A tripod for guiding needle insertion and positioning of scaphoid fracture

Abstract

The invention discloses a tripod for guiding and positioning needle insertion of scaphoid fracture, which is characterized by comprising: a supporting foot, a tripod connector, a catheter, and a catheter supporting foot; the supporting foot is universally connected to the bottom of the tripod connector, the tail end of the catheter is in an oblique shape and dynamically connected to the top of the tripod connector, and the catheter supporting foot is movably sleeved on the bottom of the catheter; the supporting foot is provided with a telescopic supporting rod, the top of which is universally connected to the bottom of the tripod connector, and the rotation damping of the telescopic rod universally connected to the tripod connector at the top increases with the increase of the compression degree; the device can simulate the needle insertion route for fixing the scaphoid guide needle through the tripod, and it is no longer necessary to completely expose the scaphoid first and then fix it surgically like the traditional pressurized fixation method, which causes less overall trauma to the patient and facilitates his postoperative recovery; at the same time, it simplifies the repeated surgical process, reduces the workload of the surgeon, and improves the success rate of the operation.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a scaphoid fracture guiding needle insertion positioning tripod. Background Art

[0002] The navicular bone is a small bone in the wrist joint. It is located near the radial side of the wrist and is shaped like a boat, hence its name. However, it is irregular, with a long and narrow back and rough and uneven surface, and forms a joint with the radius. When a person falls and falls, the palm of the hand lands on the ground, and the navicular bone is the first to be hit, and is compressed between the radius and the capitate bone, forming a fracture. Because the navicular bone is located in a position with high shear force and poor blood supply, it is difficult to heal.

[0003] Scaphoid fractures are divided into three types according to the location of the fracture: lumbar fracture, proximal fracture, and tubercle fracture; local swelling and pain after injury, limited wrist joint movement and increased pain, tenderness in the nasopharyngeal fossa and scaphoid tubercle. Sometimes the symptoms of a minor fracture are not obvious, similar to the symptoms of a wrist sprain, and are easily misdiagnosed and ignored. X-rays of the wrist joint in three positions, anteroposterior, lateral and oblique, can confirm the location and direction of the fracture. If the fracture is unclear and clinical symptoms suspect a fracture, it should be treated as a fracture temporarily, and the X-ray should be rechecked after two weeks. Due to bone absorption at the fracture site, the fracture line can be clearly identified. The scaphoid nutrient blood vessels mainly enter from the tubercle and the middle of the outer side. Most of the area around the scaphoid is cartilage, without periosteum attachment. After the fracture, it can only be connected by endogenous bone callus. After the fracture, the nutrient blood vessels are damaged, and the proximal end is prone to aseptic necrosis due to ischemia.

[0004] Currently, the fixation treatment for scaphoid fractures in clinical practice requires cutting open the patient's affected area, exposing the scaphoid, and then fixing it with screws. This causes great trauma to the patient, and the entire operation is cumbersome, placing a great burden on the surgeon.

[0005] Therefore, a device is needed in clinical practice to determine the direction of needle insertion inside and outside the affected area, so that the scaphoid bone does not need to be exposed. Summary of the invention

[0006] In order to solve the above technical problems, the present invention designs a scaphoid fracture guiding needle insertion and positioning tripod, and builds a guiding channel on the outside to solve the problem that the above-mentioned traditional scaphoid fracture exposure and fixation causes great damage to patients.

[0007] In order to achieve the technical effect of solving the above technical problems, the present invention is implemented by the following technical solutions: a scaphoid fracture guide needle insertion positioning tripod, characterized in that it includes: a support leg, a tripod connector, a catheter, and a catheter support leg;

[0008] The support leg is universally connected to the bottom of the tripod connector, the tail end of the conduit is dynamically connected to the top of the tripod connector in an oblique shape, and the conduit support leg is movably sleeved on the bottom of the conduit;

[0009] The support foot is provided with a retractable support rod, the top of which is universally connected to the bottom of the tripod connector, and the rotation damping of the top of the retractable rod universally connected to the tripod connector increases with the increase of the degree of compression;

[0010] Furthermore, the top and bottom two-legged legs of the three-legged connector are both provided with locking universal joints, the top locking universal joint is universally connected to an extender, the catheter is movably sleeved on the extender, and the supporting leg is universally connected to the locking universal joint of the bottom two-legged legs;

[0011] Furthermore, the locking universal joint is in the form of a spherical coating, the outer side of which is threadedly connected with a locking knob, the inner plane of the locking knob is fixedly provided with a friction layer, and the inner cavity of the spherical cavity of the locking universal joint is provided with a compressible and deformable rubber layer;

[0012] Furthermore, the extender comprises a connecting rod with a sphere, and a sleeve fixedly connected to the connecting rod, and the sleeve is provided with a spiral limiter which can rotatably lock the limit guide tube;

[0013] Furthermore, the support rod of the support foot comprises a main rod and a telescopic rod that is movable and retractable in the main rod, a locking device that can lock the limited telescopic rod is fixedly arranged at the lower end of the main rod, a universally connected ball is arranged at the upper end, a compression rod that can be retracted out of the upper end surface of the top of the main rod is arranged in the inner cavity of the fixed end of the main rod, an extrusion end is arranged at the top, a limiting platform is arranged at the fixed top of the telescopic rod and the inner cavity of the main rod, and a ball is arranged at the bottom; a return spring is arranged between the limited bottom of the telescopic rod and the bottom surface of the inner cavity of the main rod and between the top surface of the telescopic rod and the bottom surface of the compression rod;

[0014] Furthermore, the bottom of the support rod is universally connected to a support pad through the ball at the bottom of the telescopic rod, and the support pad is provided with a limit hole and a universally connected movable universal joint; the movable universal joint is in a balloon-covered shape, and a rubber layer is fixedly provided on its inner surface;

[0015] Furthermore, the locking device comprises a knob threadedly connected to one side of the main rod, and a friction block connected to the other side of the main rod by a back spring, and a friction layer is fixedly provided on the end surface of the button contacting the main rod;

[0016] Furthermore, the overall structure of the catheter support foot is the same as that of the extender, and the bottom of the catheter support foot is universally connected to the support pad;

[0017] Another object of the present invention is to provide a method for using a tripod for guiding needle insertion and positioning of scaphoid fractures:

[0018] 1. Use existing technology, such as X-rays, and have the doctor determine the positions of the two supporting legs;

[0019] 2. At this position, screws are inserted through the limiting holes of the support pad and nailed into the patient's bone to fix the support pad, that is, fix the point of the support foot;

[0020] 3. Fix the patient's affected palm;

[0021] 4. Under medical fluoroscopy, determine the direction of the guide needle insertion;

[0022] 5. Loosen all the knobs used for limiting;

[0023] 6. Also under medical fluoroscopy, adjust the position of the catheter so that its axis coincides with the guide needle insertion angle line determined above;

[0024] 7. Tighten all locking knobs until the movable joints are not easily displaced and can be relatively displaced by applying external force;

[0025] 8. Confirm again whether the catheter axis and the guide needle insertion angle line are completely coincident;

[0026] 9. After confirming that everything is correct, tighten the locking knob until it does not move easily due to manual pressure;

[0027] 10. Under the guidance of the catheter, a guide needle is implanted into the affected area of ​​the scaphoid fracture.

[0028] The beneficial effects of the present invention are:

[0029] 1. First, the device constructs an external fixation and positioning device during the positioning process of scaphoid fracture. The tripod can simulate the needle insertion route of the scaphoid guide needle, and the guide needle can be directly implanted in the affected part. It is no longer necessary to completely expose the scaphoid bone and then fix it surgically like the traditional pressure fixation method. The overall trauma to the patient is small and the postoperative recovery is convenient. At the same time, it simplifies the repeated surgical process, reduces the workload of the surgeon, and improves the success rate of the operation.

[0030] 2. Secondly, the support foot of the device is supported in the air by a spring and has a compression rod that can be extended and retracted up and down, so that the support foot is compressed during the use of the entire device while increasing the rotational damping of the upper end locking universal joint. Specifically, the upper spring is compressed while the telescopic rod of the support foot moves upward, and the elastic force of the spring is converted upward into a thrust force of the compression rod. The compression rod generates friction when contacting the inner side wall of the locking universal joint, and the greater the degree of spring compression, the greater the upward elastic force, that is, the greater the differential friction. In this way, medical staff can more easily control the rotation angle of the universal joint while holding the device to adjust the angle, thereby improving the accuracy of their control and benefiting the improvement of their angle control accuracy.

[0031] 3. The telescopic part of the supporting foot and the rotating part of the universal joint of the device are provided with components to increase the damping force, such as rubber layers, friction blocks, etc., to limit the shape change of the entire device, so that the operator can easily control and adjust the guiding state of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0033] Figure 1 The schematic diagram of the overall structure of a tripod for guiding the needle insertion and positioning of a scaphoid fracture;

[0034] Figure 2 It is another overall structural schematic diagram of a tripod support for guiding needle insertion and positioning of scaphoid fracture;

[0035] Figure 3 It is a top view of a tripod for guiding needle insertion and positioning of scaphoid fractures;

[0036] Figure 4 It is a side view of a tripod for guiding needle insertion and positioning of scaphoid fractures;

[0037] Figure 5 It is a schematic diagram of the internal structure of the supporting legs of a tripod for guiding the insertion of needles and positioning of scaphoid fractures;

[0038] Figure 6 It is a schematic diagram of the internal structure of a locking universal joint of a tripod for guiding the insertion of a needle and positioning a scaphoid fracture;

[0039] Figure 7 It is a schematic diagram of the internal structure of a movable universal joint of a tripod for guiding the insertion of needles and positioning of scaphoid fractures;

[0040] Figure 8 Yes Figure 5 A partial enlarged schematic diagram of the middle portion 7;

[0041] Fig. 9 Yes Figure 5 A partial enlarged schematic diagram of the middle portion 8;

[0042] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0043] 1-support foot, 11-support rod, 111-main rod, 112-telescopic rod, 1122-limiting platform, 113-locking device, 1131-knob, 1132-friction block, 114-compression rod, 1141-extrusion end, 115-reset spring, 2-three-pin connector, 21-locking universal joint, 211-locking knob, 2111-friction layer, 212-rubber layer, 23-extender, 231-cylinder, 232-screw limiter, 3-catheter, 4-catheter supporting foot, 5-sphere, 6-support pad, 61-limiting hole, 62-movable universal joint. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0045] Example 1

[0046] See also Figures 1 to 9 As shown, a scaphoid fracture guiding needle insertion positioning tripod bracket is characterized by comprising: a supporting leg 1, a tripod connector 2, a catheter 3, and a catheter supporting leg 4;

[0047] The support leg 1 is universally connected to the bottom of the tripod connector 2, the tail end of the catheter 3 is dynamically connected to the top of the tripod connector 2 in an oblique shape, and the catheter support leg 4 is movably sleeved on the bottom of the catheter 3; the two support legs 1 and the catheter 3 constitute the supporting whole of the tripod support frame, and the catheter 3 provides a guide channel for the guide needle to enter.

[0048] The support foot 1 is provided with a retractable support rod 11, the top of which is universally connected to the bottom of the tripod connector 2. As the degree of compression increases, the rotation damping of the top of the retractable rod 11 and the universal connection with the tripod connector 2 increases; so that during the actual adjustment process, the universal joint will not rotate at will, giving the operator enough control confidence, which is beneficial to the adjustment of its angle and orientation;

[0049] The top and bottom two legs of the tripod connector 2 are both provided with a locking universal joint 21, the top locking universal joint 21 is universally connected to an extender 23, the catheter 3 is movably sleeved on the extender 23, and the support leg 1 is universally connected to the locking universal joint 21 of the bottom two legs; the catheter 3 can slide up and down on the extender 23 to cooperate with the adjustment of the overall state of the device;

[0050] The locking universal joint 21 is in the form of a sphere covering as a whole, and a locking knob 211 is connected to the outer thread thereof. The locking knob 211 is tightened inwardly through the thread to press against the internal movable component thereof to achieve a locked state. A friction layer 2111 is fixedly provided on the inner plane of the locking knob 211 to improve the locking ability of the locking knob 211. A compressible and deformable rubber layer 212 is provided in the inner cavity of the sphere of the locking universal joint 21 to provide a rotation damping during the rotation of the internal component thereof, so as to facilitate the fixing of the joint state.

[0051] The extender 23 includes a connecting rod with a ball 5, and a sleeve 231 fixedly connected to the connecting rod, and the sleeve 231 is provided with a screw limiter 232 that can rotate and lock the limiting catheter, and the screw limiter 232 rotates to press the catheter 3 to fix the catheter 3;

[0052] The support rod 11 of the support foot 1 includes a main rod 111 and a telescopic rod 112 that can be movably extended and retracted in the main rod 111. A locker 113 that can lock and limit the telescopic rod 112 is fixedly arranged at the lower end of the main rod 111, and a universally connected ball 5 is arranged at the upper end. A compression rod 114 that can be extended and retracted to the upper end surface of the top of the main rod 111 is arranged in the inner cavity at the top of the main rod 111, and an extrusion end head 1141 is arranged at the top. A limiting platform 1122 is arranged at the fixed top of the telescopic rod 112 and the inner cavity of the main rod 111, and a ball 5 is arranged at the bottom; a return spring 115 is arranged between the bottom of the limiting platform 1122 of the telescopic rod 112 and the bottom surface of the inner cavity of the main rod 111, and between the top surface of the telescopic rod 112 and the bottom surface of the compression rod 114;

[0053] The bottom of the support rod 11 is universally connected to a support pad 6 through a ball 5 at the bottom of the telescopic rod 112. The support pad 6 is provided with a limit hole 61 and a universally connected movable universal joint 62; the movable universal joint 62 is in a balloon-covered shape, and a rubber layer 212 is fixedly provided on its inner surface;

[0054] The locker 113 includes a knob 1131 threadedly connected to one side of the main rod 111, and a friction block 1132 connected to the other side of the main rod 111 by a back return spring 5. The end surface of the knob 1131 contacting the main rod 111 is fixed with a friction layer 1132; the return spring 5 provides elastic force to tightly attach the friction block 1132 to the outer side of the main rod 111, so that there is a damping force in the movement process of the main rod 111, limiting the movement trend of the telescopic rod 112, and facilitating the precise adjustment of the entire device;

[0055] The overall structure of the catheter support foot 4 is the same as that of the extender 23 , and the bottom of the catheter support foot 4 is universally connected to the support pad 6 .

[0056] Example 2

[0057] This embodiment is a specific method and steps for using a tripod for guiding needle insertion and positioning of scaphoid fractures:

[0058] 1. Use existing technology, such as X-rays, and have the doctor determine the positions of the two supporting legs;

[0059] 2. At this position, screws are inserted through the limiting holes of the support pad and nailed into the patient's bone to fix the support pad, that is, fix the point of the support foot;

[0060] 3. Fix the patient's affected palm;

[0061] 4. Under medical fluoroscopy, determine the direction of the guide needle insertion;

[0062] 5. Loosen all the knobs used for limiting;

[0063] 6. Also under medical fluoroscopy, adjust the position of the catheter so that its axis coincides with the guide needle insertion angle line determined above;

[0064] 7. Tighten all locking knobs until the movable joints are not easily displaced and can be relatively displaced by applying external force;

[0065] 8. Confirm again whether the catheter axis and the guide needle insertion angle line are completely coincident;

[0066] 9. After confirming that everything is correct, tighten the locking knob until it does not move easily due to manual pressure;

[0067] 10. Under the guidance of the catheter, a guide needle is implanted into the affected area of ​​the scaphoid fracture.

[0068] In summary, in the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A tripod for guiding needle insertion and positioning of scaphoid fracture, characterized in that: include: Support legs, a tripod connector, a catheter, and a catheter support leg; the number of the support legs is two, and the support legs and the catheter constitute the supporting whole of the tripod bracket; The support foot is universally connected to the bottom of the tripod connector, the tail end of the conduit is dynamically connected to the top of the tripod connector in an oblique shape, and the conduit support foot is movably sleeved on the bottom of the conduit; the support foot is provided with a retractable support rod, the top of which is universally connected to the bottom of the tripod connector, and the rotation damping of the top of the retractable support rod universally connected to the tripod connector increases with the increase of the degree of compression; The top and bottom two-legged legs of the tripod connector are both provided with locking universal joints, the top locking universal joint is universally connected with an extender, the catheter is movably sleeved on the extender, and the supporting leg is universally connected to the locking universal joint of the bottom two-legged legs; the bottom locking universal joint is in the form of a spherical coating as a whole, and a locking knob is threadedly connected to its outer side, a friction layer is fixedly provided on the inner plane of the locking knob, and a compressible and deformable rubber layer is provided in the inner cavity of the sphere of the locking universal joint; the supporting rod of the supporting leg includes a main rod and a telescopic rod that can be movably extended and retracted in the main rod, a locking device that can lock the telescopic rod is fixedly provided at the lower end of the main rod, and a universally connected sphere is provided at the upper end, and the inner cavity of the fixed end of the main rod is provided with a telescopic The compression rod on the upper end surface of the top of the output main rod has an extrusion end head on its top, and a limit platform is provided at the fixed top of the telescopic rod and the inner cavity of the main rod, and a sphere is provided at the bottom; a return spring is provided between the limit bottom of the telescopic rod and the bottom surface of the inner cavity of the main rod, and between the top surface of the telescopic rod and the bottom surface of the compression rod; the bottom of the support rod is universally connected to a support pad through the sphere at the bottom of the telescopic rod, and the support pad is provided with a limit hole and a universally connected movable universal joint; the movable universal joint is in the shape of a balloon covering, and a rubber layer is fixedly provided on its inner surface; the locker includes a knob threadedly connected to one side of the main rod, and a friction block connected to the other side of the main rod by a back spring, and the end surface of the knob contacting the main rod is fixedly provided with a friction layer.

2. A scaphoid fracture guide needle insertion positioning tripod according to claim 1, characterized in that: The extender comprises a connecting rod with a sphere, and a sleeve fixedly connected to the connecting rod, wherein the sleeve is provided with a spiral limiter which can rotatably lock and limit the guide tube.

3. A tripod for guiding needle insertion and positioning of scaphoid fracture according to claim 1, characterized in that: The overall structure of the catheter support foot is the same as that of the extender, and the bottom of the catheter support foot is universally connected to the support pad.

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