CN118267542A - Urinary catheterization system and urinary catheterization method - Google Patents

Abstract

The invention relates to a urinary catheterization system, which comprises a urinary catheter with two channels, wherein the urinary catheter comprises an outer pipe body and an inner pipe body, the first end of the inner pipe body is provided with a high-elasticity balloon, and a plurality of drainage holes are formed in the balloon; the first end of the outer tube body is provided with a bud ball which can be opened and closed, the bud ball is formed by tightly closing at least 2 petal-shaped guide vanes, and the guide vanes are provided with drain holes. The invention also relates to a catheterization method using the catheterization system, which can smoothly discharge urinary mucosa secretion and residual urine and greatly reduce the risks of diseases such as urinary tract infection, non-infectious inflammation, urinary tract tuberculosis, urinary calculi and the like; and solves the problem that the catheter cannot smoothly pass through the urethral catheterization narrow section due to insufficient hardness.

Description

Urinary catheterization system and urinary catheterization method

Technical Field

The invention relates to the technical field of medical appliances, in particular to a catheterization system and a catheterization method.

Background

A urinary catheter is a conduit that is inserted into the bladder from the urethra in order to drain urine. Is a pipeline made of natural rubber, silicon rubber or polyvinyl chloride (PVC), can be inserted into the bladder through the urethra so as to drain urine, and after the catheter is inserted into the bladder, an air bag is arranged near the head end of the catheter to fix the catheter and is left in the bladder, so that the catheter is not easy to fall out, and the drainage tube is connected with a urine bag to collect urine. Patients with urinary retention or bladder outlet obstruction, urinary incontinence, accurate monitoring of urine volume, patients unable or unwilling to collect urine, patients who need to lie in bed or be forced in position for a long period of time, and perioperative use during surgery, etc. The indwelling catheterization is a bladder emptying mode which cannot be replaced clinically at present, and discomfort symptoms such as urinary tract infection, non-infectious inflammation, urinary tract tuberculosis, urinary calculi and the like are easily generated in urination, and are caused by irritation of bladder neck and bladder triangle.

If the urinary mucosa secretion cannot be discharged and a biological film is formed around the urinary catheter after long-term accumulation, as the biological film is microcolonies formed by aggregation and propagation of microorganisms, organic matters and inorganic matters, the liquid discharge port of the traditional urinary catheter is positioned at the tip of the urinary catheter, namely, when a patient stands upright or lies flat, the liquid discharge port is higher than the urinary bladder urethra opening, namely, a certain amount of urine cannot flow out of the urinary catheter, which is clinically commonly called residual urine, which easily causes the formation of stones around the urinary catheter and can cause the increase of urinary tract infection risk. In addition, the urinary catheter is difficult to be placed in a patient with urethral stricture, and the urinary catheter cannot smoothly pass through the urethral stricture due to insufficient hardness.

Disclosure of Invention

Aiming at the problems of biomembrane accumulation, residual urine, easy blockage of a drainage hole, insufficient hardness of a catheter and the like in the prior art, the invention provides a catheterization system and a catheterization method.

In one aspect, the invention provides a urinary catheterization system, which comprises a urinary catheter with two channels, wherein the urinary catheter comprises an outer pipe body and an inner pipe body, the inner cavity of the inner pipe body is a first urine flowing channel, and the cavity formed by the outer wall of the inner pipe body and the inner wall of the outer pipe body is a second urine flowing channel; in the cross section of the catheter body of the catheter, the outer wall of the inner tube body is tangent to the inner wall of the outer tube body, and the inner tube body can axially slide in the cavity of the outer tube body;

The first end of the inner pipe body is provided with a high-elasticity balloon, and a plurality of drain holes are formed in the balloon; the first end of the outer tube body is provided with a bud ball which can be opened and closed, the bud ball is formed by tightly closing at least 2 petal-shaped guide vanes, and the guide vanes are provided with drain holes; the root part of at least one guide vane connected with the second urine channel is provided with a miniature liquid level sensing chip, and the miniature liquid level sensing chip is electrically connected with a control unit of the urine guiding system;

The opening and closing of the guide vane of the bud ball are controlled by a flexible traction wire on the balloon and a rigid traction wire on the inner wall of the outer tube body;

When the catheter enters the bladder, the guide leaves of the bud ball are opened, and the balloon ball is positioned in the middle of the bud ball; when the first end of the outer tube exits the bladder, the balloon is wrapped within the bud or the balloon is positioned within the second urine flow channel proximate the first end of the outer tube.

The first urine flowing channel and the second urine flowing channel are two mutually independent urine guiding channels, so that the problem that urine cannot be discharged due to channel blockage can be solved. Meanwhile, one end of the catheter entering the bladder is creatively designed through the bud ball and the balloon, the guide vane can be better attached to the bladder wall, and residual urine at the urinary meatus of the bladder can be better discharged.

In the urethral catheterization system, the lower end of the rigid traction wire is fixedly arranged on the inner wall of the outer tube body and is far away from the inner tube body; the top end of the rigid traction wire is a bullet-shaped solid block, and the bottom of the bullet-shaped solid block is provided with a ring; the first end of the flexible traction wire is fixedly connected with the balloon, and the second end of the flexible traction wire penetrates through the ring to be fixedly connected with the tail end of each guide vane.

The rigid traction wire enhances the strength of the catheter in the insertion process, and the flexible traction wire is matched with the balloon to realize the opening and closing of the flow guide blade of the bud ball.

Further, in the urethral catheterization system of the invention, the outer surface of the balloon is uniformly provided with small villi.

In the urethral catheterization system, the outer tube body comprises an insertion part, a holding part and an exposed part, and wavy bulges are arranged on the outer walls of the insertion part and the holding part.

Further, in the urethral catheterization system of the invention, after the front area of the exposed part penetrates through the wall of the outer tube body and extends out of a certain distance, the inner tube body is connected to the inner cavity of the outer tube body from the wall of the outer tube body, and finally is communicated to the urine bag.

In the urethral catheterization system, small villi are uniformly arranged on the inner surface of the guide vane, and the length of the small villi is 0.5-2.5 mm and the diameter of the small villi is 0.05-0.15 mm.

The small villus can prevent the excretory opening of the saccule and the guide vane from being blocked by the solid phase substances of the biomembrane class in urine, can adhere the solid phase substances of the biomembrane class, is wrapped in the bud ball to be discharged out of the body together with the taking out of the catheter, and reduces the risks of urinary calculus, bacterial infection and the like.

The wavy bulge design can increase the hardness of the urinary catheter during insertion, and well solves the problem of difficult insertion of the urinary catheter for patients with urethral stricture.

Further, in the urethral catheterization system of the invention, the outer pipe body and the inner pipe body axially slide through the buckling connection.

In the urethral catheterization system, the second end of the catheter is communicated with the urine bag, the front end of the urine bag is provided with the miniature medical negative pressure pump, and the miniature medical negative pressure pump is electrically connected with the control unit.

The miniature medical negative pressure pump is controlled by the control unit, and when the miniature liquid level sensing chip senses residual urine, the control unit starts the miniature medical negative pressure pump to generate tiny suction force on the residual urine, so that the residual urine is discharged.

In the urethral catheterization system, a flow monitor, a pressure sensor and a temperature sensor are arranged in front of the miniature medical negative pressure pump, and the flow monitor, the pressure sensor and the temperature sensor are electrically connected with the control unit.

The control unit controls the flow monitor, the pressure sensor and the temperature sensor to work, the memory of the control unit can record and store the urine volume and the urine temperature of the patient each time, and the pressure sensor needs to ensure the normal pressure of the urinary catheter in the urination process and the like.

In another aspect, the present invention provides a urinary catheterization method using a urinary catheterization system as defined in any of the above, in particular comprising the steps of:

step 1) adjusting the body position of a patient, sterilizing the catheter, aligning the head of the catheter with the urethral orifice, slowly inserting the catheter into the bladder, pushing the inner tube body to open the bud ball, and enabling the balloon ball to enter the bladder; the catheter is ensured to be fixed after being stabilized, and urine flows out;

step 2) monitoring whether urine remains or not through a miniature liquid level sensing chip;

Step 3) if urine stops flowing out but the urine has residues, opening a miniature medical negative pressure pump, and applying negative pressure to the inlet of the catheter to enable the residual urine to flow out;

and 4) pulling down the inner tube body to close the bud ball, and slowly pulling out the catheter.

Compared with the prior art, the invention has the following beneficial technical effects:

The urethral catheterization system and the urethral catheterization method can smoothly discharge urinary mucosa secretion and residual urine, and greatly reduce the risks of diseases such as urinary tract infection, non-infectious inflammation, urinary tuberculosis, urinary calculi and the like; and solves the problem that the catheter cannot smoothly pass through the urethral catheterization narrow section due to insufficient hardness.

The first urine flowing channel and the second urine flowing channel are two mutually independent urine guiding channels, so that the problem that urine cannot be discharged due to channel blockage can be solved. Meanwhile, one end of the catheter entering the bladder is creatively designed through the bud ball and the balloon, the guide vane can be better attached to the bladder wall, and residual urine at the urinary meatus of the bladder can be better discharged.

The rigid traction wire enhances the strength of the catheter in the insertion process, and the flexible traction wire is matched with the balloon to realize the opening and closing of the flow guide blade of the bud ball.

The small villus can prevent the excretory opening of the saccule and the guide vane from being blocked by the solid phase substances of the biomembrane class in urine, can adhere the solid phase substances of the biomembrane class, is wrapped in the bud ball to be discharged out of the body together with the taking out of the catheter, and reduces the risks of urinary calculus, bacterial infection and the like.

The wavy bulge design can increase the hardness of the urinary catheter during insertion, and well solves the problem of difficult insertion of the urinary catheter for patients with urethral stricture.

The miniature medical negative pressure pump is controlled by the control unit, and when the miniature liquid level sensing chip senses residual urine, the control unit starts the miniature medical negative pressure pump to generate tiny suction force on the residual urine, so that the residual urine is discharged.

The control unit controls the flow monitor, the pressure sensor and the temperature sensor to work, and the memory of the control unit can record and store the urine volume and the urine temperature of the patient each time, so that the workload of doctors and nurses is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of a urinary catheterization system of the present invention;

FIG. 2 is a schematic diagram showing the open bud of the first end of the outer tube and the first end of the inner tube;

FIG. 3 is a schematic view showing the structure of the first end of the outer tube and the first end of the inner tube in the bud-ball state;

FIG. 4 is a schematic view of the distribution structure of the guide leaves of the bud ball according to the present invention;

FIG. 5 is a schematic view of the structure of each guide vane of the bud ball according to the present invention;

FIG. 6 is a schematic view of a wavy bulge structure of the present invention;

FIG. 7 is a schematic view of a snap connection between an outer tube and an inner tube according to the present invention;

wherein: 1. the device comprises a bud ball, 2, an insertion part, 3, a hand-held part, 4, an exposed part, 5, a distance, 6, a miniature medical negative pressure pump, 7, a flow monitor, 8, a pressure sensor, 9, a temperature sensor, 10, a urine bag, 11 and a bladder;

101. The device comprises an outer tube body, 102, an inner tube body, 103, a balloon, 104, a bullet-shaped solid block, 105, a guide vane, 106, a balloon drain hole, 107, a guide vane drain hole, 108, a rigid traction wire, 109, a flexible traction wire, 110, a miniature liquid level sensing chip, 1011, wavy bulges and 1012.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. The described embodiments are intended to be only a few, but not all, of the many other embodiments of the present invention that will be within the scope of the present invention as those of ordinary skill in the art will achieve, based on the embodiments of the present invention, without any inventive effort. The specific conditions are not specified in the specific embodiments and are carried out according to conventional conditions or conditions suggested by the manufacturer.

When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments exemplarily described below do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims. The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

The first embodiment is as follows:

As shown in fig. 1 to 7, the catheterization system of the present invention includes a catheter having two channels, the catheter includes an outer tube body 101 and an inner tube body 102, an inner cavity of the inner tube body 102 is a first urine flowing channel, and a cavity formed by an outer wall of the inner tube body 102 and an inner wall of the outer tube body 101 is a second urine flowing channel; in the cross section of the catheter body, the outer wall of the inner tube body 102 is tangent to the inner wall of the outer tube body 101, and the inner tube body 102 can axially slide in the cavity of the outer tube body 101;

A first end of the inner tube 102 is provided with a high-elasticity balloon 103, and a plurality of drain holes 106 are formed in the balloon 103; the first end of the outer tube 101 is provided with a bud ball 1 which can be opened and closed, the bud ball 1 is formed by tightly closing at least 2 petal-shaped guide leaves 105, and the guide leaves 105 are provided with drain holes 107; a miniature liquid level sensing chip 110 is arranged at the root part of at least one guide vane 105 connected with the second urine flowing channel, and the miniature liquid level sensing chip 110 is electrically connected with a control unit of the urine guiding system;

The opening and closing of the guide vane 105 of the bud ball 1 is controlled by the flexible traction wire 109 on the balloon 103 and the rigid traction wire 108 on the inner wall of the outer tube 101;

When the catheter enters the bladder 11, the guide vane 105 of the bud ball 1 is opened, and the balloon 103 is positioned in the middle of the bud ball 1; when the first end of the outer tube 101 leaves the bladder 11, the balloon 103 is wrapped in the bud 1, or the balloon 103 is positioned in the second urine flow path near the first end of the outer tube 101.

In some embodiments, the lower end of the rigid traction wire 108 is fixedly disposed on the inner wall of the outer tube 101 and is far away from the inner tube 102; the top end of the rigid traction wire 108 is a bullet-shaped solid block, and the bottom of the bullet-shaped solid block is provided with a ring; the first end of the flexible traction wire 109 is fixedly connected to the balloon 103, and the second end of the flexible traction wire 109 is fixedly connected to the end of each of the guide vanes 105 through the ring.

In some embodiments, the outer surface of the balloon 103 is uniformly provided with small naps.

In some embodiments, the outer tube 101 and the inner tube 102 are axially slidably coupled by a snap 1012.

In some embodiments, small naps are uniformly provided on the inner surface of the guide vane 105, and the length of the small naps is 0.5-2.5 mm, and the diameter of the small naps is 0.05-0.15 mm.

In some embodiments, the outer tube 101 includes an insertion portion 2, a holding portion 3, and an exposed portion 4, and the outer walls of the insertion portion 2 and the holding portion 3 are provided with wavy protrusions 1011.

In some embodiments, the inner tube 102 penetrates the wall of the outer tube 101 at the front region of the exposed portion 4 and then extends a distance, and then is connected to the inner cavity of the outer tube 101 from the wall of the outer tube 101, and finally is connected to the urine bag 10.

In some embodiments, the second end of the catheter is in communication with the urine bag 10, the front end of the urine bag 10 is provided with a micro medical negative pressure pump 6, and the micro medical negative pressure pump 6 is electrically connected with the control unit.

In some embodiments, the micro medical negative pressure pump 6 is provided with a flow monitor 7, a pressure sensor 8 and a temperature sensor 9 before, and the flow monitor 7, the pressure sensor 8 and the temperature sensor 9 are electrically connected with the control unit.

The second embodiment is as follows:

the invention relates to a catheterization method, which uses a catheterization system in the first specific embodiment, and specifically comprises the following steps:

Step 1) adjusting the body position of a patient, sterilizing the catheter, aligning the head of the catheter with the urethral orifice, slowly inserting the catheter into the bladder 11, pushing the inner tube 102 to open the bud ball 1, and allowing the balloon ball 103 to enter the bladder 11; the catheter is ensured to be fixed after being stabilized, and urine flows out;

step 2), monitoring whether urine remains or not through the micro liquid level sensing chip 110;

Step 3) if urine stops flowing out but the urine has residues, opening a miniature medical negative pressure pump 6, and applying negative pressure to the inlet of the catheter to enable the residual urine to flow out;

Step 4) pulling down the inner tube 102 to close the bud ball 1, and then slowly pulling out the catheter.

The present invention will be described in further detail with reference to specific examples.

Example 1

The invention relates to a urethral catheterization system, which comprises a urethral catheter with two channels, wherein the urethral catheter comprises an outer pipe body 101 and an inner pipe body 102, the inner cavity of the inner pipe body 102 is a first urination channel, and the cavity formed by the outer wall of the inner pipe body 102 and the inner wall of the outer pipe body 101 is a second urination channel; in the section of the catheter body, the outer wall of the inner tube body 102 is tangent to the inner wall of the outer tube body 101, and the inner tube body 102 can axially slide in the cavity of the outer tube body 101;

The first end of the inner tube body 102 is provided with a high-elasticity balloon 103, and a plurality of drain holes 106 are formed in the balloon 103; the first end of the outer tube body 101 is provided with a bud ball 1 which can be opened and closed, the bud ball 1 is formed by tightly closing at least 2 petal-shaped guide vanes 105, and the guide vanes 105 are provided with drain holes 107; the root part of at least one guide vane 105 connected with the second urine flowing channel is provided with a miniature liquid level sensing chip 110, and the miniature liquid level sensing chip 110 is electrically connected with a control unit of the urine guiding system;

The opening and closing of the guide vane 105 of the bud ball 1 are controlled by a flexible traction wire 109 on the balloon ball 103 and a rigid traction wire 108 on the inner wall of the outer tube body 101;

When the catheter enters the bladder 11, the guide leaves 105 of the bud ball 1 are opened, and the balloon 103 is positioned in the middle of the bud ball 1; when the first end of the outer tube 101 leaves the bladder 11, the balloon 103 is wrapped within the bud ball 1, or the balloon 103 is positioned within a second urine flow path proximate the first end of the outer tube 101.

The lower end of the rigid traction wire 108 is fixedly arranged on the inner wall of the outer tube body 101 and is far away from the inner tube body 102; the top end of the rigid traction wire 108 is a bullet-shaped solid block 104, and the bottom of the bullet-shaped solid block 104 is provided with a ring; the first end of the flexible traction wire 109 is fixedly connected with the balloon 103, and the second end of the flexible traction wire 109 passes through the ring and is fixedly connected with the tail end of each guide vane 105.

The outer surface of the balloon 103 is uniformly provided with small villi.

The outer tube 101 and the inner tube 102 are connected by a buckle 1012 to axially slide.

The inner surface of the guide vane 105 is uniformly provided with small fluff, the length of the small fluff is 0.5-2.5 mm, and the diameter of the small fluff is 0.05-0.15 mm.

The outer tube 101 includes an insertion portion 2, a holding portion 3, and an exposed portion 4, and the outer walls of the insertion portion 2 and the holding portion 3 are provided with wavy protrusions 1011.

After penetrating the wall of the outer tube body 101 in the front region of the exposed portion 4 and extending a certain distance, the inner tube body 102 is connected to the inner cavity of the outer tube body 101 from the wall of the outer tube body 101, and finally is connected to the urine bag 10.

The second end of the catheter is communicated with a urine bag 10, the front end of the urine bag 10 is provided with a miniature medical negative pressure pump 6, and the miniature medical negative pressure pump 6 is electrically connected with the control unit.

The miniature medical negative pressure pump 6 is provided with a flow monitor 7, a pressure sensor 8 and a temperature sensor 9 before, and the flow monitor 7, the pressure sensor 8 and the temperature sensor 9 are electrically connected with a control unit.

Example 2

The invention relates to a catheterization method, which uses the catheterization system in the specific embodiment, and specifically comprises the following steps:

Step 1) adjusting the body position of a patient, sterilizing the catheter, aligning the head of the catheter with the urethral orifice, slowly inserting the catheter into the bladder 11, pushing the inner tube 102 to open the bud ball 1, and allowing the balloon ball 103 to enter the bladder 11; the catheter is ensured to be fixed after being stabilized, and urine flows out;

step 2), monitoring whether urine remains or not through the micro liquid level sensing chip 110;

Step 3) if urine stops flowing out but the urine has residues, opening a miniature medical negative pressure pump 6, and applying negative pressure to the inlet of the catheter to enable the residual urine to flow out;

Step 4) pulling down the inner tube 102 to close the bud ball 1, and then slowly pulling out the catheter.

While the invention has been described with reference to the specific embodiments and examples, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. The parts of the present invention not described in detail in the specification are known to those skilled in the art. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. The urethral catheterization system is characterized by comprising a catheter with two channels, wherein the catheter comprises an outer tube body and an inner tube body, the inner cavity of the inner tube body is a first urine flowing channel, and the cavity formed by the outer wall of the inner tube body and the inner wall of the outer tube body is a second urine flowing channel; in the cross section of the catheter body of the catheter, the outer wall of the inner tube body is tangent to the inner wall of the outer tube body, and the inner tube body can axially slide in the cavity of the outer tube body;

The first end of the inner pipe body is provided with a high-elasticity balloon, and a plurality of drain holes are formed in the balloon; the first end of the outer tube body is provided with a bud ball which can be opened and closed, the bud ball is formed by tightly closing at least 2 petal-shaped guide vanes, and the guide vanes are provided with drain holes; the root part of at least one guide vane connected with the second urine channel is provided with a miniature liquid level sensing chip, and the miniature liquid level sensing chip is electrically connected with a control unit of the urine guiding system;

The opening and closing of the guide vane of the bud ball are controlled by a flexible traction wire on the balloon and a rigid traction wire on the inner wall of the outer tube body;

When the catheter enters the bladder, the guide leaves of the bud ball are opened, and the balloon ball is positioned in the middle of the bud ball; when the first end of the outer tube exits the bladder, the balloon is wrapped within the bud or the balloon is positioned within the second urine flow channel proximate the first end of the outer tube.

2. The urinary catheterization system according to claim 1, characterized in that the lower end of the rigid pull wire is fixedly arranged on the inner wall of the outer tube body and is remote from the inner tube body; the top end of the rigid traction wire is a bullet-shaped solid block, and the bottom of the bullet-shaped solid block is provided with a ring; the first end of the flexible traction wire is fixedly connected with the balloon, and the second end of the flexible traction wire penetrates through the ring to be fixedly connected with the tail end of each guide vane.

3. The urinary catheterization system according to claim 2, wherein the balloon is evenly provided with small villi on its outer surface.

4. A urinary catheterization system according to claim 3, characterized in that the outer tubular body comprises an insertion portion, a holding portion and an exposed portion, the outer walls of both the insertion portion and the holding portion being provided with wavy protrusions.

5. The urinary catheterization system of claim 4, wherein the inner tube body extends a distance through the wall of the outer tube body at a front region of the exposed portion, and then is connected to the inner cavity of the outer tube body from the wall of the outer tube body for final communication to the urine bag.

6. The urinary catheterization system according to claim 5, wherein small villi are uniformly arranged on the inner surface of the guide vane, and the length of the small villi is 0.5-2.5 mm and the diameter of the small villi is 0.05-0.15 mm.

7. The urinary catheterization system of claim 6, wherein the outer tube and the inner tube are connected by a snap fit and are axially slidable.

8. The urinary catheterization system according to any one of claims 1-7, wherein the second end of the urinary catheter is communicated with the urine bag, a miniature medical negative pressure pump is installed at the front end of the urine bag, and the miniature medical negative pressure pump is electrically connected with the control unit.

9. The urinary catheterization system according to any one of claims 1-7, wherein a flow monitor, a pressure sensor and a temperature sensor are arranged before the miniature medical negative pressure pump, and the flow monitor, the pressure sensor and the temperature sensor are electrically connected with the control unit.

10. A catheterization method, characterized in that the catheterization method uses the catheterization system according to any one of claims 1-9, in particular comprising the following steps:

step 1) adjusting the body position of a patient, sterilizing the catheter, aligning the head of the catheter with the urethral orifice, slowly inserting the catheter into the bladder, pushing the inner tube body to open the bud ball, and enabling the balloon ball to enter the bladder; the catheter is ensured to be fixed after being stabilized, and urine flows out;

step 2) monitoring whether urine remains or not through a miniature liquid level sensing chip;

Step 3) if urine stops flowing out but the urine has residues, opening a miniature medical negative pressure pump, and applying negative pressure to the inlet of the catheter to enable the residual urine to flow out;

and 4) pulling down the inner tube body to close the bud ball, and slowly pulling out the catheter.