Auxiliary guide sleeve for scaphoid fracture treatment
By designing an auxiliary guide sleeve for the treatment of scaphoid fractures, including a primary catheter and a secondary catheter, the problems of guide needle deformation and breakage and soft tissue damage were solved, thereby improving the safety and stability of the operation and facilitating the connection and handling of the catheter.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XUZHOU MINING GRP SECOND HOSPITAL
- Filing Date
- 2025-01-08
- Publication Date
- 2026-04-21
AI Technical Summary
In existing technologies, the guide needle is prone to deformation and breakage during puncture, damaging the surrounding soft tissue, and there is a lack of effective soft tissue protection devices, resulting in low surgical safety.
An auxiliary guide sleeve for treating scaphoid fractures of the wrist was designed, including a primary catheter and a primary guide sleeve to protect the guide needle and reduce deformation and damage. At the same time, a secondary catheter and a secondary guide sleeve were added to accommodate the hollow drill, improve surgical safety, and achieve stable connection and convenient packaging of the catheter through the cooperation of the slot and handle.
It effectively prevents guide needle deformation and breakage, reduces soft tissue damage, improves surgical safety and operational stability, and facilitates catheter connection and disposal.
Smart Images
Figure CN224140918U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically to an auxiliary guide sleeve for the treatment of scaphoid fractures. Background Technology
[0002] Scaphoid fractures are the most common wrist fractures, accounting for 70%–80% of wrist fractures and 2%–7% of all fractures. They are most common in young adults, with 60%–80% of scaphoid fractures occurring in the waist of the scaphoid bone. Some may be accompanied by distal radius fractures, lunate dislocations, etc. 80% of the surface of the scaphoid bone is covered by articular cartilage, which limits the choice of access point. Another limitation is the unique shape of the scaphoid bone. Due to its unique anatomy and blood supply, the scaphoid bone is prone to nonunion and osteonecrosis. Open surgery may damage surrounding blood vessels and nerves, causing further loss of blood supply. Currently, closed reduction and internal fixation surgery with intelligent assistance is often used. Herbert cannulated compression screws are commonly chosen for internal fixation, offering advantages such as minimal trauma, fewer complications, and a high fracture healing rate.
[0003] The Herbert screw treatment procedure is as follows:
[0004] Brachial plexus anesthesia was selected. The surgical approach was always palmar. After successful anesthesia, the patient was placed in a supine position with the affected limb abducted on an X-ray fluoroscopic operating table. The forearm was supinated, and a soft pad was placed under the wrist joint to maximize dorsiflexion and ulnar deviation. After satisfactory reduction of the scaphoid fracture under C-arm fluoroscopy, a guide pin was inserted at approximately 45 degrees to the dorsal and ulnar sides from the scaphoid tubercle. Ideally, the guide pin should be perpendicular to the fracture line; this is not necessary for oblique fractures. The pin should not penetrate the proximal pole of the scaphoid bone. After satisfactory placement of the guide pin under fluoroscopy, the pin was moved 0.5–1.5 meters along its length. Make a 0mm longitudinal incision, measure the depth, and drill a hole 2-4mm into the proximal subcortical region with a hollow drill. Select a Herbert screw of appropriate length and screw it in along the guide pin. The threaded portion of the screw tip must completely extend beyond the fracture line to apply pressure to the fracture end. Before tightening the Herbert screw, remove the guide pin, ensure that the tail of the Herbert screw is completely embedded under the bone, and ensure that the distal thread completely extends beyond the fracture line. Check the final position of the Herbert screw and determine the stability of the scaphoid bone under fluoroscopy.
[0005] However, because the guide needle is thin and soft, and there is no matching puncture sleeve to protect the soft tissue during puncture, there are often problems such as needing to puncture multiple times, guide needle deformation and breakage, and damage to surrounding soft tissue. Utility Model Content
[0006] To overcome the shortcomings of the existing technology, this utility model proposes an auxiliary guide sleeve for the treatment of scaphoid fractures of the wrist, including a rigid primary catheter with a sharp annular tip at the distal end and an integral primary guide sleeve with a conical cross-section at the proximal end. Both the primary catheter and the primary guide sleeve have hollow cavities and are open at both ends. The primary guide sleeve and the primary catheter are coaxially arranged and interconnected.
[0007] To achieve the above objectives, a primary guide sleeve is integrated with the primary catheter to facilitate the insertion of the guide needle into the primary catheter. The primary catheter acts as a soft tissue protective sleeve to assist the guide needle puncture and prevent the guide needle from deforming, breaking, or damaging the surrounding soft tissue.
[0008] Furthermore, the primary catheter has an inner diameter between 1.1 and 1.3 mm and a length between 49 and 51 mm.
[0009] With the above technical solution, the primary catheter has a diameter between 1.1 and 1.3 mm to facilitate the insertion of the guide needle, and the primary catheter has a length between 49 and 51 mm to facilitate the primary catheter to puncture into the scaphoid bone and facilitate the guide needle to penetrate the scaphoid bone.
[0010] Furthermore, the outer circumferential wall of the primary inlet sleeve is integrally provided with three primary handles, which are arranged in an array along the center line of the primary inlet sleeve. Each primary handle has rounded chamfers on both the upper and lower sides.
[0011] The above technical solution, by setting a primary handle, makes it easier for medical staff to grasp the primary insertion sheath and insert it into the scaphoid bone, thus improving the stability of the primary insertion sheath puncture.
[0012] Furthermore, a secondary catheter is also provided inside the primary catheter. The distal end of the secondary catheter has a sharp annular front, and the proximal end has an integrated secondary inlet sleeve with a conical cross-section. The secondary catheter and the secondary inlet sleeve have the same structure as the primary catheter and the primary inlet sleeve.
[0013] By using the above technical solution, a secondary catheter and a secondary inlet sleeve with the same structure as the primary catheter and the primary inlet sleeve are set up, so that a hollow drill can be inserted into the secondary inlet sleeve, reducing the possibility of the hollow drill breaking in the patient's body and improving the safety of the operation.
[0014] Furthermore, the secondary catheter has an inner diameter between 1.7 and 1.9 mm, a length between 49 and 51 mm, and the secondary inlet sleeve is smaller than the primary inlet sleeve, with the primary inlet sleeve fitted over the primary inlet sleeve.
[0015] The above technical solution allows the hollow drill rod to enter the lumen of the secondary catheter by setting an inner diameter between 1.7 and 1.9 mm, and the secondary catheter to enter the scaphoid bone and pass through the fracture line by setting a length between 49 and 51 mm.
[0016] Furthermore, the outer circumferential wall of the secondary inlet sleeve is integrally provided with three secondary handles, which are arranged in an array along the center line of the primary inlet sleeve, and each handle has rounded chamfers on both the upper and lower sides.
[0017] The above technical solution, by setting a secondary handle, makes it easier for medical staff to grasp the secondary insertion sleeve and insert it into the scaphoid bone, thus improving the stability of the secondary insertion sleeve puncture.
[0018] Furthermore, the primary handle and the secondary handle are arranged alternately, and the primary inlet sleeve has several slots that are adapted to the secondary handle. Each slot corresponds to a secondary handle, and the secondary handle and the primary inlet sleeve are connected by the slots.
[0019] The above technical solution facilitates the connection between the primary and secondary handles through the cooperation of the slot and the secondary handle, thereby facilitating the connection between the primary and secondary catheters and the packaging and disposal of the primary and secondary catheters.
[0020] In summary, this auxiliary guide for the treatment of scaphoid fractures has the following beneficial effects:
[0021] (1) The auxiliary guide sheath for treating scaphoid fractures of the wrist is designed with a primary guide sheath integrated with the primary catheter to facilitate the entry of the guide needle into the primary catheter. The primary catheter acts as a soft tissue protective sheath to assist the guide needle puncture and reduce the possibility of guide needle deformation and breakage and damage to surrounding soft tissue.
[0022] (2) The auxiliary guide sheath for treating scaphoid fractures of the wrist is designed with a secondary guide sheath and a secondary guide sheath that have the same structure as the primary guide sheath and the primary guide sheath. This allows for the insertion of a hollow drill into the secondary guide sheath, reducing the possibility of the hollow drill breaking in the patient's body and improving the safety of the surgery.
[0023] (3) The auxiliary guide sleeve for treating scaphoid fractures of the wrist facilitates the connection of the primary and secondary handles through the cooperation of the slot and the secondary handle, thereby facilitating the connection of the primary and secondary catheters, and making it convenient for the packaging and disposal of the primary and secondary catheters. Attached Figure Description
[0024] The present invention will be further described and explained below with reference to the accompanying drawings.
[0025] Figure 1 This is a schematic diagram of the overall structure of the preferred embodiment of this utility model;
[0026] Figure 2 This is a top view schematic diagram of the structure of the first-stage inlet sleeve of this utility model;
[0027] Figure 3 This is a schematic diagram of the connection structure between the primary and secondary inlet sleeves of this utility model.
[0028] Reference numerals: 1. Primary catheter; 2. Primary insertion sleeve; 3. Primary handle; 4. Secondary catheter; 5. Secondary insertion sleeve; 6. Secondary handle; 7. Slot. Detailed Implementation
[0029] The technical solution of this utility model will be more clearly and completely explained below with reference to the accompanying drawings and through the description of the preferred embodiments of this utility model.
[0030] like Figure 1-3 As shown, the preferred embodiment of this utility model provides an auxiliary guide sleeve for treating scaphoid fractures, comprising a rigid primary catheter 1 with a sharp annular tip at its distal end for puncture into the patient's body, and an integrated primary guide sleeve 2 with a conical cross-section at its proximal end. Both the primary catheter 1 and the primary guide sleeve 2 are hollow with openings at both ends. The primary guide sleeve 2 and the primary catheter 1 are coaxially arranged and interconnected. By providing the primary guide sleeve 2, which is integrated with the primary catheter 1, it is easier for the guide needle to enter the primary catheter 1. The primary catheter 1 acts as a soft tissue protective sleeve to assist in guide needle puncture, reducing the possibility of guide needle deformation and breakage, and damage to surrounding soft tissue.
[0031] like Figure 1 and Figure 2 and Figure 3 The primary catheter 1 has an inner diameter between 1.1 and 1.3 mm, a length between 48 and 52 mm, and a diameter between 1.1 and 1.3 mm to facilitate the insertion of the guide needle. The primary catheter 1 has a length between 48 and 52 mm to facilitate the puncture of the primary catheter 1 into the scaphoid bone and to facilitate the penetration of the guide needle through the scaphoid bone.
[0032] like Figure 1 and Figure 2 and Figure 3 The primary insertion sleeve 2 has three integrated primary handles 3 on its outer circumference. The three primary handles 3 are arranged in an array along the center line of the primary insertion sleeve 2. Each primary handle 3 has rounded chamfers on its upper and lower sides. By setting the primary handles 3, it is convenient for medical staff to grasp the primary insertion sleeve 2 and insert the primary insertion sleeve 2 into the scaphoid bone of the human body, thereby improving the stability of the primary insertion sleeve 2 puncture.
[0033] like Figure 1 and Figure 2 and Figure 3In actual clinical practice, during the process of drilling the hollow drill into the proximal subcortical region 2-4 mm, the drill rod is very prone to breakage inside the patient's body. To solve the above problem, a secondary catheter 4 is also installed inside the primary catheter 1. The distal end of the secondary catheter 4 has a sharp annular tip for puncture into the patient's body. The proximal end has an integrated secondary guide sleeve 5 with a conical cross-section. The secondary catheter 4 and the secondary guide sleeve 5 have the same structure as the primary catheter 1 and the primary guide sleeve 2. By setting up the secondary catheter 4 and the secondary guide sleeve 5 with the same structure as the primary catheter 1 and the primary guide sleeve 2, it is easier to insert the hollow drill into the secondary guide sleeve 5, reducing the possibility of the hollow drill breaking into the patient's body and improving the safety of the operation.
[0034] like Figure 1 and Figure 2 and Figure 3 The secondary catheter 4 has an inner diameter between 1.7 and 1.9 mm and a length between 49 and 51 mm. The secondary guide sleeve 5 is smaller than the primary guide sleeve 2. The primary guide sleeve 2 is fitted over the primary guide sleeve 2. By setting an inner diameter between 1.75 and 1.85 mm, it is convenient for the hollow drill rod to enter the cavity of the secondary catheter 4. By setting a length between 49 and 51 mm, it is convenient for the secondary catheter 4 to enter the scaphoid bone and pass through the fracture line.
[0035] like Figure 1 and Figure 2 and Figure 3 The secondary insertion sleeve 5 has three integrated secondary handles 6 on its outer circumference. The three secondary handles 6 are arranged in an array along the center line of the primary insertion sleeve 2. Each handle has rounded chamfers on both the upper and lower sides. By setting handles, it is convenient for medical staff to grasp the secondary insertion sleeve 5 and insert it into the scaphoid bone of the human body, thereby improving the stability of the secondary insertion sleeve 5 puncture.
[0036] like Figure 1 and Figure 2 and Figure 3 To facilitate the packaging and disposal of primary catheter 1 and secondary catheter 4, primary handle 3 and secondary handle 6 are arranged alternately. The primary inlet sleeve 2 has several slots 7 that are adapted to the secondary handle 6. Each slot 7 corresponds to a secondary handle 6. The secondary handle 6 and the primary inlet sleeve 2 are connected by the slots 7. The cooperation between the slots 7 and the secondary handle 6 facilitates the connection of primary handle 3 and secondary handle 6, thereby facilitating the connection of primary catheter 1 and secondary catheter 4.
[0037] When using this method, the patient lies supine with the affected limb abducted on an X-ray fluoroscopic operating table. The forearm is supinated, and a soft pad is placed under the wrist joint to maximize dorsiflexion and ulnar deviation of the wrist joint. Dorsiflexion and ulnar deviation of the wrist joint help with fracture reduction and also help move the trapezium dorsally to expose the needle insertion point of the scaphoid tubercle.
[0038] After satisfactory reduction of the scaphoid fracture under C-arm fluoroscopy, a package bag was removed to secure the primary catheter 1 and secondary catheter 4. The secondary handle 6 was grasped and pulled outward to separate the primary catheter 1 and secondary catheter 4. The medical staff grasped the primary handle 3 on the primary guide sleeve 2 and tilted it about 45 degrees from the scaphoid tubercle to the dorsal and ulnar sides, so that the sharp distal end of the primary catheter 1 could be punctured into the affected limb. The long axis of the primary catheter 1 was consistent with the long axis of the bone and perpendicular to the fracture line. The sharp distal end pierced into the scaphoid bone and was fixed to the scaphoid bone. After satisfactory positioning was confirmed under fluoroscopy, the primary catheter 1, as a soft tissue protective sleeve, assisted the 1.0 mm diameter guide needle to enter the primary catheter 1 through the primary guide sleeve 2 and into the scaphoid bone of the wrist.
[0039] After confirming satisfactory guide pin placement via fluoroscopy, remove primary catheter 1. Then, grasp the secondary handle 6 on the secondary insertion sleeve 5 to stably control the secondary catheter 4, positioning it outside the guide pin. The sharp distal end of the secondary catheter 4 punctures the affected limb and enters the scaphoid bone of the wrist. Subsequently, control the hollow drill rod with a diameter of 1.2-1.5 mm, positioning it outside the guide pin and inside the secondary catheter 4. The secondary catheter 4 reduces the possibility of the hollow drill rod breaking within the patient's body, improving the safety of the procedure.
[0040] Fluoroscopy is used to determine the drilling depth and position. A dedicated hollow drill bit is used, preferably a power drill, and a low-speed power drill is best. Ringer's solution is used for flushing to reduce heat damage to the bone during drilling. After drilling 2-4 mm into the proximal subcortical region, the hollow drill and secondary guide 4 are removed. Based on the patient's scaphoid bone, a Herbert screw of appropriate length is selected. The 2.5 mm diameter Herbert hollow compression screw is manually screwed in along the guide pin. The threaded portion of the screw tip must completely extend beyond the fracture line to complete the compression of the fracture end. Before tightening the Herbert screw, the guide pin is removed to ensure that the tail of the Herbert screw is completely embedded under the bone and that the distal thread completely extends beyond the fracture line. The final position of the Herbert screw is checked, and the stability of the scaphoid bone is determined under fluoroscopy.
[0041] After the surgery, the removed secondary catheter 4 is inserted into the primary catheter 1, the primary inlet sleeve 2 is nested on the outside of the secondary inlet sleeve 5, and the secondary handle 6 is connected to the primary inlet sleeve 2 by a slot 7 for easy disposal by medical staff.
[0042] The above-described specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications, substitutions, and improvements made by those skilled in the art to the technical solutions of the present invention based on the provided description and drawings, without departing from the design concept and spirit of the present invention, should all fall within the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.
Claims
1. An auxiliary guide sleeve for scaphoid fracture treatment, characterized by, It includes a rigid primary catheter (1), the distal end of which has a sharp annular front, and the proximal end has an integral primary inlet sleeve (2) with a conical cross-section. Both the primary catheter (1) and the primary inlet sleeve (2) have hollow lumens and are open at both ends. The primary inlet sleeve (2) and the primary catheter (1) are arranged coaxially and are interconnected.
2. The auxiliary guide sleeve for treating a wrist navicular fracture according to claim 1, characterized in that, The primary catheter (1) has an inner diameter between 1.1 and 1.3 mm and a length between 49 and 51 mm.
3. The auxiliary guide sleeve for treating a wrist navicular fracture according to claim 1, characterized in that, The outer circumference of the primary inlet sleeve (2) is integrally provided with three primary handles (3). The three primary handles (3) are arranged in an array along the center line of the primary inlet sleeve (2). Each primary handle (3) has rounded chamfers on its upper and lower sides.
4. The auxiliary guide sleeve for treating a wrist navicular fracture according to claim 3, characterized in that, The primary catheter (1) is also provided with a secondary catheter (4). The distal end of the secondary catheter (4) has a sharp annular front, and the proximal end has an integral secondary inlet sleeve (5) with a conical cross-section. The secondary catheter (4) and the secondary inlet sleeve (5) have the same structure as the primary catheter (1) and the primary inlet sleeve (2).
5. The auxiliary guide sleeve for treating a wrist navicular fracture according to claim 4, characterized in that, The secondary catheter (4) has an inner diameter between 1.7 and 1.9 mm and a length between 49 and 51 mm. The secondary inlet sleeve (5) is smaller than the size of the primary inlet sleeve (2), and the primary inlet sleeve (2) is fitted over the primary inlet sleeve (2).
6. The auxiliary guide sleeve for treating a wrist navicular fracture according to claim 5, wherein The outer circumferential wall of the secondary inlet sleeve (5) has three secondary handles (6), which are arranged in an array along the center line of the primary inlet sleeve (2). Each handle has rounded chamfers on both the upper and lower sides.
7. The auxiliary guide sleeve for treating a wrist navicular fracture according to claim 6, characterized in that, The primary handle (3) and the secondary handle (6) are arranged alternately. The primary guide sleeve (2) is provided with several slots (7) that are adapted to the secondary handle (6). Each slot (7) corresponds to the secondary handle (6) one by one. The secondary handle (6) and the primary guide sleeve (2) are connected by the slots (7).