrawing device is a may command bone screw approach axis.Can use the normal screws cutter when taking out bone screw, also can use screw withdrawing device with the bone screw structure matching, the normal screws cutter is got bone screw generation stripped thread, screw cap 20 breaks or broken nail if use, and uses supporting screw withdrawing device instead and is inserted into that rotary handle 30 can easily take out bone screw on the bone screw in groove 21 and the tongue portion 22.
Owing to increased the contact area of screw withdrawing device and bone screw during design, it is more even to make that spinning force distributes, thereby the area of putting forth effort that using the screw withdrawing device to get nail simultaneously can significantly increase screw cap makes the patient more laborsaving, effectively shorten operating time, alleviate patient's misery, thereby can take out screw easily.
In sum, anti-stripped thread bone screw of this utility model and screw withdrawing device are by offering groove 21 at screw cap 20, and all outwards protrude the tongue portion 22 that is provided with along groove 21 peripheral ends, cutter head 50 structures of attachment screw withdrawing device, increase the contact area of cutter head 50 and screw cap 20, can easily take out bone screw, solve bone screw and when screwing out, skidded easily and be difficult for the problem of taking out.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to this utility model scope.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from this utility model design, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with claims.
Claims (5)
1. anti-stripped thread bone screw, it is characterized in that: comprise shank of screw (10) and screw cap (20), has tapping screw thread portion (11) on the described shank of screw (10), described screw cap (20) offers font groove (21), and the tongue portion (22) that is provided with is all outwards protruded in described groove (21) end.
2. anti-stripped thread bone screw according to claim 1 is characterized in that: described groove (21) is " one " font or " ten " glyph construction.
3. anti-stripped thread bone screw according to claim 2 is characterized in that: described groove (21) is " Z " font or " Swastika " glyph construction with tongue portion (22) combined shaped.
4. screw withdrawing device that is used for the described anti-stripped thread bone screw of claim 1 ~ 3, it is characterized in that: comprise handle (30), connecting rod (40) and cutter head (50), described handle (30) is arranged on described connecting rod (40) one ends, described cutter head (50) protrudes out and is fixed on described connecting rod (40) other end, and described cutter head (50) is the Z that matches with groove (21) and tongue portion (22) " font Huo “ Swastika " glyph construction.
5. anti-stripped thread bone screw according to claim 1 is characterized in that: described cutter head (50) height mates with groove (21) degree of depth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320106331 CN203089347U (en) | 2013-03-08 | 2013-03-08 | Anti-wire-sliding bone-screw and screw removing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320106331 CN203089347U (en) | 2013-03-08 | 2013-03-08 | Anti-wire-sliding bone-screw and screw removing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203089347U true CN203089347U (en) | 2013-07-31 |
Family
ID=48840800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320106331 Expired - Fee Related CN203089347U (en) | 2013-03-08 | 2013-03-08 | Anti-wire-sliding bone-screw and screw removing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203089347U (en) |
-
2013
- 2013-03-08 CN CN 201320106331 patent/CN203089347U/en not_active Expired - Fee Related
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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: 20130731 Termination date: 20180308 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |