Diameter-variable retraction fixing catheter

Abstract

The invention discloses a variable-diameter retracting and fixing catheter which comprises a brake component, a guide sleeve and an expandable sheathing canal, and the brake component is in threaded connection with the outside of the guide sleeve; vacant positions are evenly distributed at the upper end of the guide sleeve, the expandable sheathing canal comprises supporting rods and a sleeve, the upper ends of the supporting rods are bent outwards and evenly distributed in the vacant positions, the upper sections of the supporting rods are rotationally connected with the guide sleeve through fixing pins, and the lower sections of the supporting rods are fixedly wrapped with the sleeve; an annular slope groove is formed in the inner side of the upper end of the brake component, and an annular boss is arranged in the middle of the upper end. The device is simple in structure and does not need a complex power device; through the application of the lever principle, the diameter changing process is stable and controllable, the expansion degree can be accurately adjusted according to the operation requirement, and target areas or diagnosis and treatment instruments of different sizes are adapted. Tissues around a target area can be noninvasively pushed and expanded, large-area incision or traction is not needed, damage to normal tissues is reduced, and operation safety and tolerance are improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and specifically to a variable diameter retraction and fixation catheter. Background Technology

[0002] Currently, the incidence of cerebrovascular diseases such as hypertensive intracerebral hemorrhage remains high and is showing an aging trend. These diseases are characterized by their rapid onset, high mortality rate, and high disability rate. Although endoscopic intracranial hematoma evacuation is an effective treatment, the limitations of traditional access methods have hindered the widespread adoption of this procedure. For example, some fixed access methods have a large puncture radius, making it impossible to observe the surrounding brain tissue and easily leading to puncture deviation and additional damage; some fixed access methods have an outer diameter of 20-22 mm, which can easily cause a sudden increase in intracranial pressure during insertion, increasing the surgical risk.

[0003] With advancements in medical technology, neurosurgery has gradually shifted from traditional open craniotomy to minimally invasive procedures. For common diseases such as brain tumors and hypertensive intracerebral hemorrhage, minimally invasive surgery reduces exposure and damage to normal brain tissue, shortens postoperative recovery time, and lowers the risk of complications such as infection and neurological deficits. Neuroendoscopic surgery, as one of the core procedures in minimally invasive neurosurgery, relies heavily on the rationality of its working channel for its surgical outcomes. Variable-diameter channels perfectly embody this concept, providing crucial technical equipment that offers better mechanical support for minimally invasive neurosurgery. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a variable diameter retraction and fixation catheter.

[0005] The specific plan is as follows: A variable-diameter retraction and fixing conduit includes a braking component, a guide sleeve, and an expandable sheath. Both the braking component and the guide sleeve are annular structures, with the braking component threaded onto the outside of the guide sleeve. The upper end of the guide sleeve has evenly distributed cavities along its circumference. The expandable sheath includes a support rod and a sleeve. The upper end of the support rod is bent outwards and evenly distributed along its circumference in the cavities of the guide sleeve. The upper section of the support rod is rotatably connected to the guide sleeve via a fixing pin. The sleeve is fixedly wrapped around the lower section of the support rod, with its upper end fixed below the fixing pin and its lower end folded inwards and fixed to the inner side of the lower end of the support rod. An annular inclined groove is formed on the inner side of the upper end of the braking component, and an annular boss is provided in the middle of the upper end. The inclined surface of the annular inclined groove is funnel-shaped, wider at the top and narrower at the bottom.

[0006] Furthermore, the support rod is composed of a bent section, an upper straight section, and a lower arc section arranged sequentially from top to bottom. The upper end of the bent section is inclined outward, the lower end of the upper straight section is provided with a pin hole for installing a fixing pin, and the lower arc section is an arc shape that bulges inward in the middle (which helps the doctor have a better field of vision when in the expanded state and facilitates the placement of the neuroendoscopy). The outer side of its upper end and the inner side of its lower end are respectively provided with crimping grooves for fixing the upper and lower ends of the cannula.

[0007] Furthermore, the bottom edge of the guide sleeve is symmetrically connected with extension blocks for handheld fixation.

[0008] Furthermore, the braking component is made of a biocompatible material, including but not limited to polytetrafluoroethylene (PTFE), polyurethane, and polyetheretherketone (PEEK).

[0009] Furthermore, the guide sleeve, support rod, and fixing pin are made of alloy or non-magnetic materials. The alloys include, but are not limited to, 304 / 316LV stainless steel, nickel-titanium alloy, cobalt-chromium-molybdenum alloy, and titanium alloy (some of which contain radiopaque materials such as gold, platinum, tungsten alloys, or non-magnetic materials suitable for MRI).

[0010] Furthermore, the sleeve is made of a biocompatible elastomer material.

[0011] The beneficial effects of this invention are as follows: 1. Simple structure, no need for complex power unit; 2. By applying the lever principle, the diameter change process is smooth and controllable, and the degree of expansion can be precisely adjusted according to surgical needs to adapt to target areas or diagnostic and treatment instruments of different sizes.

[0012] 3. It can non-invasively push and expand the tissues around the target area (such as the brain) without the need for large-area incision or traction, reducing damage to normal tissues, lowering the risk of postoperative bleeding, infection and other complications, and improving surgical safety and tolerability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention in the contracted state, wherein the upper convex shape is a perspective view and the lower shape is a top view.

[0014] Figure 2 This is a schematic diagram of the structure of the present invention in its expanded state, wherein the upper convex shape is a perspective view and the lower shape is a top view.

[0015] Figure 3 This is a cross-sectional view of the present invention in its contracted state.

[0016] Figure 4 This is a cross-sectional view of the present invention in its expanded state.

[0017] Figure 5 This is a cross-sectional view of the braking component in this invention.

[0018] Figure 6 This is an enlarged view of the lower end of the present invention.

[0019] Figure 7 This is a distribution diagram of the support rods in this invention.

[0020] List of reference numerals in the attached diagram: 1-Brake component, 2-Guide sleeve, 3-Expandable sheath, 4-Support rod, 5-Fixing pin, 6-Sleeve, 7-Bevel, 8-Annular boss, 9-Crimp groove, 10-Outer surface, 11-Inner surface, 12-Lower arc segment, 13-Pin hole, 14-Extension block. Detailed Implementation

[0021] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] like Figure 1 As shown, the present invention provides a variable diameter retraction and fixing conduit, comprising a braking component 1, a guide sleeve 2, and an expandable sheath 3. Both the braking component 1 and the guide sleeve 2 are annular structures, with the braking component 1 threadedly connected to the outside of the guide sleeve 2. The upper end of the guide sleeve 2 has evenly distributed cavities along its circumference. The expandable sheath 3 includes a support rod 4 and a sleeve 6. The upper end of the support rod 4 is bent outwards and evenly distributed along its circumference in the cavities of the guide sleeve 2. The upper section of the support rod 4 is rotatably connected to the guide sleeve 2 via a fixing pin 5. The sleeve 6 is fixedly covered over the lower section of the support rod 4, with its upper end fixed below the fixing pin 5 and its lower end folded inwards and fixed to the inner side of the lower end of the support rod 4. An annular inclined groove is formed on the inner side of the upper end of the braking component 1, and an annular boss 8 is provided in the middle of the upper end. The inclined surface 7 of the annular inclined groove is trumpet-shaped, wider at the top and narrower at the bottom.

[0023] In use, the braking component is in the form of a nut, rotating around the thread on the guide sleeve. When the braking component rotates counterclockwise, it moves upward relative to the guide sleeve, at which point its internal inclined surface fits against the upper outer surface 10 of the support rod, causing it to expand slowly. When the braking component rotates clockwise, it moves downward relative to the guide sleeve, and the internal boss of the braking component abuts against the upper inner surface 11 of the support rod, causing it to contract slowly, thereby controlling the expandable sheath.

[0024] Expandable sheaths can be designed to be inserted through body incisions, cavities, or similar sites to access target areas. For example, an expandable sheath can pass through an opening in the patient's head, through the skull, and into the brain to approach targets within the brain (such as lesions, blood clots, tumors, etc.). Furthermore, expandable sheaths can be placed inside the brain and non-invasively pushed, moved, or otherwise expanded to expand brain tissue near the target site, providing better visualization.

[0025] In this embodiment, the support rod 4 is composed of a bent section, an upper straight section, and a lower arc section 12 arranged sequentially from top to bottom. The upper end of the bent section is inclined outward, the lower end of the upper straight section is provided with a pin hole 13 for installing and fixing the pin 5, and the lower arc section is an arc shape that bulges inward in the middle (which helps the doctor to have a better field of vision when in the expanded state and facilitates the placement of the neuroendoscopy). The outer side of its upper end and the inner side of its lower end are respectively provided with crimping grooves 9 for fixing the upper and lower ends of the sleeve 6.

[0026] In this embodiment, the bottom edge of the guide sleeve 2 is symmetrically connected with an extension block 14 for handheld fixation.

[0027] In this embodiment, the braking component 1 is made of a biocompatible material, which includes, but is not limited to, polytetrafluoroethylene (PTFE), polyurethane, and polyetheretherketone (PEEK).

[0028] In this embodiment, the guide sleeve 2, support rod 4, and fixing pin 5 are made of alloy or non-magnetic materials. The alloys include, but are not limited to, 304 / 316LV stainless steel, nickel-titanium alloy, cobalt-chromium-molybdenum alloy, and titanium alloy (some of which contain radiopaque materials such as gold, platinum, tungsten alloys, or non-magnetic materials suitable for MRI).

[0029] In this embodiment, the sleeve 6 is made of a biocompatible elastomer material.

[0030] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A variable diameter retraction and fixation catheter, characterized in that, The device includes a braking component (1), a guide sleeve (2), and an expandable sheath (3). Both the braking component (1) and the guide sleeve (2) are annular structures, and the braking component (1) is threaded onto the outside of the guide sleeve (2). The upper end of the guide sleeve (2) has vacancy spaces evenly distributed along the circumferential direction. The expandable sheath (3) includes a support rod (4) and a sleeve (6). The upper end of the support rod (4) is bent outward and evenly distributed along the circumferential direction in the vacancy spaces of the guide sleeve (2). In the position, the upper section of the support rod (4) is rotatably connected to the guide sleeve (2) by a fixing pin (5), and the sleeve (6) is fixedly covered outside the lower section of the support rod (4). Its upper end is fixed below the fixing pin (5), and its lower end is folded inward and fixed to the inner side of the lower end of the support rod (4). The brake component (1) has an annular inclined groove on the inner side of its upper end, and an annular boss (8) is provided in the middle of its upper end. The inclined surface (7) of the annular inclined groove is a trumpet shape with a larger upper surface and a smaller lower surface.

2. The variable diameter retraction and fixation conduit according to claim 1, characterized in that, The support rod (4) is composed of a bent section, an upper straight section and a lower arc section (12) arranged sequentially from top to bottom. The upper end of the bent section is inclined outward, the lower end of the upper straight section is provided with a pin hole (13) for installing a fixing pin (5), and the lower arc section is an arc shape that protrudes inward in the middle. The outer side of its upper end and the inner side of its lower end are respectively provided with crimping grooves (9) for fixing the upper and lower ends of the sleeve (6).

3. The variable diameter retraction and fixation conduit according to claim 1, characterized in that, The bottom edge of the guide sleeve (2) is symmetrically connected with an extension block (14) for hand-held fixation.

4. The variable diameter retraction and fixation conduit according to claim 1, characterized in that, The braking component (1) is made of a biocompatible material, including but not limited to polytetrafluoroethylene (PTFE), polyurethane, and polyether ether ketone (PEEK).

5. The variable diameter retraction and fixation conduit according to claim 1, characterized in that, The guide sleeve (2), support rod (4), and fixing pin (5) are made of alloy or non-magnetic materials, including but not limited to 304 / 316LV stainless steel, nickel-titanium alloy, cobalt-chromium-molybdenum alloy, and titanium alloy.

6. The variable diameter retraction and fixation conduit according to claim 1, characterized in that, The sleeve (6) is made of a biocompatible elastomer material.

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