Far-end aiming arm of intramedullary nail far-end aiming device

Abstract

The utility model relates to an orthopedic medical instrument, in particular to an instrument for treating left and right long bones, and more particularly relates to a far-end aiming arm of an intramedullary nail far-end sighting device, which comprises an aiming arm main body and a connecting part, wherein the aiming arm main body comprises an aiming part positioned at the far end of the aiming arm main body and a connecting part positioned at the near end of the aiming arm main body; the connecting part is used for being connected to a left conversion block or a right conversion block, the connecting part is bent in an arc shape along the two side faces of the connecting part, and the aiming part is provided with a first guide hole, a second guide hole and a limiting groove which is transverse to the first guide hole and communicated with the first guide hole. The far-end aiming arm can be suitable for aiming and positioning far-end locking holes of intramedullary nails on the left side and the right side. Due to the design, the number of surgical instruments of the far-end sighting device is reduced, the instrument cost is reduced, and meanwhile convenience is brought to surgical operation of doctors.

Description

TECHNICAL FIELD

[0001] The utility model relates to orthopedics medical instrument, and specifically relates to the instrument of left and right distinction long bone treatment, more specifically relates to a far end sighting arm of intramedullary nail far end sighting device. BACKGROUND

[0002] Intramedullary nail belongs to orthopedics internal fixation instrument in medical instrument, especially suitable for treating long tubular bone fracture. When performing intramedullary nail operation, the far end of long bone is usually assisted and aimed in extracorporeal by using intramedullary nail far end sighting device (or called sighting system) to implant locking pin in the lock hole of intramedullary nail far end.

[0003] In the prior art, the alignment directions of the far end locking holes of the left and right intramedullary nails are different, wherein the bending shape and the alignment direction of the far end locking hole of the left intramedullary nail are in mirror image state with the bending shape and the alignment direction of the far end locking hole of the right intramedullary nail. However, in the prior art, different far end sighting arms in the sighting device are needed for aiming at the left and right different intramedullary nails. This directly increases the surgical instruments and the cost, and brings inconvenience to the operation to some extent. SUMMARY

[0004] The utility model discloses a kind of far end sighting arms of intramedullary nail far end sighting device, to solve the problem that the alignment directions of the far end locking holes of the left and right intramedullary nails are different in the prior art, two different far end sighting arms are needed to be made, and provide a kind of far end sighting arm of intramedullary nail far end sighting device.

[0005] The utility model discloses the technical scheme that the technical problem thereof adopts is as follows:

[0006] A kind of far end sighting arm of intramedullary nail far end sighting device, comprising: sighting arm main part, with longitudinal center line o, the surface close to bone surface is surface a, the surface away from bone surface is surface b, and the two side surfaces between surface a and b, the sighting arm main part includes the aiming part at its far end and the connecting part at its proximal end, the connecting part is used to connect to left conversion block or right conversion block, the connecting part is along its two side surfaces and is curved as a circular arc;

[0007] The aiming part is used to aim at the far end hole of intramedullary nail, the aiming part is provided with two first guide holes and second guide holes along the center line o, which pass through its surface a, b, the first guide hole is used to aim at the first locking hole in the far end hole of intramedullary nail, the second guide hole is used to aim at the second locking hole in the far end hole of intramedullary nail, the side surface of the aiming part is provided with the limiting slot transverse to the first guide hole and communicated with it.

[0008] When the left conversion block is connected to the surface b of the connecting part, the distal aiming arm is adapted to aim at the intramedullary nail on the left side; when the right conversion block is connected to the surface a of the connecting part, the distal aiming arm is adapted to aim at the intramedullary nail on the right side.

[0009] The working principle of the distal aiming arm of the utility model is as follows: the corresponding conversion block is connected to one side of the distal aiming arm close to the bone surface, and the distal aiming arm is adapted to aim at the intramedullary nail corresponding to the conversion block. Because the distal aiming arm is curved and the first and second guide holes on the surfaces a and b are mirror image arranged, the distal aiming arm is flipped 180°, the surfaces a and b of the distal aiming arm are switched, and actually the surfaces a and b close to and away from the bone surface are switched. When the left conversion block is connected to the surface b of the connecting part, the distal aiming arm is adapted to aim at the intramedullary nail on the left side; when the right conversion block is connected to the surface a of the connecting part, the distal aiming arm is adapted to aim at the intramedullary nail on the right side.

[0010] Further, the surface a of the aiming part is marked with an "L" character, and the surface b of the aiming part is marked with an "R" character. When the surface of the aiming part with the "L" character is the surface away from the bone surface, the surface b of the connecting part is connected to the left conversion block, and the distal aiming arm is adapted to aim at the intramedullary nail on the left side; when the surface of the aiming part with the "R" character is the surface away from the bone surface, the surface a of the connecting part is connected to the right conversion block, and the distal aiming arm is adapted to aim at the intramedullary nail on the right side.

[0011] Further, the four corners of the cross section of the connecting part are provided with four inclined surfaces with the same width and slope.

[0012] Further, at least two gear holes are formed on the connecting part and penetrate the surfaces a and b, and the at least two gear holes are arranged along the center line o in sequence to connect the distal aiming arm to the left conversion block or the right conversion block at different positions.

[0013] Further, the groove bottom of the limiting groove is provided with two opposite holes penetrating the groove bottom.

[0014] Further, the aiming arm body further comprises a limiting assembly partially embedded in the limiting groove, the limiting assembly comprising a cap, a spring and a button, one end of the button being a pressing end, the other end being provided with an open groove in the middle of the surface, the open groove making the end of the button form two opposite plugs corresponding to the two holes, each of the two plugs being provided with a blind hole on the end surface, one side of the button being provided with a first groove matching the first guide hole, the bottom surface of the open groove being provided with a limiting hole accommodating part of the spring; the cap is provided with two bosses, the spring is arranged in the limiting hole, the button is inserted into the limiting groove, the pressing end is outside the limiting groove, the two plugs pass through the two holes to be connected with the cap, and the button is connected with the cap by inserting the two bosses into the two blind holes.

[0015] Further, the aiming arm body further comprises a positioning sleeve and a positioning rod, the positioning rod being provided with an annular groove arranged in the circumferential direction, the positioning sleeve being provided with a window arranged in the axial direction, the positioning rod being inserted into the positioning sleeve so that the annular groove is exposed in the window, the positioning sleeve being adapted to be inserted into the first guide hole, and the front end of the positioning rod being capable of reaching the first locking hole of the intramedullary nail.

[0016] Further, the side surface of the aiming part is provided with two through holes for connecting lateral supports, the through holes being arranged between the first guide hole and the second guide hole and along the center line o.

[0017] Further, the aiming arm body is made of a material that can be penetrated by X-rays.

[0018] Further, the material is carbon fiber.

[0019] The distal aiming arm of the distal aiming device for intramedullary nail has the following advantages: the curved shapes of the surfaces a and b of the aiming arm body and the first guide hole and the second guide hole thereon are mirror image arranged, so that the surfaces a and b of the aiming arm body can be switched with each other, when the left conversion block is connected to the surface b of the connecting part, the distal aiming arm is suitable for aiming at the left intramedullary nail, and when the right conversion block is connected to the surface a of the connecting part, the distal aiming arm is suitable for aiming at the right intramedullary nail. In this way, the same distal aiming arm can be used to aim at and position the distal locking holes of the intramedullary nails on the left and right sides. This design reduces the number of surgical instruments of the distal aiming device, thereby reducing the cost of instruments and bringing convenience to the operation of doctors. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the distal aiming arm of the embodiment;

[0021] Figure 2is the front view of the surface a and the surface b which are mirror images of the aiming arm body in the embodiment;

[0022] Figure 3 is Figure 2 is the enlarged view of the A-A section in the embodiment;

[0023] Figure 4 is the structure enlarged view of the limiting assembly in the embodiment;

[0024] Figure 5 is the partial section enlarged view of the aiming arm body and the limiting assembly after being assembled in the natural state in the embodiment;

[0025] Figure 6 is the partial section enlarged view of the aiming arm body and the limiting assembly after being assembled in the pressing state in the embodiment;

[0026] Figure 7 is the assembly view of the distal aiming device of the intramedullary nail.

[0027] In the figure, 1 is the distal aiming arm, 11 is the aiming arm body, 111 is the aiming part, 112 is the connecting part, 113 is the blocking hole, 114 is the first guide hole, 115 is the second guide hole, 116 is the limiting groove, 117 is the hole, 118 is the through hole, 119 is the inclined surface, 2 is the left conversion block, 3 is the handle, 4 is the intramedullary nail, 41 is the first locking hole, 42 is the second locking hole, 5 is the limiting assembly, 51 is the cap, 511 is the boss, 52 is the spring, 53 is the button, 531 is the pressing end, 532 is the open groove, 533 is the plug, 534 is the blind hole, 535 is the limiting hole, 536 is the first groove, 6 is the positioning sleeve rod assembly, and 7 is the lateral support. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clearly and clearly, the following is further detailed by the embodiment, and the distal aiming arm of the distal aiming device of the intramedullary nail of the utility model is further detailed by combining with the drawings. The proximal end and the distal end are named according to the distance between the intramedullary nail aiming device and the operator. The proximal end refers to the end of the intramedullary nail aiming device close to the operator, and the distal end refers to the end of the intramedullary nail aiming device far away from the operator. It should be understood that the specific embodiments described herein are only illustrative and are not used to limit the utility model.

[0029] As Figures 1-3As shown, the embodiment provides a distal aiming arm 1 of a distal aiming device of an intramedullary nail. Taking the left intramedullary nail as an example, the structure of the distal aiming arm 1 comprises an aiming arm body 11 having a longitudinal center line o, a surface a away from the bone surface, a surface b close to the bone surface, and two side surfaces between the surfaces a and b. The aiming arm body 11 comprises an aiming part 111 at the distal end thereof and a connecting part 112 at the proximal end thereof. The surface b of the connecting part 112 is connected with a left conversion block 2. The center line o of the connecting part 112 is curved in a circular arc. The connecting part 112 is provided with nine gear holes penetrating the surfaces a and b and arranged along the center line o. The gear holes are marked with numbers. The distal end of the intramedullary nail corresponds to the position of the connecting part 112 with the numbers to indicate the length of the intramedullary nail. Figure 3 As shown, in order to be the same as the cross-sectional shape of the left and right conversion blocks, the four corners of the cross section of the connecting part are provided with four inclined surfaces 119 with the same width and inclination.

[0030] The aiming part 111 is provided with a first guide hole 114 and a second guide hole 115 penetrating the surfaces a and b along the center line o. The guide holes are respectively used for aiming at the first locking hole 41 and the second locking hole 42 in the distal hole of the intramedullary nail. The side surface of the aiming part 111 is provided with a limiting groove 116 transverse to the first guide hole 114 and communicating with the first guide hole 114.

[0031] In order to aim at the right intramedullary nail, the distal aiming arm 1 is turned over by 180°. The surfaces a and b of the distal aiming arm are switched with each other. The surface a of the connecting part 112 is connected with a right conversion block 2. At this time, the surface a becomes the surface close to the bone surface, and the surface b becomes the surface away from the bone surface. This kind of connection mode indicates that the distal aiming arm 1 is suitable for aiming at the right intramedullary nail.

[0032] Preferably, in order to facilitate the doctor to distinguish the left and right sides during the operation, the surface a of the aiming part 111 is marked with an “L” letter (L means left), and the surface b of the aiming part 111 is marked with an “R” letter (R means right).

[0033] Preferably, the bottom of the limiting groove 116 is provided with two opposite holes 117 penetrating the groove bottom.

[0034] Preferably, as shown in Figure 4As shown, the aiming arm body 11 further comprises a limiting assembly 5 partially embedded in the limiting slot 116, which is used to lock the positioning sleeve rod assembly 6 inserted into the first guide hole 114. The limiting assembly 5 comprises a cap 51, a spring 52 and a button 53. One end of the button 53 is a pressing end 531, and the other end is provided with an open groove 532 in the middle of the end face. The open groove 532 makes the end of the button 53 form two opposite plug-in heads 533 corresponding to the two holes 117. Each of the plug-in heads 533 is provided with a blind hole 534 on the end face. The bottom surface of the open groove 532 is provided with a limiting hole 535 for accommodating part of the spring 53. One side surface of the button 53 is provided with a first groove 536 matching the first guide hole 114. The cap 51 is provided with two bosses 511. The spring 52 is partially placed in the limiting hole 535. The button 53 is inserted into the limiting slot 116, and the pressing end 531 is outside the limiting slot 116. The two plug-in heads 533 pass through the two holes 117 and are connected with the cap 51. The connection between the button 53 and the cap 51 is achieved by inserting the two bosses 511 into the two blind holes 534.

[0035] In a natural state, as shown in Figure 5 As shown, the first groove 536 of the limiting assembly 5 is misaligned with the first guide hole 114. In a pressed state, as shown in Figure 6 The button 53 is subjected to a force, so that the spring 53 is subjected to extrusion. The limiting assembly 5 slides, so that the first groove 536 and the first guide hole 114 are coincided. At this time, the positioning sleeve rod assembly 6 can be inserted into the first guide hole 114. Then, the force applied to the button 53 is removed. Under the action of the spring 52, the limiting assembly 5 is returned to the original position and clamps the positioning sleeve rod assembly 6. In this way, the positioning sleeve rod assembly 6 is locked in the first guide hole 114.

[0036] Preferably, the side surface of the aiming part 111 is provided with two through holes 118 for connecting the lateral support 7. The through holes 118 are arranged along the center line o between the first guide hole 114 and the second guide hole 115.

[0037] Preferably, the aiming arm body 11 is made of a material that can be penetrated by X-rays, such as carbon fiber.

[0038] The assembly method of the intramedullary nail distal end aiming device is as follows: as shown in Figure 7As shown, taking the left intramedullary nail 4 as an example, one end of the handle 3 is connected with the proximal end of the intramedullary nail 4, the left conversion block 2 is detachably connected to the other end of the handle 3, the surface b of the connecting part 112 is placed on the left conversion block 2, the left conversion block 2 is connected through a bolt passing through one of the gear holes 113, then the positioning sleeve rod assembly 6 is installed in the first guide hole 114, the second guide hole 115 on the aiming part 111 aims at the second locking hole 42 of the distal hole of the intramedullary nail, and then the first guide hole 114 aims at the first locking hole 41 of the distal hole of the intramedullary nail 4. The lateral support 7 is detachably connected to the side surface of the aiming part 111 through the two through holes 118, and is used for aiming at the long waist-shaped hole at the distal end of the left intramedullary nail 4. If the right intramedullary nail is aimed, the distal aiming arm 1 is turned over by 180°, the surface a of the connecting part 112 is connected with the right conversion block, and other installation operations remain unchanged.

[0039] It should be noted that the number of gear holes can be increased or decreased as needed.

[0040] In summary, the above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A distal aiming arm (1) of a distal aiming device of an intramedullary nail, characterized in that The application relates to a distal aiming arm (1) for aiming at the distal end hole of an intramedullary nail, comprising: an aiming arm body (11) with a longitudinal center line o, a surface a far from a bone surface, a surface b close to the bone surface, and two side surfaces between the surface a and the surface b, the aiming arm body (11) comprising an aiming part (111) at the distal end thereof and a connecting part (112) at the proximal end thereof, the connecting part (112) being used for being connected to a left conversion block (2) or a right conversion block, and the connecting part (112) being curved in a circular arc along the two side surfaces thereof; the aiming part (111) is used for aiming at the distal end hole of the intramedullary nail, the aiming part is provided with two first guide holes (114) and second guide holes (115) penetrating the surfaces a and b thereof along the center line o, the first guide holes (114) are used for aiming at first locking holes (41) in the distal end hole of the intramedullary nail, the second guide holes (115) are used for aiming at second locking holes (42) in the distal end hole of the intramedullary nail, and the side surface of the aiming part (111) is provided with a limiting slot (116) transverse to the first guide holes (114) and communicating with the first guide holes (114); when the surface b of the connecting part (112) is connected with the left conversion block, the distal aiming arm (1) is suitable for aiming at the intramedullary nail on the left side; and when the surface a of the connecting part (112) is connected with the right conversion block, the distal aiming arm (1) is suitable for aiming at the intramedullary nail on the right side.

2. The remote aiming arm (1) according to claim 1, characterized in that the surface a of the aiming part (111) is marked with an "L" character, and the surface b of the aiming part (111) is marked with an "R" character.

3. The remote aiming arm (1) according to claim 1, characterized in that four corners of the cross section of the connecting part (112) are provided with four inclined surfaces (119) with the same width and inclination.

4. The remote aiming arm (1) according to claim 1, characterized in that at least two gear holes (113) penetrating the surfaces a and b of the connecting part (112) are formed on the connecting part (112), the at least two gear holes (113) are arranged in sequence along the center line o, so that the distal aiming arm (1) is connected to the left conversion block (2) or the right conversion block at different positions.

5. The remote aiming arm (1) according to claim 1, characterized in that the slot bottom of the limiting slot (116) is provided with two opposite holes (117) penetrating the slot bottom.

6. The remote aiming arm (1) according to claim 5, characterized in that The aiming arm body (11) further comprises a limiting assembly (5) partially embedded in the limiting groove (116), the limiting assembly (5) comprising a cap (51), a spring (52) and a button (53), one end of the button (53) being a pressing end (531), the other end being provided with an open groove (532) in the middle of the surface, the open groove (532) making the end of the button (53) form two opposite plug-in heads (533) corresponding to the two holes (117), each of the two plug-in heads (533) being provided with a blind hole (534) on the end surface, one side of the button (53) being provided with a first groove (536) matching the first guide hole (114), the bottom surface of the open groove (532) being provided with a limiting hole (535) accommodating part of the spring (52); the cap (51) is provided with two bosses (511), the spring (52) is placed in the limiting hole (535), the button (53) is inserted into the limiting groove (116), the pressing end (531) is outside the limiting groove (116), the two plug-in heads (533) pass through the two holes (117) and are connected with the cap (51), and the connection between the button (53) and the cap (51) is achieved by inserting the two bosses (511) into the two blind holes (534).

7. The remote aiming arm (1) according to claim 1, characterized in that The side surface of the aiming part (111) is provided with two through holes (118) for connecting lateral supports (7), the through holes (118) being arranged between the first guide hole (114) and the second guide hole (115) and along the center line o.

8. Remote aiming arm (1) according to any one of claims 1-7, characterized in that The aiming arm body (11) is made of a material that can be penetrated by X-rays.

9. The remote aiming arm (1) according to claim 8, characterized in that The material is carbon fiber.

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