Micro-motion type lengthening device

Abstract

This utility model discloses a micro-motion extension device, relating to the field of medical device technology. It includes an upper ring seat, with a lower ring seat below it. Sliding sleeves are slidably mounted on both the upper and lower ring seats. A fixing bolt is threaded onto each sliding sleeve, and a steel needle is provided on the sliding sleeve. A connecting mechanism is provided between the upper and lower ring seats. The connecting mechanism includes a sliding sleeve mounted on the lower ring seat, a threaded seat movably mounted inside the sliding sleeve, and a connecting screw mounted on the threaded seat, with its upper end connected to the upper ring seat. A driving mechanism is provided on the sliding sleeve. A rotating connecting seat is located below the upper ring seat. A threaded groove is formed on the threaded seat, and a movable hole is formed below the threaded groove. This micro-motion extension device, through the coordinated use of the connecting mechanism and the driving mechanism, can smoothly and quickly reconnect fractured leg bones, aiding in rapid leg bone repair.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a micro-motion extension device. Background Technology

[0002] External fixation devices for the leg are external support devices used for fracture fixation or limb orthopedics, suitable for cases such as open fractures, severe comminuted fractures, bone infections, or deformity correction. They consist of steel pins, connecting rods, an upper ring seat, and a lower ring seat, connected to an external frame via steel pins that penetrate the bone, providing stable mechanical support. Compared to internal fixation surgery, external fixation devices offer advantages such as being minimally invasive, adjustable postoperatively, and easier to care for wounds, making them particularly suitable for complex fractures accompanied by soft tissue injury or infection.

[0003] During fracture treatment, medical staff can bring the upper and lower ring seats closer together by rotating the connecting rod. When these two components are close together, the fractured leg bone receives corresponding traction, allowing the broken bones to approach and eventually connect. This method of fracture treatment demands a high level of professional skill and experience from the surgeon. The surgeon must be able to accurately adjust the distance between the upper and lower ring seats according to the specific situation and severity of the fracture to ensure proper alignment and healing. This surgical method is relatively complex, requiring the surgeon to possess advanced technique and extensive clinical experience. Furthermore, in the later stages of fixation, the ideal fixation method is to switch from rigid fixation to dynamic fixation; the current fixation method is rigid fixation. Therefore, a micro-motion extension device is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a micro-motion extension device to solve the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a micro-motion extension device, including an upper ring seat, a lower ring seat below the upper ring seat, and sliding sleeves slidably mounted on both the upper and lower ring seats. A fixing bolt is threaded onto the sliding sleeve, and a steel needle is provided on the sliding sleeve. A connecting mechanism is provided between the upper and lower ring seats. The connecting mechanism includes a sliding sleeve mounted on the lower ring seat, a threaded seat movably mounted inside the sliding sleeve, a connecting screw mounted on the threaded seat, and the upper end of the connecting screw connected to the upper ring seat. A driving mechanism is provided on the sliding sleeve.

[0006] Preferably, a rotary connecting seat is provided below the upper ring seat, a threaded groove is provided on the threaded seat, a movable hole is provided below the threaded groove, a bearing seat is fixedly installed inside the sliding sleeve, and an installation groove is provided at the lower edge of the sliding sleeve.

[0007] Preferably, the bottom of the lower ring seat is provided with a micro-motion mechanism, and the sliding sleeve is installed on the lower ring seat through the micro-motion mechanism. The micro-motion mechanism includes a lower connecting rod connected to the lower ring seat, a nut on the lower connecting rod, an upper connecting rod above the lower connecting rod, a ball head between the upper connecting rod and the lower connecting rod, a sliding cylinder fixedly installed on the upper connecting rod, a spring inside the sliding cylinder, a threaded sleeve threaded on the sliding cylinder, and a slider movably installed inside the sliding cylinder, with the slider fixed to the bottom of the sliding sleeve.

[0008] Preferably, the connecting screw is installed on the threaded seat through a threaded groove, the upper end of the connecting screw is rotatably installed below the ball head on the upper ring seat through a rotating connecting seat, the connecting screw is slidably installed on the sliding sleeve through the threaded seat, and the sliding sleeve is fixedly installed on the upper ring seat by a fixing bolt.

[0009] Preferably, the driving mechanism includes a drive screw rotatably mounted in a bearing housing, a screw slider on the drive screw and fixedly mounted on the bottom of the threaded seat, a worm gear fixedly mounted at the lower end of the drive screw, a worm rotatably mounted on one side of the worm gear, a drive shaft fixedly mounted on the worm, a handwheel at the end of the drive shaft, and a planetary reducer between the handwheel and the drive shaft.

[0010] Preferably, the bearing housing contains a bearing, and the drive screw is rotatably mounted in the bearing housing via the bearing.

[0011] Preferably, the worm gear is rotatably mounted in the mounting groove via a drive screw, and the worm gear meshes with the worm. The drive screw extends into the threaded seat through a movable hole. One end of the drive shaft is fixedly mounted on the worm, and the other end of the drive shaft is fixedly mounted on the output end of the planetary reducer. The end of the handwheel is provided with a coupling, and the output end of the planetary reducer is fixedly mounted to the end of the handwheel via the coupling.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this application, after the upper and lower ring seats are fitted onto the patient's lower leg, the distance between them is adjusted by rotating the connecting screw to achieve adaptability of the external fixator to different patient lower leg sizes. Subsequently, steel pins are implanted into the patient's leg bone, and the fixing bolts are tightened to ensure stable fixation of the steel pins in the patient's leg bone, ultimately achieving fixation of the upper and lower ring seats on both sides of the fracture site.

[0014] 2. In this application, after rotating the handwheel, its end will drive a planetary reducer, which slows down the drive shaft, causing it to rotate slowly. Subsequently, the slow rotation of the drive shaft will cause the worm gear to rotate, which in turn drives the lead screw to rotate slowly. During the slow rotation of the lead screw, the lead screw slider will achieve a slow and smooth downward movement. As the lead screw slider moves slowly and smoothly downward, the upper and lower ring seats will slowly approach each other, allowing the fractured leg bones to approach and align, maintaining a fixed state to promote rapid fracture healing. This process effectively reduces the difficulty of the surgery.

[0015] 3. In this application, after the threaded sleeve is loosened, the spring is released, allowing the slider to slide freely within the sliding cylinder, thus enabling minute displacement between the upper and lower ring seats. During the later stages of the fixing phase, the system switches from rigid fixing to dynamic fixing, allowing for slight movement along the core mechanical axis. Simultaneously, tightening the nut causes the lower connecting rod to move downwards, locking the ball head and the ball sleeve together. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the connection mechanism of this utility model;

[0019] Figure 4 This is a schematic diagram of the drive mechanism of this utility model;

[0020] Figure 5 This is a schematic diagram of the micro-motion mechanism of this utility model.

[0021] The diagram is labeled as follows: 1. Upper ring seat; 2. Lower ring seat; 3. Fixing bolt; 4. Sliding sleeve; 5. Steel needle; 6. Connecting mechanism; 601. Rotary connecting seat; 602. Connecting screw; 603. Sliding sleeve; 604. Threaded seat; 605. Threaded groove; 606. Movable hole; 607. Bearing seat; 608. Mounting groove; 7. Drive mechanism; 701. Drive screw; 702. Screw slider; 703. Worm gear; 704. Worm; 705. Planetary reducer; 706. Handwheel; 707. Drive shaft; 8. Micro-motion mechanism; 801. Slider; 802. Threaded sleeve; 803. Spring; 804. Sliding cylinder; 805. Upper connecting rod; 806. Ball head; 807. Lower connecting rod; 808. Nut; 809. Ball head locking sleeve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1 and Figure 2 As shown, this utility model provides a technical solution for a micro-motion extension device, including an upper ring seat 1, a lower ring seat 2 below the upper ring seat 1, a sliding sleeve 4 slidably mounted on both the upper ring seat 1 and the lower ring seat 2, a fixing bolt 3 threaded onto the sliding sleeve 4, a steel needle 5 on the sliding sleeve 4, a connecting mechanism 6 between the upper ring seat 1 and the lower ring seat 2, and a driving mechanism 7 on the sliding sleeve 603. Through the cooperation of the connecting mechanism 6 and the driving mechanism 7, the fractured leg bones can be smoothly and quickly joined together, helping the leg bones to repair quickly.

[0024] like Figure 2 and Figure 3 As shown, the connecting mechanism 6 includes a sliding sleeve 603 mounted on the lower ring seat 2. A threaded seat 604 is movably mounted inside the sliding sleeve 603. A connecting screw 602 is mounted on the threaded seat 604, and the upper end of the connecting screw 602 is connected to the upper ring seat 1. A rotating connecting seat 601 is provided below the upper ring seat 1. A threaded groove 605 is opened on the threaded seat 604, and a movable hole 606 is opened below the threaded groove 605. A bearing seat 607 is fixedly mounted inside the sliding sleeve 603. An installation groove 608 is provided at the lower edge of the sliding sleeve 603. A micro-motion mechanism 8 is provided at the bottom of the lower ring seat 2, and the sliding sleeve 603 is mounted on the lower ring seat 2 through the micro-motion mechanism 8.

[0025] Specifically, in use, the upper ring 1 and lower ring 2 need to be fitted onto the patient's lower leg. The distance between the upper ring 1 and lower ring 2 can be flexibly adjusted using the connecting screw 602. This design allows the external fixator to adapt to different patient lower leg sizes and shapes, ensuring the device's versatility and applicability. Once adjusted to the appropriate position, the next step is to accurately fix the steel pin 5 in the appropriate position on the patient's leg bone. Once the steel pin 5 is correctly fixed, the fixing bolt 3 can be tightened to ensure that the upper ring 1 and lower ring 2 are firmly fixed to both sides of the fractured leg bone. Through these steps, the external fixator can stabilize the fracture site, providing the patient with necessary support and stability, thereby promoting the fracture healing process.

[0026] like Figure 2 and Figure 4As shown, the drive mechanism 7 includes a drive screw 701 rotatably mounted in a bearing housing 607, a screw slider 702 on the drive screw 701, and the screw slider 702 fixedly mounted on the bottom of the threaded seat 604. A worm gear 703 is fixedly mounted at the lower end of the drive screw 701, a worm 704 is rotatably mounted on one side of the worm gear 703, a drive shaft 707 is fixedly mounted on the worm 704, a handwheel 706 is provided at the end of the drive shaft 707, a planetary reducer 705 is provided between the handwheel 706 and the drive shaft 707, a bearing is provided in the bearing housing 607, and the drive screw 701 is rotatably mounted in the bearing housing 607 through the bearing.

[0027] Specifically, when the handwheel 706 is rotated, it begins to drive the output end of the planetary reducer 705 to rotate. Through the deceleration effect of the planetary reducer 705, the drive shaft 707 rotates at a slow and stable speed. As the drive shaft 707 rotates slowly, it further drives the worm gear 704 to rotate at a slow rhythm. The slow rotation of the worm gear 704, in turn, causes the lead screw 701 to rotate slowly and smoothly. During the slow rotation of the lead screw 701, it drives the lead screw slider 702 to move downwards in a very smooth and stable motion. The slow and smooth downward movement of the lead screw slider 702 causes the upper ring seat 1 and the lower ring seat 2 to gradually approach each other, allowing the fractured leg bones to come closer together and align. This aligning action maintains the fixation of the fracture site, provides necessary support for the fractured leg bones, and thus helps the fractured leg bones to heal quickly.

[0028] like Figure 2 and Figure 5 As shown, the micro-motion mechanism 8 includes a lower connecting rod 807 connected to the lower ring seat 2, a nut 808 on the lower connecting rod 807, an upper connecting rod 805 above the lower connecting rod 807, a ball head 806 between the upper connecting rod 805 and the lower connecting rod 807, a sliding cylinder 804 fixedly installed on the upper connecting rod 805, a spring 803 inside the sliding cylinder 804, a threaded sleeve 802 threadedly installed on the sliding cylinder 804, a slider 801 movably installed inside the sliding cylinder 804, and the slider 801 fixed to the bottom of the sliding sleeve 603, and a ball head locking sleeve 809 connected to the ball head 806.

[0029] Specifically, after the threaded sleeve 802 is loosened, the spring 803 will be released. After the spring 803 is released, the slider 801 can slide inside the sliding cylinder 804, allowing slight movement between the upper ring seat 1 and the lower ring seat 2. In the later stage of the fixing phase, the rigid fixing is switched to dynamic fixing, that is, it can move slightly along the main mechanical axis. At the same time, after tightening the nut 808, the lower connecting rod 807 will move downward, so that the ball head 806 and the ball sleeve are locked.

[0030] Working principle: When in use, first put the upper ring seat 1 and the lower ring seat 2 on the patient's lower leg. After the upper ring seat 1 and the lower ring seat 2 are put on the patient's lower leg, the connecting screw 602 can be rotated to adjust the distance between the upper ring seat 1 and the lower ring seat 2 so that the external fixation bracket can be adapted to the lower legs of different patients. Then, the steel needle 5 can be fixed to the patient's leg bone. After the steel needle 5 is fixed to the patient's leg bone, the fixing bolt 3 can be tightened so that the upper ring seat 1 and the lower ring seat 2 are fixed to both sides of the fractured leg bone respectively. After the upper ring seat 1 and lower ring seat 2 are fixed to both sides of the fractured leg bone, the handwheel 706 can be rotated. Rotating the handwheel 706 will drive the output end of the planetary reducer 705 to rotate. After being reduced by the planetary reducer 705, the drive shaft 707 will rotate slowly. After the drive shaft 707 rotates slowly, it will drive the worm gear 704 to rotate slowly. After the worm gear 704 rotates slowly, it will drive the drive screw 701 to rotate slowly. During the slow rotation of the drive screw 701, it will drive the screw slider 702 to move slowly and steadily downward. When the screw slider 702 moves slowly and steadily downward, it will drive the upper ring seat 1 and lower ring seat 2 to slowly approach each other, so that the fractured leg bones are brought closer together, and the fractured leg bones are joined together and fixed, which helps the fractured leg bones to repair quickly.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A micro-motion extension device, comprising an upper ring seat (1), a lower ring seat (2) below the upper ring seat (1), and sliding sleeves (4) slidably mounted on both the upper ring seat (1) and the lower ring seat (2), wherein a fixing bolt (3) is threaded onto the sliding sleeve (4), and a steel needle (5) is provided on the sliding sleeve (4), characterized in that: A connecting mechanism (6) is provided between the upper ring seat (1) and the lower ring seat (2). The connecting mechanism (6) includes a sliding sleeve (603) installed on the lower ring seat (2). A threaded seat (604) is movably installed inside the sliding sleeve (603). A connecting screw (602) is installed on the threaded seat (604), and the upper end of the connecting screw (602) is connected to the upper ring seat (1). A driving mechanism (7) is provided on the sliding sleeve (603).

2. The ratcheting extension device of claim 1, wherein: A rotating connecting seat (601) is provided below the upper ring seat (1), a threaded groove (605) is provided on the threaded seat (604), a movable hole (606) is provided below the threaded groove (605), a bearing seat (607) is fixedly installed inside the sliding sleeve (603), and an installation groove (608) is provided at the lower edge of the sliding sleeve (603).

3. The ratcheting extension device of claim 2, wherein: The lower ring seat (2) is provided with a micro-motion mechanism (8) at its bottom. The sliding sleeve (603) is installed on the lower ring seat (2) through the micro-motion mechanism (8). The micro-motion mechanism (8) includes a lower connecting rod (807) connected to the lower ring seat (2). A nut (808) is provided on the lower connecting rod (807). An upper connecting rod (805) is provided above the lower connecting rod (807). A connection is provided between the upper connecting rod (805) and the lower connecting rod (807). A ball head (806) is provided. A sliding cylinder (804) is fixedly installed on the upper connecting rod (805). A spring (803) is provided inside the sliding cylinder (804). A threaded sleeve (802) is threadedly installed on the sliding cylinder (804). A slider (801) is movably installed inside the sliding cylinder (804), and the slider (801) is fixed to the bottom of the sliding sleeve (603). A ball head locking sleeve (809) is connected to the ball head (806).

4. The ratcheting extension device of claim 3, wherein: The connecting screw (602) is installed on the threaded seat (604) through the threaded groove (605). The upper end of the connecting screw (602) is rotatably installed below the ball head (806) on the upper ring seat (1) through the rotating connecting seat (601). The connecting screw (602) is slidably installed on the sliding sleeve (603) through the threaded seat (604). The sliding sleeve (4) is fixedly installed on the upper ring seat (1) by the fixing bolt (3).

5. The micro-motion extension device according to claim 4, characterized in that: The drive mechanism (7) includes a drive screw (701) rotatably mounted in a bearing housing (607), a screw slider (702) on the drive screw (701), and the screw slider (702) fixedly mounted on the bottom of a threaded seat (604). A worm gear (703) is fixedly mounted at the lower end of the drive screw (701), and a worm (704) is rotatably mounted on one side of the worm gear (703). A drive shaft (707) is fixedly mounted on the worm (704), and a handwheel (706) is provided at the end of the drive shaft (707). A planetary reducer (705) is provided between the handwheel (706) and the drive shaft (707).

6. The ratcheting extension device of claim 5, wherein: The bearing housing (607) is provided with a bearing, and the drive screw (701) is rotatably mounted in the bearing housing (607) through the bearing.

7. The micro-motion extension device according to claim 6, characterized in that: The worm gear (703) is rotatably mounted in the mounting groove (608) via the drive screw (701), and the worm gear (703) meshes with the worm (704). The drive screw (701) extends into the threaded seat (604) through the movable hole (606). One end of the drive shaft (707) is fixedly mounted on the worm (704), and the other end of the drive shaft (707) is fixedly mounted on the output end of the planetary reducer (705). The end of the handwheel (706) is provided with a coupling, and the output end of the planetary reducer (705) is fixedly mounted on the end of the handwheel (706) via the coupling.

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