A Kirschner wire guide based on patella thickness

Abstract

The invention provides a Kirschner wire guide based on patella thickness, comprising a caliper, a fixed plate, and a Kirschner wire guide part, the caliper comprising an upper handle, a lower handle, an upper card, and a lower card, a compression spring is arranged between the parallel upper handle and the lower handle, the upper handle and the upper card are connected by an inner connecting rod, the lower handle and the lower card are connected by an outer connecting rod, the outer connecting rod is sleeved on the outer side of the inner connecting rod, a scale capable of displaying the thickness of the patella is arranged between the inner connecting rod and the outer connecting rod, a fixed plate for fixing on the dorsal side of the patella is installed on the upper card, the side of the fixed plate close to the patella is an arc surface, a threaded column and a nut are arranged on the dorsal side of the fixed plate, the Kirschner wire guide part comprises a longitudinal extension rod, a rearward extension rod, and a positioning sleeve, and a positioning hole for the Kirschner wire to pass through is arranged on the positioning sleeve. The needle is accurately positioned, and it is convenient to fix and pressurize, so as to avoid cutting the patellar ligament or quadriceps tendon during surgery to find the needle tip and increase damage.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a Kirschner wire guide based on patella thickness. Background Art

[0002] Tension band fixation is a common surgical procedure for treating patellar fractures. Usually, the Kirschner wire is drilled into one side through the patellar fracture surface, and then the Kirschner wire is reversed and drilled into the other side. First, the Kirschner wire may tilt medially or laterally, resulting in a poor position or the two Kirschner wires cannot be parallel, affecting the compression effect; second, the front-back tilt may damage the patellar cartilage or the cortex on one side may be too thin and fixation may fail; third, the Kirschner wire exit point is uncertain, and the patellar ligament or quadriceps tendon may need to be cut during surgery to find the needle tip, which may increase the damage. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a Kirschner wire guide based on the thickness of the patella. The technical solution adopted is that it includes a caliper, a fixed plate, and a Kirschner wire guide. The caliper includes an upper handle and a lower handle located at the top and an upper card and a lower card located at the bottom. A compression spring is arranged between the parallel upper handle and the lower handle. The upper handle and the upper card are connected by an inner connecting rod, and the lower handle and the lower card are connected by an outer connecting rod. The outer connecting rod is sleeved on the outer side of the inner connecting rod. A scale capable of displaying the thickness of the patella is arranged between the inner connecting rod and the outer connecting rod. The above card is equipped with a fixing plate for fixing on the dorsal side of the patella, the side of the fixing plate close to the patella is an arc-shaped surface, and a threaded column and a nut are provided on the dorsal side of the fixing plate. The Kirschner wire guide part includes a longitudinal extension rod, a rearward extension rod, and a positioning sleeve. The longitudinal extension rod is provided with a through hole for sleeved on the threaded column of the fixing plate and a mounting groove for connecting the rearward extension rod. One end of the rearward extension rod is fixed in the mounting groove, and the other end is connected to the positioning sleeve. The positioning sleeve is provided with a positioning hole for the Kirschner wire to pass through, and the axis of the positioning hole is parallel to the longitudinal extension rod, and the rearward extension rod is provided with a scale.

[0004] Preferably, a fixing buckle is hinged on the upper handle or the lower handle for locking the pressurized upper and lower handles together.

[0005] Preferably, the cross section of the outer connecting rod is a rectangle with an opening.

[0006] Preferably, a card slot for the upper card to enter is provided on the back side of the fixed disk, a fixing plate is provided above the card slot, a fixing bolt for tightening the upper card is provided on the fixing plate, and the threaded column is located on one side of the card slot.

[0007] Preferably, a mounting frame is fixed to the end of the rearward extension rod, and two positioning sleeves are fixed on the mounting frame.

[0008] Preferably, the longitudinal extension rod and the rear extension rod, the mounting frame and the positioning sleeve are fixed respectively by means of buckles, and the buckle includes a bottom surface with a tightening screw and two hollow side surfaces perpendicular to the bottom surface, and the hollow structure on the side surfaces is for the rear extension rod and the positioning sleeve to pass through.

[0009] Beneficial effects of the present invention: In the present invention, through the cooperation of the caliper, the fixing plate and the Kirschner wire guide, the Kirschner wire can be inserted into the middle position of the thickness of the patella, the needle withdrawal position is accurate, and it is convenient to fix and pressurize, avoiding the increase of damage caused by cutting the patellar ligament or quadriceps tendon to find the needle tip during the operation, reducing the pain suffered by the patient during the operation, and improving the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of a Kirschner wire guide based on patella thickness of the present invention;

[0011] Figure 2 is a schematic diagram of the structure of the caliper;

[0012] Figure 3 Schematic diagram of the structure of the inner connecting rod and the outer connecting rod;

[0013] Figure 4 It is a structural schematic diagram of a fixed disk;

[0014] Figure 5 is a top view of the fixed plate;

[0015] Figure 6 is a schematic diagram of the structure of the Kirschner wire guide;

[0016] Figure 7 It is a structural schematic diagram of the longitudinal extension rod;

[0017] Figure 8 It is a schematic diagram of the connection between the rearward extension rod and the positioning sleeve;

[0018] Fig. 9 is the main view of the buckle;

[0019] Fig.10 is a side view of the buckle;

[0020] Fig.11 It is a bottom view of the buckle;

[0021] In the figure: 1-caliper, 11-upper handle, 12-lower handle, 13-upper card, 14-lower card, 15-inner connecting rod, 16-outer connecting rod, 17-compression spring, 18-fixing buckle, 2-fixing plate, 21-threaded column, 22-slot, 23-fixing plate, 3-Kirschner wire guide, 30-Kirschner wire, 31-longitudinal extension rod, 32-rearward extension rod, 33-positioning sleeve, 34-mounting frame, 35-buckle. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is described in detail below through specific embodiments.

[0023] like Figures 1 to 11 As shown, the Kirschner wire guide based on patella thickness of the present invention comprises a caliper 1, a fixed plate 2, and a Kirschner wire guide 3. The caliper 1 comprises a parallel upper handle 11, a lower handle 12, and an upper card 13 and a lower card 14 located at the bottom. A compression spring 17 is provided between the upper handle 11 and the lower handle 12. The upper handle 11 and the upper card 13 are connected by an inner connecting rod 15. The lower handle 12 and the lower card 14 are connected by an outer connecting rod 16. The outer connecting rod 16 is sleeved on the outer side of the inner connecting rod 15. A scale capable of displaying the thickness of the patella is provided between the inner connecting rod 15 and the outer connecting rod 16. A fixed plate 2 for fixing on the dorsal side of the patella is installed on the upper card 13. The side of the fixed plate 2 close to the patella is an arc surface. A threaded column 21 and a nut are provided on the dorsal side of the fixed plate 2. The Kirschner wire guide portion 3 includes a longitudinal extension rod 31, a rearward extension rod 32, and a positioning sleeve 33. The longitudinal extension rod 31 is provided with a through hole for being sleeved on the threaded column 21 of the fixed plate 2 and a mounting groove for connecting the rearward extension rod 32. One end of the rearward extension rod 32 is fixed in the mounting groove, and the other end is connected to the positioning sleeve 33. The positioning sleeve 33 is provided with a positioning hole for the Kirschner wire to pass through, and the axis of the positioning hole is parallel to the longitudinal extension rod 31.

[0024] In this embodiment, a handle is provided at the proximal end of the caliper 1, which is in the shape of a handle and is 10 cm long. The upper and lower handles are designed to be parallel, with a distance of 3 cm between the upper and lower handles. The compression spring between the upper and lower handles can be pressed close to each other and can rebound when released. A fixed tooth buckle 18 is hinged at the rear end of the lower handle 12. The fixed tooth buckle 18 can rotate and move, and after pressure is applied, it can be locked by buckling the fixed tooth buckle 18 on the rear end of the upper handle 11.

[0025] The outer connecting rod 16 and the inner connecting rod 15 are 10 cm long. The center of the outer connecting rod 15 is a rectangular hole for the inner connecting rod 15 to be placed and slide up and down, and one side is open for easy cleaning. The near section of the inner connecting rod 15 has a scale, the top is 0, and the scale when the handle is fully tightened is the patella thickness.

[0026] Upper card 13, lower card 14, thick 2mm, wide 4mm, long 50mm, both spacing 3cm. Upper card 13 is connected with the fixing plate 2 of patella back side.

[0027] The fixing plate 2 is circular, and a slot 22 with a depth of 2 mm and a width of 5 mm is provided in the center of the back side thereof for the upper card 13 of the caliper to enter. A fixing plate 23 with a width of 10 mm and a length of 20 mm is also provided on the back side of the fixing plate 2, spanning the slot, and a fixing bolt is provided at the center above the fixing plate 23. A threaded column 21 is provided on one side of the slot 22 for the longitudinal extension rod 31 to be sleeved and fixed by a nut.

[0028] The longitudinal extension rod 31 is a rectangular parallelepiped with a length of 8 cm, a width of 1 cm, and a height of 1 cm. The proximal 2 cm is solid. The through hole at the head end can be sleeved on the threaded column on the back side of the disc, and can be rotated arbitrarily. It can be fixed by applying a nut at a specific angle. The installation groove of the far section 6 cm is a dovetail groove structure for the rear extension rod 32 to enter, and is connected and fixed by a buckle 35.

[0029] The rear extension rod 32 is a solid rectangular parallelepiped with a length of 3 cm, a width of 0.8 cm, and a height of 0.8 cm, with scales on the top and the end connected to the mounting frame 34.

[0030] The mounting frame 34 is a hollow structure with three sides of 6 cm long, 1 cm wide and 1 cm high, and the solid side is integrally fixedly connected with the rear extension rod 32. The positioning sleeve 33 is a rectangular parallelepiped with a length of 2 cm, a width of 0.8 cm and a thickness of 0.8 cm, and a positioning hole with a diameter of 2.2 mm in the center for the Kirschner wire to pass through. The two positioning sleeves 33 and the mounting frame 34 are connected by buckles 35.

[0031] Buckle 35 has a solid bottom surface and comes with a tightening screw for tightening and fixing; the two side surfaces perpendicular to the bottom surface are 1.2 cm apart, the side surfaces are hollowed out, and the inner diameter is 1.0 cm, which can allow the rear extension rod and the positioning sleeve to pass through.

[0032] The steps are as follows:

[0033] A longitudinal incision is made in the center of the front of the patella to expose the fracture site and explore the damage of the joint capsule. Generally, the joint cavity is explored from the inside, rinsed, and debris is removed. The joint cavity is reset under direct vision and fixed with a reset clamp. First, the upper card 13 is inserted into the slot 22 on the back of the fixing plate 2 on the dorsal side of the patella, and it is not tightened temporarily. The lower card 14 is inserted through the medial joint capsule crack, which is generally located in the center of the upper and lower diameters of the patella. Adjust the fixing plate 2 to the center of the dorsal side of the patella, tighten the upper and lower handles, and fix it with a fixing tooth button 18. Tighten the fixing bolt on the dorsal fixing plate 23 of the fixing plate to fix the upper card 13. Install the longitudinal extension rod 31, and after adjusting it to make it perpendicular to the direction of the patellar fracture line, tighten the nut on the threaded column 21 to fix it. Install the rearward extension rod 32, and adjust the locating hole on the locating sleeve 33 according to the scale adjustment at the handle so that the locating hole is located at the center of the patellar thickness. Adjust the locating sleeve 33 left and right according to the patellar width. If the patellar width is small, only one locating sleeve 33 can be used. Tighten the buckle 35 and insert the Kirschner wire through the positioning sleeve 33 to complete the process.

[0034] Although the specific embodiments of the present invention are described in detail above, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention, and modifications or deformations without creative labor are still within the protection scope of the present invention.

Claims

1. A Kirschner wire guide based on patella thickness, characterized in that: The invention comprises a caliper, a fixing plate and a Kirschner wire guide part. The caliper comprises an upper handle and a lower handle at the top and an upper card and a lower card at the bottom. A compression spring is arranged between the parallel upper handle and the lower handle. The upper handle and the upper card are connected by an inner connecting rod. The lower handle and the lower card are connected by an outer connecting rod. The outer connecting rod is sleeved on the outer side of the inner connecting rod. A scale capable of displaying the thickness of the patella is arranged between the inner connecting rod and the outer connecting rod. A fixing plate for fixing on the dorsal side of the patella is installed on the upper card. The side of the fixing plate close to the patella is an arc-shaped surface. A threaded column and a nut are arranged on the dorsal side of the fixing plate. The Kirschner wire guide part comprises a longitudinal extension rod, a rearward extension rod and a back extension rod. Extension rod, positioning sleeve, the longitudinal extension rod is provided with a through hole for being sleeved on the threaded column of the fixed disk and a mounting groove for connecting the rear extension rod. The longitudinal extension rod is in the shape of a rectangular parallelepiped, with a length of 8 cm, a width of 1 cm and a height of 1 cm. The through hole at the head end can be sleeved on the threaded column on the back side of the disc and can be rotated arbitrarily. It is fixed with a nut under pressure at a specific angle. The 6 cm mounting groove at the far end is a dovetail groove structure for the rear extension rod to enter. One end of the rear extension rod is fixed in the mounting groove, and the other end is connected to the positioning sleeve. The positioning sleeve is provided with a positioning hole for the Kirschner wire to pass through. The axis of the positioning hole is parallel to the longitudinal extension rod, and a scale is provided on the rear extension rod.

2. The Kirschner wire guide based on patella thickness according to claim 1, characterized in that: A fixing buckle is hinged on the upper handle or the lower handle and is used to lock the pressurized upper and lower handles together.

3. The Kirschner wire guide based on patella thickness according to claim 1, characterized in that: The cross section of the outer connecting rod is a rectangle with an opening.

4. The Kirschner wire guide based on patella thickness according to claim 1, characterized in that: A card slot for the upper card to enter is arranged on the back side of the fixed plate, a fixing plate is arranged above the card slot, a fixing bolt for tightening the upper card is arranged on the fixing plate, and the threaded column is located at one side of the card slot.

5. The Kirschner wire guide based on patella thickness according to claim 1, characterized in that: A mounting frame is fixed to the end of the rearward extension rod, and two positioning sleeves are fixed on the mounting frame.

6. The Kirschner wire guide based on patella thickness according to claim 5, characterized in that: The longitudinal extension rod and the rear extension rod, the mounting frame and the positioning sleeve are fixed respectively by buckles. The buckle includes a bottom surface with a tightening screw and two hollow side surfaces perpendicular to the bottom surface. The hollow structure on the side surface is for the rear extension rod and the positioning sleeve to pass through.

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