Telescopic intramedullary nail

Abstract

The utility model relates to a medical instrument, in particular to a telescopic intramedullary nail, a nail body comprises a plurality of nail tubes which are sequentially butted from top to bottom, the lower end of an upper nail tube and the upper end of a lower nail tube which are adjacent are connected in an inserted mode, and a kidney-shaped hole which is transversely formed along the nail body and penetrates through the inserted connection position is formed in the inserted connection position of the upper nail tube and the lower nail tube. A bolt used for limiting mutual rotation between the upper-section nail pipe and the lower-section nail pipe is arranged in the kidney-shaped hole, a distance exists between a bolt body of the bolt and the upper hole wall and the lower hole wall of the kidney-shaped hole, and the bolt is used for enabling the upper-section nail pipe and the lower-section nail pipe to move up and down in a telescopic mode along the linear section of the kidney-shaped hole. A two-section or multi-section type telescopic structure is adopted in consideration of the fact that bones are living tissues, and meanwhile the intramedullary nail is limited to only stretch out and draw back up and down and cannot twist left and right, namely rotate; the treatment requirement is met, the fracture recovery speed is increased, and the problem that a patient pains in the recovery period due to the fact that the length of an existing intramedullary nail is fixed is solved or reduced.

Description

Technical Field

[0001] This utility model relates to medical devices, and in particular to a retractable intramedullary nail. Background Technology

[0002] In fracture treatment, intramedullary nailing is often used to aid in fracture recovery. However, existing intramedullary nails have a fixed length, with both ends fixed at the fracture site, leaving no room for movement. Since bone is living tissue that regenerates, repairs, remodels, and grows, it is incorrect to use existing intramedullary nails to firmly fix the fracture site. During bone repair or growth, the bones will compress each other, causing discomfort to the patient. In severe cases, painkillers may be needed for relief. This type of intramedullary nail is also not conducive to fracture recovery. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the problem that the length fixation of existing intramedullary nails is not conducive to fracture recovery, a retractable intramedullary nail is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a retractable intramedullary nail, including a nail body, characterized in that: the nail body includes multiple nail tubes connected vertically, the lower end of an adjacent upper nail tube is inserted into the upper end of a lower nail tube, the insertion connection between the upper and lower nail tubes has a waist hole that is opened laterally along the nail body and passes through the insertion connection, a bolt is provided in the waist hole for limiting the mutual rotation between the upper and lower nail tubes, and there is a distance between the bolt body and the upper and lower hole walls of the waist hole, so as to allow the upper and lower nail tubes to retract and move vertically along the straight section of the waist hole.

[0005] Furthermore, the distance between the bolt body and the upper and lower walls of the waist hole is 0.1mm to 1mm.

[0006] Furthermore, the adjacent upper and lower nail tubes are connected by inserting the upper end of the lower nail tube into the lower end of the upper nail tube.

[0007] Alternatively, adjacent upper and lower nail tubes can be connected by inserting the lower end of the upper nail tube into the interior of the upper end of the lower nail tube.

[0008] Furthermore, a spring is provided between the insertion connection of the adjacent upper and lower nail tubes to push the adjacent upper and lower nail tubes to extend and move up and down. The springs are distributed vertically with the waist holes at the insertion connection.

[0009] Furthermore, the adjacent upper and lower nail tubes are connected by inserting the upper end of the lower nail tube into the lower end of the upper nail tube. Both the lower end of the upper nail tube and the upper end of the lower nail tube are countersunk holes. The lower end of the spring is set in the countersunk hole at the upper end of the lower nail tube and abuts against the stepped surface of the countersunk hole. The upper end of the spring acts on the stepped surface of the countersunk hole at the lower end of the upper nail tube. The spring is located above the waist hole.

[0010] Alternatively, adjacent upper and lower nail tubes can be connected by inserting the lower end of the upper nail tube into the upper end of the lower nail tube. Both the lower end of the upper nail tube and the upper end of the lower nail tube are countersunk holes. The upper end of the spring is set in the countersunk hole at the lower end of the upper nail tube and abuts against the stepped surface of the countersunk hole. The lower end of the spring acts on the stepped surface of the countersunk hole at the upper end of the lower nail tube. The spring is located below the waist hole.

[0011] The beneficial effects of this utility model are: This utility model provides a retractable intramedullary nail with a simple structure. Considering that bone is a living tissue, it adopts a two- or multi-segment retractable structure, while restricting the intramedullary nail to only extend and retract vertically, and not to twist or rotate horizontally; it meets the treatment needs, improves the fracture recovery speed, and solves or reduces the pain problem that patients experience during the recovery period due to the fixed length of existing intramedullary nails. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 Sectional view at point AA;

[0015] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0016] Figure 4 This is a cross-sectional view of the connection between the upper and lower nail tubes in Embodiment 2 of this utility model.

[0017] In the diagram: 1. Upper section nail tube, 2. Lower section nail tube, 3. Waist hole, 4. Bolt, 5. Spring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Example 1, as Figures 1 to 3 The diagram illustrates a retractable intramedullary nail, comprising a nail body and multiple nail tubes, typically two to three sections, joined sequentially. The diagram shows the upper and lower sections. The upper nail tube 1 and the lower nail tube 2 are connected by inserting the upper end of the lower nail tube 2 into the lower end of the upper nail tube 1. After connection, the joint between the upper and lower nail tubes is flush, forming a flat section without any protrusions. The joint between the upper and lower nail tubes has a transverse through-hole 3 extending through the nail body. This through-hole 3 is a common type of through-hole, comprising arc-shaped sections at both ends and... In the middle straight section, the lumbar hole 3 is equipped with a bolt 4 for limiting the mutual rotation between the upper section nail tube 1 and the lower section nail tube 2. The bolt 4 can be a bone screw, which is directly fixed to the bone, or it can be fixed by threading a nut at the end of the bolt 4. The bolt 4 can also be replaced with other components such as pins or dowels. There is a distance between the bolt body and the upper and lower hole walls (arc section) of the lumbar hole 3. Usually, this distance is between 0.1mm and 1mm. The appropriate size is selected according to the patient's age and the affected area. The upper section nail tube 1 and the lower section nail tube 2 can move up and down along the straight section of the lumbar hole 3.

[0020] The upper nail tube 1 and the lower nail tube 2 extend vertically as the bone grows to prevent the bones at the fracture site from squeezing each other and causing pain to the patient. When the gap at the fracture site is too large, the fracture site will automatically move closer together under the influence of daily rehabilitation and gravity, that is, the upper nail tube 1 and the lower nail tube 2 will move closer together.

[0021] A spring 5 is also provided between the insertion connection of the upper nail tube 1 and the lower nail tube 2. The spring 5 is used to push the upper nail tube 1 and the lower nail tube 2 to extend and move up and down. The spring 5 and the waist hole 3 at the insertion connection are distributed vertically.

[0022] The lower end of the upper section nail tube 1 and the upper end of the lower section nail tube 2 are both countersunk holes. The lower end of the spring 5 is set in the countersunk hole at the upper end of the lower section nail tube 2 and abuts against the stepped surface of the countersunk hole. The upper end of the spring 5 acts on the stepped surface of the countersunk hole at the lower end of the upper section nail tube 1. The spring 5 is located above the waist hole 3.

[0023] Example 2 is basically the same as Example 1, except that: Figure 4As shown, the upper section nail tube 1 and the lower section nail tube 2 are connected by inserting the lower end of the upper section nail tube 1 into the interior of the upper end of the lower section nail tube 2.

[0024] The lower end of the upper section nail tube 1 and the upper end of the lower section nail tube 2 are both countersunk holes. The upper end of the spring 5 is set in the countersunk hole at the lower end of the upper section nail tube 1 and abuts against the stepped surface of the countersunk hole. The lower end of the spring 5 acts on the stepped surface of the countersunk hole at the upper end of the lower section nail tube 1. The spring 5 is located below the waist hole 3.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A telescopic intramedullary nail comprising a nail body, characterized in that: The nail body comprises a plurality of nail tubes which are connected in sequence from top to bottom, the lower end of the upper nail tube is connected with the upper end of the lower nail tube, the connecting position of the upper nail tube and the lower nail tube is provided with a waist hole which is opened along the lateral direction of the nail body and penetrates through the connecting position, a bolt is arranged in the waist hole for limiting the rotation between the upper nail tube and the lower nail tube, the distance between the bolt body and the upper and lower hole walls of the waist hole is used for allowing the upper nail tube and the lower nail tube to move up and down along the straight line of the waist hole.

2. An intramedullary nailing device according to claim 1, wherein: The distance between the bolt body and the upper and lower hole walls of the waist hole is 0.1mm-1mm.

3. The telescoping intramedullary nail of claim 1, wherein: The upper nail tube and the lower nail tube are connected by the way that the upper end of the lower nail tube extends into the inside of the lower end of the upper nail tube. Or the upper nail tube and the lower nail tube are connected by the way that the lower end of the upper nail tube extends into the inside of the upper end of the lower nail tube.

4. The telescoping intramedullary nail of claim 1, wherein: A spring is arranged between the connecting positions of the upper nail tube and the lower nail tube for pushing the upper nail tube and the lower nail tube to move up and down, the spring is distributed above and below the waist hole of the connecting position.

5. An intramedullary nailing device according to claim 4, wherein: The upper nail tube and the lower nail tube are connected by the way that the upper end of the lower nail tube extends into the inside of the lower end of the upper nail tube, the lower end of the upper nail tube and the upper end of the lower nail tube are both counterbores, the lower end of the spring is arranged in the counterbore of the upper end of the lower nail tube and abuts against the stepped surface of the counterbore, the upper end of the spring abuts against the stepped surface of the counterbore of the lower end of the upper nail tube, and the spring is arranged above the waist hole. Or the upper nail tube and the lower nail tube are connected by the way that the lower end of the upper nail tube extends into the inside of the upper end of the lower nail tube, the lower end of the upper nail tube and the upper end of the lower nail tube are both counterbores, the upper end of the spring is arranged in the counterbore of the lower end of the upper nail tube and abuts against the stepped surface of the counterbore, the lower end of the spring abuts against the stepped surface of the counterbore of the upper end of the lower nail tube, and the spring is arranged below the waist hole. ​ ​

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