Expansion type back-punching drill bit structure capable of finely adjusting back-punching hole diameter

Abstract

The utility model discloses an expansion type back-beating drill bit structure capable of finely adjusting a back-beating hole diameter. The structure comprises an outer pipe and an adjusting rod arranged in the outer pipe, the top of the outer pipe is provided with elastic piece petals which are symmetrically divided into more than three petals, the outer top ends of the elastic piece petals are provided with cutting heads, the inner surfaces of the elastic piece petals are arc convex surfaces from bottom to top, and the outer surfaces of the elastic piece petals are arc concave surfaces from bottom to top; an adjusting groove is formed in the bottom section of the outer pipe, and an adjusting device which is connected with the bottom of the adjusting rod 2 and can adjust relative movement of the outer pipe and the adjusting rod is arranged on the adjusting groove. And an adjusting head matched with the arc convex surface is arranged at the top end of the adjusting rod. The device is simple in structure and convenient to operate and use, and the reverse punching hole diameter can be adjusted at will.

Description

Technical Field

[0001] The present technology relates to the field of medical devices, and in particular to a drill bit technology capable of finely adjusting the back-drilled hole diameter. Technical Background

[0002] In orthopedic ligament reconstruction surgery, reverse drilling instruments are often used. For example, the most commonly used one is used to make stepped semi-long bone tunnels on the tibial and femoral sides, which are thick inside and thin outside, for passing the graft to reconstruct the ligament. Reconstruction of this part. It is almost impossible to make a semi-long bone tunnel on the tibial side without a reverse drilling. Currently, a reverse drill bit with a reversible drill blade is commonly used. When the drill blade wing is turned sideways in the knee joint cavity, the drill bit can be pulled out from the inside to the outside to form a thick bone tunnel, and then the reversible drill blade is swung out of the drill bit. A stepped bone tunnel with a thick inside and a thin outside is formed. Take the semi-long bone tunnels on the femoral and tibial sides, so that the graft can pass through the fixed femoral side. The femoral side is suspended and fixed with a non-adjustable Endo-Button plate, or the tibial side is still fixed with traditional compression screws. This ACL full-inside reconstruction technology is currently the most mature.

[0003] In 2011, James H. Lubowitz proposed his second-generation ACL all-inside reconstruction technology. He also used the OI method to locate the femoral tunnel positioning point, and used the reversible drill blade wing to reverse the drill to make a stepped semi-long femoral tibial tunnel with thick inside and thin outside. The tibial side positioning point was behind the anteromedial bundle of the ACL, and the semi-long tibial tunnel was made by reverse drilling with the reversible drill wing. The transplanted tendon with adjustable loop plates on both ends was introduced into the femoral and tibial tunnels through the anteromedial approach of the knee arthroscopy, and finally the adjustable loop plates were tightened on both sides for fixation. This ACL all-inside reconstruction technology is currently the most advanced and mature. However, it has the disadvantages that the reverse drilling aperture cannot be adjusted at will, the reversible drill wing is easily stuck by bone debris, and the connection strength between the reversible blade and the drill rod is weak and easy to crack and fall off.

[0004] There are other related prior technologies at present, such as the prior applications named "A Metal Back-drill" with application number "202321394398.2" and "A Bone Grinding Drill" with application number "201920403922.5"; however, these technologies also have the disadvantages that the back-drilled aperture cannot be adjusted at will and are inconvenient to operate and use. Utility Model Content

[0005] The purpose of this technology is to provide a medical device with a simple structure, easy operation and use, and the diameter of the back-drilled hole can be adjusted at will.

[0006] The purpose of the present technology can be achieved through the following technology: an expandable reverse-drill bit structure with fine adjustment of the reverse-drilled hole diameter, wherein the reverse-drill bit structure comprises an outer tube 1 and an adjusting rod 2 arranged in the outer tube 1; the top of the outer tube 1 is provided with a spring petal 10 symmetrically divided into three or more petals, the outer top end of the spring petal 10 is provided with a cutting head 100, the inner surface of the spring petal 10 is an arc convex surface 101 from bottom to top, and the outer surface of the spring petal 10 is an arc concave surface 102 from bottom to top; an adjusting groove 11 is provided at the bottom section of the outer tube 1, and an adjusting device 3 connected to the bottom of the adjusting rod 2 is provided on the adjusting groove 11, which can adjust the relative movement of the outer tube 1 and the adjusting rod; the top end of the adjusting rod 2 is provided with an adjusting head 20 matched with the arc convex surface 101; the bottom end of the outer tube 1 is an electric drill connection end 12.

[0007] Furthermore, adjustment slots 13 are symmetrically provided on the inner walls of the outer tubes on both sides of the adjustment slot 11. The adjustment device 3 is a multi-stage push-type adjustment key, including an adjustment button 30, a hollow adjustment column 31 connected to the adjustment button 30 at one end and connected to the adjustment rod 2 at the other end. A clamping slot 310 for the clamping member 32 to move is provided in the middle of the hollow adjustment column. Clamping teeth 320 cooperating with the adjustment slot 13 are symmetrically provided at both ends of the clamping member 32. A locking rod 33 is provided on the top surface in the middle of the clamping member 32. A clamping spring 34 for pushing the clamping tooth 320 into the adjustment slot 13 is provided on the bottom surface of the clamping member 32. The top end of the locking rod 33 passes through the hollow part of the hollow adjustment column, and its top end 330 is higher than the top surface of the adjusting button 30.

[0008] Furthermore, the outer surface of the outer tube 1 is provided with a depth scale 14 which can measure the depth of the outer tube 1 entering the human body.

[0009] Furthermore, on both sides of the adjusting slot 13 on the outer surface of the outer tube 1 , there are aperture scales 15 for measuring the cutting diameter of the cutting head 100 provided on the outer top end of the spring flap 10 .

[0010] The advancement of this technology lies in its simple structure, easy operation and use, and the ability to adjust the back-punching aperture at will. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0012] Figure 2 It is a partial cross-sectional schematic diagram of the three-dimensional structure of the utility model;

[0013] Figure 3 It is a partial enlarged schematic diagram of A of the present utility model. Specific embodiments

[0014] like Figure 1 , Figure 2 , Figure 3As shown, an expandable reverse-drilling drill bit structure with fine adjustment of reverse-drilling hole diameter comprises an outer tube 1 and an adjusting rod 2 arranged in the outer tube 1; the top of the outer tube 1 is provided with a spring flap 10 which is symmetrically divided into five petals, and the outer top end of the spring flap 10 is provided with a cutting head 100. To facilitate the opening of the spring flap 10, the inner surface of the spring flap 10 is an arc convex surface 101 from bottom to top, and the outer surface of the spring flap 10 is an arc concave surface 102 from bottom to top; the bottom section of the outer tube 1 is provided with an adjusting groove 11, and the adjusting groove 11 is provided with an adjusting device 3 which is connected to the bottom of the adjusting rod 2 and can adjust the relative movement of the outer tube 1 and the adjusting rod. Adjustment slots 13 are symmetrically provided on the inner walls of the outer tubes on both sides of the adjustment slot 11. The adjustment device 3 is a multi-stage push-type adjustment key, including an adjustment button 30, a hollow adjustment column 31 connected to the adjustment button 30 at one end and connected to the adjustment rod 2 at the other end. A clamping slot 310 for a clamping member 32 to move is provided in the middle of the hollow adjustment column. Clamping teeth 320 cooperating with the adjustment slot 13 are symmetrically provided at both ends of the clamping member 32. A locking rod 33 is provided on the top surface in the middle of the clamping member 32. A clamping spring 34 for pushing the clamping tooth 320 into the adjustment slot 13 is provided on the bottom surface of the clamping member 32. The top end of the locking rod 33 passes through the hollow part of the hollow adjustment column, and its top end 330 is higher than the top surface of the adjustment button 30.

[0015] The top end of the adjusting rod 2 is provided with an adjusting head 20 matched with the arc convex surface 101 ; the bottom end of the outer tube 1 is an electric drill connection end 12 .

[0016] The utility model discloses an expansion type reverse drilling bit structure capable of finely adjusting the reverse drilling hole diameter. When drilling a straight hole, the adjusting button 30 is not pushed. At this time, the spring petals 10 are not opened by the adjusting head 20, and the outer diameter of the cutting head 100 arranged at the outer top end of each spring petal 10 is greater than or equal to the diameter of the outer tube 1. When a reverse hole needs to be drilled, the electric drill connection end 12 of the drill bit structure is first fixed to the electric drill, and a straight hole is directly drilled. The outer diameter of the cutting head 100 can also be adjusted to the position where a straight hole is required through the adjusting button 30 according to needs, and then a straight hole is directly drilled. After the positive hole is drilled, according to the required diameter of the reverse hole, the top end 330 of the locking rod 33 is pressed to disengage the tooth 320 of the clamp 32 from the adjusting slot 13, and at the same time, the adjusting button 30 is pushed toward the bottom end of the outer tube 1 to the position of the required hole diameter marked on the aperture scale 15; at this time, the adjusting rod 2 drives the adjusting head 20, and by squeezing the arc convex surface 101, the spring petal 10 protrudes outward, so that the outer diameter of the cutting head 100 arranged at its outer top reaches the aperture marked on the aperture scale 15, and the top end 330 of the locking rod 33 is released. At this time, under the action of the clamp spring 34, the tooth 320 is clamped into the adjusting slot 13, and the outer diameter of the cutting head 100 is maintained, and the motor is directly operated to start the work of drilling the hole. When the required hole depth is reached, the top 330 of the locking rod 33 is pressed, and the adjusting button 30 is pushed toward the top of the outer tube 1, so that the adjusting button 30 returns to the top of the adjusting groove 11, and the adjusting head 20 is disengaged from the arc convex surface 101, and the spring petal 10 returns to its original shape under the action of its own elastic force, and the outer diameter of the cutting head 100 reaches the minimum. At this time, the drill bit structure is pulled out from the drilled hole, and the whole procedure of back-drilling the hole diameter is completed.

Claims

1. An expansion type reverse drilling bit structure capable of finely adjusting the reverse drilling hole diameter, characterized in that: The reverse drilling bit structure comprises an outer tube (1) and an adjusting rod (2) arranged in the outer tube (1); the top of the outer tube (1) is provided with a spring flap (10) symmetrically divided into three or more flaps, the outer top end of the spring flap (10) is provided with a cutting head (100), the inner surface of the spring flap (10) is an arc convex surface (101) from bottom to top, and the outer surface of the spring flap (10) is an arc concave surface (102) from bottom to top; the bottom section of the outer tube (1) is provided with an adjusting groove (11), and the adjusting groove (11) is provided with an adjusting device (3) connected to the bottom of the adjusting rod (2) and capable of adjusting the relative movement of the outer tube (1) and the adjusting rod; the top end of the adjusting rod (2) is provided with an adjusting head (20) matched with the arc convex surface (101); the bottom end of the outer tube (1) is an electric drill connection end (12).

2. The expandable back-drilling drill bit structure with finely adjustable back-drilling hole diameter according to claim 1, characterized in that: Adjustment slots (13) are symmetrically arranged on the inner walls of the outer tubes on both sides of the adjustment slot (11). The adjustment device (3) is a multi-stage push-type adjustment key, comprising an adjustment button (30), a hollow adjustment column (31) connected to the adjustment button (30) at one end and connected to the adjustment rod (2) at the other end. A clamping slot (310) for a clamping member (32) to move is arranged in the middle of the hollow adjustment column. Clamping teeth (320) cooperating with the adjustment slot (13) are symmetrically arranged at both ends of the clamping member (32). A locking rod (33) is arranged on the top surface in the middle of the clamping member (32). A clamping spring (34) for pushing the clamping teeth (320) into the adjustment slot (13) is arranged on the bottom surface of the clamping member (32). The top end of the locking rod (33) passes through the hollow part of the hollow adjustment column, and the top end (330) of the locking rod is higher than the top surface of the adjustment button (30).

3. An expandable reverse drilling bit structure capable of finely adjusting the reverse drilling hole diameter according to claim 1 or 2, characterized in that: The outer surface of the outer tube (1) is provided with a depth scale (14) capable of measuring the depth of the outer tube (1) entering the human body.

4. An expandable reverse drilling bit structure capable of finely adjusting the reverse drilling hole diameter according to claim 1 or 2, characterized in that: On both sides of the adjusting slot (13) on the outer surface of the outer tube (1), there are aperture scales (15) for measuring the diameter of the cutting head (100) provided at the outer top end of the measurable spring flap (10).

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