CN210698464U - catheter with sheath - Google Patents

Abstract

The utility model provides a catheter with a sheath, which relates to the technical field of medical instruments, and comprises a catheter body and an outer sheath for supporting urethra; the sheath is a hollow tubular structure and can be inserted into the urethral orifice, the side wall of the front section of the catheter body is provided with a liquid inlet, and the front section of the catheter body can be inserted into the sheath and enter the bladder. The technical problems that the urethral catheter in the prior art is not easy to be inserted into a narrow urethra and the urethral catheter is easy to be blocked to influence the urethral catheter are solved.

Description

catheter with sheath

technical field

The utility model relates to the technical field of medical devices, in particular to a urinary catheter with a sheath.

Background technique

A catheter is a tube that is inserted through the urethra into the bladder to drain urine. It is a tube made of natural rubber, silicone rubber or polyvinyl chloride (PVC), which can be inserted into the bladder through the urethra to drain urine. The tube remains in the bladder and is not easy to come out, and the drainage tube is connected to the urine bag to collect urine.

Lesions or damages to the kidneys, ureters, bladder, prostate and posterior urethra caused by various reasons, as well as after resection of the prostate, will cause continuous bleeding into the bladder, and in severe cases, blood clots will form in the bladder. Failure to discharge in time can easily cause blood clots to accumulate, block the urethra, cause urinary retention, and make patients difficult to urinate and unbearable lower abdominal pain. The urination opening of the indwelling ordinary balloon catheter should be smaller than the volume of the blood clot, and the blood clot is not easy to be excreted through the catheter, which will cause blockage, and it is difficult to maintain smooth drainage. In patients with benign prostatic hyperplasia and urethral stricture, the common urinary catheter is relatively soft and difficult to insert into the urethra, so it is difficult to indwell it successfully.

Utility model content

The purpose of the utility model is to provide a catheter with a sheath, so as to alleviate the technical problems that the catheter in the prior art is not easy to be inserted into the narrow urethra and the catheter is easily blocked and affects the catheterization.

The utility model provides a catheter with a sheath, which comprises a catheter body and an outer sheath for supporting the urethra;

The outer sheath is a hollow tubular structure and can be inserted into the urethral orifice, the side wall of the front section of the catheter body is provided with a liquid inlet, and the front section of the catheter body can be inserted into the outer sheath and enter the bladder.

As a further technical solution, the front section of the catheter body is surrounded with a balloon, the rear section of the catheter body is split with a liquid outlet and an inflation port, and the liquid outlet is connected to the liquid inlet. The airbag communicates with the inflation port.

As a further technical solution, the catheter body is a hollow tubular structure, and the communication channel between the inflation port and the air bag and the communication channel between the liquid inlet and the liquid outlet are mutually Parallel arrangement and integral molding arrangement.

As a further technical solution, the outer side wall of the outer sheath is provided with a hydrophilic coating.

As a further technical solution, the inner side wall of the outer sheath or the outer side wall of the catheter body is provided with a hydrophilic coating.

As a further technical solution, the outer sheath is provided with a first scale line along its length direction.

As a further technical solution, the urinary catheter body is provided with a second scale line along its length direction.

As a further technical solution, a suction ball is also included, and the suction ball can be butt-fitted with the rear end of the outer sheath.

As a further technical solution, both the outer sheath and the catheter body are made of transparent materials.

As a further technical solution, there are a plurality of the liquid inlets, and the plurality of the liquid inlets are evenly arranged along the circumferential direction of the side wall of the urinary catheter body.

Compared with the prior art, the beneficial effects of the sheathed urinary catheter provided by the present invention are as follows:

The sheathed catheter provided by the utility model includes a catheter body and an outer sheath for supporting the urethra, wherein the outer sheath is a hollow tubular structure, the outer sheath can be inserted into the urethra, and its length can ensure that the front end can be inserted into the bladder The inner and outer sheaths can be bent and deformed in the length direction, but the radial direction will not change greatly after being inserted into the urethra, that is, the shape of the inner cavity can be maintained to complete the support for the narrow urethra. The anterior segment of the urinary catheter body can be passed through the outer sheath into the bladder.

During the specific operation, the outer sheath is inserted into the urethra, and then the front section of the catheter body enters the bladder through the outer sheath and is fixed. At this time, the urine in the bladder can enter the catheter body through the liquid inlet and flow out of the body. When a blood clot in the bladder blocks the fluid inlet, the catheter body can be pulled out, and the blood clot can flow out of the body from the outer sheath with a larger diameter. The outer sheath is filled with water to disperse the clot, and the dissipated clot is then aspirated out of the body.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the following descriptions The accompanying drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the axial side structural representation of the catheter with sheath provided by the embodiment of the present utility model;

Fig. 2 is the front view structure schematic diagram of the sheathed urinary catheter provided by the embodiment of the present utility model;

3 is a schematic front view of the structure of the catheter body in the catheter with a sheath provided by an embodiment of the present invention.

Icons: 100 - catheter body; 101 - airbag; 102 - liquid inlet; 103 - liquid outlet; 104 - inflation port; 105 - first scale line;

200 - outer sheath; 201 - second tick mark.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a 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 those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "left", "right", "vertical", "horizontal", "inner", "outer", etc. Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot It is understood as a limitation of the present invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIGS. 1-3 , an embodiment of the present invention provides a catheter with a sheath, including a catheter body 100 and an outer sheath 200 for supporting the urethra; the outer sheath 200 is a hollow tubular structure and can be inserted In the urethra, the front section of the catheter body 100 is provided with a liquid inlet 102, and the front section of the catheter body 100 can be inserted into the outer sheath 200 and enter the bladder.

The sheathed catheter provided by the embodiment of the present invention includes a catheter body 100 and an outer sheath 200 for supporting the urethra, wherein the outer sheath 200 is a hollow tubular structure, and the outer sheath 200 can be inserted into the urethra, and its length is It can ensure that the front end can be inserted into the bladder, the outer sheath 200 can be bent and deformed in the longitudinal direction, but the radial direction will not change greatly after being inserted into the urethra, that is, the shape of the internal cavity can be maintained, so as to complete the support for the narrow urethra, At this time, the front section of the relatively flexible catheter body 100 can pass through the outer sheath 200 and enter the bladder.

During the specific operation, the outer sheath 200 is inserted into the urethra, and then the front section of the catheter body 100 enters the bladder through the outer sheath 200 and is fixed. At this time, the urine in the bladder can enter the catheter body 100 through the liquid inlet 102 and out of the body. When blood clots in the bladder block the liquid inlet 102, the catheter body 100 can be pulled out, and the blood clots can flow out of the body from the outer sheath 200 with a larger diameter. The mouth or syringe fills the outer sheath 200 with water to disperse the blood clot, which is then aspirated out of the body.

It is worth noting that when the outer sheath 200 is inserted into the urethra, after the catheter body 100 is inserted into the outer sheath 200 and positioned in the bladder, the front end of the outer sheath 200 is not located in the bladder. Preferably, the front end of the outer sheath 200 is just located at the bladder neck. (ie the junction of the bladder and urethra).

In addition, in this embodiment, the catheter body 100 is also a cylindrical structure, and its diameter can be equal to or slightly smaller than the inner diameter of the outer sheath 200. The catheter body 100 can be easily inserted into the outer sheath 200 and can also ensure urinary catheterization. The tightness between the tube body 100 and the outer sheath 200 ensures that urine will not leak from the gap between the catheter body 100 and the outer sheath 200 .

Finally, the outer sheath 200 in this embodiment is also made of a material that is environmentally friendly and harmless to the human body, which is slightly harder than the catheter body 100 and can be bent and deformed. The catheter body 100 is still made of natural rubber, silicone rubber or It is made of polyvinyl chloride (PVC), and its size and shape can also be the same as the size and shape of the existing urinary catheter.

Specifically, in this embodiment, the specific structure of the sheathed urinary catheter is also introduced in detail below.

First of all, in this embodiment, the front section of the catheter body 100 is surrounded with a balloon 101, and the rear section of the catheter body 100 is provided with a liquid outlet 103 and an inflation port 104, and the liquid outlet 103 is communicated with the liquid inlet 102. The airbag 101 communicates with the inflation port 104 .

Specifically, the liquid inlet 102 is disposed near the front end of the catheter body 100 , and the balloon 101 is located at the front end of the catheter body 100 but slightly away from the front end of the catheter body 100 . In the catheter body 100 in the initial state, the balloon 101 is not inflated, and it is attached to the outer wall of the catheter body 100, so that the appearance of the front section of the catheter body 100 is similar to the shape of a cylinder, and the front section of the catheter body 100 can be through the outer sheath 200.

When the air bag 101 on the front section of the catheter body 100 passes through the outer sheath 200 and enters the bladder, the air bag 101 can be inflated through the inflation port 104. The radial length of the air bag 101 after inflation is greater than the outer diameter of the outer sheath 200. It is also larger than the diameter of the urethra. At this time, the catheter body 100 is pulled outward, and the air bag 101 first abuts against the front section of the outer sheath 200 and drives the outer sheath 200 to move outward together until the air bag 101 moves to the bladder neck. The catheter body 100 cannot continue to move outward, and the fixation of the catheter body 100 and the outer sheath 200 in the human body is completed. At this time, the balloon 101 closes the gap between the catheter body 100 and the outer sheath 200, and also closes the gap between the catheter body 100 and the outer sheath 200. The gap between the urethra and the outer sheath 200 is closed to ensure that the urine can only be discharged from the body through the urethral tube body.

It should be noted that, in this embodiment, the airbag 101 can also be filled and expanded by water injection.

In this embodiment, the catheter body 100 is a hollow tubular structure, and the communication channel between the inflation port 104 and the air bag 101 and the communication channel between the liquid inlet 102 and the liquid outlet 103 are parallel to each other and integrally formed.

Specifically, in this embodiment, the communication channel between the inflation port 104 and the airbag 101 is smaller than the communication channel between the liquid inlet 102 and the liquid outlet 103 , and the cross-sections of the two channels are both circular, wherein the liquid inlet 102 The communication channel with the liquid outlet 103 is the main channel, the axis of which coincides with the central axis of the catheter body 100, at this time, it can be considered that the thickness of the annular side wall of the catheter body 100 is the same, and the inflation port 104 and the airbag 101 The diameter of the communication channel between them is smaller than the thickness of the side wall and is arranged at a certain position of the side wall.

In this embodiment, the outer side wall of the outer sheath 200 is provided with a hydrophilic coating.

Hydrophilic coatings are water-friendly, which chemically means that the coating participates in dynamic hydrogen bonding processes with water in the device environment. In most cases, the hydrophilic coating is also ionic and usually has a negative charge, which will facilitate interaction with aqueous solutions. From a physical point of view, the chemical interaction between the coating and water creates a gel material that exhibits an extremely low coefficient of friction. Collectively, these chemical and physical properties describe a material that is wettable, lubricating, and suitable for specific biological interactions, and is currently mainly used in medical device interventional products.

Lubricity is a surface property, that is, the magnitude of the coefficient of friction on the surface of the beam. Since the lubricating surface reduces the intervention force and makes it easier for the outer sheath 200 to enter the urethra, for patients with benign prostatic hyperplasia and urethral stricture, when the outer sheath 200 is inserted into the urethra, the pressure between the outer sheath 200 and the urethra is greater, and By reducing the coefficient of friction between the outer sheath 200 and the urethra, the friction force between the two is reduced, the outer sheath 200 is easier to insert into the urethra, and the outer sheath 200 is prevented from contusion of the urethra, thereby reducing the pain of the patient.

Preferably, in this embodiment, a hydrophilic coating is also provided on the inner side wall of the outer sheath 200 or the outer side wall of the catheter body 100 .

Specifically, in this embodiment, a hydrophilic coating is preferably provided on the inner side wall of the outer sheath 200. Before the catheter body 100 is inserted into the outer sheath 200, the inner sheath 200 or the outer surface of the catheter body 100 can be lubricated first, and then inserted into the outer sheath 200. The outer sheath 200 reduces the difficulty of inserting the catheter body 100 into the outer sheath 200 .

Alternatively, in this embodiment, a hydrophilic coating may also be provided on the outer side wall of the catheter body 100 , or both the inner side wall of the outer sheath 200 and the outer side wall of the catheter body 100 may be provided with a hydrophilic coating.

It is worth noting that due to the flexibility and deformability of the catheter body 100, in this embodiment, the diameter of the front section of the catheter body 100 and the inner diameter of the outer sheath 200 are preferably set to be the same. There is basically no gap between the tube body 100 and the outer sheath 200 , which further ensures the sealing between the two, and ensures that urine can only be discharged through the catheter body 100 .

As a further improvement of this embodiment, the outer sheath 200 is provided with a first scale line 105 along its length direction.

Specifically, it is easy to know that the total length of the outer sheath 200 should be greater than the length of the longest urethra of the human body, so as to be able to adapt to all people. The specified length of the urethra is inserted, and it can be ensured that the outer sheath 200 has been inserted into the bladder under this length, and no further insertion is required.

Further, in this embodiment, the catheter body 100 is further provided with a second scale line 201 along its length direction.

At this time, when the catheter body 100 is inserted into the outer sheath 200, the catheter body 100 can be inserted into the specified length according to the second scale line 201, so as to ensure that the balloon at the front section of the catheter body 100 can be made within this length. 101 just passes through the outer sheath 200 to avoid over-insertion of the catheter body 100.

Further, this embodiment further includes a suction ball, which can be butt-fitted with the rear end of the outer sheath 200 .

Specifically, during the operation of dispersing the blood clots accumulated at the bladder neck, the gas or liquid in the balloon 101 is first discharged to pull the catheter body 100 out of the outer sheath 200 , and then the suction ball absorbs water and is in contact with the outer sheath 200 . The back ends are docked, squeeze the suction ball to squeeze the water into the outer sheath 200, and disperse the blood clots accumulated at the front end of the outer sheath 200, and then the suction ball recovers, and the flushed blood clots are sucked out of the suction ball through the outer sheath 200 to complete the bladder. Clearing of internal blood clots.

Preferably, in this embodiment, the outer sheath 200 and the catheter body 100 are both made of transparent materials.

Specifically, by setting the catheter body 100 to be made of a transparent material, it is convenient to observe the color of the outflowing urine. After there is a sign of blood clot outflow, the catheter body 100 can be removed in time and the blood clot can be discharged through the outer sheath 200. Outside the body, reducing the suffering of the patient.

Finally, in this embodiment, multiple liquid inlets 102 may be provided, and the multiple liquid inlets 102 are evenly arranged along the circumferential direction of the side wall of the catheter body 100 .

After the front section of the catheter body 100 is inserted into the bladder, one side may abut against the side wall of the bladder, thereby blocking the liquid inlet 102. Or multiple fluid inlets 102 are blocked, and there are still other fluid inlets 102 that can communicate with the bladder and the cavity of the catheter body 100 .

Alternatively, in this embodiment, only one liquid inlet 102 may be provided on the side wall of the front section of the urinary catheter body 100 .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention .

Claims (10)

1. a sheathed catheter is characterized in that, comprises catheter body and the outer sheath for supporting urethra; The outer sheath is a hollow tubular structure and can be inserted into the urethral orifice, the side wall of the front section of the catheter body is provided with a liquid inlet, and the front section of the catheter body can be inserted into the outer sheath and enter the bladder. 2. The sheathed catheter according to claim 1, wherein the front section of the catheter body is surrounded with a balloon, and the rear section of the catheter body is split and provided with a liquid outlet and an inflation port , the liquid outlet is communicated with the liquid inlet, and the airbag is communicated with the inflation port. 3 . The sheathed catheter according to claim 2 , wherein the catheter body is a hollow tubular structure, and the communication channel between the inflation port and the air bag is connected to the liquid inlet. 4 . The communication channels with the liquid outlet are arranged parallel to each other and integrally formed. 4 . The sheathed urinary catheter according to claim 1 , wherein the outer side wall of the outer sheath is provided with a hydrophilic coating. 5 . 5 . The sheathed catheter according to claim 4 , wherein the inner side wall of the outer sheath or the outer side wall of the catheter body is provided with a hydrophilic coating. 6 . 6 . The sheathed urinary catheter according to claim 1 , wherein the outer sheath is provided with a first scale line along its length direction. 7 . 7 . The sheathed catheter according to claim 6 , wherein the catheter body is provided with a second scale line along its length direction. 8 . 8 . The sheathed urinary catheter according to claim 1 , further comprising a suction ball capable of butt-fitting with the rear end of the outer sheath. 9 . 9 . The catheter with a sheath according to claim 1 , wherein the outer sheath and the catheter body are both made of transparent materials. 10 . 10 . The sheathed catheter according to claim 1 , wherein there are a plurality of the liquid inlets, and the plurality of the liquid inlets are evenly arranged along the circumferential direction of the side wall of the catheter body. 11 .

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