Magnetic positioning reduction fixing frame

Abstract

The invention discloses a magnetic positioning reduction fixing frame, and relates to the technical field of medical instruments, the magnetic positioning reduction fixing frame is provided with two fixing rings and six supporting rods, the two ends of each supporting rod are hinged to the two fixing rings respectively, bone needles penetrating through the two broken ends of a fracture are fixed to the two fixing rings through bone needle fixers respectively, the length of the supporting rods can be adjusted, and the supporting rods and the two fixing rings form angles; the supporting rod is composed of an outer sleeve, a sliding rod inserted into the sleeve and a screw partially screwed into the sliding rod, an electric driver is arranged between the sleeve and the sliding rod to drive the supporting rod to stretch out and draw back, sensors are installed on the two fixing rings respectively, and meanwhile a magnetic field generator is arranged near a patient to generate a magnetic field. The sensor transmits the position of the position in the magnetic field to the computer, and the computer controls the electric drivers to stretch out and draw back according to instructions to drive the fracture part to move, so that fracture reduction is completed.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a magnetic positioning and fixation frame. Background Technology

[0002] In recent years, orthopedic fixation devices have developed rapidly, and various fracture reduction and orthopedic devices have emerged in clinical practice. For example, the orthopedic reduction and fixation frame with patent number CN201210547836.4 can perform six actions according to the alignment of the bone fragment ends: compression and lengthening, lateral angulation, anterior-posterior angulation, lateral translation, anterior-posterior translation, and rotation. However, its use requires the use of three-dimensional images from large radiographic instruments such as CT scanners to manually calculate and determine the relative positions of the two fracture fragment ends with the two end rings of the fixation frame. Then, the two end rings of the fixation frame are manually pulled to align and reduce the fracture ends. The alignment accuracy is poor, requiring multiple alignments and multiple CT scans, or operation under continuous CT, which prolongs the operation time and increases the patient's trauma. Summary of the Invention

[0003] The purpose of this invention is to provide a magnetic positioning and reduction fixation frame that can automatically pull the rings at both ends of the fixation frame to align and reduce the fracture end faces, reducing human factors, providing accurate positioning, and eliminating the need for three-dimensional imaging from large radiological instruments such as CT scanners, thus reducing usage costs. It is also simple and convenient to operate, and provides firm and reliable fixation.

[0004] To achieve the above objectives, the present invention provides a magnetic positioning and fixation frame, comprising two fixing rings, designated as ring A and ring B, and six support rods hinged at both ends to rings A and B, respectively. The hinges are ball joints. Bone pin fixators are provided on rings A and B, respectively, to fix bone pins passing through the two ends of the fracture to rings A and B. The length of each support rod is adjustable by sliding and fine-tuning. Each support rod is angularly connected to rings A and B. Each support rod consists of an outer sleeve, a sliding rod inserted into the sleeve, and a screw partially screwed into the sliding rod. One end of the sleeve has an external thread A. The external thread A, in conjunction with a pressure cap A with an internal thread, mounts a first ball joint to the end of the sleeve. A locking nut A is provided on the screw extending from the sliding rod to lock the screw and sliding rod. An external thread B is provided on the end face of the screw extending from the sliding rod. B, through engagement with a threaded cap B, mounts the second ball joint to the end of the screw. Studs are connected to the first and second ball joints respectively. The studs, in conjunction with nuts, mount the first and second ball joints onto rings A and B respectively. An electric actuator is provided between the sleeve and the screw, or between the sleeve and the sliding rod. The electric actuator drives six support rods to extend and retract, causing rings A and B to adjust in extension, angulation, translation, and rotation according to the alignment requirements of the fracture ends. The key feature is that sensors are installed on rings A and B respectively, and a magnetic field generator is placed near the patient. The magnetic field generator generates a magnetic field that covers the sensors. The sensors transmit their position and orientation information within the magnetic field to a computer. The computer controls the extension and retraction of each electric actuator according to the doctor's instructions, thereby causing the fracture site to be retracted, translated, angulated, and rotated, completing the alignment reduction or correction.

[0005] Furthermore, the sleeve surface is provided with a pin hole A, the screw surface is provided with a pin hole B, and an electric actuator is provided between the pin hole A and the pin hole B. The electric actuator has pins at both ends, and when in use, the pins at both ends of the electric actuator are inserted into the pin hole A and the pin hole B respectively.

[0006] Furthermore, the orthopedic procedure involves a computer calculating the daily extension distance of each support rod based on bone growth patterns. The doctor then adjusts the extension length of the screw according to the daily extension distance of each support rod to perform bone orthopedic surgery.

[0007] Furthermore, doctors observe the relative positions of the two fracture surfaces using fluoroscopy and other examination methods, and send specific size, angle, and direction instructions to the computer for retraction, angulation, translation, and rotation. The computer automatically calculates the extension and retraction distance of the six support rods, controls each electric actuator to extend and retract, and drives the fracture site to retract, angulate, translate, and rotate, thereby completing the alignment reduction or correction.

[0008] Furthermore, the other end of the sleeve is equipped with a clamping head that can hold the slide rod in place. A locking nut B is installed at the rear of the clamping head via a threaded connection. The slide rod has an annular anti-slip groove on its surface, and a protruding ridge that mates with the anti-slip groove is located inside the clamping head. The two components prevent the sleeve and the slide rod from sliding relative to each other axially during use.

[0009] Furthermore, the clamping head is tapered and has several openings in the longitudinal direction. Rotating the locking nut B can press the clamping head inward to lock the slide rod axially.

[0010] Furthermore, the bone needle should pass through the two ends of the fractured bone as vertically as possible.

[0011] Furthermore, the positions of ring A and ring B relative to the six support rods and the sensor are fixed. The computer automatically calculates the extension and retraction dimensions of each support rod based on the relative positions of ring A and ring B with the six support rods and the sensor, controls the movement trajectory of ring A and ring B, and drives the bone ends of the fracture to move and reduce the fracture through the bone pin.

[0012] This invention, based on the existing manual stretching and adjustment of fixation frames, adds computer-controlled automatic adjustment and reduction. It can perform six actions according to the alignment needs of the bone fracture ends: compression and lengthening, lateral angulation, anterior-posterior angulation, lateral translation, anterior-posterior translation, and rotation. After repositioning, simply rotate and lock the locking nut on each support rod and remove the electric actuator. It offers accurate positioning, simple operation, and secure and reliable fixation. Any hospital capable of performing fracture fixation surgery can use this product to accelerate fracture healing, reduce patient pain, and the electric actuator can be reused as a medical device, reducing medical costs and facilitating widespread adoption. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a magnetic positioning and fixing frame according to the present invention.

[0014] Explanation of reference numerals in the attached drawings: 1. Ring A; 2. Ring B; 3. Support rod; 4. Bone pin fixator; 5. Bone pin; 6. Electric actuator; 7. Sensor; 8. Magnetic field generator; 31. Sleeve; 32. Slide rod; 33. Screw; 34. Pressure cap A; 35. First ball joint; 36. Locking nut A; 37. Pressure cap B; 38. Second ball joint; 39. Locking nut B. Detailed Implementation

[0015] Figure 1This invention demonstrates an embodiment of a magnetic positioning and reduction fixation frame, which includes two fixing rings, A1 and B2, and six support rods 3, each hinged at both ends to rings A1 and B2. The hinges are ball joints. Bone pin fixators 4 are provided on rings A1 and B2 respectively, fixing bone pins 5 passing through the two ends of the fracture to rings A1 and B2. The length of each support rod 3 is adjustable through sliding and fine-motion. Each support rod 3 is connected to the rings... A1 and ring B2 are both connected at an angle. Each support rod 3 consists of an outer sleeve 31, a sliding rod 32 inserted into the sleeve 31, and a screw 33 partially screwed into the sliding rod 32. One end of the sleeve 31 has an external thread A. The external thread A cooperates with a pressure cap A34 with an internal thread to install the first ball joint 35 at the end of the sleeve 31. A locking nut A36 is provided on the screw 33 extending out of the sliding rod 32 to lock the screw 33 and the sliding rod 32. On the end face of the screw 33 extending out of the sliding rod 32... The device has an external thread B, which engages with a pressure cap B37 with an internal thread to mount a second ball joint 38 onto the end of a screw 33. Studs are connected to the first ball joint 35 and the second ball joint 38, and the studs, in conjunction with nuts, mount the first ball joint 35 and the second ball joint 38 onto rings A1 and B2, respectively. An electric actuator 6 is located between the sleeve 31 and the screw 33. The electric actuator 6 drives six support rods 3 to extend and retract, causing rings A1 and B2 to adjust their extension, angulation, and rotation according to the alignment requirements of the fractured bone ends. The device is characterized by having sensors 7 mounted on rings A1 and B2, and a magnetic field generator 8 placed near the patient. The magnetic field generator 8 generates a magnetic field that covers the sensors 7. The sensors 7 transmit their position and orientation information within the magnetic field to a computer. The computer controls the extension and retraction of each electric actuator 6 according to the doctor's instructions, thereby causing the fractured area to be retracted, translated, angulated, and rotated, completing the alignment reduction or correction.

[0016] Furthermore, the sleeve 31 has a pin hole A on its surface, the screw 33 has a pin hole B on its surface, and an electric actuator 6 is provided between the pin hole A and the pin hole B. The electric actuator 6 has pins at both ends, and when in use, the pins at both ends of the electric actuator 6 are inserted into the pin hole A and the pin hole B respectively.

[0017] Furthermore, the orthopedic procedure involves a computer calculating the daily elongation distance of each support rod 3 based on the bone growth pattern. The doctor then adjusts the extension length of the screw 33 according to the daily elongation distance of each support rod 3 to perform bone orthopedic surgery.

[0018] Furthermore, doctors observe the relative positions of the two fracture surfaces through examination methods such as fluoroscopy, and send specific size, angle, and direction instructions to the computer for retraction, angulation, translation, and rotation. The computer automatically calculates the extension and retraction distance of the six support rods 3, controls each electric actuator 6 to extend and retract, and drives the fracture site to retract, angulate, translate, and rotate, thereby completing the alignment reduction or correction.

[0019] Furthermore, the other end of the sleeve 31 is equipped with a clamping head that can hold the slide rod. A locking nut B39 is installed at the rear of the clamping head via a threaded connection. The slide rod 32 has an annular anti-slip groove 321 on its surface and a protruding ridge that cooperates with the anti-slip groove 321 on the inner side of the clamping head. The two can prevent the sleeve 31 and the slide rod 32 from sliding relative to each other axially during use.

[0020] Furthermore, the clamping head is tapered and has several openings in the longitudinal direction. Rotating the locking nut B39 presses the clamping head inward to lock the slide rod 32 axially.

[0021] Furthermore, the bone needle 5 should pass through the two ends of the fractured bone as vertically as possible.

[0022] Furthermore, the positions of ring A1 and ring B2 relative to the six support rods 3 and the sensor 7 are fixed. The computer automatically calculates the extension and retraction dimensions of each support rod 3 based on the relative positions of ring A1 and ring B2 with the six support rods 3 and the sensor 7, controls the movement trajectory of ring A1 and ring B2, and drives the bone movement and reduction of the fractured ends through the bone pin 5.

Claims

1. A magnetic positioning and reduction fixing frame, comprising two fixing rings, which are respectively ring A (1) and ring B (2), and six support rods (3) respectively hinged at two ends of ring A (1) and ring B (2), ring A (1) and ring B (2) are respectively provided with a bone needle fixing device (4), the bone needle fixing device (4) fixes a bone needle (5) penetrating through two fracture ends on ring A (1) and ring B (2) respectively, the length of each support rod (3) can be adjusted by sliding and micro-motion, each support rod (3) is connected with ring A (1) and ring B (2) at an angle, each support rod (3) is composed of an outer sleeve (31), a sliding rod (32) inserted into the sleeve (31) and a screw rod (33) partially screwed into the sliding rod (32), an electric driver (6) is arranged between the sleeve (31) and the sliding rod (32), the electric driver (6) drives the six support rods (3) to stretch and retract, drives ring A (1) and ring B (2) to adjust the stretching, angle and rotation according to the needs of the bone end alignment, characterized in that, The ring A (1) and ring B (2) are respectively installed with sensors (7), and a magnetic field generator (8) is arranged near the patient, the magnetic field generator (8) generates a magnetic field covering the sensors (7), the sensors (7) transmit the information of the position and direction in the magnetic field to a computer, and the computer controls the extension and retraction of each electric drive (6) according to the instruction issued by the doctor, so as to drive the fracture site to be distracted, translated, angled and rotated, and the reduction or orthopedic is completed.

2. The magnetic positioning and reduction fixture of claim 1, wherein, The other end of the sleeve (31) is provided with a clamping head capable of clamping the slide rod, and a locking nut B (39) is threadedly connected and arranged at the rear of the clamping head, the surface of the slide rod (32) is provided with an annular anti-skid groove (321), and the inside of the clamping head is provided with a convex rib matched with the anti-skid groove (321), so that the sleeve (31) and the slide rod (32) cannot axially slide relative to each other during use.

3. The magnetic positioning and reduction fixture of claim 1, wherein, The surface of the sleeve (31) is provided with a pin hole A, the surface of the screw rod (33) is provided with a pin hole B, and an electric drive (6) is arranged between the pin hole A and the pin hole B, and the two ends of the electric drive (6) are respectively provided with pins, and the pins are respectively inserted into the pin hole A and the pin hole B during use.

4. The magnetic positioning and reduction fixture of claim 1, wherein, The orthopedic is that the computer calculates the extension distance of each support rod (3) per day according to the growth rule of the skeleton, and the doctor adjusts the extension length of the screw rod (33) according to the extension distance of each support rod (3) per day, so as to perform the orthopedic of the skeleton.

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