CN109173018B

CN109173018B - Adapter of catheter

Info

Publication number: CN109173018B
Application number: CN201811093978.1A
Authority: CN
Inventors: 陶崇林
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-09-19
Filing date: 2018-09-19
Publication date: 2024-09-13
Anticipated expiration: 2038-09-19
Also published as: CN109173018A

Abstract

The invention discloses an adapter of a catheter, which comprises an adapter body, wherein a first connector capable of being connected and communicated with the catheter and a second connector capable of being connected and communicated with a urine bag are arranged on the adapter body, the adapter body comprises an observation chamber communicated with the second connector, the observation chamber is limited by a peripheral transparent outer wall, a diversion connector communicated with the observation chamber is arranged on the adapter body and is used for being connected and communicated with a saccule water injection port, and a vent hole communicated with the outside is arranged at the inner wall of the observation chamber. The invention has simple structure, can be convenient for medical staff to judge the drainage condition of the saccule and is convenient for the extraction of the catheter.

Description

Adapter of catheter

Technical Field

The present invention relates to an adapter for a urinary catheter.

Background

The catheter is a pipeline made of natural rubber, silicon rubber or polyvinyl chloride (PVC), and can be inserted into the bladder through the urethra so as to drain urine, thereby preventing the bladder from swelling due to the urine holding of patients. After the catheter is inserted into the bladder, the balloon arranged at one end of the catheter limits the end of the catheter in the bladder, so that the catheter is not easy to deviate from the bladder, and the other end of the catheter is inserted with a urine bag for collecting urine. The other end of the catheter is also provided with a water filling port communicated with the balloon, a sealing structure is arranged at the water filling port, the balloon arranged in the bladder can be inflated after water is filled from the water filling port through the injector, and the sealing structure can prevent water in the balloon from leaking out. After the urethral catheterization is finished, devices such as a syringe are usually needed to be connected with a water injection port of the urethral catheter, so that water in the balloon can be discharged under the action of balloon pressure, and the urethral catheter can be pulled out smoothly.

The invention of China patent CN207462361U discloses an adapter of a catheter, which comprises an adapter body, wherein a diversion connector communicated with a drainage port of the catheter and a liquid outlet communicated with a drainage bag are arranged on the adapter body, and a drainage connector communicated with a water injection port of the catheter is also arranged on the adapter body. The arrangement of the drainage port and the liquid outlet can lead the urine in the catheter into the urine bag. After the urethral catheterization is completed, the water drainage connector on the adapter body is connected with the water injection port of the saccule, water in the saccule can be directly discharged into the urine bag through the liquid outlet, the whole drainage process is simple to operate, other tools are not needed, the urine bag can also collect discharged water, and the urethral catheter is convenient to pull out. However, in actual use, medical staff has a lack of effective observation means when draining water in the balloon, so that it is difficult to judge whether the water in the balloon is drained completely, and when the water in the balloon is not completely drained, the catheter is difficult to pull out from the body, and damage is easily caused to body organs.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the adapter of the catheter, which has a simple structure, can facilitate medical staff to judge the drainage condition of the balloon, and is convenient for the extraction of the catheter.

The invention provides an adapter of a catheter, which comprises an adapter body, wherein a first connector capable of being connected and communicated with the catheter and a second connector capable of being connected and communicated with a urine bag are arranged on the adapter body, the adapter body comprises an observation chamber communicated with the second connector, the observation chamber is limited by a peripheral transparent outer wall, a diversion connector communicated with the observation chamber is arranged on the adapter body and is used for being connected and communicated with a saccule water injection port, and a vent hole communicated with the outside is arranged at the inner wall of the observation chamber.

The beneficial effects of the invention are as follows: the first connector and the second connector arranged on the adapter body can be respectively used for being connected and conducted with the catheter and the urine bag, so that urine in the catheter can flow into the urine bag along the adapter body. In addition, through butt joint of sacculus water filling port and water conservancy diversion joint, make the liquid in the sacculus can spray in the observation room under self pressure effect to can enter into the urine bag along the second joint, therefore the drainage process of sacculus need not use the syringe, and the operation is more convenient, can also collect waste liquid moreover. Because the observation chamber is communicated with the urine bag through the second connector, negative pressure is generated in the observation chamber when liquid in the balloon enters the observation chamber and flows into the urine bag along the second connector, and because the vent hole communicated with the outside is arranged at the inner wall of the observation chamber, the outside air enters the observation chamber from the vent hole under the action of the difference of the air pressure inside and outside the observation chamber, and observable gas is generated in the observation chamber. Because the observation chamber is limited by the transparent outer wall all around, medical staff can observe the gas generation condition in the observation chamber directly perceivedly, and then make things convenient for medical staff to judge whether liquid in the sacculus is exhausted, be convenient for the safe pull out of catheter.

As a further arrangement of the invention, the adapter body is detachably provided with a sealing cap which can cover the diversion joint and the vent hole at the same time.

The technical scheme has the advantages that: since urine may enter the observation chamber from the urine bag, when the adapter of the catheter of the invention is used for catheterization, the sealing cap can prevent urine from flowing out of the diversion joint and the vent hole, so that the use is more sanitary.

As a further arrangement of the present invention, an end of the vent hole facing the observation chamber is provided with a waterproof air intake member capable of letting in air and preventing liquid from overflowing.

The technical scheme has the advantages that: when the invention is used for balloon drainage, the waterproof air inlet component enables external air to enter the observation chamber as usual, and balloon liquid and urine in the observation chamber cannot overflow outwards along the vent hole, so that the use is more sanitary.

As a further arrangement of the invention, the viewing chamber is provided with a marker which moves with the flow of liquid.

The technical scheme has the advantages that: by providing a marker in the observation chamber that can move with the flow of liquid, the observation effect is improved.

As a further arrangement of the invention, the adapter body comprises a first component and a second component, the first connector is arranged on the first component, the second connector, the diversion connector and the observation chamber are all arranged on the second component, the first component comprises a first diversion channel and a first diversion port which are communicated with the urine bag when the adapter body is in butt joint with the second component, the first diversion channel and the first diversion port are communicated through an inner cavity, a sealing element is slidably arranged in the inner cavity, and an elastic element for elastically pressing the sealing element at the first diversion port to seal the first diversion port is arranged in the inner cavity, and the second component comprises a collision part which can push the sealing element to move in the direction opposite to the acting force of the elastic element when the first component and the second component are in butt joint and enable the first diversion port to be opened.

The technical scheme has the advantages that: because the adapter body is including being used for the first subassembly of being connected with the catheter, be used for the second subassembly of being connected with the urine bag, can realize butt joint intercommunication through first subassembly and second subassembly between catheter and the urine bag. Because slide is provided with the sealing member and be provided with the elastic component that compresses tightly the sealing member elasticity in the inner chamber between first water conservancy diversion passageway and the first water conservancy diversion mouth and carry out confined elastic component to it in this water conservancy diversion mouth department, and the second subassembly is including conflict portion, can promote the sealing member towards the opposite direction motion with the elastic component effort through conflict portion on the second subassembly when first subassembly and the second subassembly butt joint to can make first water conservancy diversion mouth open. When first subassembly and second subassembly phase separation, the sealing member in the inner chamber loses the effort of the conflict portion of first subassembly and compresses tightly again in first water conservancy diversion mouth department and seals first water conservancy diversion mouth under the drive of elastic component after, and the closing action is rapid, direct for urine in the catheter can't follow first water conservancy diversion mouth department and flow, and outside air also can't enter into in the inner chamber from first water conservancy diversion mouth department, therefore need not to disinfect when changing the drainage bag, makes the change of drainage bag become more convenient, and it is also more sanitary to use.

As a further arrangement of the invention, the sealing member comprises a sliding part capable of sliding along the first diversion opening, the sliding part can slide towards the inner cavity direction under the pushing of the abutting part, the sliding part is of a tubular structure with an inner hole, the rear end of the sliding part is a closed end, the front end of the sliding part, which faces the abutting part, is an open end communicated with the inner hole of the sliding part, a plurality of communication openings are circumferentially distributed on the peripheral wall of the sliding part, which is close to the rear end of the sliding part, and the inner hole and the inner cavity can be communicated when the communication openings slide into the inner cavity along with the sliding part.

The technical scheme has the advantages that: because the sealing member is including the gliding sliding part of first water conservancy diversion mouth, first water conservancy diversion mouth can play the gliding effect of direction to sealing member in the inner chamber, because the rear end of sliding part is the blind end, the sliding part is the front end towards conflict portion for the open end rather than the hole intercommunication, the peripheral wall department circumference equipartition that the sliding part is close to its rear end has a plurality of intercommunication mouths, when the sliding part compresses tightly in first water conservancy diversion mouth department under the elastic component effect, be obstructed by the inner wall of first water conservancy diversion mouth between its a plurality of intercommunication mouths and the inner chamber, seal, when a plurality of intercommunication mouths slide to the inner chamber under the promotion of conflict portion along the sliding part, a plurality of intercommunication mouths can make inner chamber and hole intercommunication, thereby make urine can flow from first water conservancy diversion mouth along inner chamber, intercommunication mouths, sliding part hole in proper order. By adopting the sealing structure, urine needs to laterally enter the inner hole of the sliding part through the communication port at the outer peripheral wall of the sliding part and flow out of the first diversion port, and can not directly enter the first diversion port to flow out, and the action of the sealing piece is not easily influenced by the pressure of the urine, so that the urine is cut off more rapidly, and the outside air is difficult to enter the inner cavity along the inner hole of the sliding part, so that the urine collecting device is more sanitary to use.

As a further arrangement of the invention, the sealing element comprises a limiting part, the elastic part elastically presses the limiting part on the inner wall of the inner cavity corresponding to the periphery of the first diversion opening, a plurality of convex blocks are uniformly distributed on the rear end of the limiting part along the periphery of the center of the limiting part, the convex blocks can be pressed on the inner wall of the inner cavity corresponding to the periphery of the first diversion channel under the pushing of the abutting part, and gaps for urine to flow through are formed between the adjacent convex blocks at intervals.

The technical scheme has the advantages that: the setting of spacing portion can constitute spacing cooperation with the inner wall of the corresponding first water conservancy diversion mouth department all around of inner chamber to prevent that sealing member from deviating from forward from first water conservancy diversion mouth. The arrangement of the plurality of protruding blocks can be pushed by the abutting part to be pressed on the inner wall of the inner cavity corresponding to the periphery of the first diversion channel, so that gaps for urine to flow through are reserved between the sealing piece and the inner wall of the inner cavity corresponding to the periphery of the first diversion channel, the first diversion channel and the inner cavity are kept smooth, and the urine can flow more smoothly. And meanwhile, the outside air can be further prevented from entering the first diversion channel along the inner cavity, so that the air conditioner is more sanitary to use.

As a further arrangement of the invention, one end of the first diversion channel communicated with the inner cavity is provided with a flaring, the diameter of the flaring is slightly larger than that of the first diversion channel, an annular step surface is formed between the flaring and the first diversion channel, the elastic piece is a spring, one end of the spring is propped against the step surface, the other end of the spring is propped against the center of the limiting part and is surrounded by the plurality of protruding blocks, and the plurality of protruding blocks can be pushed by the propping part to be pressed on the inner wall of the inner cavity corresponding to the periphery of the flaring.

The technical scheme has the advantages that: one end of the spring is inserted in the flaring and abuts against the step surface, and the other end of the spring abuts against the center of the limiting part and is surrounded by the plurality of protruding blocks, so that the spring works more stably, displacement is not easy to occur, and the direction of elastic force is kept stable.

As a further arrangement of the invention, the second component comprises a second diversion channel and a second diversion port which are communicated with the catheter when the second component is in butt joint with the first component, a duckbill valve for preventing urine from flowing reversely is arranged at the second diversion port, the duckbill valve comprises a positioning part arranged at the second diversion port and a duckbill part extending into the second diversion channel, the diameter of the second diversion port is slightly larger than that of the second diversion channel, the positioning part of the duckbill valve is made of flexible materials and is annular, the annular positioning part is embedded in the second diversion port, and the positioning part can be pressed and positioned in the second diversion port when the first component is in butt joint with the second component, so that sealing fit of the joint of the first diversion port and the second diversion port is formed.

The technical scheme has the advantages that: the setting of duckbill valve can prevent that urine from flowing backward to catheter direction, because duckbill valve is including location portion and duckbill, through setting up location portion in second water conservancy diversion mouth department, stretches into the second water conservancy diversion passageway with the duckbill, makes the structure of second subassembly compacter, can reduce the volume. Because the diameter of the second diversion port is slightly larger than that of the second diversion channel, the positioning part of the duckbill valve can be embedded in the second diversion port and is pressed and positioned through the second component, and the duckbill valve is convenient to install and position. Because the locating part of duckbill valve is made and is the annular by flexible material, it can also form the sealed cooperation of first water conservancy diversion mouth and second water conservancy diversion mouth junction, prevents that urine from oozing in the gap of first water conservancy diversion mouth and second water conservancy diversion mouth junction.

As a further arrangement of the invention, the front end of the sealing member extends forward from the first guide opening and is formed with an extension portion which is in interference fit with the interference portion, and the interference portion is formed by the positioning portion.

The technical scheme has the advantages that: because the sealing member front end is stretched out forward from first water conservancy diversion mouth department and is formed with extension, just conflict portion by the location portion constitutes, and first subassembly and second subassembly are when the butt joint, the extension of first subassembly can be when with the location portion is inconsistent by the promotion towards the inner chamber direction motion, simultaneously the elastic component also can compress tightly the extension elasticity of sealing member on the location portion and make both junction form sealedly to can prevent that drainage from oozing from conflict department between extension and the location portion.

Drawings

FIG. 1 is a block diagram of an embodiment of the present invention;

FIG. 2 is an exploded view of an embodiment of the present invention;

FIG. 3 is a cross-sectional view of an embodiment of the present invention;

FIG. 4 is a cross-sectional view of the first assembly in a first use condition according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of the first assembly in a second use configuration according to an embodiment of the present invention;

FIG. 6 is a block diagram of a first component according to an embodiment of the present invention;

FIG. 7 is a block diagram of a seal in an embodiment of the invention;

FIG. 8 is a use state diagram of an embodiment of the present invention;

FIG. 9 is a schematic diagram of a first implementation identified in an example of the present invention;

Fig. 10 is a schematic diagram of a second implementation identified in an example of the invention.

Detailed Description

An embodiment of an adapter for a urinary catheter of the invention is shown in the drawings: the urine bag comprises an adapter body, wherein a first connector 100 capable of being connected and conducted with a urine bag 3 and a second connector 200 capable of being connected and conducted with a urine bag 42 are arranged on the adapter body, wavy line lines (not shown in the figure) for increasing friction force during insertion are arranged on the first connector 100 and the second connector 200, the adapter body comprises an observation chamber 23 communicated with the second connector 200, the observation chamber 23 is defined by an outer wall 23a with transparent periphery, the whole adapter body is made of transparent materials, a diversion connector 24 communicated with the observation chamber 23 is arranged on the adapter body, the diversion connector 24 is used for being inserted and conducted with a water injection port 31 of the balloon 32, a one-way sealing mechanism 33 is arranged at the water injection port 31 of the balloon 32, the one-way sealing mechanism 33 can enable the balloon 32 to be communicated with the observation chamber 23 when the diversion connector 24 is inserted along the water injection port 31 of the balloon, the lower part of the observation chamber 23 is communicated with the second connector 200, liquid in the observation chamber 23 can flow into the urine bag 41 along the second connector 200, and the inner wall of the observation chamber 23 is provided with a vent 231 communicated with the outside.

The adapter body is detachably provided with a sealing cap 8 capable of covering the diversion connector 24 and the vent hole 231 at the same time. The adaptor body is provided with a disc-shaped table top 25 corresponding to the diversion connector 24 and the vent hole 231, and the sealing cap 8 can be screwed on the table top 25 through threads so as to isolate the diversion connector 24 and the vent hole 231 from the outside. When it is desired to drain the balloon 32, the sealing cap 8 is removed to facilitate docking of the flow-directing connector 24 with the balloon water injection port 31 and to facilitate air entry into the viewing chamber 23 along the vent 231.

The end of the vent hole 231 facing the observation chamber 23 is provided with a waterproof air inlet member 232 capable of allowing air to enter the observation chamber 23 along the vent hole 231 and preventing liquid in the observation chamber 23 from overflowing outwards along the vent hole 231, and the waterproof air inlet member 232 may be a waterproof air permeable membrane capable of allowing air to pass through only or may be a one-way check member allowing air and liquid to enter the observation chamber 23 only, and in this embodiment, the waterproof air inlet member 232 adopts a duckbill-shaped one-way check member.

The observation chamber 23 is provided therein with a marker that moves with the flow of the liquid.

For the convenience of observation, the marker may be a swinging member 91 disposed at the inner wall of the observation chamber 23, the swinging member 91 is disposed near the diversion joint 24 (as shown in fig. 9), when the liquid in the balloon is sprayed on the swinging member 91 along the diversion joint 24, the swinging member 91 can swing up and down, and whether the liquid in the balloon is drained can be simply and intuitively determined by observing the movement condition of the swinging member 91. Of course, the marker may be a plurality of beads 92 (as shown in fig. 10) disposed in the observation chamber 23, and the beads 92 may be movable with the flow of the liquid.

The adapter body comprises a first component 1 and a second component 2, the first connector 100 is arranged on the first component 1, the second connector 200, the diversion connector 24 and the observation chamber 23 are all arranged on the second component 2, the first component 1 comprises a first diversion channel 11 and a first diversion port 12 which are communicated with the urine bag 42 when the first component 2 is in butt joint, one end of the first diversion channel 11 is communicated with the first diversion port 12 through an inner cavity 13, the other end of the first diversion channel 11 is provided with a through hole on the first connector 100, a sealing piece 5 and an elastic piece 6 which is used for elastically pressing the sealing piece 5 at the first diversion port 12 to seal the sealing piece, the second component 2 comprises an abutting part a, and the abutting part a can push the sealing piece 5 to move towards the direction opposite to the acting force of the elastic piece 6 when the first component 1 and the second component 2 are in butt joint, and the first diversion port 12 is opened, so that the urine bag 3 and the urine bag 42 are communicated.

The sealing member 5 includes a sliding portion 51 capable of sliding along the first conduction port 12, the sliding portion 51 is capable of sliding along the direction of the inner cavity 13 under the pushing of the abutting portion a, the sliding portion 51 is of a tubular structure with an inner hole 511, the rear end of the sliding portion 51 is a closed end, the front end of the sliding portion 51 facing the abutting portion a is an open end communicating with the inner hole 511, a plurality of communication ports 512 are circumferentially distributed on the peripheral wall of the sliding portion 51 near the rear end, the communication ports 512 can be communicated with the inner hole 511 and the inner cavity 13 when the sliding portion 51 slides into the inner cavity 13, and the communication ports 512 can be closed by being matched with the inner wall of the first conduction port 12 when the sliding portion 51 slides into the first conduction port 12.

The sealing member 5 includes a limiting portion 52, the elastic member 6 elastically compresses the limiting portion 52 against the inner wall of the inner cavity 13 corresponding to the periphery of the first diversion opening 12, a plurality of protrusions 53 are circumferentially and uniformly distributed at the rear end of the limiting portion 52 along the center thereof, the protrusions 53 can be compressed against the inner wall of the inner cavity 13 corresponding to the periphery of the first diversion channel 11 under the pushing of the abutting portion a, and gaps 54 (as shown in fig. 7) for flowing urine are formed between the adjacent protrusions 53 at intervals.

The one end that first water conservancy diversion passageway 11 and inner chamber 13 are linked together is provided with flaring 111, and the diameter of this flaring 111 is slightly greater than the diameter of first water conservancy diversion passageway 11 and is formed with annular step surface 1111 between the two, elastic component 6 is the spring, and the one end of spring supports to establish on step surface 1111, and the other end of spring supports to establish limit part 52 center department and is surrounded by a plurality of lugs 53, a plurality of lugs 53 can compress tightly the inner wall department around corresponding flaring 111 in inner chamber 13 under conflict portion a promotes.

The second component 2 comprises a second diversion channel 21 and a second diversion port 22 which are used for being communicated with the catheter 3 when the second component 1 is in butt joint, one end of the second diversion channel 21 is connected with the second diversion port 22, a duckbill valve 7 for preventing urine from flowing backwards is arranged at the second diversion port 22, the duckbill valve 7 comprises a positioning part 71 arranged at the second diversion port 22 and a duckbill 72 extending into the second diversion channel 21, the diameter of the second diversion port 22 is slightly larger than that of the second diversion channel 21, the positioning part 71 of the duckbill valve 7 is made of flexible materials and is annular, the annular positioning part 71 is embedded in the second diversion port 22, and the positioning part 71 can be pressed and positioned in the second diversion port 22 when the first component 1 is in butt joint with the second component 2, so that the sealing fit of the connection of the first diversion port 12 and the second diversion port 22 is formed, and the other end of the second diversion channel 21 is communicated with the second joint 200.

The front end of the sealing member 5 protrudes forward from the first flow guiding port 12 and forms an extension 51a that is in interference fit with the interference portion a, and the interference portion a is formed by the positioning portion 71 (as shown in fig. 2 and 3). The positioning portion 71 contacts with the extending portion 51a while the first and second modules 1 and 2 are connected, and pushes the seal 5 to slide in the direction of the cavity 13, and the length of the extending portion 51a is the sliding distance of the seal 5.

The first component 1 is formed with a protrusion 110 corresponding to the first diversion port 12, the second component 2 is formed with a groove 220 corresponding to the protrusion 110 corresponding to the second diversion port 22, and the protrusion 110 of the first component 1 and the groove 220 of the second component 2 are preferably in detachable connection through threaded fit, which can be achieved through interference insertion.

The above examples are only one of the preferred embodiments of the present invention, and the ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the scope of the present invention.

Claims

1. The utility model provides an adapter of catheter, including the adapter body, be provided with on the adapter body and be connected the first joint that switches on, can be connected the second joint that switches on with the urine bag with the catheter, its characterized in that: the adapter body comprises an observation chamber communicated with the second joint, the observation chamber is defined by an outer wall with transparent periphery, a flow guide joint communicated with the observation chamber is arranged on the adapter body and used for being connected and communicated with a balloon water injection port, and a vent hole communicated with the outside is arranged at the inner wall of the observation chamber; the adapter body is detachably provided with a sealing cap which can cover the diversion joint and the vent hole at the same time; the adapter body comprises a first component and a second component, the first connector is arranged on the first component, the second connector, the flow guiding connector and the observation chamber are all arranged on the second component, the first component comprises a first flow guiding channel and a first flow guiding port which are communicated with the urine bag when the adapter body is in butt joint with the second component, the first flow guiding channel and the first flow guiding port are communicated through an inner cavity, a sealing element is slidably arranged in the inner cavity, and an elastic element which elastically presses the sealing element at the first flow guiding port to seal the sealing element is arranged in the inner cavity, and the second component comprises an abutting part which can push the sealing element to move in the direction opposite to the acting force of the elastic element when the first component and the second component are in butt joint and enable the first flow guiding port to be opened; the sealing piece comprises a sliding part capable of sliding along the first diversion opening, the sliding part can slide towards the inner cavity direction under the pushing of the abutting part, the sliding part is of a tubular structure with an inner hole, the rear end of the sliding part is a closed end, the front end of the sliding part, which faces the abutting part, is an open end communicated with the inner hole of the sliding part, a plurality of communication openings are uniformly distributed on the peripheral wall of the sliding part, which is close to the rear end of the sliding part, in the circumferential direction, and the inner hole and the inner cavity can be communicated when the communication openings slide into the inner cavity along with the sliding part; the sealing piece comprises a limiting part, the elastic piece elastically presses the limiting part on the inner wall of the inner cavity corresponding to the periphery of the first diversion opening, a plurality of protruding blocks are uniformly distributed at the rear end of the limiting part along the periphery of the center of the limiting part, the protruding blocks can be pressed on the inner wall of the inner cavity corresponding to the periphery of the first diversion channel under the pushing of the abutting part, and gaps for urine to flow through are formed between the adjacent protruding blocks at intervals; the one end that first water conservancy diversion passageway and inner chamber are linked together is provided with the flaring, and the diameter of this flaring is slightly greater than the diameter of first water conservancy diversion passageway and is formed with annular step face between the two, the elastic component is the spring, and the one end of spring supports to be established on the step face, and the other end of spring supports to be established limit portion's center department and by a plurality of lugs are surrounded, a plurality of lugs can compress tightly the inner wall department around corresponding the flaring in the inner chamber under the promotion of conflict portion.

2. The catheter adapter of claim 1, wherein: the vent hole is provided with the waterproof air inlet component that can let the air get into and prevent liquid overflow towards the one end of viewing chamber.

3. The catheter adapter of claim 1, wherein: the observation chamber is provided with a marker which moves along with the flow of the liquid.

4. The catheter adapter of claim 1, wherein: the second assembly comprises a second diversion channel and a second diversion port, wherein the second diversion channel and the second diversion port are communicated with the catheter when the second assembly is in butt joint with the first assembly, a duckbill valve for preventing urine from flowing reversely is arranged at the second diversion port, the duckbill valve comprises a positioning part arranged at the second diversion port and a duckbill part extending into the second diversion channel, the diameter of the second diversion port is slightly larger than that of the second diversion channel, the positioning part of the duckbill valve is made of flexible materials and is annular, the annular positioning part is embedded in the second diversion port, and the positioning part can be pressed and positioned in the second diversion port when the first assembly is in butt joint with the second assembly, so that sealing fit of the joint of the first diversion port and the second diversion port is formed.

5. The catheter adapter of claim 4, wherein: the front end of the sealing piece extends forwards from the first guide opening and is provided with an extension part in interference fit with the interference part, and the interference part is formed by the positioning part.