Multistage nested percutaneous puncture catheterization

Abstract

The utility model discloses a multistage nested percutaneous puncture catheterization, including hollow steel needle, be provided with the needle core of matched in hollow steel needle, the one end of hollow steel needle has the trumpet mouth, is provided with the sharp head in the other end, and the trumpet mouth department of hollow steel needle is provided with steel needle butt joint plate, the outer wall of hollow steel needle is equipped with multistage sleeve assembly, and multistage sleeve assembly includes a plurality of sleeve monomer that are in turn sleeved from inside to outside, one end of sleeve monomer is provided with sleeve butt joint plate, and the other end has the conical head, the sleeve butt joint plate of two sleeve monomers of adjacent sleeve is in turn butts, and the conical head of two sleeve monomers of adjacent sleeve is in turn transition link, and the both sides of sleeve monomer are provided with thin wall part, and sleeve monomer can tear from thin wall part under the action of external force. The utility model discloses percutaneous puncture catheterization integrates puncture needle and multistage sleeve, can realize step -by -step expansion and catheterization, can adapt to clinical routine small -bore drainage tube, also can effectively support the special drainage demand of bigger bore.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, specifically to a multi-level nested percutaneous catheter placement method. Background Technology

[0002] Percutaneous catheter placement is a routine procedure in interventional therapy. In clinical practice, physicians frequently need to insert catheters or drainage tubes percutaneously into lesions or target tissues for procedures such as aspiration, irrigation, or drainage. Traditional catheter placement methods typically rely on simple cannula puncture needles, with a guidewire inserted first, followed by the placement of the appropriate catheter. This procedure is cumbersome and lacks flexibility.

[0003] Currently, most puncture needles used in clinical practice are cannula needles, which can only pass through guidewires and employ a "two-step method." In existing techniques, commonly used puncture needles can only be used in conjunction with guidewires. The catheter placement procedure often requires first establishing a "channel" using the puncture needle / guidewire, and then using a dilator or other auxiliary devices to complete the drainage tube insertion. This "two-step method" not only involves numerous steps, but also often requires various sizes of dilators when dealing with larger diameter tubes, increasing the complexity of the procedure and potentially causing repeated trauma to the patient's tissues.

[0004] Currently, the largest percutaneous drainage tube used in clinical practice is 14F; even with a solid-channel dilator, placement remains challenging. While a 14F tube is sufficient for many routine drainage procedures, in complex cases, such as with viscous pus, necrotic material, or tissue fibrosis, even with a matching solid-channel dilator, successful placement of a 14F tube is difficult. Furthermore, when the lesion requires a larger diameter drainage tube, the procedure becomes completely impractical.

[0005] When a 14F drainage tube is still not thick enough, traditional placement methods are insufficient to meet drainage needs. For example, some patients with pancreatitis have a large amount of viscous fluid / necrotic material in their abdominal cavity or peripancreatic cavity. Conventional 14F drainage tubes are insufficient in terms of patency and drainage speed to meet treatment requirements, easily causing problems such as poor local drainage and tube blockage, thus affecting treatment outcomes. Although there is a clinical need for thicker tubes, limited operating space and high sinus tract resistance make placement procedures more difficult.

[0006] Surgical large-diameter drainage tubes or urinary catheters (up to 22F in diameter) provide good drainage, but their softness and difficulty in percutaneous insertion make them challenging. Larger diameter 22F drainage tubes typically significantly improve drainage speed and reduce the probability of occlusion. However, these tubes are often made of soft materials and lack sufficient support. Direct percutaneous insertion can easily fail due to excessive tissue pressure or sinus tract resistance, thus hindering effective percutaneous drainage. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a multi-level nested percutaneous puncture catheter placement solution. This percutaneous puncture catheter placement solution integrates a puncture needle and a multi-level sleeve, which can achieve step-by-step expansion and catheter placement under the conditions of "one-step method" or "guidewire guidance". It can be adapted to the clinical routine small-diameter drainage tubes and can also effectively support the special drainage needs of larger diameter tubes.

[0008] To achieve the above objectives, the present invention provides a multi-level nested percutaneous catheter placement device, comprising a hollow steel needle, wherein a matching needle core is provided inside the hollow steel needle, one end of the hollow steel needle has a flared mouth, the other end of the hollow steel needle has a pointed tip, and a steel needle abutment plate is provided at the flared mouth of the hollow steel needle.

[0009] The hollow steel needle is fitted with a multi-stage sleeve assembly on its outer wall. The multi-stage sleeve assembly includes multiple sleeve units that are sequentially fitted from the inside to the outside. One end of each sleeve unit is provided with a sleeve abutment plate, and the other end of each sleeve unit has a conical head.

[0010] The sleeve abutment plates of two adjacent sleeve units abut against each other in sequence, and the sleeve abutment plate of the innermost sleeve unit abuts against the steel needle abutment plate; the conical heads of two adjacent sleeve units are sequentially connected, and the diameter of the conical head of the sleeve unit gradually decreases from the outermost ring to the innermost ring.

[0011] The sleeve unit has thin-walled portions on both sides, and the sleeve unit can be torn from the thin-walled portions under the action of external force.

[0012] Furthermore, the thin-walled portion is provided with a toothed line for guiding the tearing direction, and the end of the toothed line is provided with a reserved notch.

[0013] Furthermore, the sleeve abutment plate is provided with a boss and / or a groove, and adjacent sleeve abutment plates are provided with a groove that matches the boss and / or a boss that matches the groove; the two adjacent sleeve abutment plates are positioned by the cooperation of the boss and the groove.

[0014] Furthermore, the inner wall and / or inner wall of the sleeve unit is coated with a lubricating layer.

[0015] Furthermore, the steel needle abutment plate and the sleeve abutment plate are circular or elliptical.

[0016] Furthermore, the outer wall of the sleeve unit is provided with scale lines arranged along its length.

[0017] Furthermore, the multi-stage sleeve assembly includes a first sleeve body, a second sleeve body, a third sleeve body, a fourth sleeve body, a fifth sleeve body, a sixth sleeve body, and a seventh sleeve body, which are sequentially sleeved from the inside out.

[0018] The lengths of the first sleeve body, the second sleeve body, the third sleeve body, the fourth sleeve body, the fifth sleeve body, the sixth sleeve body, and the seventh sleeve body decrease sequentially.

[0019] Further, the inner diameter of the first sleeve body is 1.3-1.6 mm and the thickness is 1-1.3 mm; the inner diameter of the second sleeve body is 3.5-3.8 mm and the thickness is 0.4-0.7 mm; the inner diameter of the third sleeve body is 4.5-4.8 mm and the thickness is 0.4-0.7 mm; the inner diameter of the fourth sleeve body is 5.5-5.8 mm and the thickness is 0.4-0.7 mm; the inner diameter of the fifth sleeve body is 6.5-6.8 mm and the thickness is 0.4-0.7 mm; the inner diameter of the sixth sleeve body is 7.5-7.8 mm and the thickness is 0.25-0.55 mm; and the inner diameter of the seventh sleeve body is 8.2-8.5 mm and the thickness is 0.25-0.55 mm.

[0020] Furthermore, the first sleeve body has an inner diameter of 1.3 mm and a thickness of 1 mm; the second sleeve body has an inner diameter of 3.5 mm and a thickness of 0.4 mm; the third sleeve body has an inner diameter of 4.5 mm and a thickness of 0.4 mm; the fourth sleeve body has an inner diameter of 5.5 mm and a thickness of 0.4 mm; the fifth sleeve body has an inner diameter of 6.5 mm and a thickness of 0.4 mm; the sixth sleeve body has an inner diameter of 7.5 mm and a thickness of 0.25 mm; and the seventh sleeve body has an inner diameter of 8.2 mm and a thickness of 0.25 mm.

[0021] Furthermore, the hollow steel needle has an inner diameter of 1.0 mm and a thickness of 0.1 mm; the needle core has a diameter of 1.0 mm.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] Firstly, this utility model integrates a multi-level nested percutaneous puncture catheterization needle and a multi-level sleeve, combining puncture and dilation functions. Based on the traditional hollow puncture needle, this utility model adds a multi-level nested sleeve structure. Doctors can first use the hollow needle with the needle core to complete the puncture positioning. After reaching the target, the needle core is removed. Then, according to the required tube diameter, the appropriate sleeve combination is selected for dilation or direct placement. The multi-level sleeves adopt an inner and outer nesting form, which can reduce the operation steps and enable puncture and dilation to be achieved simultaneously.

[0024] Secondly, the multi-level nested percutaneous catheter placement of this utility model can be used as a step-by-step dilator, with flexible options for either a one-step method or guidewire guidance. One-step method: For some experienced operators or patients with suitable conditions, unnecessary sleeves can be removed step by step by external force after puncture, leaving a sleeve channel with the required inner diameter, so as to quickly insert a drainage tube of the corresponding specification. Guidewire guidance: When the puncture is deep or the lesion site is complex, a guidewire can be inserted first according to the traditional method to ensure accurate channel, and then the multi-level sleeve of this utility model can be used to achieve smooth dilation.

[0025] Thirdly, the multi-level nested percutaneous catheter placement of this utility model adopts a tear-resistant sleeve design: it has serrations and can be torn from the side wall for easy removal. Each sleeve unit is provided with a tearable thin-walled section, and the inner or outer side is designed with a serrated structure. After clinical catheter placement, if it is necessary to retain a larger drainage tube (such as a special tube with a bulging part at the rear end), the outer sleeve can be torn open and removed along the preset serrations or thin wall, so as not to affect the placement and use of the larger diameter drainage tube at the rear end in the body.

[0026] Fourth, the multi-level nested percutaneous catheter placement of this invention can be adapted to drainage tubes of different diameters, covering the needs from 14F to 22F. By pre-configuring the inner diameter of the multi-level sleeves (e.g., from 1.3mm to 8.5mm), and by selecting the appropriate number and diameter of sleeves to retain according to clinical needs, this invention can cover large-diameter tubes from 14F to even 22F. Furthermore, this structure is also compatible with thinner or special-specification catheters.

[0027] Fifth, the multi-level nested percutaneous catheter placement technique reduces tissue trauma and improves placement efficiency. The nested design of the multi-level sleeve allows for progressive dilation within a single puncture path, avoiding repeated punctures or changes in dilators. This ensures operational effectiveness while reducing damage to surrounding tissues, lowering the risk of bleeding, and minimizing surgical complications. Simultaneously, it effectively shortens surgical time, enhances the surgeon's flexibility, and improves patient safety. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a multi-level nested percutaneous catheter placement structure;

[0029] Figure 2 A schematic diagram of a multi-level nested percutaneous catheter placement structure;

[0030] Figure 3 This is a schematic diagram of the structure of a hollow steel needle;

[0031] Figure 4 This is a schematic diagram of the needle core structure;

[0032] Figure 5 This is a schematic diagram of the thin-walled section on the sleeve unit.

[0033] Figure 6 This is a structural diagram of the boss and groove of the sleeve abutment plate;

[0034] In the diagram: 1. Hollow steel needle, 1.1. Trumpet mouth, 1.2. Steel needle abutment plate, 1.3. Needle core, 2. Sleeve unit, 3.1. First sleeve body, 3.2. Second sleeve body, 3.3. Third sleeve body, 3.4. Fourth sleeve body, 3.5. Fifth sleeve body, 3.6. Sixth sleeve body, 3.7. Seventh sleeve body, 4. Sleeve abutment plate, 4.1. Boss, 4.2. Groove, 5. Conical head, 6. Thin-walled part, 6. Reserved notch. Detailed Implementation

[0035] The following examples illustrate the implementation of this utility model in detail, but they do not constitute a limitation on this utility model and are merely illustrative. Furthermore, explaining the advantages of this utility model will make it clearer and easier to understand.

[0036] like Figures 1-4 The multi-stage nested percutaneous catheter placement shown includes a hollow steel needle 1, with a matching needle core 2 inside the hollow steel needle 1. One end of the hollow steel needle 1 has a flared opening 1.1, and the other end has a pointed tip 1.2. A steel needle abutment plate 1.3 is provided at the flared opening 1.1 of the hollow steel needle 1. A multi-stage sleeve assembly is fitted on the outer wall of the hollow steel needle 1. The multi-stage sleeve assembly includes multiple sleeve units 3 that are sequentially nested from the inside to the outside. One end of each sleeve unit 3 has a sleeve abutment plate 4, and the other end of each sleeve unit 3 has a conical head 5. The sleeve abutment plates 4 of two adjacent sleeve units 3 abut against each other in sequence. The sleeve abutment plate 4 of the innermost sleeve unit 3 abuts against the steel needle abutment plate 1.3. The conical heads 5 of two adjacent sleeve units 3 are sequentially transitioned and connected, and the diameter of the conical head 5 of the sleeve unit 3 gradually decreases from the outermost circle to the innermost circle. The steel needle abutment plate 1.3 and the sleeve abutment plate 4 are circular or elliptical. The outer wall of the sleeve unit 3 is provided with scale lines arranged along its length, so that the operator can clearly know the needle depth under real-time ultrasound / CT observation, which is convenient for precise positioning.

[0037] like Figure 2As shown, the multi-stage sleeve assembly includes a first sleeve body 3.1, a second sleeve body 3.2, a third sleeve body 3.3, a fourth sleeve body 3.4, a fifth sleeve body 3.5, a sixth sleeve body 3.6, and a seventh sleeve body 3.7, which are sequentially sleeved from the inside out; the lengths of the first sleeve body 3.1, the second sleeve body 3.2, the third sleeve body 3.3, the fourth sleeve body 3.4, the fifth sleeve body 3.5, the sixth sleeve body 3.6, and the seventh sleeve body 3.7 decrease sequentially. The inner diameter of the first sleeve body 3.1 is 1.3-1.6 mm, and the thickness is 1-1.3 mm; the inner diameter of the second sleeve body 3.2 is 3.5-3.8 mm, and the thickness is 0.4-0.7 mm; the inner diameter of the third sleeve body 3.3 is 4.5-4.8 mm, and the thickness is 0.4-0.7 mm; the inner diameter of the fourth sleeve body 3.4 is 5.5-5.8 mm, and the thickness is 0.4-0.7 mm; the inner diameter of the fifth sleeve body 3.5 is 6.5-6.8 mm, and the thickness is 0.4-0.7 mm; the inner diameter of the sixth sleeve body 3.6 is 7.5-7.8 mm, and the thickness is 0.25-0.55 mm; the inner diameter of the seventh sleeve body 3.7 is 8.2-8.5 mm, and the thickness is 0.25-0.55 mm.

[0038] Preferably, the hollow steel needle 1 has an inner diameter of 1.0 mm and a thickness of 0.1 mm; the needle core 2 has a diameter of 1.0 mm. The first sleeve body 3.1 has an inner diameter of 1.3 mm and a thickness of 1 mm; the second sleeve body 3.2 has an inner diameter of 3.5 mm and a thickness of 0.4 mm; the third sleeve body 3.3 has an inner diameter of 4.5 mm and a thickness of 0.4 mm; the fourth sleeve body 3.4 has an inner diameter of 5.5 mm and a thickness of 0.4 mm; the fifth sleeve body 3.5 has an inner diameter of 6.5 mm and a thickness of 0.4 mm; the sixth sleeve body 3.6 has an inner diameter of 7.5 mm and a thickness of 0.25 mm; and the seventh sleeve body 3.7 has an inner diameter of 8.2 mm and a thickness of 0.25 mm.

[0039] like Figure 5 As shown, the sleeve unit 3 has thin-walled portions 6 on both sides, allowing it to tear under external force. The thin-walled portions 6 have serrated lines to guide the tearing direction, with pre-reserved notches 6.1 at their ends. The inner wall and / or inner wall of the sleeve unit 3 are coated with a lubricating layer. Applying a low-friction coefficient lubricating layer (such as a hydrophilic coating or silicone treatment) to the outer and inner walls of the sleeve unit reduces friction between multiple layers and with tissue, making insertion and withdrawal smoother. A small amount of silicone oil or a non-adhesive coating can also be used between the needle core and the inner wall of the hollow steel needle to ensure smooth needle core withdrawal without jamming due to blood or body fluid adhesion.

[0040] like Figure 6As shown, in a preferred embodiment, the sleeve abutment plate 4 is provided with a boss 4.1 and / or a groove 4.2, and adjacent sleeve abutment plates 4 are provided with grooves 4.2 that match the boss 4.1 and / or bosses 4.1 that match the grooves 4.2; the two adjacent sleeve abutment plates 4 are positioned by the engagement of the boss 4.1 and the groove 4.2. The boss 4.1 and the groove 4.2 disengage under external force (such as slight rotation or pressing), eliminating the need for additional tools and minimizing the difficulty of operation.

[0041] This utility model of multi-stage nested percutaneous catheter placement integrates a puncture needle and multi-stage sleeves. The sleeve combination can be selected according to the intended drainage tube, and it can also be used as a step-by-step dilator. After one-step puncture or guided by a guidewire to the target, the inner core is withdrawn, retaining the corresponding sleeve body, and different specifications of drainage tubes are directly inserted through the sleeve body. The sleeve is designed with serrations, and after the drainage tube is inserted, the sleeve body can be torn in half and withdrawn without affecting the use of the enlarged drainage tube at the tail end.

[0042] The above are merely specific embodiments of this utility model. It should be noted that any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Any other aspects not described in detail are prior art.

Claims

1. A multi-level nested percutaneous catheter placement method, characterized in that: Includes a hollow steel needle (1), a matching needle core (2) is provided inside the hollow steel needle (1), one end of the hollow steel needle (1) has a flared mouth (1.1), the other end of the hollow steel needle (1) has a pointed tip (1.2), and a steel needle abutment plate (1.3) is provided at the flared mouth (1.1) of the hollow steel needle (1); The hollow steel needle (1) is fitted with a multi-stage sleeve assembly on its outer wall. The multi-stage sleeve assembly includes multiple sleeve units (3) that are sequentially fitted from the inside to the outside. One end of each sleeve unit (3) is provided with a sleeve abutment plate (4), and the other end of each sleeve unit (3) has a conical head (5). The sleeve abutting plates (4) of two adjacent sleeve units (3) abut against each other in sequence, and the sleeve abutting plate (4) of the innermost sleeve unit (3) abuts against the steel needle abutting plate (1.3); the conical heads (5) of two adjacent sleeve units (3) are sequentially connected, and the diameter of the conical head (5) of the sleeve unit (3) gradually decreases from the outermost circle to the innermost circle; The sleeve unit (3) has thin-walled portions (6) on both sides, and the sleeve unit (3) can be torn from the thin-walled portions (6) under the action of external force.

2. The multi-level nested percutaneous catheter placement according to claim 1, characterized in that: The thin-walled portion (6) is provided with a toothed line for guiding the tearing direction, and the end of the toothed line is provided with a reserved notch (6.1).

3. The multi-level nested percutaneous catheter placement according to claim 1, characterized in that: The sleeve abutment plate (4) is provided with a boss and / or a groove, and the adjacent sleeve abutment plate (4) is provided with a groove that matches the boss and / or a boss that matches the groove; the two adjacent sleeve abutment plates (4) are positioned by the cooperation of the boss and the groove.

4. The multi-level nested percutaneous catheter placement according to claim 1, 2, or 3, characterized in that: The inner wall and / or inner wall of the sleeve unit (3) is coated with a lubricating layer.

5. The multi-level nested percutaneous catheter placement according to claim 1, 2, or 3, characterized in that: The steel needle abutment plate (1.3) and the sleeve abutment plate (4) are circular or elliptical.

6. The multi-level nested percutaneous catheter placement according to claim 1, 2, or 3, characterized in that: The outer wall of the sleeve unit (3) is provided with scale lines arranged along its length.

7. The multi-level nested percutaneous catheter placement according to claim 1, 2, or 3, characterized in that: The multi-stage sleeve assembly includes a first sleeve body (3.1), a second sleeve body (3.2), a third sleeve body (3.3), a fourth sleeve body (3.4), a fifth sleeve body (3.5), a sixth sleeve body (3.6), and a seventh sleeve body (3.7) that are sequentially sleeved from the inside out. The lengths of the first sleeve body (3.1), the second sleeve body (3.2), the third sleeve body (3.3), the fourth sleeve body (3.4), the fifth sleeve body (3.5), the sixth sleeve body (3.6), and the seventh sleeve body (3.7) decrease sequentially.

8. The multi-level nested percutaneous catheter placement according to claim 7, characterized in that: The first sleeve body (3.1) has an inner diameter of 1.3-1.6 mm and a thickness of 1-1.3 mm; the second sleeve body (3.2) has an inner diameter of 3.5-3.8 mm and a thickness of 0.4-0.7 mm; the third sleeve body (3.3) has an inner diameter of 4.5-4.8 mm and a thickness of 0.4-0.7 mm; the fourth sleeve body (3.4) has an inner diameter of 5.5-5.8 mm and a thickness of 0.4-0.7 mm; the fifth sleeve body (3.5) has an inner diameter of 6.5-6.8 mm and a thickness of 0.4-0.7 mm; the sixth sleeve body (3.6) has an inner diameter of 7.5-7.8 mm and a thickness of 0.25-0.55 mm; and the seventh sleeve body (3.7) has an inner diameter of 8.2-8.5 mm and a thickness of 0.25-0.55 mm.

9. The multi-level nested percutaneous catheter placement according to claim 7, characterized in that: The first sleeve body (3.1) has an inner diameter of 1.3 mm and a thickness of 1 mm; the second sleeve body (3.2) has an inner diameter of 3.5 mm and a thickness of 0.4 mm; the third sleeve body (3.3) has an inner diameter of 4.5 mm and a thickness of 0.4 mm; the fourth sleeve body (3.4) has an inner diameter of 5.5 mm and a thickness of 0.4 mm; the fifth sleeve body (3.5) has an inner diameter of 6.5 mm and a thickness of 0.4 mm; the sixth sleeve body (3.6) has an inner diameter of 7.5 mm and a thickness of 0.25 mm; and the seventh sleeve body (3.7) has an inner diameter of 8.2 mm and a thickness of 0.25 mm.

10. The multi-level nested percutaneous catheter placement according to claim 1, 2, or 3, characterized in that: The hollow steel needle (1) has an inner diameter of 1.0 mm and a thickness of 0.1 mm; the needle core (2) has a diameter of 1.0 mm.

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