A positioning guide device for greater trochanter extension osteotomy

Abstract

The present invention belongs to the technical field of medical devices and discloses a greater trochanter extension osteotomy positioning guide device, comprising an arc-shaped guide plate and two femoral clamp assemblies, the guide plate is provided with a guide groove and a sliding groove, the femoral clamp assembly comprises a connecting plate, the connecting plate is connected to a holding rod and two clamping assemblies, the holding rod is connected to an infrared aimer, the clamping assembly comprises a connecting shaft, the connecting shaft is connected to an adjusting nut and a limit block, the adjusting nut is fixedly connected to an arc-shaped clamping claw, the clamping claw is provided with a guide hole, the two clamping assemblies are arranged in a mirror-symmetrical manner about the holding rod, and the two femoral clamp assemblies are arranged in a mirror-symmetrical manner about the guide plate; the present invention utilizes a holding rod to be connected to the adjustable diameter femoral clamp assembly, utilizes a guide groove to assist in osteotomy, the osteotomy operation is simple, the positioning is accurate, the osteotomy is performed at the optimal position, and the probability of fracture of the osteotomy block due to weak bone, movement and non-healing of the osteotomy block, and other adverse conditions is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a greater trochanter lengthening osteotomy positioning guide device. Background Art

[0002] The femur is the largest, long, tubular bone in the human body, consisting of two integral parts: the middle body and the distal ends. The top of the femur is the spherical femur, and the thinner, lower, outer portion of the femoral head is the femoral neck. At the junction of the femoral neck and body, there is an upward protrusion on the outer side called the greater trochanter, also known as the greater trochanter. The smaller protrusion below the greater trochanter is called the lesser trochanter, also known as the lesser trochanter. Intertrochanteric fractures are one of the most common fractures, and artificial hip replacement is one of the treatment options. For example, cemented hip replacement allows for early movement of the affected hip and weight-bearing on the affected side, thus avoiding complications caused by prolonged bed rest.

[0003] During hip revision surgery, the femoral prosthesis often cannot be removed. Trochanteric and femoral osteotomies are sometimes necessary to expand exposure, successfully remove the prosthesis, completely remove bone cement, correct proximal femoral deformity, correctly implant the prosthesis, and adjust the tension of the abductor muscles. Currently, the common method is to split the femur along the longitudinal axis and then remove the femoral prosthesis. The specific method is: after preparing for ETO, the incision is extended to the distal thigh to the distal end of the planned osteotomy segment, the scar tissue on the posterior side of the proximal femur and the femoral insertion of the gluteus maximus are released, and the femur is rotated anteriorly (sole facing upwards); the posterior edge of the vastus lateralis muscle is freed until the femoral shaft is reached, and two Hoffman retractors are used to pull the vastus lateralis muscle anteriorly to expose the posterior aspect of the femur. The length of the osteotomy is determined according to the needs, generally 10 to 15 cm from the tip of the greater trochanter. The osteotomy is performed distally along the posterior edge of the greater trochanter with an oscillating saw until the planned distal end of the osteotomy. The thigh is externally rotated to expose the lateral side of the femur. At the distal end of the planned osteotomy, the bone cortex is transversely cut with a width of about 1 / 3 of the femoral circumference, about 2 to 3 cm wide. The transverse osteotomy is completed with a high-speed drill to form an arc between the longitudinal and transverse osteotomy lines to avoid forming a right angle and prevent stress concentration fractures. After the transverse osteotomy reaches the anterior cortex of the femur, the thigh is further externally rotated to expose the lateral side of the femur. The anterior cortex of the femur is exposed, and a 2-3 cm incision is made proximally from the anterior side so that when the osteotomy block is lifted, the anterior cortical bone breaks along this osteotomy line. Next, several holes are drilled from the posterior osteotomy line to the anterior cortex, all the way to the greater trochanter. Holes can also be drilled anteriorly. Two bone knives are then inserted into the posterior osteotomy line, one at the proximal end and one at the distal end, and the osteotomy block is gently lifted anteriorly, applying even force to prevent it from breaking. After the osteotomy block is lifted, two hooks are placed between the anterior cortex of the femur and the osteotomy block to push the block forward, exposing the femoral medullary cavity. After the operation, the osteotomy block is repositioned and tied with two to three steel wires or titanium cables, one of which is tied 1 to 2 cm proximal to the distal transverse osteotomy line. The proximal wire can be passed through the bone holes of the greater and lesser trochanters for fixation.

[0004] However, currently, the osteotomy fragment is weak and prone to fracture. This is especially true when the greater trochanteric fragment is fixed with steel wire or titanium cable after osteotomy, which can easily lead to nonunion of the trochanteric extension osteotomy and upward migration of the fragment. Furthermore, the current osteotomy position is based on experience and estimation, making it difficult to accurately find the optimal position. If the osteotomy is found to be in an unsatisfactory position, the probability of fracture due to the weak bone of the fragment is increased, and nonunion due to fragment migration is even more serious. Therefore, accurately locating the longitudinal axis of the split has always been a difficult problem to solve. Summary of the Invention

[0005] The present invention provides a positioning and guiding device for greater trochanter extension osteotomy. The device utilizes a gripping rod connected to an adjustable-diameter femoral clamp assembly. A guide plate is attached to the femoral clamp assembly and then secured to the femur. The midpoint of the femur is located using a sight, and the guide plate is adjusted before osteotomy. This device not only securely and stably clamps the femur, providing stability, but also offers simple operation and precise positioning, allowing for optimal osteotomy. This reduces the risk of fracture due to weak bone fragments and the likelihood of undesirable outcomes such as fragment migration and nonunion.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A femoral greater trochanter extension osteotomy positioning guide device comprises a guide plate and a femoral clamp assembly, the guide plate is provided with a guide groove and a sliding groove, the guide groove and the sliding groove are perpendicular to each other, the femoral clamp assembly comprises a connecting plate, the connecting plate is slidably connected to the sliding groove, the connecting plate is connected to a holding rod and a clamping assembly, the holding rod is passed through the guide groove, the clamping assembly comprises a connecting shaft, the clamping assembly is connected to the connecting plate through the connecting shaft, the connecting shaft is threadedly connected with an adjusting nut, the adjusting nut is fixedly connected with a clamping claw, the clamping claw is passed through the connecting shaft, the clamping claw is arc-shaped, the clamping claw is provided with a guide hole, the clamping assembly has two pieces, and the two clamping assemblies are arranged in mirror symmetry with respect to the holding rod.

[0008] Furthermore, the guide plate is an arc-shaped plate.

[0009] Furthermore, the holding rod is connected to the connecting plate via threads, and the connecting shaft is also connected to the connecting plate via threads.

[0010] Furthermore, the femoral clamp assembly has two pieces, and the two femoral clamp assemblies are arranged in mirror symmetry with respect to the guide plate.

[0011] Furthermore, the holding rod is connected to the connecting plate via threads, and the holding rod is connected to a sight.

[0012] Furthermore, the sight is infrared.

[0013] Furthermore, the connecting shaft is also connected to a limit block, and the limit block is used to limit the movement of the adjusting nut.

[0014] The beneficial effects of the technical solution are:

[0015] 1. The femoral clamp assembly with an adjustable diameter is fixedly connected to the femur to achieve a fixed connection to the guide plate. Osteotomy is performed along the guide groove on the guide plate, which is simple to operate and has precise positioning. After osteotomy, the guide hole opened in the clamping claw is used to pass steel wire or titanium cable through the osteotomy to bind and fix the osteotomy, which has a good fixation effect on the osteotomy and reduces the probability of migration and non-union of the osteotomy fragment.

[0016] 2. The arc-shaped positioning plate fits well with the femur, and two femoral clamp assemblies are provided to fix the guide device, which is beneficial to improving the accuracy of the guide. At the same time, infrared sights are provided on the two holding rods. The fixed position of the guide plate is further adjusted according to the two infrared sights, which makes it easier for the operator to find the midpoint of the femur, further improving the positioning accuracy of the device.

[0017] 3. The guide wire device is connected by threads and is detachable as a whole, which is convenient for installation and disassembly. It is convenient to disinfect and sterilize it after each operation to ensure a sterile environment during the operation. A limit block is set on the connecting shaft to limit the movement of the adjusting nut to avoid accidental falling off during the adjustment of the clamping claw and reduce surgical misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a greater trochanter lengthening osteotomy positioning guide device according to the present invention;

[0019] Figure 2 This is a schematic structural diagram of a clamping claw of a greater trochanter lengthening osteotomy positioning guide device according to the present invention;

[0020] Figure 3 This is a structural schematic diagram of a femoral clamp assembly in a closed state in a positioning guide device for greater trochanter extension osteotomy according to the present invention;

[0021] The names of the corresponding symbols in the accompanying drawings are:

[0022] Guide plate 1, guide groove 2, sliding groove 3, connecting plate 4, connecting shaft 5, holding rod 6, limit block 7, clamping claw 8, adjusting nut 9, sight 10, guide hole 11. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0024] like Figures 1 to 3As shown, a positioning guide device for extending the greater trochanter of the femur and performing osteotomy comprises a guide plate 1 and a femoral clamp assembly. The guide plate 1 is an arc-shaped plate. The guide plate 1 is provided with a guide groove 2 and a sliding groove 3. The guide groove 2 and the sliding groove 3 are perpendicular to each other. The femoral clamp assembly comprises a connecting plate 4, which is slidably connected to the sliding groove 3. The connecting plate 4 is connected to a holding rod 6 and a clamping assembly through a threaded connection. The holding rod 6 is connected to a sight 10, which is an infrared sight. The holding rod 6 is passed through the guide groove 2. The clamping assembly comprises a connecting shaft 5. The clamping assembly is threadedly connected to the connecting plate 4 through the connecting shaft 5. The connecting shaft 5 is threadedly connected to the adjusting nut 9. The adjusting nut 9 is fixedly connected to the clamping claw 8. The clamping claw 8 is penetrated by the connecting shaft 5. The clamping claw 8 is arc-shaped and has a guide hole 11. The connecting shaft 5 is also connected to a limit block 7 for limiting the movement of the adjusting nut 9. The clamping assembly has two pieces, and the two clamping assemblies are mirror-symmetrically arranged about the holding rod 6. The femoral clamping assembly has two pieces, and the two femoral clamping assemblies are mirror-symmetrically arranged about the guide plate 1.

[0025] The specific implementation process is as follows:

[0026] When using this guiding and positioning device, the two sets of clamping claws 8 are slid along the sliding groove 3 to fix the guiding device and the femur. During the fixing and clamping process, the holding rod 6 is rotated, and the relative position of the guide plate 1 and the femur is adjusted using the sight 10 to ensure that the guide groove 2 and the center position of the osteotomy coincide with each other. Then, the osteotomy is performed along the guide groove 2. After the osteotomy is completed, the steel wire or titanium cable is passed through the guide hole 11 to fix the osteotomy to prevent the osteotomy block from moving. After the osteotomy is completed, the detachable nature of the guiding device is used to disassemble it and remove it from the surgical area, and disinfect it for next use.

[0027] The above is only an embodiment of the present invention, and common knowledge such as the specific technical solutions or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A positioning guide device for greater trochanter lengthening osteotomy, characterized by: The cam is provided with a guide groove and a sliding groove, the guide groove and the sliding groove are perpendicular to each other, the cam is provided with a connecting plate, the connecting plate is slidably connected to the sliding groove, the connecting plate is connected to the holding rod and the clamping assembly, the holding rod is passed through the guide groove, the clamping assembly includes a connecting shaft, the clamping assembly is connected to the connecting plate through the connecting shaft, the connecting shaft is connected with an adjusting nut by a thread, the adjusting nut is fixedly connected with a clamping claw, the clamping claw is passed through the connecting shaft, the clamping claw is arc-shaped, the clamping claw is provided with a guide hole, the clamping assembly has two pieces, and the two clamping assemblies are arranged in a mirror-symmetrical manner with respect to the holding rod; The holding rod is connected to the connecting plate via a thread, and the connecting shaft is also connected to the connecting plate via a thread; The femoral clamp assembly consists of two parts, and the two femoral clamp assemblies are arranged in mirror symmetry with respect to the guide plate.

2. A greater trochanter lengthening osteotomy positioning guide device according to claim 1, characterized in that: The guide plate is an arc-shaped plate.

3. The greater trochanter lengthening osteotomy positioning guide device according to claim 1, characterized in that: The holding rod is connected to the connecting plate via threads, and the holding rod is connected to a sight.

4. A greater trochanter lengthening osteotomy positioning guide device according to claim 3, characterized in that: The sight is infrared.

5. The greater trochanter lengthening osteotomy positioning guide device according to claim 1, characterized in that: The connecting shaft is further connected to a limit block, and the limit block is used to limit the movement of the adjusting nut.

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