Catheter with adjustable bent far end

Abstract

The utility model provides a far-end-adjustable bent catheter, which relates to the technical field of medical instruments and comprises a handle, a sliding groove is arranged at the top of the handle, a deflector rod is slidably connected to the inner wall of the sliding groove, a Luer taper is embedded in one end of the handle, an inner tube is fixed on the side face of the Luer taper, an outer tube is nested on the surface of the inner tube, and the outer tube and the far end of the inner tube penetrate through the other end of the handle. Limiting structures are arranged at the far ends of the outer tube and the inner tube, the limiting structures are fixed to the far end of the outer tube or the far end of the inner tube and used for axially limiting the far end of the outer tube or the far end of the inner tube, limiting structure protrusions are arranged on the section of the near end of each limiting structure, and outer tube deformation grooves are formed in the surface of the outer tube in an array mode. The distance between the outer tube deformation grooves is gradually increased from the far end to the near end of the outer tube, the structure of the adjustable bending catheter is simplified, bending of the catheter with the small radius and the small size at the far end is achieved, stress gradient type bending of the bending section is achieved from the far end to the near end, and bending in any direction is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable production equipment, in particular to a distally adjustable curved conduit. Background Art

[0002] Since the first intraoperative cerebral angiography in 1927, the treatment of various head and neck lesions has undergone revolutionary changes with the intervention of endovascular surgery, namely the treatment of aneurysms, arteriosclerosis, stroke, etc. The catheter is introduced into the vascular system through a small incision in the skin, which can enter the pathological area of ​​the neurovascular system and deliver other medical devices or therapeutic drugs through the catheter lumen for responsive treatment. Through these minimally invasive surgeries, patients can benefit from faster and more effective recovery time and less discomfort.

[0003] Existing medical device consumables with adjustable bending structures mainly include endoscopes, adjustable sheaths, and adjustable cardiac interventional catheters. Their bending and adjusting structures are mostly composed of cut-type hypotubes, snake bones, and traction wires, and the traction wires need to be combined with the sheaths and fixed to the supporting catheter body. This also results in the tube bodies of products using related technologies not being soft enough, and the product sizes being too large to be used in intravascular interventions. Similar disposable devices using this technology have low reliability and are prone to problems such as traction wire breakage or failure of the connection between the traction wire and the hypotube in clinical practice, which brings clinical limitations.

[0004] Today, vascular interventional surgery mainly focuses on three aspects: vascular stenosis, vascular blockage, and vascular access. For vascular access, such as intravascular access superselection and intravascular aneurysm treatment, it is often necessary to use a guidewire and a catheter in coordination, including pre-shaping of the guidewire and catheter tip, twisting and advancing the guidewire, and coordinating with the catheter to achieve the selective advancement of small-angle vascular branches and aneurysms. This traditional surgical method can already perform surgical treatment on easy-to-operate lesions, but it is difficult to achieve for more complex areas. At the same time, the operation is complicated, resulting in a long operation time. Repetitive twisting and pushing to adjust the distal angle of the instrument can also easily cause patient injury. In the field of cardiovascular and neurointerventional treatment, it is extremely important that the distal end of the treatment catheter can be adjusted in real time according to clinical conditions for a variety of vascular types and complex lesions.

[0005] The publicly applied patent CN117339081A, a multi-directional adjustable bend microcatheter and its manufacturing method, provides a manufacturing method for a multi-directional bend microcatheter. Its limiting bead structure is too complex in structure and process for microcatheter products with a size of less than 1 mm. It is not processable and is not afraid of assembly feasibility. The method structure is suitable for large-size industrial products, but not suitable for the medical field. Utility Model Content

[0006] The purpose of the present utility model is to solve the deficiencies existing in the prior art, and to propose a distal adjustable bending catheter.

[0007] To achieve the above object, the present utility model adopts the following technical solution: a distal adjustable bending catheter, including a handle, a chute is opened at the top of the handle, a lever is slidably connected to the inner wall of the chute, a luer connector is embedded at one end of the handle, and an inner tube is fixed to the side of the luer connector. The surface of the inner tube is nested with an outer tube, and the proximal end of the outer tube is fixed to the bottom of the lever. The distal ends of the outer tube and the inner tube pass through the other end of the handle, and a limiting structure is provided at the distal ends of the outer tube and the inner tube. The limiting structure is fixed to the distal end of the outer tube or the distal end of the inner tube, and the distal end face of the limiting structure is flush with the distal end face of the outer tube or the distal end face of the inner tube. The limiting structure is used for axially limiting the distal end of the outer tube or the distal end of the inner tube. The proximal cross-section of the limiting structure is provided with a limiting structure protrusion, and the limiting structure protrusion contacts the distal end face of the inner tube or the distal end face of the outer tube.

[0008] Preferably, if the limiting structure is fixed to the distal end of the outer tube, the inner tube is set as an axially movable catheter. The distal end face of the limiting structure is flush with the distal end face of the outer tube, and the limiting structure protrusion contacts the distal end face of the inner tube. The distance between the limiting structure protrusion and the axis of the inner tube is not less than the outer diameter of the inner tube.

[0009] Preferably, if the limiting structure is fixed to the distal end of the inner tube, the outer tube is set as an axially movable catheter. The distal end face of the limiting structure is flush with the distal end face of the inner tube, and the limiting structure protrusion contacts the distal end face of the outer tube. The distance between the limiting structure protrusion and the axis of the outer tube is not less than the inner diameter of the outer tube.

[0010] Preferably, if the outer tube is set as a double-layer U-shaped tube structure, the outer tube is set as an axially movable catheter. The distal ends of the inner and outer layers of the outer tube are connected to form a limiting structure, and the inner tube is arranged between the inner and outer layers of the outer tube.

[0011] Preferably, both the inner tube and the outer tube are made of a polymer material or a metal alloy.

[0012] Preferably, the elastic modulus of the inner tube itself is greater than the elastic modulus of the outer tube itself. The outer tube surface is arrayed with outer tube deformation grooves, and the depth of the outer tube deformation grooves is greater than the radius of the outer tube. The inner tube surface is arrayed with inner tube deformation grooves, and the depth of the inner tube is greater than the radius of the inner tube, and the distance between adjacent inner tube deformation grooves is less than the distance between the corresponding adjacent outer tube deformation grooves.

[0013] Preferably, the limiting structure is set as an annular structure.

[0014] Preferably, the distance between the outer tube deformation grooves gradually increases from the distal end to the proximal end of the outer tube, and the distance between the inner tube deformation grooves gradually increases from the distal end to the proximal end of the inner tube.

[0015] Beneficial effects

[0016] 1. In the present utility model, a more efficient vascular intervention method is provided for vascular intervention surgery, improving the surgical efficiency, reducing the surgical duration, and simplifying the structure of the steerable catheter. When the catheter is inserted, proximal twisting and pushing can achieve good torque transmission to the distal bending section, enabling timely synchronous adjustment of the operation at the distal end of the catheter. The distal end of the catheter can achieve distal bending of a small-radius and small-size catheter, and can be bent at a narrow site. This structure is not only simple and easy to manufacture, reducing the product assembly difficulty, but also, under the condition of the same inner diameter of the same size, reducing the wall thickness of the catheter, avoiding the use of the traction wire structure, having a stable stress structure, reducing the risk of breakage of the traction wire structure, and realizing a stress-gradual bending from the distal end to the proximal end of the bending section, achieving bending in any direction. Brief description of the drawings

[0017] Figure 1 It is a cross-sectional view of the handle of the present utility model;

[0018] Figure 2 It is a three-dimensional structure schematic diagram of the present utility model;

[0019] Figure 3 It is a three-dimensional structure schematic diagram of the present utility model when the limiting structure is fixed to the outer tube;

[0020] Figure 4 It is a three-dimensional structure schematic diagram of the inner and outer tubes of the present utility model when the limiting structure is fixed to the outer tube;

[0021] Figure 5 It is a three-dimensional structure schematic diagram of the present utility model when the limiting structure is fixed to the inner tube;

[0022] Figure 6 It is a three-dimensional structure schematic diagram of the inner tube and the limiting structure of the present utility model when the limiting structure is fixed to the inner tube;

[0023] Figure 7 It is a partial schematic diagram of the present utility model when the limiting structure is fixed to the inner tube;

[0024] Figure 8 It is a schematic diagram of the center of the curved configuration of the tube body of the present utility model;

[0025] Figure 9 It is a force diagram of the present utility model when the limiting structure is fixed to the inner tube;

[0026] Figure 10 It is a schematic diagram of the center of the configuration of the tube body after further bending and displacement of the present utility model;

[0027] Figure 11 It is a force diagram of the tube body of the present utility model after further bending;

[0028] Figure 12 Schematic diagram of the outer tube of the present utility model being a U-shaped tube;

[0029] Figure 13 Schematic diagram of the limiting structure when the outer tube of the present utility model is a U-shaped tube.

[0030] Legend:

[0031] 102, inner tube; 202, outer tube; 302, limiting structure; 303, raised portion of the limiting structure; 401, inner tube deformation groove; 500, handle; 501, outer tube deformation groove; 501, distal end of the tube body; 503, lever. Specific embodiments

[0032] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the following combines specific embodiments and drawings to further elaborate the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0033] The following describes the specific embodiments of the present utility model with reference to the drawings. Specific embodiment:

[0035] As Figures 1 to 4 shown, the embodiment of the present utility model provides a catheter with adjustable bending at the end, which is composed of an axially movable inner tube 102 and an outer tube 202. The outer diameter of the inner tube 102 is 0.03 mm smaller than the inner diameter of the outer tube 202. A limiting structure 302 is provided at the distal end of the outer tube 202, which is an annular structure with a length of 1 mm and is fixed to the distal end of the outer tube 202 by laser welding or bonding. The inner diameter of the limiting structure 302 is 0.04 mm smaller than the inner diameter of the axially movable inner tube 102. The distal end of the limiting structure 302 is flush with the distal end of the outer tube 202, and a raised point of the limiting structure is provided at the proximal cross-section to contact the distal cross-section of the inner tube 102. The outer tube 202 is composed of one of alloys such as NITI alloy or stainless steel alloy, and an inner tube deformation groove 401 is processed by laser cutting. The distance between the inner tube deformation grooves 401 gradually increases from the distal end to the proximal end. The inner tube 102 is composed of one of metal materials such as NITI alloy or stainless steel, and an outer tube deformation groove 501 is processed by laser cutting. The distance between the outer tube deformation grooves 501 gradually increases from the distal end to the proximal end, and the distance between adjacent inner tube deformation grooves 401 is smaller than the distance between the corresponding adjacent outer tube deformation grooves 501.

[0036] Embodiment 2:

[0037] As Figures 5 to 7As shown, an embodiment of the utility model provides a catheter with adjustable distal bend, which consists of an axially movable outer tube 202 and an inner tube 102, wherein the inner diameter of the outer tube 202 is 0.03 mm larger than the outer diameter of the inner tube 102, wherein the distal end of the inner tube 102 contains a limiting structure 302, and the limiting structure 302 is an annular structure with a length of 1 mm, and the distal end face of the limiting structure 302 is flush with the distal end face of the inner tube 102, and is fixed to the distal end of the inner tube 102 by epoxy resin adhesive, wherein the inner tube 102 is a NITI or stainless steel cut sea wave tube, and the elastic modulus of the inner tube 102 itself is greater than the elastic modulus of the outer tube 202 itself, and the limiting structure 302 is formed by laser cutting of a tube body with the same inner diameter and outer diameter as the outer tube 202, and the distal end of the limiting structure 302 is flush with the distal end face of the inner tube 102, and the proximal section of the limiting structure 302 is arranged by a convex point of the limiting structure so that it can contact the distal section of the outer tube 202. The outer tube 202 is made of one of the alloys such as NITI alloy or stainless steel alloy, and the deformation grooves 501 are processed by laser cutting. The deformation grooves 501 are arranged in an array with gradually increasing spacing from the distal end to the proximal end.

[0038] like Figure 1 As shown, the middle part of the handle contains a lever 503 which is bonded and fixed to the proximal end of the outer tube 202, so that it can slide axially relative to the handle 500, and the inner tube 102 is connected and fixed to the Luer connector at one end of the handle 500. The lever 503 is pushed to apply a force F to drive the outer tube 202 to move axially, so that the distal section of the outer tube 202 contacts the limiting structure protrusion 303, thereby bending the distal end 501 of the tube body.

[0039] like Figure 9 As shown, the bending structure is subjected to the proximal inner tube tension F or the outer tube tension F' (F and F' are interaction forces), which is transmitted to the limiting structure protrusion 303, and the distal axial transmission component force F1 causes the distal first section outer tube deformation groove 501 to deform and close to the proximal end, and the second section deformation groove is further deformed by the axial component force F2, as shown in FIG. Figure 8 As shown, it is bent into an arc configuration under the influence of the axial force components F1, F2, and F3, the center of the arc is 03, and the corresponding force components pointing to the center 03 are F1", F2", and F3";

[0040] like Figures 10 to 11As shown, after further bending, the end faces of both sides of the deformation groove are in contact, and the bending section is deformed under the action of the force F4 transmitted at the contact point of the fourth deformation groove, and the center of the arc further approaches the force-applying end, i.e., the distal end O4. The corresponding force components pointing to the center of the circle are F1", F2", F3", and F4", among which the proximal tensile force F=F'=F1+F2+F3+F4, and F' and F1" are respectively the proximal force component F1 that causes the first section of the deformation groove to shrink, the material to deform, and the force that causes the bending section to shrink toward the center of the circle. Similarly, after the force F is applied to the proximal end of the deformation groove, the distal end face of the outer tube 202 contacts the proximal limiting structure protrusion of the limiting structure 302 fixed on the inner tube 102, and then gradually deforms to trigger the shrinkage and bending.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A distal adjustable curved catheter, characterized in that: The invention comprises a handle (500), wherein a slide groove is provided at the top of the handle (500), and a lever (503) is slidably connected to the inner wall of the slide groove, a Luer connector is embedded in one end of the handle (500), and an inner tube (102) is fixed to the side of the Luer connector, an outer tube (202) is embedded in the surface of the inner tube (102), and the proximal end of the outer tube (202) is fixed to the bottom of the lever (503), and the distal ends of the outer tube (202) and the inner tube (102) pass through the other end of the handle (500), and a limiting structure (303) is provided at the distal ends of the outer tube (202) and the inner tube (102). 02), the limiting structure (302) is fixed to the distal end of the outer tube (202) or the distal end of the inner tube (102), and the distal end face of the limiting structure (302) is flush with the distal end face of the outer tube (202) or the distal end face of the inner tube (102), the limiting structure (302) is used to axially limit the distal end of the outer tube (202) or the distal end of the inner tube (102), and the proximal cross-section of the limiting structure (302) is provided with a limiting structure protrusion (303), and the limiting structure protrusion (303) is in contact with the distal end face of the inner tube (102) or the distal end face of the outer tube (202).

2. The distal adjustable bend catheter according to claim 1, characterized in that: If the limiting structure (302) is fixed to the distal end of the outer tube (202), the inner tube (102) is configured as an axially movable catheter, the distal end surface of the limiting structure (302) is flush with the distal end surface of the outer tube (202), and the limiting structure protrusion (303) is in contact with the distal end surface of the inner tube (102), and the axial distance between the limiting structure protrusion (303) and the inner tube (102) is not less than the outer diameter of the inner tube (102).

3. The distal adjustable bend catheter according to claim 1, characterized in that: If the limiting structure (302) is fixed to the distal end of the inner tube (102), the outer tube (202) is configured as an axially movable catheter, the distal end surface of the limiting structure (302) is flush with the distal end surface of the inner tube (102), and the limiting structure protrusion (303) is in contact with the distal end surface of the outer tube (202), and the axial distance between the limiting structure protrusion (303) and the outer tube (202) is not less than the inner diameter of the outer tube (202).

4. The distal adjustable bend catheter according to claim 1, characterized in that: If the outer tube (202) is configured as a double-layer U-shaped tube structure, the outer tube (202) is configured as an axially movable catheter, the inner and outer layers of the outer tube (202) are connected at their distal ends to form a limiting structure (302), and the inner tube (102) is disposed between the inner and outer layers of the outer tube (202).

5. The distal adjustable bend catheter according to claim 1, characterized in that: The inner tube (102) and the outer tube (202) are both made of polymer materials or metal alloys.

6. The distal adjustable bend catheter according to claim 1, characterized in that: The elastic modulus of the inner tube (102) is greater than that of the outer tube (202); an array of outer tube deformation grooves (501) is provided on the surface of the outer tube (202); the depth of the outer tube deformation grooves (501) is greater than the radius of the outer tube (202); an array of inner tube deformation grooves (401) is provided on the surface of the inner tube (102); the depth of the inner tube (102) is greater than the radius of the inner tube (102); and the spacing between adjacent inner tube deformation grooves (401) is smaller than the spacing between corresponding adjacent outer tube deformation grooves (501).

7. The distal adjustable bend catheter according to claim 1, characterized in that: The limiting structure (302) is configured as a ring-shaped structure.

8. The distal adjustable bend catheter according to claim 6, characterized in that: The outer tube deformation grooves (501) have a spacing that gradually increases from the distal end to the proximal end of the outer tube (202), and the inner tube deformation grooves (401) have a spacing that gradually increases from the distal end to the proximal end of the inner tube (102).

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