Balloon-free catheter

Abstract

The utility model discloses a balloon-free catheter which comprises an outer-layer tube, an inner-layer tube, a telescopic tube and an excretion opening connector, the outer-layer tube is sleeved on the outer side of the inner-layer tube in a clearance mode, and the near end of the outer-layer tube is fixedly connected with the near end of the inner-layer tube. The near end of the telescopic tube is fixedly connected with the far end of the outer-layer tube, the far end of the telescopic tube is fixedly connected with the far end of the inner-layer tube, the excretion opening connector is fixedly connected with the far end of the telescopic tube and is communicated with the inner-layer tube, and the near end of the outer-layer tube is provided with a limiting section which can protrude outwards when being extruded in the radial direction. The device has the advantages of being simple in structure, easy and convenient to operate and good in using effect.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a balloon-free urinary catheter. Background Art

[0002] Foley catheters are commonly used to drain and direct urine from a patient's urinary system. Traditionally, foley catheters are typically secured with a balloon. However, balloon fixation carries risks such as balloon rupture, excessive outer diameter at the balloon joint, inflation before the catheter is fully inserted, and over-inflation causing mucosal or tissue irritation. Furthermore, balloon manufacturing is complex and involves numerous steps. Clinically, balloon catheterization procedures are also relatively cumbersome, requiring extensive experience to determine proper insertion. This poses the risk of error for inexperienced medical personnel.

[0003] To address the above-mentioned problems, a Chinese utility model patent with publication number CN204428599U discloses a balloon-free indwelling urinary catheter. This balloon-free indwelling urinary catheter is provided with a controllable expansion and contraction balloon segment at the patient end of the catheter. The expansion and contraction of the balloon segment is not controlled by gas or liquid, but by a controller at the interface end of the catheter's excretion cavity. This can meet the indwelling catheterization function in clinical use and completely avoid the defects of existing products such as balloon rupture, balloon inflation cavity blockage, balloon and inflation path leakage, and the inability to fully recover from balloon deformation after indwelling. However, the above-mentioned balloon-free indwelling urinary catheter expands or contracts by winding a titanium-nickel alloy wire around the shaft through a knob with a shaft, or by pulling the balloon segment to expand or contract by controlling the meshing position of the micro gear and the rack segment through the knob. The structure is complex, and the shaft is placed horizontally in the drainage cavity joint, which hinders or even blocks the flow of urine. In addition, one end of the shaft passes through the drainage cavity joint and is connected to the knob. Urine may leak to the outside through the gap formed at the position where the shaft passes through the drainage cavity joint, causing pollution to the environment.

[0004] How to solve the above problems has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] The purpose of the utility model is to provide a non-ballooned urinary catheter with simple structure, easy operation and good use effect.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a non-ballooned urinary catheter, comprising an outer tube, an inner tube, a telescopic tube, and an excretion port joint, wherein the outer tube is sleeved on the outside of the inner tube and the proximal end of the outer tube is fixedly connected to the proximal end of the inner tube, the proximal end of the telescopic tube is fixedly connected to the distal end of the outer tube and the distal end of the telescopic tube is fixedly connected to the distal end of the inner tube, the excretion port joint is fixedly connected to the distal end of the telescopic tube and the excretion port joint is communicated with the inner tube, and the proximal end of the outer tube is provided with a limiting section that can bulge outward when subjected to radial compression.

[0008] Furthermore, the limiting section includes a tube body, which is gap-mounted on the outside of the proximal end of the inner tube and is provided with a plurality of cuts extending along its length direction. Each of the cuts is arranged around the side wall of the tube body and each cut passes through the side wall of the outer tube.

[0009] Furthermore, at least two drainage holes are provided on the side wall of the inner tube, and the inner tube is connected with the outer tube through the drainage holes.

[0010] Furthermore, the proximal end of the outer tube is provided with a closed end, one end of the closed end is a rounded head-shaped structure and the other end of the closed end is fixedly connected to the proximal ends of the outer tube and the inner tube.

[0011] Furthermore, the telescopic tube is a bellows.

[0012] Furthermore, the length of the outer tube is shorter than that of the inner tube.

[0013] Due to the adoption of the above structure, the utility model has the following beneficial effects:

[0014] The utility model is provided with an outer tube, an inner tube, a telescopic tube, and an excretion port connector. After the proximal end of the outer tube is placed in a predetermined position within the urinary system, the excretion port connector is pulled back, and the telescopic tube is stretched. This, while keeping the outer tube fixed, can drive the inner tube to move backward, causing the limiting section to be radially squeezed and bulge outward, thereby achieving the effect of fixing the position of the urinary catheter. Therefore, the utility model has a simple structure and is easy to operate. After successful indwelling, urine can be discharged from the body through the inner tube and the excretion port connector in sequence. The urine flows smoothly, effectively avoiding blockage and leakage during the catheterization process, and has a good use effect.

[0015] The present invention will become more clear through the following description in conjunction with the accompanying drawings, which are used to explain embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model when the telescopic tube is in a stretched state;

[0018] Figure 2 This is a half-section view of the telescopic tube of the present invention when it is in a compressed state;

[0019] Figure 3 It is the AA cross-sectional view of the present utility model;

[0020] Figure 4 It is a partial enlarged view of part B of the utility model;

[0021] Figure 5 It is a partial enlarged view of part C of the present utility model;

[0022] Figure 6 This is a schematic structural diagram of the outer tube of the present invention;

[0023] Figure 7 This is a schematic structural diagram of the inner tube of the present invention;

[0024] Figure 8 This is a schematic structural diagram of the proximal end of the outer tube when the limiting section of the present invention protrudes outward;

[0025] Figure 9 This is a right side view of the utility model when the limiting section is protruding outward. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Please refer to Figures 1 to 9The utility model provides a non-balloon urinary catheter, comprising an outer tube 1, an inner tube 2, a telescopic tube 3, and an excretion port joint 4, wherein the outer tube 1 is sleeved on the outside of the inner tube 2 and the proximal end of the outer tube 1 is fixedly connected to the proximal end of the inner tube 2, the proximal end of the telescopic tube 3 is fixedly connected to the distal end of the outer tube 1, and the distal end of the telescopic tube 3 is fixedly connected to the distal end of the inner tube 2, the excretion port joint 4 is fixedly connected to the distal end of the telescopic tube 3, and the excretion port joint 4 is communicated with the inner tube 2, and the proximal end of the outer tube 1 is provided with a limiting section 101 that can bulge outward when subjected to radial compression. During use, after the excretion port connector 4 is connected to the external collection device and the proximal end of the urinary catheter is placed at a predetermined position in the urinary system, the excretion port connector 4 is pulled back, and the excretion port connector 4 drives the inner tube 2 to move backward as a whole through the distal end of the telescopic tube 3, thereby applying a pulling force to the distal end of the outer tube 1. Due to the stretching of the telescopic tube 3 and the outer wall of the outer tube 1 fitting against the urethra, the relative position of the outer tube 1 in the urethra remains unchanged before the length of the telescopic tube 3 is stretched to the maximum, thereby causing the limiting section 101 to be subjected to a radial squeezing force and bulge outward, which can fix the position of the urinary catheter, and urine can be discharged from the body through the inner tube 2 and the excretion port connector 4 in turn.

[0028] In the present utility model, the limiting section 101 includes a tube body 1011, which is gap-mounted on the outside of the proximal end of the inner tube 2 and is provided with a plurality of cuts 1012 extending along its length direction. Each of the cuts 1012 is arranged around the side wall of the tube body 1011 and each cut 1012 passes through the side wall of the outer tube 1, thereby cutting the tube body 1011 into a plurality of strip petal structures with arc-shaped cross-sections. The tube body 1011 is made of elastic plastic material, such as elastic polyurethane, silicone rubber, natural latex, etc., and the outer tube 1 is made of the same or different material as the tube body 1011 to form an integrally molded structure; before use, the telescopic tube 3 is in a compressed state, the outer diameter of the limiting section 101 is equal to the outer diameter of the tube body 1011, and the catheter can smoothly enter and exit the urinary system; when in use, the inner tube 2 is pulled to slide backward, and the pulling force acts on the outer tube 1 to form a tendency to drive the outer tube 1 to move backward, but due to the friction between the narrow urethra and the outer tube 1, the friction force is greater than the sum of the friction between the outer tube 1 and the inner tube and the pulling force of the inner tube on the proximal end of the outer tube 1, so that the two ends of the tube body 1011 are subjected to forces in opposite directions, and the tube body 1011 is radially squeezed and bulges outward to form a petal-shaped ball cage structure with an outer diameter greater than the diameter of the outer tube 1, thereby fixing the position of the catheter.

[0029] In the present invention, at least two drainage holes 201 are formed on the side wall of the inner tube 2, and the inner tube 2 communicates with the outer tube 1 through the drainage holes 201. One of the drainage holes 201 is located inside the limiting section 101, allowing urine to quickly flow into the inner tube 2 through the cutouts 1012 and the drainage hole 201; another drainage hole 201 is located at one end of the inner tube 2 near the drainage port connector 4. The remaining drainage holes 201 can be arranged along the length of the inner tube 2, allowing urine located between the inner tube 2 and the outer tube 1 to enter the inner side of the inner tube 2, effectively preventing urine from remaining in the gap between the inner tube 2 and the outer tube 1.

[0030] In the present invention, a closed end 5 is provided at the proximal end of the outer tube 1, one end of the closed end 5 is a rounded head-shaped structure and the other end of the closed end 5 is fixedly connected to the proximal ends of the outer tube 1 and the inner tube 2, which can effectively improve the comfort of tube placement, and when the inner tube 2 moves backward, it can provide a force for squeezing the limiting section 101 through the closed end 5.

[0031] In the present invention, the telescopic tube 3 is a corrugated tube. When the discharge port connector 4 is pulled back, the telescopic tube 3 is stretched, which can prevent the outer tube 1 from synchronously moving backward under the action of the pulling force, and by changing the stretched length of the telescopic tube 3, the convexity of the limiting section 101 can be adjusted.

[0032] In the present invention, the length of the outer tube 1 is smaller than the length of the inner tube 2 .

[0033] When using the present invention, the telescopic tube 3 is first compressed to make the outer diameter of the limiting section 101 equal to the outer diameter of the tube body 1011. The proximal end of the urinary catheter is then inserted into the predetermined position within the urinary system. The drainage port connector 4 is then pulled back. The drainage port connector 4 drives the inner tube 2 as a whole backward via the distal end of the telescopic tube 3. As the telescopic tube 3 is stretched, the limiting section 101 is radially squeezed and bulges outward, forming a petal-shaped cage structure with an outer diameter greater than that of the outer tube 1. This secures the position of the urinary catheter, allowing urine to flow sequentially through the incisions 1012, the drainage holes 201, the inner tube 2, and the drainage port connector 4 into an external collection device. Therefore, the present invention has a simple structure, is easy to operate, and provides smooth urinary catheterization. It can effectively prevent urine contamination of the external environment and has excellent performance.

[0034] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A balloonless urinary catheter, Features: The invention comprises an outer tube (1), an inner tube (2), a telescopic tube (3), and a discharge port joint (4), wherein the outer tube (1) is sleeved on the outer side of the inner tube (2) and the proximal end of the outer tube (1) is fixedly connected to the proximal end of the inner tube (2), the proximal end of the telescopic tube (3) is fixedly connected to the distal end of the outer tube (1) and the distal end of the telescopic tube (3) is fixedly connected to the distal end of the inner tube (2), the discharge port joint (4) is fixedly connected to the distal end of the telescopic tube (3) and the discharge port joint (4) is communicated with the inner tube (2), and the proximal end of the outer tube (1) is provided with a limiting section (101) which can protrude outward when subjected to radial compression.

2. A balloonless urinary catheter according to claim 1, Features: The limiting section (101) comprises a tube body (1011), the tube body (1011) being sleeved on the outside of the proximal end of the inner tube (2) and having a plurality of cutouts (1012) extending along its length direction, each of the cutouts (1012) being arranged around the side wall of the tube body (1011) and each of the cutouts (1012) passing through the side wall of the outer tube (1).

3. A balloonless urinary catheter according to claim 2, Features: At least two drainage holes (201) are provided on the side wall of the inner tube (2), and the inner tube (2) is connected to the outer tube (1) via the drainage holes (201).

4. A balloonless urinary catheter according to any one of claims 1 to 3, Features: The proximal end of the outer tube (1) is provided with a closed end (5), one end of the closed end (5) is a rounded head-shaped structure and the other end of the closed end (5) is fixedly connected to the proximal ends of the outer tube (1) and the inner tube (2).

5. A balloonless urinary catheter according to any one of claims 1 to 3, Features: The telescopic tube (3) is a corrugated tube.

6. A balloonless urinary catheter according to any one of claims 1 to 3, Features: The length of the outer layer tube (1) is shorter than the length of the inner layer tube (2).

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