Bone holder for femoral subtrochanteric osteotomy

Abstract

The invention discloses a bone holder for femoral subtrochanteric osteotomy, which comprises a clamping mechanism and a guide mechanism, and is characterized in that the clamping mechanism comprises a measuring side rod, sliding sleeves slidably mounted at the two ends of the measuring side rod, adjusting knobs rotatably mounted at one ends of the sliding sleeves, and connecting rods arranged at the side ends of the sliding sleeves; the fixing clamp is mounted at the tail end of the connecting rod; the guide mechanism comprises a connecting mechanism detachably connected to the measuring side rod, a placement block arranged at the side end of the connecting mechanism, a plurality of guide grooves formed in the placement block at equal intervals, and cutting tools clamped in the guide grooves. After a bone block is cut off, two smooth anastomosis surfaces at the broken ends can be provided, so that fracture healing is facilitated, and postoperative recovery is accelerated; and secondly, by stably clamping the wounded femur and limiting the femur in a single direction, the rotation that the broken ends of the cut femur get close to each other during splicing can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a bone holder used for subtrochanteric osteotomy of the femur. Background Art

[0002] Subtrochanteric osteotomy has a wide range of indications. This study is about the application of this osteotomy in total hip replacement for grade IV DDH to avoid excessive extension of the lower limb, which may lead to damage to the sciatic nerve and blood vessels and difficulty in reduction. Subtrochanteric osteotomy methods include horizontal osteotomy, oblique osteotomy, wedge osteotomy, Z-shaped osteotomy, etc. Horizontal osteotomy is currently the most commonly used in clinical practice. During osteotomy, the assistant uses two ordinary bone clamps to clamp the femur while the surgeon performs osteotomy. During osteotomy, due to the swing of the saw blade, it is difficult for the assistant to keep the bone clamps and the clamped femur in a fixed position, so the cut surface is often uneven. After the bone block is removed, the two broken ends are not well matched when spliced ​​together, which is not conducive to fracture healing and thus affects the effect of the operation. For this reason, a tool is needed to assist in cutting. Therefore, this article proposes a bone holder for subtrochanteric osteotomy. Summary of the Invention

[0003] The purpose of the present invention is to design a bone holder for subtrochanteric osteotomy to solve the problems in the background technology.

[0004] To achieve the above technical effects, the present invention is implemented through the following technical solutions: a bone holder for subtrochanteric osteotomy, comprising a clamping mechanism and a guide mechanism, characterized in that: the clamping mechanism comprises a measuring side rod, a sliding sleeve slidably mounted at both ends of the measuring side rod, an adjustment knob rotatably mounted at one end of the sliding sleeve, a connecting rod disposed at a side end of the sliding sleeve, and a fixed clamp mounted at the end of the connecting rod; the guide mechanism comprises a connecting mechanism detachably connected to the measuring side rod, a placement block disposed at a side end of the connecting mechanism, a plurality of guide grooves equidistantly disposed on the placement block, and a cutting tool engaged within the guide grooves;

[0005] The measuring side rod is a threaded rod, and fixed surfaces are provided in parallel on the front and rear sides of the measuring side rod. The left outer wall of the measuring side rod is provided with a plane with a scale, and the other outer wall of the measuring side rod is provided with a guide groove.

[0006] Furthermore, the connecting mechanism includes a U-shaped card clamped on the fixed surfaces on both sides, a bolt hole arranged at the side end of the U-shaped card, a screw sleeve installed outside the bolt hole, a locking screw threadedly connected to the inside of the screw sleeve, and an adjusting disk arranged at one end of the locking screw.

[0007] Furthermore, an internal thread is provided inside the adjusting knob; the internal thread is meshed and connected with the external thread of the threaded rod; and a clamping block adapted to the guide groove is provided inside the sliding sleeve.

[0008] Furthermore, the connecting rod includes an arc rod fixedly installed on the side end of the sliding sleeve, a straight rod arranged at the end of the arc rod, an arc adjustment plate installed at the rear end of the straight rod, and jacks equidistantly arranged on the arc adjustment plate.

[0009] Furthermore, the fixing clamp includes a connecting plate arranged at the end of the straight rod, rotating holes symmetrically arranged on both sides of the connecting plate, a clamping plate rotatably installed inside the rotating hole, an adjusting rod rotatably installed at the side end of one clamping plate, a limiting hole arranged at the end of the adjusting rod, a limiting pin movably sleeved inside the limiting hole, a stopper arranged in the middle of the limiting pin, and a limiting spring connecting the stopper and the adjusting rod; the lower end of the adjusting rod is adapted to the jack.

[0010] Furthermore, one end of the splint is provided with meshing teeth, the inner side of the other end of the splint is provided with an arc groove, and the interior of the arc groove is provided with tooth-shaped protrusions; after the two splints are installed, the meshing teeth provided at one end of the splint cooperate with each other.

[0011] Furthermore, an extension plate is provided on the upper side of the splint at the upper end of the measuring side rod; and an extension plate is provided on the lower side of the splint at the lower end of the measuring side rod.

[0012] Furthermore, a smooth coating is provided on the inner wall of the guide groove.

[0013] The beneficial effects of the present invention are:

[0014] The present invention has a simple structure and is easy to use. By providing a measuring side rod and position-adjustable clamping mechanisms at both ends of the measuring side rod, an auxiliary osteotomy area is formed between the two clamping mechanisms. The doctor performs SSO osteotomy in the auxiliary osteotomy area and, in conjunction with the provided guide mechanism, guides the cutting tool by inserting it into the guide groove to prevent the cutting tool from deviating left or right during the cutting process. This reduces the difficulty of osteotomy and improves the efficiency and success rate of osteotomy.

[0015] The present invention provides two mutually parallel clamping mechanisms, so that the two osteotomy sections formed on the femur are parallel to each other and the positions do not shift. When connecting, the sections do not need to be remodeled and can be directly anastomosed, resulting in a good osteotomy surface healing effect in the later stage.

[0016] The present invention provides an adjustment knob, a guide groove, and a scale, so that the installed sliding sleeve can move up and down under the limit of the guide groove without rotating, thereby assisting in anastomosis of the two osteotomy sections of the femur. During the anastomosis process, no internal rotation or external rotation occurs, and the two osteotomy sections after anastomosis fit together perfectly, further ensuring the success rate of the operation.

[0017] The present invention sets a scale so that medical personnel can use the scale lines on the measuring side rod to accurately adjust the distance between the two bone-holding mechanisms, so that the length of the auxiliary osteotomy area formed is consistent with the length designed before surgery. The traditional method that requires doctors to measure manually is abandoned, so that the osteotomy length is highly accurate and the error is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure of another aspect of the present invention;

[0021] Figure 3 It is a front view of the present invention;

[0022] Figure 4 It is a rear view of the present invention;

[0023] Figure 5 It is a side view of the present invention;

[0024] Figure 6 This invention Figure 5 A in the middle is an enlarged structural diagram;

[0025] Figure 7 It is a top view of the present invention;

[0026] Figure 8 This invention Figure 7 The enlarged structural diagram at B in the middle;

[0027] Figure 9 It is a schematic diagram of the internal structure of the adjustment knob of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Measuring side rod; 11. Fixing surface; 12. Scale; 13. Guide groove; 2. Sliding sleeve; 21. Clamp; 3. Adjusting knob; 4. Connecting rod; 41. Arc rod; 42. Straight rod; 43. Arc adjustment plate; 44. Socket; 5. Fixing clamp; 51. Connecting plate; 52. Rotating hole; 53. Clamp; 531. Engaging teeth; 532. Arc groove; 533. Tooth-like protrusion; 534. Extension plate; 54. Adjusting rod; 55. Limiting hole; 56. Limiting pin; 57. Stop block; 58. Limiting spring; 6. Connecting mechanism; 61. U-shaped clamp; 62. Bolt hole; 63. Locking screw; 64. Adjusting disk; 7. Placement block; 8. Guide groove. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Example 1

[0032] See Figures 1 to 9 As shown, a bone holder for subtrochanteric osteotomy includes a clamping mechanism and a guiding mechanism, and is characterized in that:

[0033] The clamping mechanism includes a measuring side rod 1, a sliding sleeve 2 slidably mounted at both ends of the measuring side rod 1, an adjustment knob 3 rotatably mounted at one end of the sliding sleeve 2, a connecting rod 4 disposed at the side end of the sliding sleeve 2, and a fixing clamp 5 mounted at the end of the connecting rod 4; the guiding mechanism includes a connecting mechanism 6 detachably connected to the measuring side rod 1, a placement block 7 disposed at the side end of the connecting mechanism 6, a plurality of guide grooves 8 equidistantly disposed on the placement block 7, and a cutting tool engaged within the guide groove 8;

[0034] The measuring side rod 1 is a threaded rod, and a fixing surface 11 is provided in parallel on the front and rear sides of the measuring side rod 1. A plane is provided on the left outer wall of the measuring side rod 1, and a scale 12 is provided on the plane. A guide groove 13 is provided on the other outer wall of the measuring side rod 1.

[0035] The connecting mechanism 6 includes a U-shaped card 61 clamped on the fixed surfaces 11 on both sides, a bolt hole 62 set at the side end of the U-shaped card 61, a screw sleeve installed on the outside of the bolt hole 62, a locking screw 63 threadedly connected to the inside of the screw sleeve, and an adjusting disk 64 set at one end of the locking screw 63.

[0036] The adjusting knob 3 is provided with an internal thread; the internal thread is engaged with the external thread of the threaded rod; the sliding sleeve 2 is provided with a clamping block 21 adapted to the guide groove 13.

[0037] The connecting rod 4 includes an arc rod 41 fixedly mounted on the side end of the sliding sleeve 2, a straight rod 42 arranged at the end of the arc rod 41, an arc adjustment plate 43 installed at the rear end of the straight rod 42, and jacks 44 equidistantly arranged on the arc adjustment plate 43.

[0038] The fixing clamp 5 includes a connecting plate 51 arranged at the end of the straight rod 42, rotating holes 52 symmetrically arranged on both sides of the connecting plate 51, a clamping plate 53 rotatably installed inside the rotating hole 52, an adjusting rod 54 rotatably installed on the side end of the clamping plate 53 on one side, a limiting hole 55 arranged at the end of the adjusting rod 54, a limiting pin 56 movably sleeved inside the limiting hole 55, a stopper 57 arranged in the middle of the limiting pin 56, and a limiting spring 58 connecting the stopper 57 and the adjusting rod 54; the lower end of the adjusting rod 54 is adapted to the socket 44.

[0039] One end of the clamping plate 53 is provided with meshing teeth 531, and the inner side of the other end of the clamping plate 53 is provided with an arc groove 532, and the inner side of the arc groove 532 is provided with a tooth-shaped protrusion 533; after the two clamping plates 53 are installed, the meshing teeth 531 provided at one end of the clamping plates cooperate with each other.

[0040] An extension plate 534 is provided on the upper side of the clamping plate 53 at the upper end of the measuring side rod 1 ; an extension plate 534 is provided on the lower side of the clamping plate 53 at the lower end of the measuring side rod 1 .

[0041] A smooth coating is provided on the inner wall of the guide groove 8. The smooth coating can be made of a non-toxic and harmless coating material so that when cutting, the saw blade is close to the smooth coating and cuts, reducing the friction force suffered by the saw blade.

[0042] Example 2

[0043] Specific steps for using this device in subtrochanteric osteotomy:

[0044] 1. The general steps of subtrochanteric osteotomy are as follows:

[0045] 1) Incision and exposure: Make an extended posterolateral hip incision, cut the skin and subcutaneous tissue, and cut the fascia lata along the skin incision to expose the posterior edge of the hip joint and the vastus lateralis muscle. Split the muscle longitudinally to reach the femur, cut the periosteum longitudinally, and peel it from the periosteum to expose the subtrochanteric area of ​​the femur.

[0046] 2) Horizontal osteotomy is performed 2-3 cm below the inferior edge of the lesser trochanter. The length of the horizontal bone block to be removed is measured with a ruler, and a straight line is drawn along the longitudinal axis of the femur with an electric knife. The assistant uses two ordinary bone clamps to clamp the femur. The surgeon performs horizontal osteotomy and, after removing the bone block, ties steel wire about 1 cm away from each end, and uses bone clamps to sew the ends together along the drawn straight line. Then, the next step of medullary expansion and femoral stem prosthesis placement is performed.

[0047] 2. Apply this device to the "two ordinary bone clamps clamp the femur, and the surgeon performs horizontal osteotomy" in 2), as follows:

[0048] Before performing surgical cutting, the device is placed close to the femur, and the adjusting knob 3 is rotated to adjust the distance between the two fixing clamps 5 so that they can clamp the two ends of the femur that need to be cut off, which is generally 1 to 5 cm. The medical staff can freely adjust the adjusting knob 3. When the required distance is reached, the position of the placement block 7 is adjusted so that the guide groove 8 on the placement block 7 is collinear with the line drawn along the longitudinal axis of the femur with the electric knife (by inserting the cutting tool into the guide groove 8 for comparison). If they are not collinear, the locking screw is operated to adjust the position of the placement block 7 until the guide groove 8 is collinear with the line drawn along the longitudinal axis of the femur with the electric knife, and then the two fixing clamps 5 are operated in turn. During the operation, the two splints 53 are formed into a suitable clamping angle by operating the adjusting rod 54, and then the two splints 53 are placed on both sides of the femur, and the adjusting rod 54 is operated to make the two The block splint 53 is closed to stably fix the fixing clamp 3 on the femur. Before fixing, it is necessary to observe the fixing position (insert the cutting tool into the guide groove 8 for comparison). When the guide groove 8 on the placement block 7 is collinear with a straight line drawn along the longitudinal axis of the femur with the electric knife, the cutting tool (saw blade) can enter along the guide groove 8 to cut the femur at the marked position. If it is not satisfied, fine-tune it by turning the adjusting knob 3. When the cutting position is reached, fix it. At this time, the two fixing clamps 5 form a C-shaped stable structure with the measuring side rod, so the cut surface after cutting is smooth and flat, and the cutting surfaces of the upper and lower ends are perfectly matched, and the length of the femur is accurately cut off. After the osteotomy is completed, the adjusting knob 3 at the lower end is operated to rotate. At this time, the fixing clamp 5 at the lower end moves upward along the measuring side rod 1 close to the fixing clamp 5 above.

[0049] Finally, in the present invention, the number of fixing clips 5 can be increased according to demand. It is not limited to the two fixing clips 5 shown in the drawings, but can be three, four, and so on.

[0050] In addition, during medullary expansion, the surgeon's assistant cannot use two bone clamps to splice the two broken ends together and fix them without forming an angle. With the clamping of the present invention, there is no need to wire the femur at the proximal and distal ends of the osteotomy surface in the traditional way to expand the medullary bone.

[0051] Moreover, in the prior art, due to micro-movement of the femoral stump during medullary expansion, the expanded medullary cavity is eccentric, and the femoral stump is displaced laterally or anteriorly after the prosthesis is installed, which also affects the healing of the fracture ends. Although under the existing circumstances, rotation of the femoral stump during splicing can be avoided by drawing lines with an electric knife, it is difficult to control the fracture ends. Therefore, after medullary expansion and the installation of the prosthesis, the distal and proximal ends of the fracture ends often rotate, affecting the surgery and the muscle mechanics of the lower limbs. With the present invention, there is no eccentricity during medullary expansion after fixation, and the femoral stumps are anastomosed without displacement.

Claims

1. A bone holder for subtrochanteric osteotomy, comprising a clamping mechanism and a guiding mechanism, characterized in that: The clamping mechanism includes a measuring side rod, a sliding sleeve slidably mounted at both ends of the measuring side rod, an adjustment knob rotatably mounted at one end of the sliding sleeve, a connecting rod disposed at a side end of the sliding sleeve, and a fixed clamp mounted at the end of the connecting rod; the guide mechanism includes a connecting mechanism detachably connected to the measuring side rod, a placement block disposed at a side end of the connecting mechanism, a plurality of guide grooves equidistantly disposed on the placement block, and a cutting tool engaged within the guide grooves; The measuring side rod is a threaded rod, and fixed surfaces are provided in parallel on the front and rear sides of the measuring side rod. The left outer wall of the measuring side rod is provided with a plane with a scale, and the other outer wall of the measuring side rod is provided with a guide groove.

2. A bone holder for subtrochanteric osteotomy according to claim 1, characterized in that: The connecting mechanism includes a U-shaped card clamped on the fixed surfaces on both sides, a bolt hole set at the side end of the U-shaped card, a screw sleeve installed outside the bolt hole, a locking screw threadedly connected to the inside of the screw sleeve, and an adjusting disk set at one end of the locking screw.

3. The bone holder for subtrochanteric osteotomy according to claim 1, characterized in that: An internal thread is provided inside the adjusting knob; the internal thread is meshed and connected with the external thread of the threaded rod; and a clamping block adapted to the guide groove is provided inside the sliding sleeve.

4. The bone holder for subtrochanteric osteotomy according to claim 1, characterized in that: The connecting rod includes an arc rod fixedly mounted on the side end of the sliding sleeve, a straight rod arranged at the end of the arc rod, an arc adjustment plate installed at the rear end of the straight rod, and jacks arranged on the arc adjustment plate with equal distances.

5. The bone holder for subtrochanteric osteotomy according to claim 1, characterized in that: The fixing clamp includes a connecting plate arranged at the end of the straight rod, rotating holes symmetrically arranged on both sides of the connecting plate, a clamping plate rotatably installed inside the rotating hole, an adjusting rod rotatably installed at the side end of one clamping plate, a limiting hole arranged at the end of the adjusting rod, a limiting pin movably sleeved inside the limiting hole, a stopper arranged in the middle of the limiting pin, and a limiting spring connecting the stopper and the adjusting rod; the lower end of the adjusting rod is adapted to the jack.

6. The bone holder for subtrochanteric osteotomy according to claim 5, characterized in that: One end of the splint is provided with meshing teeth, the inner side of the other end of the splint is provided with an arc groove, and the interior of the arc groove is provided with tooth-shaped protrusions; after the two splints are installed, the meshing teeth provided at one end of the splint cooperate with each other.

7. The bone holder for subtrochanteric osteotomy according to claim 1, characterized in that: An extension plate is provided on the upper side of the splint at the upper end of the measuring side rod; and an extension plate is provided on the lower side of the splint at the lower end of the measuring side rod.

8. The bone holder for subtrochanteric osteotomy according to claim 1, characterized in that: A smooth coating is provided on the inner wall of the guide groove.

Images