Minimally invasive guider for scaphoid fracture

Abstract

The utility model discloses a minimally invasive guider for scaphoid fracture, and relates to the technical field of medical instruments. The base is arranged on the wrist and palm side of a patient, one side of the base extends outwards to form side wings, a channel is formed in the middle of the base in the length direction in a penetrating mode and used for containing kirschner wires, and the base is made of transparent materials; the number of the fan-shaped clamping plates is two, the two fan-shaped clamping plates are symmetrically arranged on the base relative to the axis of the through hole, one side edge of each fan-shaped clamping plate coincides with the upper surface of the base, the fan-shaped clamping plates are perpendicularly and fixedly connected with the base, and scale marks representing the included angle between the fan-shaped clamping plates and the horizontal plane of the base are arranged on the fan-shaped clamping plates. The sleeve is arranged between the two fan-shaped clamping plates, the sleeve is in sliding connection with the two fan-shaped clamping plates through fixing blocks, the sleeve always points to the circle centers of the fan-shaped clamping plates in the axial direction in the sliding process, marking lines are arranged on one side of the sleeve and used for contrasting scales on the fan-shaped clamping plates, and a kirschner wire guider is arranged in the sleeve along the axis of the sleeve.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a minimally invasive guide for scaphoid fractures. Background Technology

[0002] Scaphoid fracture is a common type of wrist fracture. It accounts for 70% of wrist fractures and is the second most common fracture of the upper limb (after distal radius fractures).

[0003] For fresh scaphoid fractures without significant displacement, plaster cast immobilization is often used, and most cases heal successfully. However, the immobilization period can be as long as 12-16 weeks, leading to joint stiffness and affecting the rehabilitation of hand and wrist function. With advancements in surgical techniques and internal fixation devices, percutaneous compression screw fixation is now the most common treatment for scaphoid fractures. This minimally invasive procedure does not require exposure of the fracture ends, effectively protecting important structures such as wrist ligaments and joint capsules. Early efficacy and patient satisfaction are superior to traditional methods. However, due to the complex three-dimensional structure and concealed location of the scaphoid bone, even experienced surgeons require multiple fluoroscopic examinations and repeated attempts to insert the guide pin. Repeated pin insertion can affect the accuracy of internal fixation and even the blood supply to the scaphoid bone, impacting prognosis.

[0004] Currently, there are various Kirschner wire guides available for scaphoid fractures. Some guides have complex designs, numerous components, and cumbersome assembly, making them unsuitable for large-scale clinical application. Other guides are designed too simply, failing to achieve precise positioning and reduce intraoperative fluoroscopy and the number of needle insertions. Utility Model Content

[0005] Therefore, this utility model provides a minimally invasive guide for scaphoid fractures to solve the problems existing in the above-mentioned technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A minimally invasive guide for scaphoid fractures, characterized in that it comprises:

[0008] The base is placed on the patient's wrist. One side of the base extends outward with a wing. A channel is provided through the middle of the base along the length direction for inserting Kirschner wires. The base is made of transparent material.

[0009] The fan-shaped clamps are provided in twos, and the two fan-shaped clamps are symmetrically arranged on the base about the axis of the through hole. One side of each fan-shaped clamp coincides with the upper surface of the base. The fan-shaped clamps are vertically fixed to the base. The fan-shaped clamps are provided with scale lines representing the angle with the horizontal plane of the base.

[0010] A sleeve is disposed between two sector-shaped clamps, and the sleeve is slidably connected to the two sector-shaped clamps by a fixing block. During the sliding process, the sleeve always points axially towards the center of the sector-shaped clamps. A marking line is provided on one side of the sleeve for reference to the scale on the sector-shaped clamps. A guide hole is provided along the axis of the sleeve for inserting Kirschner wires.

[0011] The base has a through hole extending from the top to the bottom, and the axis of the through hole is perpendicular to the axis of the channel, allowing the Kirschner wire in the guide hole to pass through.

[0012] Optionally, each of the two sector-shaped clamps is provided with an arc-shaped groove concentric with the sector-shaped clamps. A fixing block is fitted on the sleeve. The fixing block has a U-shaped structure. The vertical parts on both sides of the fixing block are attached to the outer sides of the two sector-shaped clamps. A slider is fixedly connected at the front end of the vertical part of the fixing block opposite to the arc-shaped groove. The slider is slidably connected in the arc-shaped groove.

[0013] Optionally, the slider is provided with a snap-fit ​​part on one side between the two sector-shaped clamps, and the snap-fit ​​part is attached to the inner surface of the sector-shaped clamps.

[0014] Optionally, the marking line is disposed on one of the vertical portions of the fixing block.

[0015] Optionally, a handle is provided on the side of the fixing block away from the marking line, and the handle is fixedly connected to the fixing block.

[0016] Optionally, both the channel and the guide hole have a diameter of 1.1 mm to accommodate the insertion of a 1 mm Kirschner wire.

[0017] Optionally, the sector angle of the sector-shaped clamp is 90°.

[0018] Optionally, the base and the side wing are integrally formed, and the base and the fan-shaped clamping plate are integrally formed.

[0019] Optionally, the base, side wings, fan-shaped clamps, and fixing blocks are all made of rigid transparent plastic.

[0020] This utility model has at least the following beneficial effects:

[0021] This invention utilizes a transparent base with an internal channel for placing Kirschner wires. The affected limb is first placed flat on an abducting table with the forearm in supination. Using separate Kirschner wire fluoroscopy, the optimal insertion angle along the longitudinal axis of the scaphoid bone in the coronal plane is determined. Then, the Kirschner wire is marked along this positioning point on the palmar side of the wrist with a marker. The Kirschner wire is then inserted into the channel of the base, aligning it with the marking on the patient's wrist. The surgeon holds the base in place with one hand. Next, the fixing block on the fan-shaped splint is slid to adjust the guide sleeve to the appropriate angle, i.e., the sagittal insertion angle of the scaphoid bone. An assistant holds the guide handle, and the surgeon inserts the Kirschner wire through the guide sleeve. If the Kirschner wire angle needs adjustment after fluoroscopy, the forearm is placed in supination again, with the Kirschner wire in the base overlapping the wrist marking line. The guide sleeve angle is adjusted, and the insertion process is repeated. This invention has a simple structure, accurately locating the angles of the scaphoid bone in the coronal and sagittal planes, reducing the number of fluoroscopic procedures, and its simple structure makes it easier for the surgeon to operate. Attached Figure Description

[0022] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0024] Figure 1 This is a first-view structural diagram of an embodiment of the present invention;

[0025] Figure 2 This is a second-view structural schematic diagram of an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Base; 2. Side wings; 3. Channel; 4. Fan-shaped clamp; 5. Sleeve; 6. Fixing block; 7. Marking line; 8. Guide hole; 9. Arc-shaped slide groove; 10. Slider; 11. Snap-fit ​​part; 12. Handle; 13. Through hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," "fourth," etc. (if present), in the specification, claims, and accompanying drawings of this utility model are intended to distinguish the objects they refer to. For solutions with a sequential flow, this terminology need not be interpreted as describing a specific order or sequence; for solutions with device structures, this terminology does not distinguish between matters of importance or positional relationships.

[0030] Furthermore, the terms “comprising,” “having,” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may also include other steps or units that are not expressly listed but are inherent to these processes, methods, products, or devices, or steps or units added based on further optimizations of the inventive concept.

[0031] like Figure 1 and Figure 2 As shown, this utility model discloses a minimally invasive guide for scaphoid fractures, comprising:

[0032] This utility model has a tempered plastic structure, is completely transparent, and does not show up under intraoperative fluoroscopy.

[0033] Base 1 is placed on the palmar side of the patient's wrist. One side of base 1 has a wing 2 extending outward. A channel 3 is provided through the middle of base 1 along the long axis for inserting Kirschner wires.

[0034] There are two fan-shaped clamps 4. The two fan-shaped clamps 4 are symmetrically arranged on the base 1 about the axis of the through hole 13. One side of the fan-shaped clamp 4 coincides with the upper surface of the base 1. The fan-shaped clamp 4 is vertically fixed to the base 1. The fan-shaped clamp 4 is provided with scale lines representing the angle with the horizontal plane of the base 1.

[0035] Guide sleeve 5 is disposed between two sector clamps 4 and is slidably connected to the two sector clamps 4 by a fixing block 6. During the sliding process, the axial direction of the guide sleeve 5 always points to the center of the sector clamp 4. A marking line 7 is provided on one side of the guide sleeve 5 for reference to the scale on the sector clamp 4. A guide hole 8 is provided along the axis of the guide sleeve 5 for inserting Kirschner wires.

[0036] Through hole 13: The base 1 has a through hole 13 extending from the top to the bottom, and the axis of the through hole 13 is perpendicular to the axis of the channel 3, so that the Kirschner wire in the guide hole 8 can pass through.

[0037] A channel 3 is provided on the base 1 for inserting a 1mm Kirschner wire. The diameter of the channel 3 is 1.1mm for easy insertion. When positioning the base 1, a single Kirschner wire is used to determine the optimal puncture angle of the Kirschner wire at the patient's wrist using a fluoroscopic instrument. The angle is then marked with a marker. A Kirschner wire is then inserted into the channel 3. The transparent base 1 is placed on the wrist, and the Kirschner wire is aligned with the mark on the patient's wrist to determine the horizontal angle for puncture. The side wings 2 are designed to facilitate the doctor's fixation of the base 1.

[0038] The aforementioned sector-shaped clamp 4 is fixed on the base 1 and is set perpendicular to the base 1. Two sector-shaped clamps 4 are symmetrically arranged on both sides of the channel 3. A sleeve 5 is set between the two sector-shaped clamps 4. The sleeve 5 is set along the radial direction of the sector-shaped clamp 4 and points to the center position of the sector-shaped clamp 4. By sliding the fixing block 6 on the sector-shaped clamp 4, the angle between the sleeve 5 and the base 1 can be adjusted, thereby adjusting the angle of the puncture needle in the guide hole 8 on the sleeve 5. Vertical positioning is completed by referring to the scale line.

[0039] In a further embodiment, the sliding structure between the fixing block 6 and the sector-shaped clamping plate 4 is as follows: each of the two sector-shaped clamping plates 4 has an arc-shaped groove 9 concentric with the sector-shaped clamping plate 4. The fixing block 6 is sleeved on the sleeve 5. The fixing block 6 has a U-shaped structure. The vertical parts on both sides of the fixing block 6 are attached to the outer sides of the two sector-shaped clamping plates 4. A slider 10 is fixedly connected at the front end of the vertical part of the fixing block 6 opposite to the arc-shaped groove 9. The slider 10 is slidably connected in the arc-shaped groove 9. A locking part 11 is provided on one side of the slider 10 between the two sector-shaped clamping plates 4. The locking part 11 is attached to the inner surface of the sector-shaped clamping plate 4.

[0040] The aforementioned fixing block 6 has a U-shaped structure, which includes two vertical parts and one horizontal part. The horizontal part is tangentially attached to the arc surface of the two fan-shaped clamps 4, and the two vertical parts are attached to the outer plane of the two fan-shaped clamps 4. The slider 10 is fixed at the position corresponding to the arc-shaped groove 9 on the inner side of the vertical part, and a snap-fit ​​part 11 is provided on the side of the slider 10 that passes through the arc-shaped groove 9 and extends to the side of the horizontal part. Thus, the fixing block 6 is relatively fixed on the fan-shaped clamps 4 and can slide along the arc of the fan-shaped clamps 4, ensuring that the sleeve 5 always points to the center of the fan-shaped clamps 4.

[0041] The through hole 13 opened on the base 1 at the position of the fan-shaped clamp 4 allows the Kirschner wire in the guide hole 8 to pass through. The puncture angle is generally 30°-60°. The size of the through hole 13 needs to meet the requirement that the axis of the guide hole 8 can pass through the through hole 13 at any angle between 30°-60°, that is, the Kirschner wire can pass through.

[0042] The marking line 7 is set on one of the vertical parts of the fixing block 6.

[0043] The marking line 7 can correspond to the scale line on the fan-shaped clamp 4, making it convenient to locate the puncture angle.

[0044] Furthermore, a handle 12 is provided on the side of the fixing block 6 away from the marking line 7, and the handle 12 is fixedly connected to the fixing block 6.

[0045] The handle 12 facilitates the fixing of the fixing block 6.

[0046] Both channel 3 and guide hole 8 have a diameter of 1.1 mm, which can accommodate the insertion of a 1 mm Kirschner wire.

[0047] The sector angle of sector-shaped clamp 4 is 90°.

[0048] The base 1 and the side wing 2 are integrally formed, and the base 1 and the fan-shaped clamp 4 are integrally formed.

[0049] The base 1, side wings 2, fan-shaped clamps 4, and fixing blocks 6 are all made of rigid transparent plastic.

[0050] This utility model consists of left and right sides, including a base 1, with a raised side wing 2 on the side of the base 1 for the surgeon to fix the guide; a channel 3 is designed in the center of the longitudinal axis of the base 1 to accommodate a 1.0mm Kirschner wire for positioning the scaphoid bone longitudinal axis, and a through hole 13 is designed at the midpoint of the channel 3 so that the guide wire can pass smoothly through the through hole 13; two fan-shaped clamps 4 with 0-90° scale markings are erected side by side on the vertical plane of the center of the longitudinal axis of the base 1, and a hollow arc-shaped groove 9 is made next to the scale of each fan-shaped clamp 4. The middle of the fan-shaped clamp 4 can accommodate a 1.0mm Kirschner wire guide sleeve 5. Fixing devices are set on both sides of the proximal end of the sleeve 5, which fit into the groove of the clamp, so that the guide sleeve 5 can slide continuously along the groove of the clamp within the range of 0-90°; a marking point is set at the midpoint of the fixing block 6 for comparison with the scale of the fan-shaped clamp 4, and a handle 12 is designed on the proximal side of the guide sleeve 5 for stabilizing the sleeve 5.

[0051] The design utilizes a plastic structure, ensuring unobstructed and uninterrupted intraoperative fluoroscopy. Its integrated design is relatively simple, incorporating a handle 12 and a fixation device for easy and convenient operation, enabling widespread clinical application. After locating the needle insertion angle in the coronal plane of the scaphoid bone during surgery, a mark can be made on the body surface for easy subsequent procedures, eliminating the need for repeated fluoroscopy. Simultaneously, the needle insertion angle can be continuously adjusted within the fan-shaped splint 4, meeting the precision and accuracy requirements of percutaneous needle insertion and reducing the number of needle insertions and fluoroscopy cycles during surgery.

[0052] The base 1 contains a Kirschner wire channel 3. After the longitudinal axis of the scaphoid bone is located and marked on the body surface, the longitudinal axis of the scaphoid bone can be accurately located through this Kirschner wire channel 3 without the need for repeated fluoroscopy confirmation.

[0053] The connection design between the fan-shaped clamp 4 and the guide sleeve 5 allows the guide sleeve 5 to continuously change the needle insertion angle; while the handle 12 on the side of the sleeve 5 can fix the sleeve 5, making needle insertion convenient.

[0054] The above specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0055] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0056] The present invention has been described in a relatively specific and detailed manner above through general description and specific embodiments. It should be noted that, without departing from the concept of the present invention, various modifications and improvements can be made to these specific embodiments, all of which fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A minimally invasive guide for scaphoid fractures, characterized in that, include: The base is placed on the patient's wrist. One side of the base extends outward with a wing. A channel is provided through the middle of the base along the length direction for inserting Kirschner wires. The base is made of transparent material. The fan-shaped clamps are provided in twos, and the two fan-shaped clamps are symmetrically arranged on the base along the axis of the through hole. One side of each fan-shaped clamp coincides with the upper surface of the base. The fan-shaped clamps are vertically fixed to the base. The fan-shaped clamps are provided with scale lines representing the angle with the horizontal plane of the base. A sleeve is disposed between two sector-shaped clamps, and the sleeve is slidably connected to the two sector-shaped clamps by a fixing block. During the sliding process, the sleeve always points axially towards the center of the sector-shaped clamps. A marking line is provided on one side of the sleeve for reference to the scale on the sector-shaped clamps. A guide hole is provided along the axis of the sleeve for inserting Kirschner wires. The base has a through hole extending from the top to the bottom, and the axis of the through hole is perpendicular to the axis of the channel, allowing the Kirschner wire in the guide hole to pass through.

2. The minimally invasive guide for scaphoid fractures according to claim 1, characterized in that: Both of the fan-shaped clamps are provided with arc-shaped grooves concentric with the fan-shaped clamps. A fixing block is fitted on the sleeve. The fixing block has a U-shaped structure. The vertical parts on both sides of the fixing block are attached to the outer sides of the two fan-shaped clamps. A slider is fixedly connected at the front end of the vertical part of the fixing block opposite to the arc-shaped groove. The slider is slidably connected in the arc-shaped groove.

3. The minimally invasive guide for scaphoid fractures according to claim 2, characterized in that: The slider is positioned between two fan-shaped clamps and has a locking part on one side, which fits against the inner surface of the fan-shaped clamps.

4. The minimally invasive guide for scaphoid fractures according to claim 1, characterized in that: The marking line is set on one of the vertical parts of the fixed block.

5. The minimally invasive guide for scaphoid fractures according to claim 4, characterized in that: A handle is provided on the side of the fixing block away from the marking line, and the handle is fixedly connected to the fixing block.

6. The minimally invasive guide for scaphoid fractures according to claim 1, characterized in that: Both the channel and the guide hole have a diameter of 1.1 mm, accommodating the insertion of a 1 mm Kirschner wire.

7. The minimally invasive guide for scaphoid fractures according to claim 1, characterized in that: The sector angle of the sector-shaped clamp is 90°.

8. The minimally invasive guide for scaphoid fractures according to claim 1, characterized in that: The base and the side wings are integrally formed, and the base and the fan-shaped clamping plate are integrally formed.

9. The minimally invasive guide for scaphoid fractures according to claim 1, characterized in that: The base, side wings, fan-shaped clamps, and fixing blocks are all made of rigid transparent plastic.

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