Self-voiding metal urinary catheter

Abstract

The utility model relates to a kind of self-urination metal catheter, it includes the catheter body woven by metal wire, the distal end of catheter body is provided with bending anti-off structure to prevent the distal end of catheter body from being outwardly off from bladder in indwelling state, the proximal end of catheter body is close to external sphincter after passing through prostate area, the proximal end of catheter body is connected with fixed anchor placed in urethra by connecting line, fixed anchor is located at the outside of external sphincter and cannot slide to prostate area inwardly by the block of external sphincter, one end of fixed anchor is connected with traction rope, the other end of traction rope is stretched to patient's outside through urethra.The advantages are that new structure and material are used, infection risk can be effectively reduced, catheter indwelling time is prolonged, and stimulation to urethra or other urinary tissues is reduced;Catheter indwelling period does not need to use urine bag, and patient can self-control urination, improve life quality;Catheter body woven by metal wire is moderately soft and hard, and has good self-adaptability.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, specifically relating to a metal catheter that allows for autonomous urination. Background Technology

[0002] Traditional urinary catheters are mostly made of natural latex, silicone rubber, or polyvinyl chloride (PVC), and mainly consist of a tube body, a bulb at the tip, and an injection valve. The bulb at the tip is placed in the bladder, and after being inflated by the injection valve, it is used to secure the catheter and prevent it from dislodging from the body. Traditional urinary catheters utilize the pressure of the bladder to force urine through the catheter into a urine bag outside the body.

[0003] The problems and disadvantages of traditional urinary catheters are as follows: They are invasive instruments that disrupt the natural barrier of the urethra. With the two ends of the catheter placed inside and outside the body respectively, bacteria can easily enter the bladder and kidneys through the catheter, causing symptoms such as urinary frequency, urgency, and dysuria, with an infection rate exceeding 98%. Long-term use of traditional catheters easily leads to bacterial colonization. If not regularly replaced or flushed, crystal stones may form, further increasing the risk of infection (latex catheters are generally used for no more than 7 days, and silicone catheters for no more than 30 days). Traditional catheters have virtually no radial self-adjustment capability; if the size is incorrect, it can cause urethral mucosal damage, bleeding, and even require surgical repair. Long-term indwelling of traditional catheters keeps the bladder in a state of prolonged emptiness, leading to bladder atrophy, reduced capacity, and affecting the recovery of spontaneous urination function. During patient self-inflicted or accidental removal of the catheter, the bladder and urethra are easily damaged. Utility Model Content

[0004] This invention provides a metal catheter capable of autonomous urination, aiming to overcome, to some extent, the aforementioned shortcomings of traditional catheters.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A metal catheter capable of autonomous urination includes a catheter body made of braided metal wire. The distal end of the catheter body, placed in the patient's bladder, is provided with a bending anti-dislodgement structure to prevent the distal end of the catheter body from dislodging out of the bladder when indwelling. The proximal end of the catheter body passes through the prostate region and approaches the external sphincter. The proximal end of the catheter body is connected to a fixed anchor placed in the urethra via a connecting line. The fixed anchor is located outside the external sphincter and is blocked by the external sphincter from sliding inward to the prostate region. The fixed anchor is connected to one end of a traction rope, and the other end of the traction rope extends out of the patient's body through the urethra.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the bending anti-dislodgement structure includes an unclosed annular anti-dislodgement body formed by bending and spiraling the distal segment of the catheter body.

[0008] Furthermore, the connecting wire is a metal wire or a plastic rope.

[0009] Furthermore, the fixed anchor is an unclosed ring formed by bending and coiling metal wire.

[0010] Furthermore, one end of the metal wire that is bent and coiled into the fixed anchor is fixedly connected to the connecting line, and the other end is fixedly connected to the traction rope.

[0011] Furthermore, the traction rope is made of PTFE, ePTFE, or nylon.

[0012] Furthermore, both the bending anti-detachment structure and the fixing anchor are made of nickel-titanium metal wire with shape memory properties through a secondary heat treatment process.

[0013] Furthermore, the diameter of the metal wire used to braid the catheter body is 0.02-0.2 mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The urinary catheter provided by this utility model adopts a novel structure and materials, which can effectively reduce the risk of bacterial infection in patients, prolong the indwelling time of the urinary catheter in the body, and reduce irritation to the urethra or other urinary tissues. During the indwelling period of the urinary catheter, there is no need to use a urine bag, and patients can control urination independently, improving their quality of life. The catheter body is formed by braiding metal wire, which is moderately soft and hard, solving the shortcomings of traditional urinary catheters that are too hard, have a strong foreign body sensation, and have fixed radial dimensions. The catheter body of this utility model is formed by braiding metal wire, which has sufficient radial support and can adapt to compression deformation caused by different external forces. It can self-contract radially and has good size adaptability. When subjected to violent pulling, the catheter body can autonomously contract and deform, which can solve the problem of bladder and urethral damage caused by patients' self-forced removal or accidental removal of the catheter. Attached Figure Description

[0016] Figure 1 A schematic diagram of a self-draining metal catheter provided by this utility model;

[0017] Figure 2 for Figure 1 The diagram shows a metal catheter for autonomous urination placed inside the human body.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 1. Catheter body; 2. Bending anti-dislodgement structure; 3. Connecting line; 4. Fixing anchor; 5. Traction rope; 10. Bladder; 20. Prostate; 30. External sphincter; 40. Urethral. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] In the description of this utility model, if terms such as "upper", "lower", "left", "right", "top", "bottom", "inner", and "outer" are used to indicate the orientation or positional relationship, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] like Figure 1 and Figure 2 As shown, this utility model provides a self-draining metal catheter, which includes a catheter body 1 made of braided metal wire. The distal end of the catheter body 1, placed in the patient's bladder 10, is provided with a bending anti-dislodgement structure 2 to prevent the distal end of the catheter body 1 from dislodging out of the bladder 10 when indwelling. The proximal end of the catheter body 1 passes through the prostate 20 region and approaches the external sphincter 30. The proximal end of the catheter body 1 is connected to a fixing anchor 4 placed in the urethra 40 via a connecting line 3. The fixing anchor 4 is located outside the external sphincter 30 and is blocked by the external sphincter 30 from sliding inward to the prostate 20 region. The fixing anchor 4 is connected to one end of a traction rope 5, and the other end of the traction rope 5 extends out of the patient's body through the urethra 40.

[0023] It should be noted that the distal portion of the catheter body placed in the bladder has a spiral ring structure (a curved anti-dislodgement structure, such as...). Figure 1 and 2As shown), when the proximal end of the catheter body is subjected to significant external force (accidental pulling or when the catheter body needs to be removed), the bending anti-dislodgement structure can automatically transform into a straightening structure to facilitate dislodgement from the bladder, preventing damage to the bladder from excessive external force on the distal end of the catheter body; during normal indwelling use, the bending anti-dislodgement structure is used to prevent the distal end of the catheter from dislodging from the bladder; the fixing anchor is placed below the external urethral sphincter (bulbar urethra) to fix the catheter inward and prevent the catheter body from sliding too deeply towards the bladder; the fixing anchor and the catheter body are connected by a nickel-titanium wire, which is thin and can be well wrapped by the external sphincter when it contracts, preventing urine leakage; the traction rope facilitates the removal of the catheter body from the body after treatment; the catheter body's mesh structure is made of nickel-titanium metal braid, and the spiral ring structure and fixing anchor are made of nickel-titanium metal braid. It is shaped using a secondary heat treatment process; the braided structure has a certain radial support force, which can adapt to compression deformation caused by different external forces, but will not be completely crushed, thus possessing a certain degree of self-adaptability. The metal braided catheter body can be made of one or two metal wires, specifically referring to the wire braided tubes used for cardiac stents or vascular stents; urine is drained through the channel constructed by the catheter to the area above the external sphincter, allowing the patient to control the external sphincter to achieve urination without the need for an external urine bag; this catheter is particularly suitable for cases requiring long-term indwelling catheterization and where the prostate region severely compresses the posterior urethra, causing difficulty in urination. The catheter body can moderately open the posterior urethra to ensure smooth urination for the patient; the catheter body is a braided tube with multiple perforations, making it easy for urine in the bladder to be drained outwards.

[0024] In one embodiment of the present invention, the bending anti-dislodgement structure 2 includes an unclosed annular anti-dislodgement body formed by bending and spiraling the distal segment of the catheter body 1.

[0025] It is understandable that, such as Figure 1 As shown, the so-called unclosed annular anti-dislodgement structure refers to the spiral annular structure formed by bending the distal end of the catheter body. The distal end is a free end, and it is not fixed after bending and spiraling, thus not forming a closed annular structure. The advantage of this design is that when the proximal end of the catheter body is subjected to a large outward pulling force, the bending anti-dislodgement structure can gradually and automatically straighten, so that the distal end can pass through the bladder, prostate region, external sphincter and urethra, etc., making it easy to remove the catheter body and avoiding damage to the bladder and related tissues at the distal end.

[0026] In one embodiment of this utility model, the connecting wire 3 is a metal wire or a plastic rope.

[0027] In one embodiment of this utility model, the fixing anchor 4 is an unclosed ring formed by bending and coiling metal wire.

[0028] It should be noted that, as Figure 1As shown, the unclosed ring structure referred to here is a metal wire bent into loops of different sizes, with both ends of the wire being free ends, through which a traction rope and a connecting line are connected respectively. When the anchor is subjected to violent pulling, it will gradually straighten, just like the bending anti-dislodgement structure described above, thus facilitating its passage through the urethra and outwards.

[0029] In one embodiment of this utility model, one end of the metal wire that is bent and coiled into the fixed anchor 4 is fixedly connected to the connecting line 3, and the other end is fixedly connected to the traction rope 5.

[0030] In one embodiment of this utility model, the traction rope 5 is made of PTFE, ePTFE or nylon.

[0031] It should be noted that the surface of the traction rope made of the above-mentioned material is relatively smooth, not easy to get dirty, and it is durable and can be disinfected.

[0032] In one embodiment of this utility model, both the bending anti-detachment structure 2 and the fixing anchor 4 are formed by a nickel-titanium metal wire with shape memory properties through a second heat treatment.

[0033] It should be noted that nickel-titanium wire not only has good biocompatibility, but also shape memory properties. It can be straightened and placed in the sheath. After being placed in place in the body, it will automatically return to a specific shape for positioning after being removed, making it easy to operate.

[0034] In one embodiment of this utility model, the diameter of the metal wire used to braid the catheter body 1 is 0.02-0.2 mm.

[0035] Understandably, in practice, the diameter of the metal wire is selected based on the number of perforations when it is woven into a tube and the magnitude of the radial support force of the tube body resulting from different processes, in order to match the pressure exerted on it by the prostate region.

[0036] This new type of urinary catheter has its main body completely placed inside the body, solving the problem of traditional catheters that directly connect the inside and outside of the body through the lumen, making it easy for external bacteria to invade. The exposed part of the traction rope can be disinfected with alcohol or iodine after each bowel movement. It is made of biocompatible nickel-titanium material, which prolongs the indwelling time in the body and reduces the pain of frequent catheter changes for patients. It adopts a more adaptable braided structure, solving the problems of the rigidity of traditional catheters and strong foreign body sensation. The tube body is located above the sphincter, draining urine from the bladder into the urethra above the sphincter, allowing the patient to urinate spontaneously without the need for a urine collection bag, improving the patient's quality of life, and long-term placement will not affect the patient's spontaneous urination function. Under external force and pulling, the new urinary catheter can automatically contract and deform without putting too much pressure on the bladder wall, solving the problem of bladder damage caused by accidental pulling of traditional catheters. The new urinary catheter is easy to remove; the traction rope is inserted into the sheath, and pulling the traction rope can pull the catheter back into the sheath, thus removing it from the body.

[0037] The specific method for placing the metal urinary catheter provided by this utility model into the human body is briefly described as follows: First, the urinary catheter is pre-compressed in a sheath; the sheath can be inserted into the bladder through the lumen of a cystoscope without a guidewire; after the front part of the sheath is inserted into the bladder, the urinary catheter is pushed out of the sheath until the spiral ring structure is completely released from the sheath (observed under the visualization of a cystoscope); the sheath is withdrawn outward to begin releasing the lower part of the urinary catheter body and the fixing anchor; continue to withdraw to release the traction rope, completing the insertion.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-draining metal urinary catheter, characterized in that, The catheter body (1) is made of braided metal wire. The distal end of the catheter body (1) is placed in the patient's bladder (10) and is provided with a bending anti-dislodgement structure (2) to prevent the distal end of the catheter body (1) from dislodging out of the bladder (10) when in place. The proximal end of the catheter body (1) passes through the prostate (20) region and approaches the external sphincter (30). The proximal end of the catheter body (1) is connected to a fixing anchor (4) placed in the urethra (40) via a connecting line (3). The fixing anchor (4) is located outside the external sphincter (30) and is blocked by the external sphincter (30) from sliding inward to the prostate (20) region. The fixing anchor (4) is connected to one end of a traction rope (5), and the other end of the traction rope (5) extends out of the patient's body through the urethra (40).

2. The self-draining metal catheter according to claim 1, characterized in that, The bending anti-dislodgement structure (2) includes an unclosed annular anti-dislodgement body formed by bending and spiraling the distal segment of the catheter body (1).

3. The self-draining metal catheter according to claim 1, characterized in that, The connecting line (3) is a metal wire or a plastic rope.

4. The self-draining metal catheter according to claim 1, characterized in that, The fixed anchor (4) is an unclosed ring formed by bending and coiling metal wire.

5. A self-draining metal urinary catheter according to claim 4, characterized in that, One end of the metal wire that is bent and coiled into the fixed anchor (4) is fixedly connected to the connecting line (3), and the other end is fixedly connected to the traction rope (5).

6. The self-draining metal catheter according to claim 1, characterized in that, The traction rope (5) is made of PTFE, ePTFE or nylon.

7. A self-draining metal catheter according to any one of claims 1 to 6, characterized in that, The bending anti-detachment structure (2) and the fixed anchor (4) are both made of nickel-titanium metal wire with shape memory properties through secondary heat treatment.

8. A self-draining metal catheter according to claim 7, characterized in that, The diameter of the metal wire used to braid the catheter body (1) is 0.02-0.2 mm.

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