CN215018761U - Intramedullary nail with broken nail extraction structure - Google Patents
Intramedullary nail with broken nail extraction structure Download PDFInfo
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- CN215018761U CN215018761U CN202121533678.8U CN202121533678U CN215018761U CN 215018761 U CN215018761 U CN 215018761U CN 202121533678 U CN202121533678 U CN 202121533678U CN 215018761 U CN215018761 U CN 215018761U
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- intramedullary nail
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Abstract
The utility model relates to an intramedullary nail with disconnected nail takes out structure, including the intramedullary nail body, flexible plug has in the axial direction hole of intramedullary nail body, the lower extreme of flexible plug has the external screw thread, the upper end of flexible plug has draws the hole, the upper end of flexible plug is located the below in near-end lock nail hole, the distal end of the axial direction hole of intramedullary nail body has little diameter section, the upper end of little diameter section is located the top in distal end lock nail hole, has the internal thread in the upper end of little diameter section, the lower extreme of flexible plug and the upper end threaded connection of little diameter section. The beneficial effects are that: the outer wall of the flexible core rod and the inner wall of the intramedullary nail are layered, the flexible core rod cannot be broken due to the fracture of the intramedullary nail, after the upper half-section intramedullary nail is taken out, the upper end of the flexible core rod is close to a nail inlet of the intramedullary nail, the upper end of the flexible core rod can be easily hooked to a drawing hole of the flexible core rod through a drawing hook, the lower half-section broken nail is extracted, the operation is more convenient and quicker, and the operation time is saved.
Description
Technical Field
The utility model relates to an intramedullary nail with a broken nail extraction structure.
Background
Intramedullary nail broken nail extraction is a very troublesome thing in the industry, and although the occurrence probability is not high, the intramedullary nail broken nail extraction is a great clinical project as long as the occurrence probability is high.
As shown in fig. 5, the clinical intramedullary nail fracture occurs substantially at the fracture line site, i.e., in the middle of the intramedullary nail. The upper half intramedullary nail is easy to be taken out, and the lower half intramedullary nail is very difficult to be taken out.
Chinese patent document CN105342696A discloses a slip buckle extractor for broken intramedullary nail, which comprises two parts, which are: the end part of the first guide wire is of a claw structure or a ball head structure, the first guide wire is used for stretching into the broken nail position of the intramedullary nail to hook the end part of the broken nail or clamping the end part into a threaded hole of the broken nail, then the second guide wire is inserted, the second guide wire is used for tensioning the first guide wire to enable the claw or the ball head to be stably connected with the broken nail, and finally the broken nail is pulled out by using the first guide wire and the second guide wire.
The disadvantages of this prior art are: the lower half section of broken nail is far away from the nail feeding point of the intramedullary nail, and the guide wire of the extractor is difficult to accurately insert into the inner cavity of the broken nail, so that the operation is troublesome, and the time for taking the broken nail is too long.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the existing intramedullary nail broken nail extraction technology is still troublesome to operate and consumes too long time.
The utility model provides a technical scheme that its technical problem adopted is: an intramedullary nail with a broken nail extraction structure comprises an intramedullary nail body, wherein an axial central hole is arranged in the intramedullary nail body, a distal locking nail hole is arranged at the distal end of the intramedullary nail body, a proximal locking nail hole is arranged at the proximal end of the intramedullary nail body, a broken nail taking-out structure is arranged in an axial central hole of the intramedullary nail body, the broken nail taking-out structure comprises a flexible core rod, the lower end of the flexible core rod is provided with an external thread, the upper end of the flexible core rod is provided with a drawing hole, the upper end of the flexible core rod is positioned below the lowest near-end locking nail hole, the far end of the axial central hole of the intramedullary nail body is provided with a small-diameter section, the upper end of the small-diameter section is positioned above the highest far-end locking nail hole, the upper end of the small-diameter section is provided with an internal thread which is in threaded fit with the external thread at the lower end of the flexible core rod, and the lower end of the flexible core rod is in threaded connection with the upper end of the small-diameter section of the axial center hole through the external thread and the internal thread.
In order to facilitate the installation of the flexible core rod, the upper end of the flexible core rod is further limited to be a flat head for rotating the flexible core rod through a tool.
Further, the distance between the upper end of the flexible core rod and the lower edge of the lowest near-end locking nail hole is smaller than the screwing depth of the flexible core rod into the small-diameter section, and the flexible core rod is prevented from being screwed out of the upper end of the small-diameter section of the axial center hole.
Further limiting, the axial center hole is divided into an upper section and a lower section, wherein the upper section is a large-diameter section, and the lower section is a small-diameter section.
The utility model has the advantages that: the outer wall of the flexible core rod and the inner wall of the intramedullary nail are layered, the flexible core rod cannot be broken due to the fracture of the intramedullary nail, the upper end of the core rod is close to a nail inlet of the intramedullary nail in the upper half-section of the intramedullary nail, the upper end of the core rod can be easily hooked to a drawing hole of the flexible core rod through a drawing hook, the lower half-section broken nail is extracted, the operation is more convenient and faster, and the operation time is saved.
Drawings
The present invention will be further explained with reference to the drawings and examples;
FIG. 1 is a schematic view of the intramedullary nail of the present invention;
fig. 2 is a schematic structural view of the flexible core rod in a front view;
fig. 3 is a schematic structural view of the flexible core rod of the present invention in a side view;
fig. 4 is a schematic structural view of the installation tool of the present invention;
FIG. 5 is a schematic view of a prior art intramedullary nail showing nail breakage;
in the figure, 1, an intramedullary nail body, 2, an axial central hole, 2-1, a small diameter section, 2-2, a large diameter section, 3, a distal locking nail hole, 4, a proximal locking nail hole, 5, a flexible core rod, 6, an external thread, 7, a drawing hole, 8, an internal thread, 9, a flat head, 10, an installation tool, 10-1, a handle, 10-2, a groove, 10-3, a clamping head and 11, a bone nail.
Detailed Description
As shown in figures 1 to 3, an intramedullary nail with a broken nail extraction structure comprises an intramedullary nail body 1, wherein an axial central hole 2 is arranged in the intramedullary nail body 1, a distal locking hole 3 is arranged at the distal end of the intramedullary nail body 1, a proximal locking hole 4 is arranged at the proximal end of the intramedullary nail body 1, a broken nail extraction structure is arranged in the axial central hole 2 of the intramedullary nail body 1, the broken nail extraction structure comprises a flexible core rod 5, an external thread 6 is arranged at the lower end of the flexible core rod 5, a drawing hole 7 is arranged at the upper end of the flexible core rod 5, the upper end of the flexible core rod 5 is arranged below the lowest proximal locking hole 4, the distal end of the axial central hole 2 of the intramedullary nail body 1 is provided with a small-diameter section 2-1, the upper end of the small-diameter section 2-1 is arranged above the highest distal locking hole 3, an internal thread 8 in threaded fit with the external thread 6 at the lower end of the flexible core rod 5 is arranged at the upper end of the small-diameter section 2-1, the flexible core rod 5 is inserted into the axial center hole 2 from the near end of the intramedullary nail body 1, and the flexible core rod 5 is rotated to lead the lower end of the flexible core rod 5 to be screwed into the upper end of the small diameter section 2-1 of the axial center hole 2, thus realizing threaded connection.
The upper end of the flexible core rod 5 is a flat head 9 for rotating the flexible core rod 5 by a tool.
The distance between the upper end of the flexible core rod 5 and the lower edge of the last near-end locking nail hole 4 is smaller than the screwing depth of the flexible core rod 5 into the small-diameter section 2-1, and the flexible core rod 5 is prevented from being screwed out of the upper end of the small-diameter section 2-1 of the axial center hole 2.
The axial center hole 2 is divided into an upper section and a lower section, wherein the upper section is a large-diameter section 2-2, and the lower section is a small-diameter section 2-1.
The material of the flexible core rod 5 may be a titanium alloy.
The using method comprises the following steps:
when the intramedullary nail is implanted, the flexible core rod 5 is not installed in the intramedullary nail, and the intramedullary nail is inserted into a bone cavity from a nail inlet on a bone along a guide wire through the central axis hole 2, which is the same as the prior art. After the intramedullary nail is in place, the guide wire is pulled out, and then the flexible core rod 5 is installed in the central axial hole 2 of the intramedullary nail.
The installation process is as follows: the upper end of the flexible core rod 5 is mounted on a mounting tool 10, the mounting tool 10 being shown in figure 4, the upper end of the installation tool 10 is provided with a handle 10-1, the lower end is provided with a slot 10-2, a chuck 10-3 is arranged at the inner side of the open slot 10-2, a flat head 9 of the flexible core rod 5 is clamped into the open slot 10-2 at the lower end of the installation tool 10, the chuck 10-3 is clamped into the drawing hole 7, so that the upper end of the flexible core rod 5 and the lower end of the installation tool 10 form a temporary connection relationship, the flexible core rod 5 may be inserted into the axial center hole 2 by the installation tool 10, and after insertion into place the flexible core rod 5 is rotated, after the lower end of the flexible core rod 5 is completely screwed into the upper end of the small-diameter section 2-1, the installation tool 10 is slightly pulled outwards with force, the lower end of the installation tool 10 can be separated from the upper end of the flexible core rod 5, and the installation of the flexible core rod 5 is completed. After the installation of the flexible core rod 5 is finished, according to the existing operation process, the bone nails 11 are respectively screwed into the proximal locking nail hole 4 and the distal locking nail hole 3 of the intramedullary nail, thereby finishing the intramedullary nail internal fixation operation.
When the intramedullary nail needs to be taken out due to broken nail, the broken nail at the upper half section can be firstly pulled out, and then the pulling hole 7 is hooked by the nail pulling hook, and the broken nail at the lower half section is pulled out. Certainly, the upper half section of broken nail and the lower half section of broken nail can be alternately pulled outwards, and the nail pulling hook is guided by the central axis hole 2 of the upper half section of broken nail, so that the nail pulling hook can be hooked on the pulling hole 7 more easily.
Claims (4)
1. The utility model provides an intramedullary nail with disconnected nail takes out structure, includes intramedullary nail body (1), has axial centre bore (2) in intramedullary nail body (1), and the distal end of intramedullary nail body (1) has distal end lock nail hole (3), and the near-end of intramedullary nail body (1) has near-end lock nail hole (4), characterized by: a broken nail taking-out structure is arranged in an axial center hole (2) of the intramedullary nail body (1), the broken nail taking-out structure comprises a flexible core rod (5), the lower end of the flexible core rod (5) is provided with an external thread (6), the upper end of the flexible core rod (5) is provided with a drawing hole (7), the upper end of the flexible core rod (5) is positioned below the bottommost near-end locking nail hole (4), the far end of the axial center hole (2) of the intramedullary nail body (1) is provided with a small-diameter section (2-1), the upper end of the small-diameter section (2-1) is positioned above the topmost far-end locking nail hole (3), the upper end of the small-diameter section (2-1) is provided with an internal thread (8) in threaded fit with the external thread (6) at the lower end of the flexible core rod (5), and the lower end of the flexible core rod (5) is in threaded connection with the upper end of the small-diameter section (2-1) of the axial center hole (2) through the external thread (6) and the internal thread (8).
2. The intramedullary nail having a broken nail extraction structure of claim 1, wherein: the upper end of the flexible core rod (5) is a flat head (9) which is used for rotating the flexible core rod (5) through a tool.
3. The intramedullary nail having a broken nail extraction structure of claim 1, wherein: the distance between the upper end of the flexible core rod (5) and the lower edge of the last near-end locking nail hole (4) is smaller than the depth of the flexible core rod (5) screwed into the small-diameter section (2-1) and is used for preventing the flexible core rod (5) from being screwed out of the upper end of the small-diameter section (2-1) of the axial center hole (2).
4. The intramedullary nail having a broken nail extraction structure of claim 1, wherein: the axial center hole (2) is divided into an upper section and a lower section, wherein the upper section is a large-diameter section (2-2), and the lower section is a small-diameter section (2-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121533678.8U CN215018761U (en) | 2021-07-06 | 2021-07-06 | Intramedullary nail with broken nail extraction structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121533678.8U CN215018761U (en) | 2021-07-06 | 2021-07-06 | Intramedullary nail with broken nail extraction structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215018761U true CN215018761U (en) | 2021-12-07 |
Family
ID=79228025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121533678.8U Active CN215018761U (en) | 2021-07-06 | 2021-07-06 | Intramedullary nail with broken nail extraction structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215018761U (en) |
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2021
- 2021-07-06 CN CN202121533678.8U patent/CN215018761U/en active Active
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