A distal locking hole positioning assembly for an intramedullary nail

Abstract

The utility model relates to medical instrument technical field, concretely relates to a intramedullary nail far -end lock hole positioning assembly, including main nail fixed beam and rocker, the intramedullary nail far -end lock hole positioning assembly still includes: the length adjusting portion between the rocker and main nail fixed beam is equipped with, the length adjusting portion is used for adjusting the interval size between the rocker and main nail fixed beam, the support column of vertical fixed is equipped with the free end of the rocker, the utility model discloses through can position intramedullary nail far -end lock hole axial distance before intramedullary nail uses, the state of length adjusting portion is locked, and under the premise that length adjusting portion does not change, the axial distance of the intramedullary nail far -end lock hole after positioning is used, make the rocker angle change and intramedullary nail curvature change close to each other, thereby make the positioning error in the half length range of the lock hole of waist shape, again cooperate the orientation of the circumferential positioning lock hole with odd number design's guide block, improve the accuracy that femur upper hole position and lock hole correspond.

Description

Technical Field

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

[0002] When using an intramedullary nail in surgery, a hole is first made in the femoral head to connect to the medullary canal. Then, a positioning component is used to pre-locate the position of the locking hole at the distal end of the intramedullary nail. The intramedullary nail is then inserted into the medullary canal, and the fractured bones are sequentially connected to the intramedullary nail. Next, the position between the bones is corrected, and a locking screw is used to fix the proximal end of the intramedullary nail to the femoral head. The positioning component is used again to locate the position of the locking hole at the distal end of the intramedullary nail within the fractured bone. Finally, a locking screw is inserted through the fractured bone into the locking hole at the distal end of the intramedullary nail, thus completing the bone-setting surgery.

[0003] Because the physiological curvature of the medullary cavity varies from person to person, after the intramedullary nail is inserted into the medullary cavity, the bending degree of the intramedullary nail will change under the influence of stress, and the orientation of the distal locking hole will be axially deflected, making it difficult to accurately locate the position and orientation of the distal locking hole of the intramedullary nail. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a positioning component for the distal locking hole of an intramedullary nail, so as to solve the problem of difficulty in accurately locating the position and orientation of the distal locking hole of the intramedullary nail.

[0005] To achieve the above objectives, this utility model provides a distal locking hole positioning assembly for intramedullary nails, including a main nail fixing beam and a rocker arm. The distal locking hole positioning assembly for intramedullary nails further includes:

[0006] A length adjustment section is provided between the rocker arm and the main nail fixing beam, the length adjustment section being used to adjust the distance between the rocker arm and the main nail fixing beam.

[0007] A support column is vertically fixed at the free end of the rocker arm.

[0008] A horizontal beam is fixed to the top of the support column, and the horizontal beam is perpendicular to the rocker arm in the horizontal direction.

[0009] A connecting seat is fixedly installed at one end of the crossbeam.

[0010] Two clamping blocks are respectively disposed on the connecting seat.

[0011] A drive unit provided on the connecting seat is used to drive the two clamping blocks to move closer to or further away from each other along the axial direction of the crossbeam.

[0012] Preferably, the distal keyhole positioning assembly of the intramedullary nail further includes:

[0013] An insertion hole is provided at one end of the main nail fixing beam, and a first blocking member is provided inside the insertion hole.

[0014] A second blocking member is provided on the outside of the proximal end of the intramedullary nail. The second blocking member cooperates with the first blocking member and is used to prevent circumferential rotation of the intramedullary nail.

[0015] Preferably, the first blocking member includes at least one guide strip circumferentially disposed on the inner wall of the insertion hole.

[0016] Preferably, the second blocking member includes at least one guide groove circumferentially disposed outside the proximal end of the intramedullary nail.

[0017] Preferably, the length adjustment part includes an extension rod fixedly mounted on the main nail fixing beam, a limiting groove is provided transversely inside the extension rod, a connecting rod is slidably sleeved in the limiting groove, a connecting block is fixedly mounted at one end of the limiting groove away from the main nail fixing beam, and the connecting block is slidably connected to a limiting groove vertically mounted on the connecting rod.

[0018] Preferably, the end of the rocker arm away from the support column is hinged to the end of the connecting rod away from the main nail fixing beam.

[0019] Preferably, the length adjustment part further includes a long through groove communicating between the top of the extension rod and the limiting groove, and a slider is provided on one end of the connecting rod near the main nail fixing beam, the top of the slider being slidably fitted inside the long through groove.

[0020] A locking screw, threaded vertically through the slider and the connecting rod, is used to secure them.

[0021] Preferably, the intramedullary nail distal locking hole positioning assembly further includes a protractor fixedly mounted on the rocker arm. The protractor is located at the hinge of the rocker arm and the connecting rod, and is used to measure the midline position of the positioning intramedullary nail distal locking hole.

[0022] The beneficial effects of this utility model are:

[0023] This invention, by aligning the movement direction of the clamping block with the axial direction of the crossbeam and coordinating the crossbeam with the horizontal direction perpendicular to the rocker arm axis and the waist-shaped design of the locking hole, allows for the positioning of the axial distance of the distal locking hole of the intramedullary nail before use. This locks the length adjustment section and, without changing the length adjustment section, positions the axial distance of the distal locking hole of the intramedullary nail after use. This ensures that the change in rocker arm angle closely matches the change in the curvature of the intramedullary nail, thus minimizing the positioning error within half the length of the waist-shaped locking hole. Furthermore, the combination of the guide block and guide groove ensures that the distal locking hole of the intramedullary nail corresponds to the positioning hole on the connecting seat, improving the accuracy of the correspondence between the opening position on the femur and the locking hole, and preventing misalignment in the axial and circumferential directions of the femur. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 ;

[0026] Figure 2 This is a three-dimensional illustration of the present invention. Figure 2 ;

[0027] Figure 3 This is a three-dimensional illustration of the present invention. Figure 3 ;

[0028] Figure 4 This is a three-dimensional illustration of the present invention. Figure 4 .

[0029] The diagram is marked as follows:

[0030] 1. Main nail fixing beam; 2. Rocker arm; 3. Protractor; 4. Length adjustment part; 41. Extension rod; 42. Limiting groove; 43. Connecting rod; 44. Connecting block; 45. Limiting slide groove; 46. Long through groove; 47. Slider; 48. Locking screw; 5. Support column; 6. Crossbeam; 7. Clamping block; 8. Drive part; 81. Rotating shaft; 82. Inner cavity; 83. Transmission gear; 84. Cross through groove; 85. Gear; 86. Positioning hole; 9. Main nail insertion hole; 10. Guide bar; 11. Guide groove; 12. Connecting seat. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0032] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] like Figures 1 to 4 As shown, an intramedullary nail distal locking hole positioning assembly includes a main nail fixing beam 1 and a rocker arm 2. The intramedullary nail distal locking hole positioning assembly also includes:

[0034] A length adjustment part 4 is provided between the rocker arm 2 and the main nail fixing beam 1. The length adjustment part 4 is used to adjust the distance between the rocker arm 2 and the main nail fixing beam 1.

[0035] A support column 5 is vertically fixed at the free end of the rocker arm 2.

[0036] A horizontal beam 6 is fixed to the top of the support column 5, and the horizontal beam 6 is perpendicular to the rocker arm 2 in the horizontal direction.

[0037] A connecting seat 12 is fixedly installed at one end of the crossbeam 6.

[0038] Two clamping blocks 7 are respectively located on the connecting seat 12.

[0039] A drive unit 8 is provided on the connecting seat 12. The drive unit 8 includes an inner cavity 82 inside the connecting seat 12. A rotating shaft 81 is rotatably connected between the top of the connecting seat 12 and the inner cavity 82. A transmission gear 83 is fixedly sleeved at the bottom end of the rotating shaft 81. Two transverse grooves 84 are transversely provided between the inside of the inner cavity 82 and the outside of the connecting seat 12. A toothed rod 85 is inserted inside the transverse groove 84. One end of the toothed rod 85 is fixedly connected to the clamping block 7. The tooth surfaces on both sides of the transmission gear 83 mesh with the tooth surfaces of the two toothed rods 85 respectively. A positioning hole 86 is vertically provided between the top of the rotating shaft 81 and the bottom of the connecting seat 12. The positioning hole 86 and the rotating shaft 81 are coaxial. The positioning hole 86 is also coaxial with the connecting seat 12. The axis of the positioning hole 86 is also the axis of symmetry between the two clamping blocks 7. The drive unit 8 is used to drive the two clamping blocks 7 to move closer or further apart along the axial direction of the crossbeam 6.

[0040] Before using the intramedullary nail, the length adjustment unit 4 is stretched so that the drive unit 8 drives the two clamping blocks 7 to approach each other and clamp at the midline of the distal locking hole of the intramedullary nail. Since the locking hole of the intramedullary nail is waist-shaped and relatively long, the clamping blocks 7 clamp at the midline of the locking hole, and the crossbeam 6 is perpendicular to the rocker arm 2 in the horizontal direction, thus positioning the distance of the locking hole in the axial direction of the intramedullary nail. After the intramedullary nail is used, when repositioning the locking hole, the curvature of the intramedullary nail will match the curvature of the femur, meaning the curvature of the intramedullary nail will change. While keeping the length of the length adjustment unit 4 unchanged from the initial adjustment, the rocker arm 2 is deflected and the clamping blocks 7 clamp the femur, thus changing the deflection angle of the rocker arm 2. The moving direction of the clamping block 7 and the axis of the crossbeam 6 are in the same vertical plane, and the crossbeam 6 and the rocker arm 2 are perpendicular to each other in the horizontal direction. This makes the change in the deflection angle of the rocker arm 2 close to the change in the curvature of the intramedullary nail. Combined with the waist-shaped locking hole design, the final hole positioning error can be less than the general length of the locking hole. In this way, the midpoint between the two clamping blocks 7 can be the hole opening point, which is only slightly off from the center line of the locking hole, but the hole opening point is still within the range of the locking hole. Then, the drill bit of the drilling machine can be passed through the inside of the positioning hole 86 from top to bottom, so that the hole in the femur can be drilled more accurately, and the hole in the femur can correspond to and connect with the distal locking hole of the intramedullary nail, avoiding circumferential misalignment between the hole in the femur and the locking hole.

[0041] like Figure 2 As shown, the distal keyhole positioning assembly for the intramedullary nail also includes:

[0042] An insertion hole 9 is provided at one end of the main nail fixing beam 1, and a first blocking member 10 is provided inside the insertion hole 9.

[0043] A second blocking member 11 is provided on the outside of the proximal end of the intramedullary nail. The second blocking member 11 cooperates with the first blocking member 10 and is used to prevent the intramedullary nail from rotating circumferentially.

[0044] The first blocking member 10 includes at least one guide strip circumferentially disposed on the inner wall of the socket 9.

[0045] The second blocking member 11 includes at least one guide groove circumferentially located outside the proximal end of the intramedullary nail.

[0046] Before using the intramedullary nail, unscrew the cap of the intramedullary nail, align the guide groove on the proximal end of the intramedullary nail with the guide strip in the insertion hole 9 and insert it into the insertion hole 9. Then screw on the cap of the intramedullary nail to fix the proximal end of the intramedullary nail to the main nail fixation beam 1. This ensures that when the intramedullary nail is driven into the femur, the distal locking hole of the intramedullary nail always faces the bottom of the connector 12, so that the hole drilled in the femur can correspond to and communicate with the locking hole, thereby improving the drilling positioning accuracy.

[0047] like Figures 1 to 4As shown, the length adjustment part 4 includes an extension rod 41 fixedly mounted on the main nail fixing beam 1. A limiting groove 42 is provided transversely inside the extension rod 41. A connecting rod 43 is slidably mounted inside the limiting groove 42. A connecting block 44 is fixedly mounted at one end of the limiting groove 42 away from the main nail fixing beam 1. The connecting block 44 is slidably connected to a limiting groove 45 that is vertically mounted on the connecting rod 43.

[0048] The length adjustment part 4 also includes a long through groove 46 connecting the top of the extension rod 41 and the limiting groove 42. A slider 47 is provided on one end of the connecting rod 43 near the main nail fixing beam 1. The top of the slider 47 is slidably sleeved inside the long through groove 46.

[0049] A locking screw 48, which is vertically threaded through the slider 47 and the connecting rod 43, is inserted sequentially.

[0050] Before using the intramedullary nail, when it is held at the center line of the locking hole by two clamping blocks 7, the total length between the connecting rod 43 and the extension rod 41 is extended by pulling the connecting rod 43 outward. Then, the locking screw 48 is turned so that its bottom is firmly pressed against the bottom of the limiting groove 42, thereby locking the total length of the connecting rod 43 and the extension rod 41. This allows the clamping blocks 7 to hold the outside of the femur after the intramedullary nail is driven into the femur. This makes the angle change between the rocker arm 2 and the connecting rod 43 close to the change in the curvature of the intramedullary nail. In this way, the position of the locking hole can be positioned more accurately, and the positioning hole 86 on the connecting seat 12 is aligned with the position of the locking hole on the femur. This ensures that the drilling on the femur is within the range of the locking hole and avoids misalignment between the two.

[0051] like Figure 1 , Figure 3 and Figure 4 As shown, the end of the rocker arm 2 away from the support column 5 is hinged to the end of the connecting rod 43 away from the main nail fixing beam 1.

[0052] The intramedullary nail distal locking hole positioning assembly also includes a protractor 3 fixed on the rocker arm 2. The protractor 3 is located at the hinge of the rocker arm 2 and the connecting rod 43. The protractor 3 is used to measure the midline position of the positioning intramedullary nail distal locking hole. This allows for more accurate detection of the curvature change of the intramedullary nail before and after use, so as to more accurately position the locking hole and the opening point on the femur.

[0053] Working principle: Before using the intramedullary nail, the length adjustment unit 4 is stretched, causing the drive unit 8 to drive the two clamping blocks 7 to approach each other and clamp at the midline of the distal locking hole of the intramedullary nail. Since the locking hole of the intramedullary nail is waist-shaped and relatively long, it is clamped at the midline of the locking hole by the clamping blocks 7, and with the crossbeam 6 perpendicular to the rocker arm 2 in the horizontal direction, the distance of the locking hole in the axial direction of the intramedullary nail can be positioned. After the intramedullary nail is used, when repositioning the locking hole, the curvature of the intramedullary nail will be consistent with the curvature of the femur, that is, the curvature of the intramedullary nail will change. Under the premise of keeping the length adjustment unit 4 unchanged from the first adjustment, the deflection angle of the rocker arm 2 can be changed by operating the deflection of the rocker arm 2 and the clamping blocks 7 clamping the femur. Since the moving direction of the clamping block 7 is in the same vertical plane as the axis of the crossbeam 6, and the crossbeam 6 and the rocker arm 2 are perpendicular to each other in the horizontal direction, the change in the deflection angle of the rocker arm 2 can be close to the change in the curvature of the intramedullary nail. Combined with the waist-shaped locking hole design, the final hole positioning error can be less than the general length of the locking hole. Thus, the midpoint between the two clamping blocks 7 can be the hole opening point, which is only slightly off from the center line of the locking hole, but the hole opening point is still within the range of the locking hole. Then, the drill bit of the drilling machine can be passed through the inside of the positioning hole 86 from top to bottom, so as to drill a hole in the femur more accurately, and make the hole in the femur correspond to and connect with the distal locking hole of the intramedullary nail, avoiding circumferential misalignment between the hole in the femur and the locking hole.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0055] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A distal locking hole positioning assembly for an intramedullary nail, comprising a main nail fixing beam (1) and a rocker arm (2), characterized in that, The distal keyhole positioning assembly for the intramedullary nail also includes: A length adjustment part (4) is provided between the rocker arm (2) and the main nail fixing beam (1), and the length adjustment part (4) is used to adjust the distance between the rocker arm (2) and the main nail fixing beam (1); A support column (5) is vertically fixed at the free end of the rocker arm (2); A horizontal beam (6) is fixedly installed on the top of the support column (5), and the horizontal beam (6) is perpendicular to the rocker arm (2) in the horizontal direction; A connecting seat (12) is fixedly installed at one end of the crossbeam (6); Two clamping blocks (7) are respectively disposed on the connecting seat (12); A drive unit (8) is provided on the connecting seat (12), the drive unit (8) is used to drive the two clamping blocks (7) to move closer or further apart along the axial direction of the crossbeam (6).

2. The distal locking hole positioning assembly for intramedullary nails according to claim 1, characterized in that, The distal keyhole positioning assembly for the intramedullary nail also includes: An insertion hole (9) is provided at one end of the main nail fixing beam (1), and a first blocking member (10) is provided inside the insertion hole (9); A second blocking member (11) is provided on the outside of the proximal end of the intramedullary nail. The second blocking member (11) cooperates with the first blocking member (10) and is used to prevent the intramedullary nail from rotating circumferentially.

3. The intramedullary nail distal locking hole positioning assembly according to claim 2, characterized in that, The first blocking member (10) includes at least one guide strip circumferentially disposed on the inner wall of the insertion hole (9).

4. The distal locking hole positioning assembly for intramedullary nails according to claim 3, characterized in that, The second blocking member (11) includes at least one guide groove circumferentially located outside the proximal end of the intramedullary nail.

5. The distal locking hole positioning assembly for intramedullary nails according to claim 1, characterized in that, The length adjustment part (4) includes an extension rod (41) fixedly mounted on the main nail fixing beam (1). A limiting groove (42) is provided transversely inside the extension rod (41). A connecting rod (43) is slidably mounted in the limiting groove (42). A connecting block (44) is fixedly mounted at one end of the limiting groove (42) away from the main nail fixing beam (1). The connecting block (44) is slidably connected to a limiting groove (45) that is vertically mounted on the connecting rod (43).

6. The distal locking hole positioning assembly for intramedullary nails according to claim 5, characterized in that, One end of the rocker arm (2) away from the support column (5) is hinged to the end of the connecting rod (43) away from the main nail fixing beam (1).

7. The distal locking hole positioning assembly for intramedullary nails according to claim 5, characterized in that, The length adjustment part (4) also includes a long through groove (46) connecting the top of the extension rod (41) and the limiting groove (42). A slider (47) is provided on one end of the connecting rod (43) near the main nail fixing beam (1). The top of the slider (47) is slidably sleeved inside the long through groove (46). A locking screw (48) is threaded vertically through the slider (47) and the connecting rod (43).

8. The distal locking hole positioning assembly for intramedullary nails according to claim 6, characterized in that, The intramedullary nail distal keyhole positioning assembly also includes a protractor (3) fixed on the rocker arm (2). The protractor (3) is located at the hinge of the rocker arm (2) and the connecting rod (43). The protractor (3) is used to measure the midline position of the positioning intramedullary nail distal keyhole.

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