A disposable microcatheter

Abstract

The utility model discloses a kind of disposable microcatheter, including pipe guard, detachably connected with pipe seat on the pipe guard, and the pipe guard is provided with catheter structure at the end away from pipe seat, and the pipe seat is fixedly connected by connecting assembly;The connecting assembly includes the sliding sleeve rotationally connected with the pipe guard, and the sliding sleeve is rotationally connected with the lever by spring rotating shaft on it.The utility model in the present application, by setting connecting assembly, before the pipe seat is pressed on the pipe guard, first cut frame is screwed into the pipe guard, then catheter structure is inserted into sheath, catheter structure is cut using cutting knife, until the remaining length of catheter structure meets the operation demand, user rotates lever to make cutting knife cut catheter structure and abut with inner support pipe, then continue to stir lever to drive sliding sleeve to rotate, cut off the excess catheter structure, finally cut frame and the catheter structure after cutting are taken out, and pipe seat can be installed on the pipe guard.

Description

Technical Field

[0001] This utility model relates to the field of surgical tool technology, and in particular to a disposable microcatheter. Background Technology

[0002] Coronary artery interventional surgery, also known as percutaneous coronary intervention, refers to a surgical procedure that uses catheters to open narrowed or blocked coronary arteries, thereby relieving stenosis and improving myocardial blood supply. It involves inserting a sheath into the blood vessel, then injecting contrast agent to visualize the coronary arteries. This visualization allows for the determination of the location and extent of coronary artery lesions, facilitating the diagnosis of coronary heart disease. Microcatheters are a crucial surgical tool in coronary artery interventional surgery.

[0003] Microcatheters are used to assist guidewires in reaching complex or bifurcated lesions, providing channels and guidance for subsequent instrument intervention. However, in existing technologies, the required length of microcatheters varies depending on the patient's body size and the location of the lesion. Longer microcatheters increase the difficulty of the procedure, and there is a lack of surgical microcatheters that can flexibly adapt to patients. Therefore, we propose a disposable microcatheter to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a disposable microcatheter.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A disposable microcatheter includes a protective tube, a tube seat detachably connected to the protective tube, and a catheter structure provided at the end of the protective tube away from the tube seat, wherein the tube seat is fixedly connected by a connecting component;

[0007] The connecting assembly includes a sliding sleeve rotatably connected to the protective tube. A lever is rotatably connected to the sliding sleeve via a spring shaft. The lever passes through the sliding sleeve, and a cutting blade is fixedly connected to one end of the lever. An internal thread is provided inside the protective tube, and a slitting frame is connected to the protective tube via the internal thread. An inner support tube is fixedly connected to the slitting frame, and multiple slitting blades are fixedly connected to the side wall of the inner support tube.

[0008] Preferably, the catheter structure includes an outer tube, an inner tube is disposed inside the outer tube, and a double-lumen tube is also disposed inside the outer tube, and the double-lumen tube is connected to the inner tube. A side opening is disposed on the outer tube near the double-lumen tube, and a guide head is disposed on the end of the outer tube away from the tube seat.

[0009] Preferably, the tube seat includes a main body, one end of which is provided with a connecting sleeve, the connecting sleeve having an external thread matching the internal thread, and the end of the connecting sleeve away from the main body having a tapered head, and the inner wall of the protective tube near the tapered head having a tapered groove.

[0010] Preferably, a reinforcing wire is provided between the outer tube and the inner tube, and a scale mark is provided on the outer tube.

[0011] Preferably, a handle is fixedly connected to the end of the slitting frame away from the inner support tube, and a reinforcing sleeve is provided on the inner support tube.

[0012] Preferably, the end of the outer tube away from the protective tube is coated with a hydrophilic coating.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model, by setting a connecting component, first screws the cutting frame into the protective tube before placing the tube seat on the protective tube, and then inserts the catheter structure into the protective tube. The cutting blade is used to cut the catheter structure until the remaining length of the catheter structure meets the surgical requirements. Then, the user rotates the lever to make the cutting blade cut the catheter structure and abut against the inner support tube. Then, the user continues to rotate the lever to drive the sliding sleeve to remove the excess catheter structure. Finally, the cutting frame and the cut catheter structure are taken out, and the tube seat is installed on the protective tube.

[0015] This invention, by setting a connecting sleeve in conjunction with a conical head, can clamp the catheter structure with the conical groove when the tube seat is fixed on the protective tube, thereby fixing the catheter and the protective tube and ensuring that any defects in the cut surface of the catheter structure will not affect subsequent surgical procedures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a disposable microcatheter proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of a slitting frame structure for a disposable microcatheter proposed in this utility model;

[0018] Figure 3 This is a cross-sectional view of a disposable microcatheter proposed in this utility model;

[0019] Figure 4 for Figure 2 Enlarged structural diagram at point A;

[0020] Figure 5 for Figure 3 Enlarged structural diagram at point B;

[0021] Figure 6This is a schematic diagram of the sliding sleeve structure of a disposable microcatheter proposed in this utility model.

[0022] In the diagram: 1. Protective tube; 2. Tube seat; 21. Main body; 22. Connecting sleeve; 23. Conical head; 24. Conical groove; 3. Sliding sleeve; 4. Lever; 5. Cutting knife; 6. Slitting frame; 7. Inner support tube; 8. Slitting knife; 9. Outer tube; 10. Inner tube; 11. Double-lumen tube; 12. Side opening; 13. Guide head; 14. Scale marking; 15. Handle. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Reference Figure 1-6 A disposable microcatheter includes a protective tube 1, a tube seat 2 detachably connected to the protective tube 1, and a catheter structure provided at the end of the protective tube 1 away from the tube seat 2, wherein the tube seat 2 is fixedly connected by a connecting component;

[0025] The connecting assembly includes a sliding sleeve 3 rotatably connected to the protective tube 1. A lever 4 is rotatably connected to the sliding sleeve 3 via a spring shaft. The lever 4 passes through the sliding sleeve 3, and a cutting blade 5 is fixedly connected to one end of the lever 4. An internal thread is provided inside the protective tube 1, and a slitting frame 6 is connected to the protective tube 1 via the internal thread. An inner support tube 7 is fixedly connected to the slitting frame 6, and multiple slitting blades 8 are fixedly connected to the side wall of the inner support tube 7.

[0026] In this design, all items except the cutting frame 6 are disposable. The cutting frame 6 is used to adjust the length of the catheter structure before the operation. This disposable microcatheter is a rapid-exchange dual-lumen microcatheter, which is packaged after being sterilized with ethylene oxide and is for single use only.

[0027] When using the device, the user first removes the disposable microcatheter from its packaging under aseptic conditions, removing protective materials such as the coil. Based on the preoperative examination of the patient, the total length of the required catheter structure is determined. Then, the cutting frame is screwed into the sheath 1 (at this point, the catheter structure, sheath 1, and tube seat 2 are separate and not assembled). The catheter structure is then inserted into the sheath 1 near the sliding sleeve 3. After the catheter structure is fitted onto the inner support tube 7, it continues to move towards the sheath 1, being cut into strips by multiple cutting blades 8. These strips pass through the gaps in the cutting frame 6. When the remaining length of the catheter structure meets the surgical requirements, the user rotates the lever 4, causing the cutting blade 5 to cut the catheter structure and abut against the inner support tube 7. The user then continues to rotate the lever 4, causing the sliding sleeve 3 to rotate, driving the cutting blade to perform a circumferential cut on the multiple catheter structures (e.g., ...). Figure 6As shown, the direction of the lever 4 is counterclockwise. Finally, the appropriate length of the catheter structure is retained. Then, the user unscrews the cutting frame 6 and removes the discarded part of the catheter structure. Then, the tube seat 2 is pressed on the protective tube 1 and the catheter structure is fixed to the protective tube 1. The surgical operation can then be performed.

[0028] Furthermore, the catheter structure includes an outer tube 9, an inner tube 10 is disposed inside the outer tube 9, a double-lumen tube 11 is also disposed inside the outer tube 9, and the double-lumen tube 11 is connected to the inner tube 10. A side opening 12 is disposed on the outer tube 9 near the double-lumen tube 11, and a guide head 13 is disposed on the end of the outer tube 9 away from the tube seat 2.

[0029] In this design, the catheter structure and function are the same as those of the existing rapid exchange type dual-lumen microcatheter, so they will not be described in detail here. It should be noted that this solution only cuts the part of the catheter structure near the sheath 1, and the inner tube 10 and the outer tube 9 are cut off together, while the part including the dual-lumen tube 11, the side port 12 and the guide head 13 will not be damaged.

[0030] Furthermore, the tube seat 2 includes a main body 21, one end of which is provided with a connecting sleeve 22. The connecting sleeve 22 is provided with an external thread that matches the internal thread, and the end of the connecting sleeve 22 away from the main body 21 is provided with a tapered head 23. The inner wall of the protective tube 1 near the tapered head 23 is provided with a tapered groove 24.

[0031] In this design, the tube seat 2 is screwed into the protective tube 1 after the cutting frame 6 is unscrewed. During the screwing process, the conical head 23 is inserted into the conduit structure to ensure the passage of the conduit. After the conical head 23 is screwed into the conical groove 24, the outer wall of the conical head 23 and the inner wall of the conical groove 24 are used to clamp the conduit structure, thereby fixing the conduit structure, the protective tube 1 and the tube seat 2.

[0032] Furthermore, a reinforcing wire is provided between the outer tube 9 and the inner tube 10, and a scale mark 14 is provided on the outer tube 9;

[0033] The reinforcing wire is designed to improve the physical strength of the catheter structure, while the scale markings 14 are designed to allow users to control the length of the retained catheter structure. Since this type of microcatheter is a disposable item, the cutting blade 5 uses a metal blade with high hardness without considering toughness, which can cut the reinforcing wire. At the same time, the reinforcing wire will not interfere with the cutting blade 8's cutting of the catheter structure.

[0034] Furthermore, a handle 15 is fixedly connected to the end of the slitting frame 6 away from the inner support tube 7, and a reinforcing sleeve is provided on the inner support tube 7;

[0035] The handle 15 allows users to easily screw the slitting frame 6 in or out manually without the aid of tools, while the reinforcing sleeve increases the strength of the inner support tube 7 and prevents it from being cut by the cutting blade 5 and becoming unusable.

[0036] Furthermore, the end of the outer tube 9 furthest from the protective tube 1 is coated with a hydrophilic coating;

[0037] The hydrophilic coating can improve the permeability of the outer tube 9 when inserted into the patient's blood vessels and reduce the patient's physical discomfort.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A disposable microcatheter, comprising a sheath (1), characterized in that, The protective tube (1) is detachably connected to a tube seat (2), and a conduit structure is provided at one end of the protective tube (1) away from the tube seat (2). The tube seat (2) is fixedly connected by a connecting component. The connecting assembly includes a sliding sleeve (3) rotatably connected to the protective tube (1). A lever (4) is rotatably connected to the sliding sleeve (3) via a spring shaft. The lever (4) passes through the sliding sleeve (3), and a cutting blade (5) is fixedly connected to one end of the lever (4). An internal thread is provided inside the protective tube (1), and a slitting frame (6) is connected to the protective tube (1) via the internal thread. An inner support tube (7) is fixedly connected to the slitting frame (6), and multiple slitting blades (8) are fixedly connected to the side wall of the inner support tube (7).

2. The disposable microcatheter according to claim 1, characterized in that, The catheter structure includes an outer tube (9), an inner tube (10) is provided inside the outer tube (9), a double-lumen tube (11) is also provided inside the outer tube (9), and the double-lumen tube (11) is connected to the inner tube (10). A side opening (12) is provided on the outer tube (9) near the double-lumen tube (11), and a guide head (13) is provided on the end of the outer tube (9) away from the tube seat (2).

3. A disposable microcatheter according to claim 1, characterized in that, The tube seat (2) includes a main body (21), one end of which is provided with a connecting sleeve (22). The connecting sleeve (22) is provided with an external thread that matches the internal thread, and the end of the connecting sleeve (22) away from the main body (21) is provided with a tapered head (23). The inner wall of the protective tube (1) near the tapered head (23) is provided with a tapered groove (24).

4. A disposable microcatheter according to claim 2, characterized in that, A reinforcing wire is provided between the outer tube (9) and the inner tube (10), and a scale mark (14) is provided on the outer tube (9).

5. A disposable microcatheter according to claim 1, characterized in that, The cutting frame (6) is fixedly connected to a handle (15) at the end away from the inner support tube (7), and a reinforcing sleeve is provided on the inner support tube (7).

6. A disposable microcatheter according to claim 2, characterized in that, The outer tube (9) is coated with a hydrophilic coating at the end away from the protective tube (1).

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