CN213190010U - Expansion hollow self-tapping bone nail - Google Patents

Abstract

The utility model relates to an inflation formula cavity self tapping bone nail uses in orthopedic medical instrument's technical field, and it includes guiding tube and plug, and the one end of guiding tube is equipped with the inflation piece that a plurality of circumference distribute, and the one end that the guiding tube was kept away from to each inflation piece is equipped with the screw thread post, and the inscribed circle diameter of each inflation piece is less than the plug diameter. The utility model discloses have the not hard up effect of reduction bone nail.

Description

Expansion hollow self-tapping bone nail

Technical Field

The utility model belongs to the technical field of orthopedics medical instrument's technique and specifically relates to an inflation formula cavity self tapping bone nail is related to.

Background

The bone nail is a commonly used bone fixing device in orthopedic surgery, and can fix devices such as a connecting plate, a fixing plate and the like on bones, so that the bone nail is convenient for treating orthopedic diseases such as fracture, bone deformation and the like.

Notice No. is CN 204318888U's chinese patent discloses a medical bone nail, including the bone nail body that is helicitic texture, bone nail body upper end is equipped with the head of a nail, the inside polygonal dismantlement groove that is equipped with certain degree of depth of head of a nail, dismantle the inslot be equipped with rather than the complex disassembly bar, the disassembly bar upper end is equipped with dismantlement cap, be equipped with a plurality of through-hole on the bone nail body, and follow the diameter of through-hole down and reduce gradually earlier after, the lower extreme both sides of bone nail body are equipped with broken sword.

The above prior art solutions have the following drawbacks: after the bone nail is connected, the bone nail is easy to loosen in bone tissues along with the movement of the bone, so that secondary trauma is caused.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing an inflation formula cavity self tapping bone nail, it has the not hard up effect of reduction bone nail.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: the utility model provides an inflation formula cavity self tapping bone nail, includes guiding tube and plug, the one end of guiding tube is equipped with the inflation piece that a plurality of circumference distribute, each the one end that the guiding tube was kept away from to the inflation piece is equipped with the screw thread post, each the inscribed circle diameter of inflation piece is less than the plug diameter.

By adopting the technical scheme, the guide tube is screwed to drive the threaded column to rotate, the core rod is inserted from the guide tube after the bone nail enters the bone, and the inner wall of the expansion sheet is extruded by the core rod, so that the expansion sheet protrudes outwards to be tightly propped against bone tissues, the possibility of reverse loosening of the bone nail is reduced, and the bone of a human body is protected; the core rod increases the overall strength of the bone nail and improves the stability of the bone nail under the action of external force.

The present invention may be further configured in a preferred embodiment as: one end of the core rod is provided with a first conical surface, and the inner wall of each expansion piece is provided with a second conical surface matched with the first conical surface.

By adopting the technical scheme, the second conical surface plays a role in guiding the first conical surface, the smoothness of the insertion of the core rod is increased, the resistance of the core rod during insertion is favorably reduced, and thus the compression on bones is relieved.

The present invention may be further configured in a preferred embodiment as: the outer wall of the end, far away from the first conical surface, of the core rod is provided with an external thread, and the end, far away from the expansion sheet, of the guide tube is provided with an internal thread.

Through adopting above-mentioned technical scheme, make the operator can twist the plug through the cooperation of external screw thread and internal thread and order about the plug and advance or retreat in the guide tube, labour saving and time saving is convenient for control the plug to the extrusion force of inflation piece.

The present invention may be further configured in a preferred embodiment as: one end of the core rod, which is far away from the first conical surface, is provided with inner hexagonal grooves which are coaxially distributed.

By adopting the technical scheme, an operator can insert the special hexagonal screw for orthopedics into the inner hexagonal groove, and the hexagonal screw is rotated to drive the core rod to rotate, so that the operation is convenient and fast.

The present invention may be further configured in a preferred embodiment as: and one end of the guide tube, which is far away from the expansion sheet, is provided with a coaxially distributed limit convex ring.

Through adopting above-mentioned technical scheme, spacing bulge loop has played the effect of restriction guiding tube screw in degree of depth, guarantees the position accuracy of bone nail.

The present invention may be further configured in a preferred embodiment as: the inner wall of the limit convex ring is provided with a quincuncial groove.

Through adopting above-mentioned technical scheme, the plum blossom groove shape does benefit to the even area of contact who increases it and correspond the screwdriver, reduces the condition that the screwdriver appears skidding when twisting the guide tube.

The present invention may be further configured in a preferred embodiment as: the end part of the threaded column is provided with a chip guide groove and a cutting edge.

Through adopting above-mentioned technical scheme, the screw thread post is at rotatory in-process, and the cutting edge cuts the ascending tissue of direction of advance, has guaranteed that the screw thread post is attacked smoothly, has alleviateed the direct oppression to the bone, has also reduced the too big and stuck possibility of resistance that the screw thread post received simultaneously.

The present invention may be further configured in a preferred embodiment as: and a through groove is formed in the threaded column.

Through adopting above-mentioned technical scheme, lead to the groove and reduced the influence that bone nail overall quality brought to the bone, also made things convenient for the chip removal that the cutting edge made at the cutting simultaneously.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the possibility of loosening of the bone nail after being screwed into the bone is reduced; the core rod increases the overall strength of the bone nail;

2. the smoothness of the core rod extrusion expansion sheet is improved by the matching of the first conical surface and the second conical surface; the limiting convex ring plays a role in limiting the screwing depth of the guide pipe; the cutting edge ensures smooth precession of the threaded stud.

Drawings

Fig. 1 is a schematic structural diagram of the present embodiment.

Fig. 2 is a schematic structural view of the mandrel bar and the guide tube according to the present embodiment.

In the figure, 1, guide tube; 11. an intumescent sheet; 111. a second tapered surface; 12. a threaded post; 121. a chip guide groove; 122. a cutting edge; 123. a through groove; 13. an internal thread; 14. a limit convex ring; 141. a plum blossom groove; 2. a core rod; 21. a first conical surface; 22. an external thread; 23. an inner hexagonal groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, for the utility model discloses an expansion type hollow self-tapping bone nail, which comprises a guide tube 1 and a core rod 2, one end of the guide tube 1 is provided with a limit convex ring 14, the other end is provided with a plurality of expansion pieces 11 which are distributed along the axial direction of the guide tube at equal intervals, the outer wall of each expansion piece 11 is arc-shaped and forms the same diameter of the outer circle as that of the guide tube 1, and the diameter of the inner tangent circle of each expansion piece 11 is smaller than the inner diameter of the guide tube 1; one end, far away from the guide tube 1, of each expansion piece 11 is connected with a threaded column 12, a through groove 123 penetrating through the end portion of the threaded column 12 is formed in the threaded column 12, the end portion of the threaded column 12 is provided with three chip guide grooves 121 and three cutting edges 122, the end portion of the threaded column 12 is divided into three sections, the cutting edges 122 are arranged on the edges, divided into the sections by the chip guide grooves 121, of the threaded column 12, and the limiting convex ring 14, the guide tube 1, the expansion pieces 11 and the threaded column 12 are integrally formed and are all distributed coaxially.

As shown in fig. 2, the outer diameter of the limit bulge loop 14 is larger than that of the guide tube 1, the surface of the limit bulge loop is in arc transition, which is beneficial to reducing resistance and hard obstruction, and the inner wall of the limit bulge loop 14 is provided with a quincunx groove 141, so that an operator can conveniently insert and screw the guide tube 1 by using a corresponding quincunx screwdriver, and the slippage is reduced.

As shown in fig. 2, an internal thread 13 is provided in one end of the guiding tube 1 close to the limit convex ring 14, the core rod 2 is inserted into the guiding tube 1, an internal hexagonal groove 23 is provided on an end face of one end of the core rod 2, the internal hexagonal groove is coaxially distributed with the end face of the one end of the core rod 2, a first conical surface 21 is provided on the other end of the core rod 2, an external thread 22 meshed with the internal thread 13 is provided on an outer wall of one end of the core rod 2 provided with the internal hexagonal groove 23, the length of the external thread 22 is smaller than that of the internal thread 13, a second conical surface 111 matched with the first conical surface 21 is provided on an inner wall of each expansion piece 11, and a vertical.

The implementation principle of the embodiment is as follows: inserting a quincunx screwdriver into the quincunx groove 141, screwing the guide tube 1 to rotate, drilling a hole on a bone by the rotating cutting edge 122, and discharging bone chips from the chip guide groove 121 to prevent the threaded column 12 from being blocked; after the threaded column 12 is screwed into the bone to a specified depth, the core rod 2 is inserted into the guide tube 1, the medical hexagon screw is inserted into the inner hexagon groove 23, the hexagon screw is screwed to drive the core rod 2 to rotate, so that the core rod 2 advances, the first conical surface 21 is driven to extrude the second conical surface 111, the outward protrusion of the expansion sheet 11 is tightly abutted against the internal tissue of the bone, the later-stage tissue and the expansion sheet 11 grow together, and finally the hexagon screw is withdrawn, so that the bone expansion device is simple and convenient.

The stretching resistance of the bone nail is increased through the abutting force of the expansion sheet 11 and tissues in the bone, and the self-locking of the bone nail is realized, so that the possibility of reverse loosening of the bone nail is reduced, the expansion sheet 11 and the threaded column 12 are mutually independent, the strength and the self-tapping effect of the threaded column 12 are ensured, and the possibility of deformation of the threaded column 12 is reduced; in addition, after the bone nail is driven into the bone, the core rod 2 is retained in the guide tube 1, so that the overall strength of the bone nail is increased, the appearance of the bone nail is stable under external load, and the service life and the reliability of the bone nail are improved.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides an inflation formula cavity self tapping bone nail which characterized in that: including guiding tube (1) and plug (2), the one end of guiding tube (1) is equipped with expansion piece (11) that a plurality of circumference distribute, each the one end that guiding tube (1) were kept away from in expansion piece (11) is equipped with screw thread post (12), each the inscribed circle diameter of expansion piece (11) is less than plug (2) diameter.

2. The expanding hollow self-tapping bone screw according to claim 1, characterized in that: one end of the core rod (2) is provided with a first conical surface (21), and the inner wall of each expansion sheet (11) is provided with a second conical surface (111) matched with the first conical surface (21).

3. The expanding hollow self-tapping bone screw according to claim 1 or 2, characterized in that: the outer wall of one end, far away from the first conical surface (21), of the core rod (2) is provided with an external thread (22), and one end, far away from the expansion sheet (11), of the guide pipe (1) is provided with an internal thread (13).

4. The expanding hollow self-tapping bone screw according to claim 3, characterized in that: one end of the core rod (2) far away from the first conical surface (21) is provided with inner hexagonal grooves (23) which are coaxially distributed.

5. The expanding hollow self-tapping bone screw according to claim 1, characterized in that: and one end of the guide tube (1) far away from the expansion sheet (11) is provided with a coaxially distributed limit convex ring (14).

6. The expanding hollow self-tapping bone screw according to claim 5, characterized in that: the inner wall of the limit convex ring (14) is provided with a plum blossom groove (141).

7. The expanding hollow self-tapping bone screw according to claim 1, characterized in that: the end part of the threaded column (12) is provided with a chip guide groove (121) and a cutting edge (122).

8. The expanding hollow self-tapping bone screw according to claim 1 or 7, characterized in that: a through groove (123) is formed in the threaded column (12) in a penetrating mode.

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