Intramedullary nail far-end locking compression bar device

Abstract

The utility model discloses an intramedullary nail far-end locking pressing rod device. The device integrates a clamping block, a threaded lower pressing rod and a threaded sleeve. The clamping block is stably installed on the far-end aiming support, the lower portion of the clamping block is provided with a clamping groove for fixing the threaded sleeve, and the upper portion of the clamping block is provided with a guide groove for guiding the threaded pressing rod to be smoothly inserted into the threaded sleeve. The threaded sleeve is tightly assembled in the clamping groove of the clamping block, and the threaded pressing rod is in threaded connection with the threaded sleeve after passing through the clamping block guide groove. The threaded pressing rod can gradually extend out of the lower end of the threaded sleeve by rotating the threaded pressing rod. According to the intramedullary nail far-end locking pressing rod device, through the improved design, the problem of floating deformation of main nails of different specifications on a sagittal view is effectively solved, and the accuracy of placing a far-end locking screw into the main nail is remarkably improved. Clinical application research shows that the device can effectively shorten the operation time and improve the operation efficiency, and compared with an S2 intramedullary nail far-end locking system, the device has higher locking accuracy and operation convenience.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to a distal locking pressure bar device for intramedullary nails. Background Technology

[0002] In modern medicine, especially in orthopedic surgery, intramedullary nailing has become a crucial method for treating fractures. The locking of the distal interlocking nail is particularly critical in intramedullary nailing surgery. However, in actual surgical procedures, due to individual differences in patient anatomy and the surgeon's subjectivity in selecting the entry point, the main intramedullary nail often undergoes lateral bending deformation as it passes through the medullary cavity. This coronal and sagittal deformation of the main nail is the root cause of inaccurate distal locking in current mechanical aiming devices. Studies have shown that under standard operating conditions, coronal and rotational deformation of the distal intramedullary nail can be ignored in some cases, but controlling the displacement of the main nail in the sagittal plane is essential. Misalignment of the pressure bar positioning will directly lead to a loss of control over the distal end of the main nail, thus preventing the distal interlocking nail from accurately locking the main intramedullary nail. Currently, the traditional pressure bar technique uses a clamp to fix the pressure bar to the distal aiming device, controlling the upward deformation of the main nail in the sagittal plane through a fixed downward pressure. However, the downward pressure is determined by the clamp and is a fixed value. Since the actual deformation of master nails of different diameters and lengths within the medullary cavity varies, this fixed downward pressure cannot solve the problem of upward deformation of master nails of different specifications. Utility Model Content

[0003] This utility model aims to provide a distal locking lever device for intramedullary nails to solve the problem of sagittal displacement deformation of main nails of different specifications, improve the accuracy of distal locking screw placement, effectively shorten operation time, and improve surgical efficiency. To achieve the above objectives, the technical solution of this utility model includes a locking block, a threaded depressor, and a threaded sleeve. The locking block is securely mounted on a distal aiming bracket, with a slot at its lower part for fixing the threaded sleeve and a guide groove at its upper part to guide the threaded depressor into the threaded sleeve smoothly. The threaded sleeve is fixed in the slot of the locking block, and the threaded depressor is inserted into the threaded sleeve through the guide groove; the two are tightly engaged by threads. Rotating the threaded depressor allows it to gradually extend from the lower end of the threaded sleeve. Furthermore, the outer wall of the threaded depressor has graduations to mark the downward movement distance. The advantages and beneficial effects of this utility model are as follows: 1) Through the threaded engagement design of the threaded depressor and the threaded sleeve, the upward displacement deformation of the main nail in the sagittal position is precisely controlled. 2) The scale design on the threaded depressor allows doctors to make precise adjustments based on the patient's condition and the specifications of the main screw, and to pre-determine the downward movement distance of the threaded depressor, significantly improving surgical efficiency. Attached Figure Description

[0004] Figure 1 This is a schematic diagram of the structure of this utility model.

[0005] Figure 2 This is a front view of the present invention.

[0006] Figure 3 This is a side sectional view of the present invention.

[0007] Figure 4 This is a schematic diagram showing the separation of the threaded pressure rod and the threaded sleeve.

[0008] Figure 5 This is a sectional view showing the separation of the threaded pressure bar and the threaded sleeve.

[0009] Among them, there are threaded pressure rod 1, threaded sleeve 2, and clamping block 3. Detailed Implementation

[0010] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model. Example

[0011] A distal locking lever device for intramedullary nails includes a threaded depressor 1, a threaded sleeve 2, and a locking block 3. The locking block 3 is fixed to a distal aiming bracket, with a locking groove at its lower part to fix the threaded sleeve 2, and a guide groove at its upper part to guide the threaded depressor 1 into the threaded sleeve 2. The threaded depressor 1 and the threaded sleeve 2 are connected by threads; turning the threaded depressor 1 allows its lower end to gradually extend from the lower end of the threaded sleeve 2.

[0012] The outer wall of the threaded pressure rod 1 is marked with graduations indicating the downward movement distance.

[0013] Instructions for use: During intramedullary nailing surgery, after the main nail is inserted into the medullary cavity, when locking the interlocking nail at the distal end, place the threaded depressor 1 and the threaded sleeve 2 above the main nail in the sagittal position, and screw the threaded depressor 1 so that its lower end extends out and presses against the main nail until the distal interlocking nail is successfully inserted into the main nail.

[0014] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A distal locking lever device for an intramedullary nail, comprising a locking block; the locking block is fixed to a distal aiming bracket, characterized in that: It also includes a threaded pressure rod and a threaded sleeve; the locking block is designed with a lower locking groove, which is specifically used to fix the threaded sleeve; while its upper part is provided with a guide groove to guide the threaded pressure rod to smoothly insert downward into the threaded sleeve; the threaded sleeve is fixed on the locking block's locking groove, and the lower part of the threaded pressure rod is inserted into the threaded sleeve after passing through the guide groove of the locking block. The threaded pressure rod and the threaded sleeve are connected by threads, and by turning the threaded pressure rod, the threaded pressure rod gradually extends out from the lower end of the threaded sleeve.

2. The distal locking lever device for an intramedullary nail according to claim 1, characterized in that: The outer wall of the threaded pressure rod is provided with a scale for marking the downward movement distance of the threaded pressure rod.

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