A wrist joint k-wire insertion guide

Abstract

The application discloses a wrist joint Kirschner wire inserting guide, and belongs to the technical field of medical devices. The device comprises an arc-shaped base, both sides of the base are connected with fixed bands provided with anti-skid pads, an operation window is formed in the front part, the inner wall of the window is provided with a guide sliding groove consistent with the arc of the base, a moving plate block with a through groove and an engaging hole is slidably connected in the sliding groove, a guide base with a guide hole is hingedly connected in the through groove; a gear meshing with the engaging hole is arranged at the rear part of the arc-shaped base, a connecting hole is coaxially formed and a regulating wheel connected with the gear is arranged through the connecting hole, and an annular air cushion is fixed at the inner side of the front end. The application can realize accurate adjustment of needle insertion in two dimensions, prevent displacement by cooperating with a double fixing structure, significantly improve the needle insertion precision, reduce surgical complications, is simple to operate, and shortens the operation time.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a Kirschner wire insertion guide for wrist joints. Background Technology

[0002] Wrist fractures are common orthopedic injuries, and Kirschner wire fixation is a common treatment method. Currently, clinical practice often employs freehand insertion, which heavily relies on the surgeon's experience and feel. This method suffers from low insertion accuracy and large angle deviations, easily leading to serious complications such as poor fracture reduction, Kirschner wire penetration into the joint cavity, or damage to surrounding nerves and blood vessels. Furthermore, freehand insertion often requires repeated punctures and adjustments, significantly increasing patient discomfort and surgical time, and also raising the risk of infection at the surgical site.

[0003] Existing Kirschner wire guide devices suffer from structural complexity and inconvenient adjustment, making it difficult to flexibly and accurately adjust the circumferential and pitch angles of the needle insertion. This makes them unsuitable for different patients' wrist anatomy and complex fracture types. Furthermore, the fixation method is limited, and displacement is prone to occur during surgery, directly affecting the needle insertion accuracy and failing to meet the needs of precise minimally invasive surgery in clinical practice. Summary of the Invention

[0004] This invention addresses the aforementioned shortcomings of existing technologies, aiming to solve the core technical problems of low precision and uncontrollable angles in manual needle insertion, the inability of existing guiding devices to simultaneously achieve continuous and precise adjustment of the circumferential and pitch angles of needle insertion, and the simplistic fixation methods that easily lead to displacement during surgery. It achieves dual stability through a combination of an arc-shaped base and initial fixation with a strap, and pressure fixation with a ring-shaped air cushion. Continuous adjustment of the circumferential angle of needle insertion is achieved through a movable plate that can slide along an arc-shaped trajectory, and continuous adjustment of the pitch angle of needle insertion is achieved through a swingable guiding base.

[0005] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows:

[0006] A Kirschner wire insertion guide for wrist joint includes an arc-shaped base, with fixing straps connected to the left and right sides of the arc-shaped base respectively. The fixing straps are used to initially bind and fix the device to the patient's forearm, and the inner surface of the fixing straps is provided with an anti-slip pad.

[0007] The front of the arc-shaped base has an operation window. The front and rear inner walls of the operation window are provided with guide grooves that match the curvature of the arc-shaped base. A movable plate is slidably engaged through the guide grooves. A through groove is vertically provided on the movable plate. A guide base is hinged inside the through groove. The guide base can swing back and forth to adjust the pitch angle of the needle. Locking bolts and baffles are provided on both sides of the movable plate on the guide base. The locking bolts are used to lock and fix the guide base after the angle is adjusted. The baffles are engraved with angle scales to visually display the swing angle of the guide base.

[0008] The guide base has a vertically formed guide hole in the middle, and a guide thread tube is threaded into the guide hole. The guide thread tube is used to provide a precise puncture guide channel for the Kirschner wire.

[0009] The rear of the arc-shaped base is provided with a gear, and the rear end of the movable plate is provided with a meshing hole that meshes with the gear. The gear and the meshing hole cooperate to convert the rotation of the adjusting wheel into the linear sliding of the movable plate. The arc-shaped base is provided with a connecting hole coaxial with the gear. A limiting ring is provided on the top periphery of the connecting hole. An adjusting wheel is coaxially sleeved inside the limiting ring. The adjusting wheel is coaxially connected with the gear and is used to drive the gear to rotate to adjust the position of the movable plate.

[0010] The adjusting wheel has symmetrical slots, and a movable block is provided in the slot. A spring is provided between the movable block and the adjusting wheel. The inner surfaces of the movable block and the limiting ring are both serrated, and the two can be engaged. The spring is used to push the movable block to maintain the engagement state with the limiting ring, so as to realize the automatic locking of the adjusting wheel.

[0011] An annular air cushion is fixed to the inner side of the front end of the arc-shaped base. After the annular air cushion is inflated, it can apply pressure to fix the patient's wrist. Multiple expansion knots are distributed around the annular air cushion. After the expansion knots are inflated, they can fit against the wrist skin at multiple points to enhance the fixation effect. The annular air cushion is connected to a storage air bladder through a conduit. The storage air bladder is used to store gas and inflate the annular air cushion.

[0012] Furthermore, arc-shaped fitting blocks are fixed on the front and rear sides of the through groove. The curvature of the fitting blocks matches the curvature of the top end of the guide base, which is used to limit the axial movement of the guide base on the hinge axis and improve its swing stability.

[0013] Furthermore, the guide threaded tube has a hollow channel inside for the Kirschner needle to pass through, and the guide threaded tube has a variety of different inner diameter specifications to adapt to Kirschner needles of different diameters commonly used in clinical practice.

[0014] Furthermore, the conduit between the storage airbag and the annular air cushion is equipped with a valve to control the airflow, which is used to control the inflation and deflation process of the annular air cushion.

[0015] The beneficial effects of this invention are:

[0016] 1. This invention adapts the arc-shaped base to the natural anatomical curvature of the human wrist, and achieves dual stability fixation by combining the initial fixation with the fixation strap and the pressure fixation with the annular air cushion, thus fixing the device to the arm and improving the needle insertion accuracy; the expansion knot on the annular air cushion can be evenly attached to the wrist skin at multiple points after inflation, enhancing the fixation effect.

[0017] 2. This invention uses the meshing transmission of gears and meshing holes to drive the moving plate to slide smoothly along the guide groove in the circumferential direction, thereby achieving continuous and precise adjustment of the needle insertion circumferential angle; the guide base with hinged connection can flexibly adjust the needle insertion pitch angle, and the adjustment value can be intuitively displayed with the angle scale on the baffle. The two-dimensional angle adjustment is independent of each other and the operation is simple.

[0018] 3. This invention guides the Kirschner wire puncture through a guide threaded tube. The guide threaded tube is equipped with various inner diameter specifications to adapt to Kirschner wires of different diameters commonly used in clinical practice. Furthermore, the guide threaded tube and the guide hole are connected by threads, making replacement convenient.

[0019] 4. This invention uses a press-type self-locking mechanism composed of an adjusting wheel, a movable block, a spring, and a limiting ring to achieve rapid locking and unlocking of the moving plate. After adjustment, it can be automatically locked to ensure the stability and safety of the surgical procedure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments are briefly introduced below.

[0021] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the disassembled structure of Embodiment 1 of the present invention;

[0023] Figure 3 yes Figure 2 Enlarged diagram of part A in the middle;

[0024] Figure 4 This is a schematic diagram of the adjusting wheel structure in Embodiment 1 of the present invention;

[0025] Figure 5 This is a partial cross-sectional view of Embodiment 1 of the present invention.

[0026] The structural names represented by the labels in the attached diagram are as follows:

[0027] 1-Arc-shaped base, 101-Operating window, 102-Guide groove, 103-Connecting hole, 104-Limiting ring, 2-Moving plate, 201-Through groove, 202-Locking bolt, 203-Baffle, 204-Adhesive block, 205-Meshing hole, 3-Guide base, 301-Guide hole, 302-Guide threaded tube, 4-Gear, 5-Adjusting wheel, 501-Slot, 502-Moving block, 503-Spring, 6-Fixing strap, 601-Anti-slip pad, 7-Annular air cushion, 701-Expansion knot, 8-Storage airbag. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Example 1

[0030] See Figures 1 to 5 As shown, this embodiment provides a specific implementation of a Kirschner wire insertion guide for the wrist joint. The main body includes an arc-shaped base 1, which is in the shape of an arc plate. Its curvature is adapted to the natural curvature of the arm at the wrist, and it can fit well with the outer side of the patient's forearm. Fixing straps 6 are fixedly connected to the left and right sides of the arc-shaped base 1, and the ends of the two fixing straps 6 are respectively provided with Velcro, which can be used to fix them together, thereby stably fixing the arc-shaped base 1 to the forearm at the patient's wrist. An anti-slip pad 601 is fixedly provided on the inner surface of the fixing strap 6. The anti-slip pad 601 is made of medical-grade silicone and has an anti-slip texture on the surface. It can fit tightly with the patient's skin, increase friction, and effectively prevent the fixing strap 6 from sliding or shifting during the operation.

[0031] A rectangular operating window 101 is provided on the front surface of the arc-shaped base 1. The front and rear inner walls of the operating window 101 are symmetrically provided with identical guide grooves 102. The guide grooves 102 are curved, and their curvature is completely consistent with that of the arc-shaped base 1. A movable plate 2 is slidably engaged within the operating window 101 via the guide grooves 102. The front and rear ends of the movable plate 2 are respectively embedded in the corresponding guide grooves 102, allowing it to slide circumferentially along the extension direction of the guide grooves 102. A vertical through groove 201 is provided on the movable plate 2. A guide base 3 is hinged inside the through groove 201 via a hinge shaft. The guide base 3 can swing back and forth on the movable plate 2 around the hinge shaft, thereby adjusting the pitch angle of the needle insertion. Locking bolts 202 and baffles 203 are respectively provided on the left and right sides of the guide base 3 on the movable plate 2. The locking bolts 202 are set perpendicular to the side of the guide base 3 and are threaded into the movable plate 2. When the locking bolts 202 are tightened, their ends can press against the side of the guide base 3 to lock and fix the guide base 3. When the locking bolts 202 are loosened, the guide base 3 can swing freely. The baffles 203 are semi-circular, and the center of their arc coincides with the hinge point of the guide base 3. Angle scales are engraved on the arc surface of the baffles 203, which can intuitively display the pitch angle of the guide base 3, making it easy for the operator to accurately control the needle insertion angle.

[0032] The guide base 3 has a fan-shaped structure with a vertically opening guide hole 301 in its center. The inner wall of the guide hole 301 has internal threads, and the outer wall of the guide threaded tube 302 has external threads that match the internal threads. The guide threaded tube 302 is threadedly fitted into the guide hole 301. The guide threaded tube 302 has a hollow channel running vertically through it, allowing the Kirschner wire to be inserted. Furthermore, the guide threaded tube 302 is available in various inner diameters to accommodate Kirschner wires of different diameters commonly used in clinical practice. The appropriate guide threaded tube 302 can be selected according to the surgical needs.

[0033] Arc-shaped fitting blocks 204 are fixedly installed on the front and rear side walls of the through groove 201. The inner arc surface of the fitting block 204 is adapted to the arc of the top of the guide base 3. The inner arc surface of the fitting block 204 is in contact with the top surface of the guide base 3, which can restrict the axial movement of the guide base 3 on the hinge axis and improve its stability.

[0034] A closed chamber is formed on the rear side of the arc-shaped base 1, corresponding to the guide groove 102. A gear 4 is rotatably mounted inside the chamber. Multiple meshing holes 205, matching the tooth profile of the gear 4, are evenly formed on the rear end of the movable plate 2 along its sliding direction. The teeth of the gear 4 extend into and mesh with the meshing holes 205. The rotation of the gear 4 drives the movable plate 2 to slide circumferentially along the guide groove 102, thereby adjusting the circumferential angle of the needle insertion. A connecting hole 103 is concentrically formed on the arc-shaped base 1 corresponding to the axis of the gear 4. A limit ring 104 is concentrically fixedly installed on the top periphery of the connecting hole 103. An adjusting wheel 5 is coaxially sleeved on the inner side of the limit ring 104. The central axis of the adjusting wheel 5 passes through the connecting hole 103 and is coaxially fixedly connected to the gear 4. Rotating the adjusting wheel 5 drives the gear 4 to rotate synchronously.

[0035] The adjusting wheel 5 has symmetrical slots 501 on both sides. A movable block 502 is slidably installed in each slot 501. The outer end of the movable block 502 has a protruding serrated shape. The inner surface of the limiting ring 104 also has a serrated structure that matches the end of the movable block 502, allowing the movable block 502 and the limiting ring 104 to engage with each other. A spring 503 is provided between the inner end of the movable block 502 and the bottom of the slot 501. The spring 503 can push the movable block 502 outwards, causing the serrated end of the movable block 502 to engage with the inner surface of the limiting ring 104, thereby locking the adjusting wheel 5. When it is necessary to rotate the adjusting wheel 5, first press the movable blocks 502 on both sides at the same time, so that the movable blocks 502 compress the spring 503 and retract inward. At this time, the adjusting wheel 5 can be rotated to drive the gear 4 to rotate. Through the cooperation of the gear 4 and the meshing hole 205, the moving plate 2 is driven to slide along the guide groove 102 to realize the adjustment of the circumferential angle of the moving plate 2. After the adjustment is completed, release the movable block 502. Under the elastic force of the spring 503, the movable block 502 automatically extends outward to lock the adjusting wheel 5.

[0036] An annular air cushion 7 is fixedly installed on the inner surface of the front end of the arc-shaped base 1. The annular air cushion 7 is circular in shape, with its center coinciding with the corresponding circle of the arc-shaped base 1, and surrounds the patient's wrist. Multiple expansion knots 701 are evenly distributed around the inner circumference of the annular air cushion 7. The expansion knots 701 are connected to the interior of the annular air cushion 7 and can further expand inward after inflation. A storage air bladder 8 is connected to the side of the annular air cushion 7 via a flexible conduit, and a valve controlling the airflow is installed on the conduit between the storage air bladder 8 and the annular air cushion 7. After the device is initially fixed to the patient's arm with the fixing strap 6, the valve is opened, and the storage air bladder 8 is squeezed to inflate the annular air cushion 7. After the annular air cushion 7 and the expansion knots 701 inflate, they fit tightly against the patient's wrist skin, further securing the patient's wrist.

[0037] The procedure for using this device is as follows: Before surgery, select a guide thread tube 302 with the corresponding inner diameter according to the diameter of the Kirschner wire required for the surgery, and screw it into the guide hole 301 of the guide base 3; place the arc-shaped base 1 against the outside of the patient's forearm, so that the annular air cushion 7 surrounds the patient's wrist, and initially fix the device to the patient's arm with the Velcro at the ends of the two fixing straps 6; open the valve on the conduit between the storage air bag 8 and the annular air cushion 7, squeeze the storage air bag 8 to inflate the annular air cushion 7, and after the annular air cushion 7 and the expansion knot 701 have fully inflated and firmly fixed the patient's wrist, close the valve; at the same time, press the adjusting wheel. 5. Move the movable blocks 502 on both sides to disengage them from the limiting ring 104. Rotate the adjusting wheel 5 to drive the gear 4 to rotate. Through the cooperation of the gear 4 and the meshing hole 205, drive the moving plate 2 to slide along the guide groove 102. Adjust the guide base 3 to the target needle insertion circumferential position. Loosen the movable block 502 to complete the circumferential angle locking. Loosen the locking bolt 202, swing the guide base 3, and adjust it to the target needle insertion pitch angle by referring to the angle scale on the baffle 203. Tighten the locking bolt 202 to complete the pitch angle locking. Insert the Kirschner wire into the hollow channel of the guide thread tube 302 and puncture along the guide direction.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A k-wire insertion guide for a wrist joint, characterized by: The system includes an arc-shaped base (1), with fixing straps (6) connected to the left and right sides of the arc-shaped base (1) respectively. The inner surface of the fixing straps (6) is provided with anti-slip pads (601). An operation window (101) is provided at the front of the arc-shaped base (1). The front and rear inner walls of the operation window (101) are provided with guide grooves (102) that are consistent with the arc of the arc-shaped base (1). A movable plate (2) is slidably engaged in the operation window (101) through the guide grooves (102). A through groove (201) is vertically provided on the movable plate (2). A guide base (3) is hinged inside the through groove (201). A meshing hole (205) is provided at the rear end of the movable plate (2). The guide base (3) has a vertically opened guide hole (301) in the middle, and the rear of the arc base (1) has a gear (4) that meshes with the meshing hole (205). The arc base (1) has a connecting hole (103) that is coaxial with the gear (4), and an adjusting wheel (5) passes through the connecting hole (103). The adjusting wheel (5) is coaxially connected with the gear (4). An annular air cushion (7) is fixed on the inner side of the front end of the arc base (1).

2. The wrist K-wire guide of claim 1, wherein: The guide hole (301) is internally threaded with a guide threaded tube (302).

3. The wrist K-wire insertion guide of claim 1, wherein: Locking bolts (202) and baffles (203) are respectively provided on both sides of the guide base (3) on the moving plate (2).

4. The wrist K-wire guide of claim 1, wherein: A limiting ring (104) is provided on the top periphery of the connecting hole (103), and the adjusting wheel (5) is coaxially sleeved on the inner side of the limiting ring (104); a slot (501) is symmetrically opened on the adjusting wheel (5), a movable block (502) is provided in the slot (501), a spring (503) is provided between the movable block (502) and the adjusting wheel (5), and the movable block (502) is engaged with the inner surface of the limiting ring (104).

5. The wrist K-wire insertion guide of claim 1, wherein: The annular air cushion (7) has multiple expansion knots (701) distributed around its circumference, and the annular air cushion (7) is connected to a storage air bladder (8) via a conduit.

6. The wrist K-wire insertion guide of claim 1, wherein: Arc-shaped fitting blocks (204) are fixed on the front and rear sides of the through groove (201), and the curvature of the fitting block (204) is adapted to the curvature of the top end of the guide base (3).

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