CN203647462U - Intramedullary nail puller - Google Patents
Intramedullary nail puller Download PDFInfo
- Publication number
- CN203647462U CN203647462U CN201420009030.4U CN201420009030U CN203647462U CN 203647462 U CN203647462 U CN 203647462U CN 201420009030 U CN201420009030 U CN 201420009030U CN 203647462 U CN203647462 U CN 203647462U
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- China
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- bevel gear
- hollow screw
- screw
- driving bevel
- pin
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Abstract
The utility model relates to an intramedullary nail puller. The striking force of the existing puller is not easy to control and cannot be adjusted. The intramedullary nail puller comprises an expansion rod, a hollow screw and a cam striking device; the cam striking device comprises a rotating cam sleeve, a sliding cam sleeve, a spiral spring, a positioning sleeve, a small driving bevel gear and a handheld motor; the small driving bevel gear is fixed on the handheld motor; a rear end of the hollow screw is provided with a cylinder holding portion and a longitudinal sliding groove; the middle of the hollow screw is provided with adjusting external threads; the positioning sleeve sleeves the adjusting external threads; the rotating cam sleeve, the sliding cam sleeve and the spiral spring sequentially sleeve to the hollow screw which is arranged between the cylinder holding portion and the positioning sleeve; the rotating cam sleeve and the sliding cam sleeve are cylindrical cams; the rotating cam sleeve is fixedly connected with a large driving bevel gear; the small driving bevel gear and the large driving bevel gear are mutually meshed. The intramedullary nail puller has the advantages of being convenient to use and suitable for pulling of various intramedullary nails.
Description
Technical field
This utility model relates to a kind of intramedullary pin injection-drawing out device.
Background technology
On November 18th, 2009, Chinese invention patent disclosed, that publication number is CN101579255A disclosed one kind of multiple interlocking intramedullary nail extractors, it comprises expansion rod and hollow screw, hollow screw front end has external screw thread or annular tooth, and having many longitudinal joint-cuttings, hollow screw front end is divided into many lobes by above-mentioned longitudinal joint-cutting; Expansion rod front end form conical nose, expansion rod rear portion is provided with external screw thread, hollow screw rear end is provided with the female thread corresponding with expansion rod rear external thread, in hollow screw also with integrally formed handle.When use, hollow screw is stretched in the screwed hole of intramedullary pin nail tail, execute and change hands handle, the conical nose of expansion rod is strutted the front end of hollow screw, together with being closely pressed together on the screw thread of intramedullary pin nail tail, then utilize injection-drawing out device to extract intramedullary pin, this structure can be extracted the intramedullary pin of the different model of different manufacturers production.
But existing injection-drawing out device is all to utilize manually to impact handle, so as to extracting intramedullary pin, impacts strength control bad, easily damages the wounded's bone.
March 21 calendar year 2001, Chinese utility model patent disclosed, that publication number is CN2423872Y disclosed a kind of electromagnetic random control intramedullary nail beating puller, and this injection-drawing out device hitting dynamics is fixed, but cannot regulate.
Utility model content
The technical problems to be solved in the utility model is the above-mentioned defect that how to overcome prior art, provides a kind of dynamics intramedullary pin injection-drawing out device accurate, easy to adjust.
For solving the problems of the technologies described above, this intramedullary pin injection-drawing out device comprises expansion rod and hollow screw, and hollow screw front end has external screw thread or annular tooth, and has many longitudinal joint-cuttings, and hollow screw front end is divided into many lobes by above-mentioned longitudinal joint-cutting, expansion rod front end forms conical nose, expansion rod rear portion is provided with external screw thread, hollow screw rear end is provided with the female thread corresponding with expansion rod rear external thread, it is characterized in that: it also comprises cam percussion device, this cam percussion device comprises rotating cam cover, sliding cam cover, helical spring, positioning sleeve, little driving bevel gear and a handheld electrical machinery, its medium and small driving bevel gear is fixed on the output shaft of handheld electrical machinery, described hollow screw rear end is provided with a cylinder grip part, and have longitudinal chute, described hollow screw middle part is provided with adjusting external screw thread, described positioning sleeve is provided with corresponding adjusting internal thread hole, positioning sleeve utilizes this adjusting internal thread hole to be enclosed within on described adjusting external screw thread, described rotating cam cover, sliding cam cover, helical spring is enclosed within the hollow screw between cylinder grip part and positioning sleeve successively, described rotating cam cover, sliding cam cover is barrel cam, the two contact surface is cam surface, this cam surface comprises multistage rise, top dead centre, backhaul, lower dead center, wherein backhaul is vertical face section, rotating cam cover one side is against on cylinder grip part, can rotate around hollow screw, sliding cam puts and is provided with sliding pin, and this sliding pin stretches into described longitudinal chute, and described rotating cam cover is also fixedly connected with a large bevel gear that drives, and described little driving bevel gear is intermeshing with the large bevel gear that drives.
Need to extract the intramedullary pin in the wounded's body time, first lock screw on intramedullary pin is all removed, then hollow screw is stretched in the screwed hole of intramedullary pin nail tail, rotation expansion rod, the conical nose of expansion rod is strutted the front end of hollow screw, cored screw is linked together securely with intramedullary pin.
Then, start handheld electrical machinery, drive the large bevel gear that drives by little driving bevel gear, drive rotating cam cover, rotating cam cover pushes away sliding cam cover to helical spring direction, compression helical spring, cam turns over top dead centre, directly enter backhaul, sliding cam is enclosed within helical spring bounce-back, clashes into fast rotating cam cover, realization impacts, handheld electrical machinery constantly rotates, and constantly impacts, and extracts quickly and easily intramedullary pin.Need to regulate force de frappe time, regulate positioning sleeve, helical spring is pressed tightlyer, and force de frappe is larger,, helical spring is pressed more loosely, and force de frappe is less, by regulating positioning sleeve, can facilitate and accurately control force de frappe size.
As optimization, described expansion rod front end is also provided with an extension, and the external diameter of this extension is less than the centre bore of adapted intramedullary pin, and is furnished with the pin of adapted intramedullary pin near-end and determines the lock-screw that screw hole is relative, this lock-screw can be hidden into described pin completely and determine screw hole, and pushes against described extension.So design, expansion rod and intramedullary pin are fixing more firm.
As optimization, on described cylinder grip part, have a radial location hole, described little driving bevel gear small end is provided with alignment pin, and when alignment pin inserts described radial location hole, described little driving bevel gear is just intermeshing with the large bevel gear that drives.So design, when handheld electrical machinery drives, more stable.
This utility model intramedullary pin injection-drawing out device has advantage simple in structure, easy to use, and various intramedullary pins are applicable to choosing.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, this intramedullary pin injection-drawing out device is described further:
Fig. 1 is the structural representation of this intramedullary pin injection-drawing out device.
In figure: 1 is that expansion rod, 2 is that hollow screw, 3 is that longitudinal joint-cutting, 4 is that handle, 5 is that conical nose, 6 is that rotating cam cover, 7 is that sliding cam cover, 8 is that helical spring, 9 is that positioning sleeve, 10 is that little driving bevel gear, 11 is that handheld electrical machinery, 12 is that cylinder grip part, 13 is that longitudinal chute, 14 is that adjusting external screw thread, 15 is that sliding pin, 16 is that driving bevel gear, 17 is that extension, 18 is lock-screw greatly.
The specific embodiment
Embodiment one: as shown in Figure 1, this intramedullary pin injection-drawing out device comprises expansion rod 1 and hollow screw 2, and hollow screw 2 front ends have external screw thread or annular tooth, and have many longitudinal joint-cuttings 3, hollow screw 2 front ends are divided into many lobes by above-mentioned longitudinal joint-cutting 3, expansion rod 1 front end forms conical nose 5, expansion rod 1 rear portion is provided with external screw thread, hollow screw 2 rear ends are provided with the female thread corresponding with expansion rod 1 rear external thread, it is characterized in that: it also comprises cam percussion device, this cam percussion device comprises rotating cam cover 6, sliding cam cover 7, helical spring 8, positioning sleeve 9, little driving bevel gear 10 and a handheld electrical machinery 11, its medium and small driving bevel gear 10 is fixed on the output shaft of handheld electrical machinery 11, described hollow screw 2 rear ends are provided with a cylinder grip part 12, and have longitudinal chute 13, described hollow screw 2 middle parts are provided with and regulate external screw thread 14, described positioning sleeve 9 is provided with corresponding adjusting internal thread hole, positioning sleeve utilizes this adjusting internal thread hole to be enclosed within on described adjusting external screw thread 14, described rotating cam cover 6, sliding cam cover 7, helical spring 8 is enclosed within the hollow screw 2 between cylinder grip part 12 and positioning sleeve 9 successively, described rotating cam cover 6, sliding cam cover 7 is barrel cam, the two contact surface is cam surface, this cam surface comprises four sections of rises, top dead centre, backhaul, lower dead center, wherein backhaul is vertical face section, rotating cam cover 6 one sides are against on cylinder grip part 12, can rotate around hollow screw 2, sliding cam cover 7 is provided with sliding pin 15, and this sliding pin 15 stretches into described longitudinal chute 13, and described rotating cam cover 6 is also fixedly connected with a large bevel gear 16 that drives, and described little driving bevel gear 10 is intermeshing with the large bevel gear 16 that drives.
Described expansion rod 1 front end is also provided with an extension 17, the external diameter of this extension 17 is less than the centre bore of adapted intramedullary pin, and be furnished with the pin of adapted intramedullary pin near-end and determine the lock-screw 18 that screw hole is relative, this lock-screw 18 can be hidden into described pin completely and determine screw hole, and pushes against described extension 17.
On described cylinder grip part 12, have a radial location hole, described little driving bevel gear 10 small ends are provided with alignment pin, and when alignment pin inserts described radial location hole, described little driving bevel gear 10 is just intermeshing with the large bevel gear 16 that drives.
Claims (3)
1. an intramedullary pin injection-drawing out device, comprises expansion rod and hollow screw, and hollow screw front end has external screw thread or annular tooth, and has many longitudinal joint-cuttings, and hollow screw front end is divided into many lobes by above-mentioned longitudinal joint-cutting, expansion rod front end forms conical nose, expansion rod rear portion is provided with external screw thread, hollow screw rear end is provided with the female thread corresponding with expansion rod rear external thread, it is characterized in that: it also comprises cam percussion device, this cam percussion device comprises rotating cam cover, sliding cam cover, helical spring, positioning sleeve, little driving bevel gear and a handheld electrical machinery, its medium and small driving bevel gear is fixed on the output shaft of handheld electrical machinery, described hollow screw rear end is provided with a cylinder grip part, and have longitudinal chute, described hollow screw middle part is provided with adjusting external screw thread, described positioning sleeve is provided with corresponding adjusting internal thread hole, positioning sleeve utilizes this adjusting internal thread hole to be enclosed within on described adjusting external screw thread, described rotating cam cover, sliding cam cover, helical spring is enclosed within the hollow screw between cylinder grip part and positioning sleeve successively, described rotating cam cover, sliding cam cover is barrel cam, the two contact surface is cam surface, this cam surface comprises multistage rise, top dead centre, backhaul, lower dead center, wherein backhaul is vertical face section, rotating cam cover one side is against on cylinder grip part, can rotate around hollow screw, sliding cam puts and is provided with sliding pin, and this sliding pin stretches into described longitudinal chute, and described rotating cam cover is also fixedly connected with a large bevel gear that drives, and described little driving bevel gear is intermeshing with the large bevel gear that drives.
2. intramedullary pin injection-drawing out device as claimed in claim 1, it is characterized in that: described expansion rod front end is also provided with an extension, the external diameter of this extension is less than the centre bore of adapted intramedullary pin, and be furnished with the pin of adapted intramedullary pin near-end and determine the lock-screw that screw hole is relative, this lock-screw can be hidden into described pin completely and determine screw hole, and pushes against described extension.
3. intramedullary pin injection-drawing out device as claimed in claim 1, it is characterized in that: on described cylinder grip part, have a radial location hole, described little driving bevel gear small end is provided with alignment pin, and when alignment pin inserts described radial location hole, described little driving bevel gear is just intermeshing with the large bevel gear that drives.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420009030.4U CN203647462U (en) | 2014-01-07 | 2014-01-07 | Intramedullary nail puller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420009030.4U CN203647462U (en) | 2014-01-07 | 2014-01-07 | Intramedullary nail puller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203647462U true CN203647462U (en) | 2014-06-18 |
Family
ID=50913908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420009030.4U Expired - Fee Related CN203647462U (en) | 2014-01-07 | 2014-01-07 | Intramedullary nail puller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203647462U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109069277A (en) * | 2016-04-27 | 2018-12-21 | 德普伊爱尔兰无限公司 | impactor |
| CN109277963A (en) * | 2018-10-01 | 2019-01-29 | 昆山斯格威电子科技有限公司 | Quick-locking device |
-
2014
- 2014-01-07 CN CN201420009030.4U patent/CN203647462U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109069277A (en) * | 2016-04-27 | 2018-12-21 | 德普伊爱尔兰无限公司 | impactor |
| CN109277963A (en) * | 2018-10-01 | 2019-01-29 | 昆山斯格威电子科技有限公司 | Quick-locking device |
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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: 20140618 Termination date: 20150107 |
|
| EXPY | Termination of patent right or utility model |