Miniature intramedullary nail surgical instrument

Abstract

The utility model discloses a miniature intramedullary nail surgical instrument which comprises a screwdriver rod, one end of the screwdriver rod is fixedly provided with an assembling column, and the outer wall of one end of the assembling column is sequentially sleeved with a rotating cylinder and a transmission cylinder. Through the designed assembling column, the rotating cylinder, the transmission cylinder, the spring, the adjusting sleeve and the synchronous block, when a screwdriver is used for fastening and screwing an intramedullary nail, the spring applies elastic force to the transmission cylinder to extrude the transmission cylinder, so that the slopes of the transmission cylinder and the screwdriver are attached to each other, and the rotating cylinder rotates to fasten and screw the intramedullary nail. The inclined faces of the rotating cylinder and the transmission cylinder synchronously rotate under the torsion effect and the friction resistance effect, meanwhile, a ship owner drives the screwdriver rod to rotate under the effect of the synchronous block, when the screwdriver rod is screwed to the optimal screwing force, screwing continues, and the torque acting force generated by the inclined faces of the transmission cylinder and the rotating cylinder is larger than the elastic force of the spring. Therefore, the transmission cylinder is pushed to move on the assembly column to be separated from the rotating cylinder, the screwing acting force is stopped in time, and the situation that an operation site is injured due to excessive screwing of the intramedullary nail is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of surgical instruments, and in particular relates to a micro intramedullary nail surgical instrument. Background Art

[0002] Intramedullary nail is an orthopedic internal fixation device among medical devices. Its structure comprises an intramedullary nail rod, a proximal locking screw hole is arranged at the proximal end of the intramedullary nail rod, and a decompression plane is arranged on the surface of the intramedullary nail rod. During the operation, surgical instruments are used to fix the intramedullary nail, among which the screwdriver tool of the surgical instrument is an important instrument for fixing the intramedullary nail.

[0003] The screwdriver in the existing intramedullary nail surgical instrument is composed of a handle and a screwdriver rod. The screwdriver rod is aligned with the screwing groove of the intramedullary nail to screw and tighten the intramedullary nail fixing structure. However, there are the following defects:

[0004] (1) When using the screwdriver tool in the existing intramedullary nail surgical instrument, the hand is used to twist the handle, but it is difficult to control the tightening force. The problem of over-tightening often occurs, which affects the surgical effect and causes harm to the surgery. For this reason, we propose a micro intramedullary nail surgical instrument. Utility Model Content

[0005] The utility model aims to provide a micro intramedullary nail surgical instrument to solve the problem that the screwing force of the surgical instrument screwdriver tool proposed in the above background technology cannot be accurately controlled and over-tightening easily occurs.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a micro intramedullary nail surgical instrument, comprising a screwdriver rod, an assembly column is fixed at one end of the screwdriver rod, a rotating cylinder and a transmission cylinder are sequentially sleeved on the outer wall of one end of the assembly column, an adjustment sleeve is threadedly connected to the outer wall of the other end of the assembly column, a spring is arranged between the adjustment sleeve and the transmission cylinder, a synchronization groove is opened on the inner wall of the transmission cylinder, a synchronization block is arranged inside the synchronization groove, and the synchronization block is fixed on the outer wall of the assembly column.

[0007] Preferably, a rotating groove with a circular cross-section is opened on the outer wall of the assembling column, an inner block is arranged inside the rotating groove, and the inner block is fixed on the inner wall of the rotating cylinder.

[0008] Preferably, a spherical groove is formed on the end surface of the assembly column, and a ball is embedded in the spherical groove.

[0009] Preferably, the longitudinal cross-sections of the rotating cylinder and the transmission cylinder are both circular structures, and the outer diameters of the rotating cylinder and the transmission cylinder are equal.

[0010] Preferably, the slopes of the inclined surfaces arranged on adjacent surfaces of the rotating cylinder and the transmission cylinder are equal.

[0011] Preferably, the outer wall of the rotary cylinder is covered with a second anti-slip sleeve, and the outer wall of the adjustment sleeve is covered with a first anti-slip sleeve.

[0012] Preferably, the longitudinal section of the adjusting sleeve is a circular structure, and the cross section of the adjusting sleeve is a T-shaped structure.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] (1) The assembly column with the adjustment sleeve, the rotary cylinder, the transmission cylinder, the spring, the adjustment sleeve and the synchronization block is designed, and the assembly column with the adjustment sleeve, the rotary cylinder and the transmission cylinder is connected to the screwdriver rod. The compression degree of the spring is changed by screwing the adjustment sleeve to achieve the optimal elastic force adjustment of the utility model. When the intramedullary nail is tightened and screwed by the screwdriver, the spring exerts elastic force on the transmission cylinder to make the inclined surfaces of the two fit together. The rotary cylinder rotates, and the inclined surfaces of the rotary cylinder and the transmission cylinder rotate synchronously under the torsion effect and the friction resistance. At the same time, the screwdriver rod is driven to rotate under the action of the synchronization block. When After it is screwed to the optimal tightening force, it continues to screw down. The torque force generated by the inclined surfaces of the transmission cylinder and the rotary cylinder is greater than the elastic force of the spring, thereby pushing the transmission cylinder to move on the assembly column and separate from the rotary cylinder. The screwing force is stopped in time, effectively avoiding excessive tightening of the intramedullary nail and causing damage to the surgical site. The rotary cylinder is rotatably installed on the assembly column through the designed rotation groove and inner block to avoid falling off. The designed ball has a lubrication effect to reduce the wear of the end faces of the rotary cylinder and the assembly column. The designed first anti-slip sleeve and second anti-slip sleeve increase the friction and anti-slip effect of the outer walls of the rotary cylinder and the adjustment sleeve to avoid hand slippage when screwing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is an assembly cross-sectional view of the assembly column, the rotating cylinder and the transmission cylinder of the utility model;

[0017] Figure 3 It is an assembly side view of the transmission cylinder and the assembly column of the utility model;

[0018] Figure 4 It is a three-dimensional diagram of the assembly column of the utility model;

[0019] In the figure: 1. Screwdriver rod; 2. Assembly column; 3. First anti-slip sleeve; 4. Adjustment sleeve; 5. Spring; 6. Rotary cylinder; 7. Second anti-slip sleeve; 8. Transmission cylinder; 9. Rotary groove; 10. Ball; 11. Inner block; 12. Synchronous groove; 13. Synchronous block. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example

[0022] See also Figures 1 to 4 The utility model provides a technical solution: a micro intramedullary nail surgical instrument, comprising a screwdriver rod 1, an assembly column 2 is fixed at one end of the screwdriver rod 1, a rotating cylinder 6 and a transmission cylinder 8 are sequentially sleeved on the outer wall of one end of the assembly column 2, an adjusting sleeve 4 is connected to the outer wall of the other end of the assembly column 2 by a thread, a spring 5 is arranged between the adjusting sleeve 4 and the transmission cylinder 8, a synchronous groove 12 is opened on the inner wall of the transmission cylinder 8, a synchronous block 13 is arranged inside the synchronous groove 12, and the synchronous block 13 is fixed on the outer wall of the assembly column 2, through The assembly column 2, the rotary cylinder 6, the transmission cylinder 8, the spring 5, the adjustment sleeve 4 and the synchronization block 13 are designed. The assembly column 2 with the adjustment sleeve 4, the rotary cylinder 6 and the transmission cylinder 8 is connected to the screwdriver rod 1. The compression degree of the spring 5 is changed by screwing the adjustment sleeve 4 to adjust the elastic force of the utility model to the best. When the intramedullary nail is tightened and screwed with a screwdriver, the spring 5 applies elastic force to the transmission cylinder 8 to make the inclined surfaces of the two fit together. When the rotary cylinder 6 is rotated, the inclined surfaces of the rotary cylinder 6 and the transmission cylinder 8 are adjusted. The surface rotates synchronously under the torsion effect and the friction resistance. At the same time, the ship owner 8 drives the screwdriver rod 1 to rotate under the action of the synchronization block 13. When it is screwed to the optimal tightening force, it continues to be screwed down. The torque force generated by the inclined surfaces of the transmission cylinder 8 and the rotary cylinder 6 is greater than the elastic force of the spring 5, thereby pushing the transmission cylinder 8 to move on the assembly column 2 and separate from the rotary cylinder 6. The screwing force is stopped in time, effectively avoiding excessive tightening of the intramedullary nail and causing damage to the surgical site. The outer wall of the assembly column 2 is provided with a circular cross-section The rotating groove 9 has an inner block 11 inside. Through the designed rotating groove 9 and the inner block 11, the rotating cylinder 6 is rotatably installed on the assembling column 2 to avoid falling off. The inner block 11 is fixed on the inner wall of the rotating cylinder 6. The end face of the assembling column 2 is provided with a spherical groove, and the spherical groove is inlaid with a ball 10. The designed ball 10 plays a lubricating role and reduces the wear of the end faces of the rotating cylinder 6 and the assembling column 2. The longitudinal sections of the rotating cylinder 6 and the transmission cylinder 8 are both circular structures, and the outer diameters of the rotating cylinder 6 and the transmission cylinder 8 are equal.

[0023] In the present embodiment, preferably, the slopes of the inclined surfaces arranged on the adjacent surfaces of the rotating cylinder 6 and the transmission cylinder 8 are equal, the outer wall of the rotating cylinder 6 is provided with a second anti-slip sleeve 7, and the outer wall of the adjusting sleeve 4 is provided with a first anti-slip sleeve 3. By designing the first anti-slip sleeve 3 and the second anti-slip sleeve 7, the friction and anti-slip effect of the outer walls of the rotating cylinder 6 and the adjusting sleeve 4 is increased to avoid hand slippage during twisting. The longitudinal section of the adjusting sleeve 4 is a circular structure, and the cross-section of the adjusting sleeve 4 is a T-shaped structure.

[0024] The working principle and use process of the utility model are as follows: the utility model connects an assembly column 2 with a structure including an adjusting sleeve 4, a rotary cylinder 6 and a transmission cylinder 8 to a screwdriver rod 1, and changes the compression degree of the spring 5 by screwing the adjusting sleeve 4 to achieve the optimal adjustment of the elastic force of the utility model. When a screwdriver is used to tighten and screw the intramedullary nail, the spring 5 applies elastic force to the transmission cylinder 8 to squeeze the inclined surfaces of the two so that the inclined surfaces of the two are fitted together, and the rotary cylinder 6 is rotated. The inclined surfaces of the rotary cylinder 6 and the transmission cylinder 8 rotate synchronously under the torsional effect and the friction resistance. At the same time, the screwdriver rod 1 is driven to rotate by the synchronous block 13. When it is screwed to the optimal tightening force, it continues to be screwed down. The torque force generated by the inclined surfaces of the transmission cylinder 8 and the rotary cylinder 6 is greater than the elastic force of the spring 5, thereby pushing the transmission cylinder 8 to move on the assembly column 2 and separate from the rotary cylinder 6, and stopping the screwing force in time, effectively avoiding excessive tightening of the intramedullary nail and causing damage to the surgical site.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A micro intramedullary nail surgical instrument, comprising a screwdriver rod (1), characterized in that: An assembly column (2) is fixed to one end of the screwdriver rod (1); a rotating cylinder (6) and a transmission cylinder (8) are sequentially sleeved on the outer wall of one end of the assembly column (2); an adjustment sleeve (4) is threadedly connected to the outer wall of the other end of the assembly column (2); a spring (5) is arranged between the adjustment sleeve (4) and the transmission cylinder (8); a synchronization groove (12) is provided on the inner wall of the transmission cylinder (8); a synchronization block (13) is arranged inside the synchronization groove (12); and the synchronization block (13) is fixed on the outer wall of the assembly column (2).

2. A micro intramedullary nail surgical instrument according to claim 1, characterized in that: The outer wall of the assembly column (2) is provided with a rotating groove (9) with a circular cross section, and an inner block (11) is arranged inside the rotating groove (9), and the inner block (11) is fixed on the inner wall of the rotating drum (6).

3. A micro intramedullary nail surgical instrument according to claim 2, characterized in that: The end surface of the assembly column (2) is provided with a spherical groove, and a ball (10) is embedded in the spherical groove.

4. The micro intramedullary nail surgical instrument according to claim 1, characterized in that: The longitudinal sections of the rotating cylinder (6) and the transmission cylinder (8) are both circular structures, and the outer diameters of the rotating cylinder (6) and the transmission cylinder (8) are equal.

5. A micro intramedullary nail surgical instrument according to claim 4, characterized in that: The inclined surfaces arranged on the adjacent surfaces of the rotating cylinder (6) and the transmission cylinder (8) have the same inclination.

6. The micro intramedullary nail surgical instrument according to claim 1, characterized in that: The outer wall of the rotary cylinder (6) is sleeved with a second anti-slip sleeve (7), and the outer wall of the adjustment sleeve (4) is sleeved with a first anti-slip sleeve (3).

7. The micro intramedullary nail surgical instrument according to claim 1, characterized in that: The longitudinal section of the adjusting sleeve (4) is a circular structure, and the cross section of the adjusting sleeve (4) is a T-shaped structure.

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