A depth finder for orthopedic surgery

Abstract

The utility model discloses a kind of depth finder for orthopedics surgery, including sleeve, main rod, end cover, sliding knob, the sleeve is provided with first through-hole along its axial direction, and the one end of sleeve is reading end, and the other end of sleeve is provided with external thread, and U-shaped open slot is provided on sleeve wall along its length direction;The main rod includes thick section and thin section along its axial direction, and a plane is provided on thick section, counterbore and second through-hole are provided on plane near one side of thin section, and scale line and length value are provided on one side of plane away from thin section;The sliding knob is fixedly connected with the thick section of main rod, and spring and steel ball are provided in second through-hole;Main rod is sleeved in sleeve, and the thin section of main rod is stretched out from end cover, and hook is provided at the end of thin section, sliding knob is embedded in U-shaped open slot, the spherical surface of steel ball is in rolling contact with the inner wall of first through-hole, the spherical surface of steel ball simultaneously compresses spring, and sliding knob and main rod are as a whole and can be relatively moved with sleeve along axial direction.

Description

Technical Field

[0001] This utility model specifically relates to a depth measuring device for orthopedic surgery, belonging to the technical field of medical devices for orthopedic surgery. Background Technology

[0002] In clinical practice, internal fixation surgery for fractures typically involves drilling holes in the bone. A bone hole depth gauge or probe is then used to measure the depth of the hole. Based on the measured depth, a screw of appropriate length is selected for fixation. Therefore, accurately measuring the depth of the bone hole is a crucial step. If the measured value is too high, the selected screw may be too long, potentially injuring surrounding muscles, ligaments, or soft tissues. If the measured value is too low, the selected screw may be too short, resulting in insecure plate fixation. Current bone hole depth gauges suffer from low measurement accuracy, require two hands to operate, are inconvenient to use, difficult to disassemble, and difficult to clean and disinfect, necessitating further optimization and improvement. Summary of the Invention

[0003] In view of the problems existing in the prior art, this utility model provides a depth measuring device for orthopedic surgery.

[0004] The technical solution adopted in this utility model is as follows: A depth measuring device for orthopedic surgery includes a cannula, a main rod, an end cap, and a sliding knob. The cannula is hollow and has a first through hole along its axial direction. One end of the cannula is a reading end, and the other end has an external thread. The end cap is detachably connected to the cannula via the external thread. A U-shaped opening groove is provided on the cannula wall along its length, communicating with the first through hole inside, and extending to the external thread end. The main rod includes a thick section and a thin section along its axial direction. The thick section is cylindrical and has a recessed plane along its length. On the side of the thick section near the thin section, there is a feature that is perpendicular to the plane. A vertical and through countersunk hole and a second through hole are provided with scale lines and length values ​​on the side away from the thin section on the plane. The sliding button is fixedly connected to the thick section of the main rod by a screw set in the countersunk hole, and the sliding button blocks one end of the second through hole. A spring and a steel ball are set in the second through hole. The main rod is sleeved in the sleeve, and the thin section of the main rod extends out from the end cap. A hook is provided at the end of the thin section. The sliding button is embedded in the U-shaped opening groove. The spherical surface of the steel ball rolls in contact with the inner wall of the first through hole. At the same time, the spherical surface of the steel ball compresses the spring. The sliding button and the main rod as a whole can move relative to the sleeve along the axial direction.

[0005] Furthermore, the cross-section of the first through hole inside the sleeve reading end is D-shaped.

[0006] Furthermore, a semi-circular opening groove is provided on the tube wall at the reading end of the sleeve, and the semi-circular opening groove communicates with the first through hole inside it.

[0007] Furthermore, the depth sounder also includes a protective sleeve, which is fitted onto the thin section of the main rod, and one end of the protective sleeve is detachably connected to the end cap via a thread.

[0008] Furthermore, the outer surface of the sleeve is provided with rolled straight lines and hand grip grooves.

[0009] Beneficial effects: The orthopedic surgical depth measuring device described in this utility model uses threaded connections for its main components, which facilitates disassembly, cleaning and disinfection. When in use, one hand holds the sleeve, and the thumb pushes the sliding button to allow the main rod to slide freely relative to the sleeve, exposing the scale line. The depth of the bone hole can be measured by reading the scale line. The measurement is accurate and can be operated with one hand, making it convenient to use. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the depth sounder.

[0011] Figure 2 This is the front view of the sleeve.

[0012] Figure 3 for Figure 2 The left view.

[0013] Figure 4 yes Figure 2 A sectional view.

[0014] Figure 5 This is the front view of the main rod.

[0015] Figure 6 yes Figure 5 Side view.

[0016] Figure 7 This is a schematic diagram of the end cap structure.

[0017] Figure 8 This is a schematic diagram of the sleeve structure.

[0018] Markings in the diagram: 1. Sleeve, 2. End cap, 3. Protective sleeve, 4. Main rod, 5. Sliding button, 6. Spring, 7. Steel ball; 11 Reading end, 12 External thread end, 13 U-shaped opening groove, 14 Semi-circular opening groove, 15 Rolled straight knurl, 16 First through hole, 17 Hand grip groove, 111 D-shaped hole; 4 Main rod, 41 Thick section, 42 Thin section, 411 Countersunk hole, 412 Second through hole, 413 Scale line and length value, 414 Plane, 421 Hook. Detailed Implementation

[0019] The present invention will now be described in a clear and complete detail with reference to the accompanying drawings.

[0020] A depth measuring device for orthopedic surgery, the overall assembly structure of which is as follows: Figure 1As shown, from left to right, it includes a sleeve 1, an end cap 2, and a protective sleeve 3. A main rod 4 is fitted inside the sleeve, and a sliding button 5 is fixedly connected to the main rod 4. The main rod can slide left and right relative to the sleeve along the axial direction.

[0021] The structure of the sleeve 1 is as follows: Figure 2 , Figure 3 , Figure 4 As shown. The outer surface of the sleeve 1 is provided with knurled patterns 15 and a hand grip groove 17, which are both anti-slip and easy to hold with one hand. The sleeve 1 has a hollow structure and a first through hole 16 along its axial direction; the left end of the sleeve 1 is the reading end 11, and the right end of the sleeve 1 is the externally threaded end 12. External threads are provided on the externally threaded end 12, and the end cap 2 is detachably connected to the sleeve 1 via the external threads for easy disinfection and cleaning; the first through hole inside the reading end 11 of the sleeve is a D-shaped hole 111, that is, its cross-section is D-shaped (or horseshoe-shaped), and the remaining part of the first through hole 16 has a circular cross-section. A U-shaped opening groove 13 is provided on the outer wall of the sleeve 1 along its length direction. The U-shaped opening groove 13 communicates with the first through hole 16 inside it. The opening of the U-shaped opening groove extends to the right to the externally threaded end 12, and the opening of the U-shaped opening groove does not reach the reading end 11 to the left. A semi-circular opening groove 14 is also provided on the tube wall at the reading end of the sleeve, and the semi-circular opening groove 14 is connected to the D-shaped hole of the first through hole inside it.

[0022] The structure of the main rod 4 is as follows: Figure 5-6 As shown. The main rod 4 includes a thick section 41 and a thin section 42 along its axial direction. The thick section is cylindrical, and its diameter matches the inner diameter of the circular cross-section of the first through hole in the sleeve 1. The thick section 41 can be fitted into the sleeve 1. A recessed plane 414 extending along the length direction is provided on the thick section 41. Two through holes 411, perpendicular to the plane 414, are provided on the side of the plane 414 near the thin section. Two second through holes 412 are provided outside the countersunk holes 411. Scale lines and length values ​​413 are provided on the side of the plane 414 away from the thin section. The thick section of the main rod 4 is fitted inside the sleeve, and the thin section of the main rod extends from the end cap. A hook 421 is provided at the end of the thin section 42. The thick section 41 and the thin section 42 of the main rod 4 can be integrally formed or manufactured separately and then fixedly connected together.

[0023] like Figure 1 As shown, the sliding button 5 is fixedly connected to the thick section 41 of the main rod 4 by a screw set in the countersunk hole 411, and the sliding button 5 blocks one end of the two second through holes 412. A spring 6 and a steel ball 7 are set in each of the second through holes 412.

[0024] During assembly, first, the sliding button 5 and the main rod 4 are fixed together with screws. Then, the thicker section 41 of the main rod 4 is inserted into the sleeve 1, and the sliding button 5 is embedded in the U-shaped opening groove 13. At the same time as insertion, the spring 6 and the steel ball 7 are placed into the second through hole 412, so that the spherical surface of the steel ball 7 rolls in contact with the inner wall of the first through hole 16. The spherical surface of the steel ball 7 compresses the spring 6, so that the sliding button 5 and the main rod 4 can slide relative to the sleeve 1 axially as a whole. At the same time, there is a certain sliding damping force under the action of the spring force, so it will not slide on its own without external force. The flat head with scale on the thicker section of the main rod 4 will pass through the D-shaped hole at the reading end of the sleeve 1. The main rod is restricted in the D-shaped hole and cannot rotate, but can only move axially. At the same time, the sliding button is also restricted in the U-shaped opening groove and cannot rotate. The advantage of the main rod not being able to rotate is that the orientation of its end hook remains unchanged, which makes it easy to hook the leather layer. Next, the end cap 2 is installed via a threaded connection, allowing the thin section 42 of the main rod 4 to pass through it. The end cap 2 is integrated with the sleeve 1, and it seals the U-shaped opening slot 13 to prevent the sliding button 5 from slipping off. Finally, a protective sleeve 3 is fitted onto the thin section 42 of the main rod 4. One end of the protective sleeve 3 is detachably connected to the end cap 2 via a thread. The structure of the end cap 2 is as follows: Figure 7 As shown, the structure of the protective sleeve 3 is as follows: Figure 8 As shown, when not in use, the protective sleeve 3 can protect the thin sections of the main rod.

[0025] The method of using the orthopedic surgical depth measuring device described in this utility model is as follows: The depth measuring device is disinfected before use. During surgery, after drilling a hole in the bone, when it is necessary to measure the hole depth, the protective sleeve 3 is removed beforehand to expose the thin section 42 of the main rod. The tube 1 of the depth measuring device is held with one hand, and the thumb presses down on the sliding button 5. Pushing the sliding button 5 causes the main rod 4 to slide relative to the tube 1, maximizing the extension of the thin section 42. Then, the thin section 42 of the main rod is inserted into the bone hole, and the hook 421 of the thin section hooks onto the cortical layer opposite the bone hole. Then, the sliding button 5 is pushed in the opposite direction so that the end cap 2 connected to the tube 1 abuts against the cortical layer on the front side of the bone hole. At this point, the scale value of the thick section 41 of the main rod exposed at the reading end 11 of the tube is read. This scale reading is the depth of the bone hole. Furthermore, the semi-circular opening groove 14 on the tube wall at the reading end of the tube facilitates the observation of the scale value. Therefore, this depth measuring device is very suitable for doctors to operate with one hand to measure hole depth, and it is both accurate and convenient to use during surgery.

Claims

1. A depth measuring device for orthopedic surgery, characterized in that, The system includes a sleeve, a main rod, an end cap, and a sliding button. The sleeve is hollow and has a first through hole along its axial direction. One end of the sleeve is a reading end, and the other end has an external thread. The end cap is detachably connected to the sleeve via the external thread. A U-shaped opening groove is provided on the sleeve wall along its length, communicating with the first through hole inside. The U-shaped opening groove extends to the external thread end. The main rod includes a thick section and a thin section along its axial direction. The thick section is cylindrical and has a recessed plane along its length. On the side of the thick section near the thin section, a perpendicular and penetrating surface is provided. The countersunk hole and the second through hole have scale lines and length values ​​on the side away from the thin section on the plane. The sliding button is fixedly connected to the thick section of the main rod by a screw set in the countersunk hole, and the sliding button blocks one end of the second through hole. A spring and a steel ball are set in the second through hole. The main rod is sleeved in the sleeve, and the thin section of the main rod extends out from the end cap. A hook is set at the end of the thin section. The sliding button is embedded in the U-shaped opening groove. The spherical surface of the steel ball rolls in contact with the inner wall of the first through hole. At the same time, the spherical surface of the steel ball compresses the spring. The sliding button and the main rod as a whole can move relative to the sleeve along the axial direction.

2. The depth measuring device for orthopedic surgery according to claim 1, characterized in that, The cross-section of the first through hole inside the sleeve reading end is D-shaped.

3. The depth measuring device for orthopedic surgery according to claim 1, characterized in that, A semi-circular opening groove is also provided on the tube wall at the reading end of the sleeve, and the semi-circular opening groove communicates with the first through hole inside it.

4. The depth measuring device for orthopedic surgery according to claim 1, characterized in that, The depth sounder also includes a protective sleeve, which is fitted onto a thin section of the main rod. One end of the protective sleeve is detachably connected to an end cap via a thread.

5. A depth measuring device for orthopedic surgery according to claim 1, characterized in that, The outer surface of the sleeve is provided with rolled straight lines and hand grip grooves.

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