Self-relieving safety catheter

Abstract

The application provides a self-pressure relief safety catheter, which comprises a main tube, an insertion tube, an elastic connecting tube and an air bag tube; the main tube has a first lumen, a second lumen and a third lumen inside; the insertion tube has an insertion tube lumen inside and a flow guide hole on the outer wall, which is communicated with the insertion tube lumen; the elastic connecting tube is communicated with the first lumen and the insertion tube lumen; the air bag tube is sleeved outside the elastic connecting tube and connected between the main tube and the insertion tube. In the initial state, the outer wall of the air bag tube is basically flush with the outer walls of the main tube and the insertion tube; after being inserted in place, water is injected into the air bag tube, and the air bag tube is inflated; when the main tube is pulled by mistake, the elastic connecting tube is quickly elongated, the outer diameter of the air bag tube is quickly reduced, and the water inside the air bag tube is quickly overflowed through the flow valve. The self-pressure relief safety catheter can reduce the extrusion of the air bag tube on the urethral mucosa, avoid the occurrence of serious complications such as urethral injury or tearing caused by accidental pulling of the catheter, and improve the safety and reliability of the catheter use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of urinary catheters, in particular to a self-pressure-relief safe urinary catheter. BACKGROUND

[0002] A urinary catheter is a medical consumable, usually made of silicone, latex or polyurethane, etc. materials, mainly used to drain urine from the bladder to the outside of the body. The urinary catheter is usually used in cases where the patient cannot urinate normally or has difficulty urinating, such as urinary retention, before and after surgery, postpartum recovery, urethral or bladder disease, long-term bedridden, coma and urinary incontinence, etc. In these cases, the urinary catheter can help the patient to empty the urine in the bladder, preventing complications such as overfilling of the bladder, pain and infection caused by urine retention.

[0003] The urinary catheter commonly used in clinical practice is a double-lumen urinary catheter, as shown in Figure 9 and Figure 10 , the double-lumen urinary catheter is usually composed of a head-end tube 01, a balloon 02, a urinary catheter main tube 03, a urine bag connecting tube 04 and a water injection tube 05, wherein the head-end tube 01 is designed with a smooth tip to reduce resistance during insertion; the balloon 02 is used to fix the urinary catheter in the bladder to prevent disengagement; the urinary catheter main tube 03 is soft and has a certain flexibility to adapt to the curvature of the urethra; the urine bag connecting tube 04 is used to connect the urine bag; the water injection tube 05 is used to inject water into the balloon 02. The operation steps for using the double-lumen urinary catheter in patients are as follows: apply appropriate lubricating oil or paraffin oil on the surface of the urinary catheter to reduce friction and pain during insertion; hold the urinary catheter with forceps and gently insert it into the urethral orifice and into the bladder until urine flows out; after the urinary catheter is completely inserted, inject an appropriate amount of sterile normal saline into the balloon 02 through the water injection tube 05 to make the balloon 02 expand and fix at the urethral orifice. Although the double-lumen urinary catheter is commonly used in clinical practice, there are still certain safety hazards. When the urinary catheter is inserted in place, the balloon 02 is inflated by injecting normal saline into it through the water injection tube 05 to be clamped at the junction of the bladder and the urethra. If the patient accidentally pulls the urinary catheter outward (usually a momentary outward pull with greater force), the inflated balloon 02 quickly enters the urethra or is directly pulled out of the body through the urethra under the action of the pulling force, which can cause excessive compression of the urethral mucosa and cause urethral injury or urethral laceration, causing serious harm to the patient (as shown in Figure 11 ).

[0004] Therefore, how to design a urinary catheter that can avoid or reduce urethral injury or urethral laceration when the urinary catheter is accidentally pulled is a technical problem that has not been solved in the prior art. SUMMARY

[0005] Therefore, the present application aims to overcome the technical defects in the prior art that the double-lumen urinary catheter will inject normal saline into the balloon to achieve expansion and positioning after being inserted in place, and if the patient or others accidentally pull the urinary catheter at a high speed for a short time, it will cause urethral injury or urethral laceration, thereby causing serious harm to the patient, and thus provides a self-pressure relief safety urinary catheter that can avoid or reduce urethral injury or urethral laceration even if the urinary catheter is accidentally pulled.

[0006] To this end, the present application provides a self-pressure relief safety urinary catheter, comprising:

[0007] A main tube having a first lumen, a second lumen and a third lumen formed therein and not in communication with each other;

[0008] An insertion tube having an insertion tube lumen formed therein, and a flow guide hole formed on the outer wall thereof and in communication with the insertion tube lumen;

[0009] An elastic connecting tube connecting the first lumen and the insertion tube lumen;

[0010] An air bag tube sleeved outside the elastic connecting tube and connected between the main tube and the insertion tube, and in communication with the second lumen and the third lumen;

[0011] The main tube tail end is formed with a first connecting tube, a second connecting tube and a third connecting tube, the first connecting tube is in communication with the first lumen and used for connecting a urine bag, the second connecting tube is in communication with the second lumen and provided with a one-way valve at the tail end, and the third connecting tube is in communication with the third lumen and provided with an overflow valve at the tail end;

[0012] In the initial state, the outer wall of the air bag tube is substantially flush with the outer walls of the main tube and the insertion tube;

[0013] After being inserted in place, water is injected into the air bag tube through the second connecting tube and the second lumen, and the air bag tube expands;

[0014] When the main tube is pulled by mistake, the elastic connecting tube is quickly elongated, the maximum outer diameter of the water-injected air bag tube is quickly reduced, and the water inside the air bag tube is quickly overflowed through the third lumen, the third connecting tube and the overflow valve.

[0015] As a preferred solution, a portion forming the first lumen is outwardly convex to form a first connecting portion, a portion forming the insertion tube lumen is outwardly convex to form a second connecting portion, and both ends of the elastic connecting tube are sleeved and fixedly connected on the first connecting portion and the second connecting portion, respectively.

[0016] As a preferred solution, the end of the main pipe is formed with a first annular step, the end of the insertion pipe is formed with a second annular step, and the two ends of the air bag pipe are respectively sleeved and fixedly connected to the first annular step and the second annular step.

[0017] As a preferred solution, the two ends of the elastic connecting pipe are respectively connected to the first connecting part and the second connecting part through bonding.

[0018] And / or, the two ends of the air bag pipe are respectively connected to the first annular step and the second annular step through bonding.

[0019] As a preferred solution, the elastic connecting pipe is internally provided with a spiral support frame.

[0020] As a preferred solution, the spiral support frame is not retractable after being stretched.

[0021] As a preferred solution, the overflow valve comprises:

[0022] An overflow valve cover with a cylindrical inner cavity is mounted on the third connecting pipe, and an overflow hole is formed in the position of the side wall close to the third connecting pipe.

[0023] An overflow sealing member is installed inside the cylindrical inner cavity, the top end of which can be inserted into the water outlet of the third connecting pipe and can press and seal the water outlet.

[0024] An overflow elastic member is installed inside the cylindrical inner cavity, one end of which abuts against the bottom wall of the cylindrical inner cavity, and the other end abuts against the bottom of the overflow sealing member.

[0025] When the water pressure in the third connecting pipe is lower than the set value, the overflow sealing member is pressed and sealed against the water outlet under the pressing action of the overflow elastic member.

[0026] When the water pressure in the third connecting pipe is higher than the set value, the water flow pushes away the overflow sealing member and flows out through the overflow hole.

[0027] As a preferred solution, the one-way valve comprises:

[0028] A one-way valve pipe is hollow and has two open ends, one end being a liquid inlet end and the other end being a liquid outlet end.

[0029] A first inner flange is formed on the inner wall of the one-way valve pipe, dividing the inner cavity of the one-way valve pipe into a first inner cavity and a second inner cavity; the middle part of the first inner flange is formed with a communication hole, which communicates the first inner cavity and the second inner cavity.

[0030] The one-way valve core comprises a valve core rod and a first outer flange formed on the outer wall of the valve core rod, a part of the valve core rod and the first outer flange are installed inside the second inner cavity through an elastic member; another part of the valve core rod extends into the first inner cavity through the communication hole; under the elastic force of the elastic member, the first outer flange abuts against the first inner flange to realize sealing contact;

[0031] A step blocking portion is formed at the opening of the second inner cavity, one end of the elastic member abuts against the step blocking portion, and the other end abuts against the first outer flange;

[0032] The valve core cap is sleeved and installed at the end of the valve core rod located inside the first inner cavity; one end of the valve core cap towards the communication hole has a second outer flange in sliding sealing contact with the inner wall of the first inner cavity, and the other end is provided with a liquid inlet hole.

[0033] As a preferred solution, the first inner cavity is cylindrical, and the inner diameter is substantially the same as or slightly larger than the outer diameter of the injection nozzle of the syringe; the end face of the end of the valve core cap provided with the liquid inlet hole can block the injection nozzle of the syringe from the circumference, so that water from the syringe can enter through the liquid inlet hole without leakage.

[0034] As a preferred solution, the valve core rod is in a triangular prism structure, and the liquid inlet hole is provided at a position of the valve core cap not covered by the end face of the valve core rod;

[0035] And / or, the three edges of the valve core rod are in sliding contact with the inner wall of the communication hole;

[0036] And / or, the three edges of the valve core rod are in sliding contact with the outer outlet inner wall of the second inner cavity provided with the step blocking portion;

[0037] And / or, one end of the first outer flange towards the communication hole is sleeved and installed with a sealing gasket.

[0038] The technical solution provided by the present application has the following advantages:

[0039] The self-pressure-relief safety catheter of the application comprises a main tube, an insertion tube, an elastic connecting tube and an air bag tube; wherein the inside of the main tube is formed with a first lumen, a second lumen and a third lumen which are not communicated with each other; the inside of the insertion tube is formed with a catheter lumen, and the outer wall of the insertion tube is formed with a flow guide hole communicated with the catheter lumen; the elastic connecting tube is communicated with the first lumen and the catheter lumen; the air bag tube is sleeved outside the elastic connecting tube and connected between the main tube and the insertion tube, and communicated with the second lumen and the third lumen; the tail end of the main tube is formed with a first connecting tube, a second connecting tube and a third connecting tube, the first connecting tube is communicated with the first lumen and used for connecting a urine bag, the second connecting tube is communicated with the second lumen and provided at the tail end with a one-way valve, and the third connecting tube is communicated with the third lumen and provided at the tail end with an overflow valve.

[0040] In the initial state, the outer wall of the air bag tube is basically flush with the outer walls of the main tube and the insertion tube. When the self-pressure-relief safety catheter of the application is used for a patient, appropriate lubricating oil or paraffin oil is first applied on the surface of the catheter to reduce friction and pain during insertion, then the catheter is gently inserted into the bladder from the urethral orifice by using a forceps, until urine flows out; after being inserted in place, a syringe is used to inject water into the air bag tube through the second connecting tube and the second lumen, so that the air bag tube is inflated and fixed at the urethral orifice; during use, if the main tube is pulled by mistake, the elastic connecting tube is quickly elongated, the maximum outer diameter of the air bag tube after water injection is quickly reduced, and the water in the air bag tube is quickly overflowed through the third lumen, the third connecting tube and the overflow valve, so that the air bag tube returns to the initial state. The self-pressure-relief safety catheter of the application can quickly respond when the main tube is pulled by mistake, so that the maximum outer diameter of the air bag tube is quickly reduced, and the water in the air bag tube is timely overflowed and discharged, after the outer diameter of the air bag tube is quickly reduced, the extrusion of the air bag tube on the urethral mucosa is reduced, the occurrence of serious complications such as urethral injury or laceration caused by accidental pulling of the catheter is avoided, and the safety and reliability of the use of the catheter are improved.

[0041] The self-pressure-relief safety catheter of the application can accurately control the volume of the air bag tube after inflation in the bladder by reasonably regulating the relationship between the inflation size of the air bag tube and the overflow pressure of the overflow valve; when the inflation degree of the air bag tube exceeds the preset range, the excess water flow will be automatically discharged outward through the overflow valve, so as to ensure that the inflation size of the air bag tube in the bladder is within a reasonable range, and the optimal range is that the catheter can prevent sliding out, and the volume is not too large compared with the urethral orifice (at present, it is usually difficult to control, and the case of too large is more common, refer to Figure 10When the catheter is pulled out by accident, the elastic connecting tube is slightly deformed, so that the maximum outer diameter of the balloon tube is reduced to not damage the urethra, or a small amount of water overflowed from the overflow valve can make the maximum outer diameter of the balloon tube smaller to not damage the urethra. There is also a situation of slow pulling of the urinary catheter causing injury (commonly seen in patients with impaired consciousness), when slowly pulling, the elastic connecting tube is difficult to deform, and the water in the balloon tube can be discharged from the overflow valve, and after discharge, the outer diameter of the balloon tube can be reduced to not damage the urethra, preventing the urinary catheter from being pulled by slow external force and causing damage to the urethra of the patient. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the prior art or the specific embodiments of the present application, the drawings used in the description of the prior art or the specific embodiments will be briefly introduced below.

[0043] Figure 1 is a schematic diagram of the overall structure of the self-pressure relief safety urinary catheter of the present application.

[0044] Figure 2 is a sectional view of Figure 1 .

[0045] Figure 3 is an enlarged structural schematic diagram of part C in Figure 2 .

[0046] Figure 4 is an exploded structural schematic diagram of part D in Figure 1 .

[0047] Figure 5 is an enlarged structural schematic diagram of part A in Figure 2 .

[0048] Figure 6 is an enlarged structural schematic diagram of part B in Figure 2 .

[0049] Figure 7 is a sectional view of the one-way valve in Figure 1 .

[0050] Figure 8 is a structural schematic diagram of the one-way valve core in Figure 7 .

[0051] Figure 9 is a schematic diagram of a commonly used double-lumen urinary catheter in clinical practice.

[0052] Figure 10 is an enlarged schematic diagram of the head-end tube and the balloon in Figure 9 .

[0053] Figure 11 is an image of urethral injury caused by accidental pulling of the urinary catheter by the patient.

[0054] Signs: 01, head tube; 02, balloon; 03, catheter main tube 03; 04, urine bag connecting tube; 05, water injection tube; 1, main tube; 11, first lumen; 12, second lumen; 13, third lumen; 14, first connecting tube; 15, second connecting tube; 16, third connecting tube; 17, first connecting part; 18, first annular step; 2, air bag tube; 3, one-way valve; 31, one-way valve tube; 32, liquid inlet end; 33, liquid outlet end; 34, first inner flange; 35, first inner cavity; 36, second inner cavity; 37, communication hole; 38, step blocking part; 39, outer outlet; 4, overflow valve; 41, overflow valve cover; 42, cylindrical inner cavity; 43, overflow hole; 44, overflow sealing element; 45, overflow elastic element; 5, elastic connecting tube; 51, spiral support frame; 6, insertion tube; 61, insertion tube lumen; 62, flow guide hole; 63, second connecting part; 64, second annular step; 7, one-way valve core; 71, valve core rod; 72, first outer flange; 73, elastic element; 8, valve core cap; 81, second outer flange; 82, liquid inlet hole; 9, sealing gasket. DETAILED DESCRIPTION

[0055] In order to make the technical personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the technical personnel in the art without creative labor should belong to the scope of protection of the present application.

[0056] It should be noted that the terms "first", "second" and the like in the claims and the specification of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not limited to those clearly listed steps or units, but can also include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances. In addition, the meaning of the term "a plurality of" should be two and more than two. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0058] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Embodiments

[0059] The present embodiment provides a self-pressure relief safety catheter, which comprises a main tube 1, an insertion tube 6, an elastic connecting tube 5 and a balloon tube 2, as shown in FIGS. 1-5. Figures 1-3 The main tube 1 is internally formed with a first lumen 11, a second lumen 12 and a third lumen 13 which are not communicated with each other; the insertion tube 6 is internally formed with a cannula lumen 61, and an outer wall thereof is formed with a flow guide hole 62 which is communicated with the cannula lumen 61; the elastic connecting tube 5 is communicated with the first lumen 11 and the cannula lumen 61; the balloon tube 2 is sleeved outside the elastic connecting tube 5 and connected between the main tube 1 and the insertion tube 6, and is communicated with the second lumen 12 and the third lumen 13; the tail end of the main tube 1 is formed with a first connecting tube 14, a second connecting tube 15 and a third connecting tube 16, the first connecting tube 14 is communicated with the first lumen 11 and used for connecting a urine bag, the second connecting tube 15 is communicated with the second lumen 12 and provided at the tail end with a one-way valve 3, and the third connecting tube 16 is communicated with the third lumen 13 and provided at the tail end with an overflow valve 4.

[0060] In the initial state, the outer wall of the balloon tube 2 is substantially flush with the outer walls of the main tube 1 and the insertion tube 6. When using the self-pressure relief safety urinary catheter of the present embodiment on a patient, first apply appropriate lubricating oil or paraffin oil on the surface of the urinary catheter to reduce friction and pain during insertion, then hold the urinary catheter with a forceps and gently insert it into the urethral orifice and into the bladder until urine flows out; after insertion, use a syringe to inject water into the balloon tube 2 through the second connecting tube 15 and the second lumen 12, so that the balloon tube 2 expands and is fixed at the urethral orifice; during use, if the main tube 1 is pulled by mistake, the elastic connecting tube 5 quickly elongates, the maximum outer diameter of the water-filled balloon tube 2 quickly decreases, and the water in the balloon tube 2 quickly overflows through the third lumen 13, the third connecting tube 16, and the overflow valve 4, so that the balloon tube 2 returns to the initial state.

[0061] The self-pressure relief safety urinary catheter of the present embodiment can quickly respond when the main tube 1 is pulled by mistake, quickly reduce the maximum outer diameter of the balloon tube 2, and timely overflow and discharge the water in the balloon tube 2. After the outer diameter of the balloon tube 2 is quickly reduced, the extrusion of the balloon tube 2 on the urethral mucosa is reduced, which can avoid the occurrence of serious complications such as urethral injury or tearing caused by accidental pulling of the urinary catheter, and improve the safety and reliability of the use of the urinary catheter.

[0062] As shown in Figures 4-5 , the part forming the first lumen 11 is outwardly convex to form a first connecting portion 17, and the part forming the insertion tube lumen 61 is outwardly convex to form a second connecting portion 63, and the two ends of the elastic connecting tube 5 are respectively sleeved and fixedly connected on the first connecting portion 17 and the second connecting portion 63.

[0063] The end of the main tube 1 is formed with a first annular step 18, the end of the insertion tube 6 is formed with a second annular step 64, and the two ends of the balloon tube 2 are respectively sleeved and fixedly connected on the first annular step 18 and the second annular step 64. When the balloon tube 2 is fixed on the main tube 1 and the insertion tube 6, the outer wall at the connection is formed as a flat horizontal surface, which ensures safety, comfort, and smoothness during use, and can avoid discomfort or potential risks caused by uneven surfaces.

[0064] The two ends of the elastic connecting tube 5 are respectively connected with the first connecting portion 17 and the second connecting portion 63 by adhesive connection; the two ends of the balloon tube 2 are respectively connected with the first annular step 18 and the second annular step 64 by adhesive connection. The adhesive connection has good sealing performance, which can avoid liquid leakage and improve the safety during use.

[0065] As shown in Figure 5As shown, the elastic connecting tube 5 is internally provided with a spiral support frame 51 which is not retractable after being stretched. This characteristic of the spiral support frame 51 enables the spiral support frame 51 to maintain the stretched state after being stretched due to external force, thereby maintaining the outer diameter of the balloon tube 2 in a small range, avoiding accidental injury to the human body caused by sudden rebound of the elastic connecting tube 5, and improving the safety of use.

[0066] As shown in the drawings, Figure 6 As shown, the overflow valve 4 comprises an overflow valve cover 41, an overflow sealing element 44 and an overflow elastic element 45; wherein the overflow valve cover 41 has a cylindrical inner cavity 42, is installed on the third connecting tube 16, and the side wall near the third connecting tube 16 is provided with an overflow hole 43; the overflow sealing element 44 is installed inside the cylindrical inner cavity 42, the top end can be inserted into the water outlet of the third connecting tube 16, and can seal the water outlet; the overflow elastic element 45 is installed inside the cylindrical inner cavity 42, one end abuts against the bottom wall of the cylindrical inner cavity 42, and the other end abuts against the bottom of the overflow sealing element 44; when the water pressure in the third connecting tube 16 is lower than the set value, the overflow sealing element 44 is pressed and sealed by the overflow elastic element 45; when the water pressure in the third connecting tube 16 is higher than the set value, the water flow pushes away the overflow sealing element 44 and flows out through the overflow hole 43.

[0067] By scientifically and reasonably selecting and optimizing the elastic material of the balloon tube 2 and reasonably matching the overflow pressure of the overflow valve 4, the size of the balloon tube 2 after inflation in the bladder can be accurately controlled; when the inflation degree of the balloon tube 2 exceeds the preset range, the water flow will automatically discharge outward through the overflow valve 4, thereby ensuring that the inflation size of the balloon tube in the bladder is within a reasonable range. There is also a situation of injury caused by slowly pulling the urinary catheter (commonly seen in patients with blurred consciousness), and the elastic connecting tube is difficult to deform when slowly pulled. The water in the balloon tube 2 can be discharged from the overflow valve 4, and the outer diameter of the balloon tube 2 can be reduced to not damage the urethra after discharge, preventing the urinary catheter from being damaged due to the slow external force pulling the urinary catheter.

[0068] As shown in the drawings, Figures 7-8As shown, the one-way valve 3 comprises a one-way valve pipe 31, a first inner flange 34, a one-way valve core 7 and a valve core cap 8; wherein the one-way valve pipe 31 is hollow and has two open ends, one end being a liquid inlet end 32 and the other end being a liquid outlet end 33; the first inner flange 34 is formed on the inner wall of the one-way valve pipe 31, separating the inner cavity of the one-way valve pipe 31 into a first inner cavity 35 and a second inner cavity 36; a communication hole 37 is formed in the middle of the first inner flange 34, communicating the first inner cavity 35 and the second inner cavity 36; the one-way valve core 7 comprises a valve core rod 71 and a first outer flange 72 formed on the outer wall of the valve core rod 71, a part of the valve core rod 71 and the first outer flange 72 being installed inside the second inner cavity 36 through an elastic member 73; the other part of the valve core rod 71 extends into the first inner cavity 35 through the communication hole 37; under the elastic force of the elastic member 73, the first outer flange 72 abuts against the first inner flange 34 to realize sealing contact; a stepped blocking portion 38 is formed at the opening of the second inner cavity 36, one end of the elastic member 73 abutting against the stepped blocking portion 38 and the other end abutting against the first outer flange 72; the valve core cap 8 is sleeved and installed at the end of the valve core rod 71 inside the first inner cavity 35; one end of the valve core cap 8 towards the communication hole 37 has a second outer flange 81 in sliding sealing contact with the inner wall of the first inner cavity 35, and the other end is provided with a liquid inlet hole 82. When water is injected into the airbag tube 2, the injection nozzle of the syringe is extended from the liquid inlet end 32 of the one-way valve pipe 31 to abut against the valve core cap 8 and push the valve core cap 8 inward, the valve core cap 8 and the valve core rod 71 fixedly connected therewith jointly extrude the elastic member 73 to retract, thereby releasing the sealing of the first inner cavity 35 and the second inner cavity 36, allowing the first inner cavity 35 and the second inner cavity 36 to communicate and allowing water flow to pass; then the syringe is operated to inject water, the water flows through the liquid inlet hole 82, the first inner cavity 35, the second inner cavity 36, the liquid outlet end 32, enters the second connecting pipe 15, and then flows from the second connecting pipe 15 to the second lumen 12, and finally enters the airbag tube 2, so as to inflate the airbag tube 2.

[0069] The first inner cavity 35 is cylindrical, the inner diameter thereof being substantially the same as or slightly larger than the outer diameter of the injection nozzle of the syringe; the end face of the end of the valve core cap 8 provided with the liquid inlet hole 82 can block the injection nozzle of the syringe from the circumferential direction, so that water from the syringe can be injected through the liquid inlet hole 82 without leakage.

[0070] As Figure 8As shown, the valve core rod 71 is a triangular prism structure, the liquid inlet hole 82 is arranged at a position of the valve core cap 8 which is not covered by the end face of the valve core rod 71; the three edges of the valve core rod 71 are in sliding contact with the inner wall of the communication hole 37; the three edges of the valve core rod 71 are in sliding contact with the inner wall of the outer outlet 39 of the second inner cavity 36 provided with the stepped blocking part 38; the end of the first outer flange 72 towards the communication hole 37 is provided with a sealing gasket 9. The valve core rod 71 adopts the structure design of triangular prism, so that the valve core rod 71 can be stably fixed in the interior of the one-way valve pipe 31, avoiding the occurrence of the shaking phenomenon, and also allowing the smooth flow of water flow.

[0071] The self-pressure relief safety catheter in the embodiment is used as follows: in the initial state, the outer wall of the air bag tube 2 is basically flush with the outer walls of the main body tube 1 and the insertion tube 6. When the self-pressure relief safety catheter in the embodiment is used for a patient, appropriate lubricating oil or paraffin oil is first applied on the surface of the catheter to reduce friction and pain during insertion, then the catheter is held by forceps and gently inserted into the urethral orifice and into the bladder until urine flows out; after being inserted in place, the injection nozzle of the syringe is extended from the liquid inlet end 32 of the one-way valve pipe 31 to abut against the valve core cap 8, and the valve core cap 8 is pushed inward, the valve core cap 8 and the valve core rod 71 fixedly connected therewith jointly extrude the elastic member 73 to retract, thereby unsealing the first inner cavity 35 and the second inner cavity 36, allowing the first inner cavity 35 and the second inner cavity 36 to communicate and allowing water flow to pass; then the syringe is operated to inject water, the water flows through the liquid inlet hole 82, the first inner cavity 35, the second inner cavity 36, the liquid outlet end 32, enters the second connecting tube 15, and then flows from the second connecting tube 15 to the second lumen 12, and finally enters the air bag tube 2, so that the air bag tube 2 is inflated and fixed at the urethral orifice of the bladder; during the catheterization process, if the main body tube 1 is pulled by mistake, the elastic connecting tube 5 is quickly elongated, the maximum outer diameter of the air bag tube 2 after water injection is quickly reduced, and the water in the air bag tube 2 flows through the third lumen 13 and the third connecting tube 16 to the overflow valve 4, and pushes the overflow sealing member 44 to move downward to open the overflow hole 43, so that the water quickly overflows from the overflow hole 43, so that the air bag tube 2 returns to the initial state.

[0072] Obviously, the above embodiment is only an example for clear illustration, but not a limitation on the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The changes or variations derived therefrom are still within the protection scope of the technical scheme.

Claims

1. A self-relieving safety urinary catheter, characterized in that, include: The main tube (1) has a first cavity (11), a second cavity (12) and a third cavity (13) that are not interconnected. The insertion tube (6) has an insertion cavity (61) inside and a flow guide hole (62) communicating with the insertion cavity (61) on the outer wall. An elastic connecting tube (5) connects the first tube cavity (11) and the insertion tube cavity (61). The elastic connecting tube (5) is provided with a spiral support frame (51) inside. The spiral support frame (51) cannot be retracted after being stretched. An airbag tube (2) is sleeved on the outside of the elastic connecting tube (5) and connected between the main tube (1) and the insertion tube (6), communicating with the second cavity (12) and the third cavity (13); the end of the main tube (1) has a first annular step (18), and the end of the insertion tube (6) has a second annular step (64). The two ends of the airbag tube (2) are respectively sleeved and fixedly connected to the first annular step (18) and the second annular step (64), so that the outer wall of the connection remains flat. The main tube (1) has a first connecting tube (14), a second connecting tube (15) and a third connecting tube (16) at its tail end. The first connecting tube (14) is connected to the first tube cavity (11) and is used to connect the urine bag. The second connecting tube (15) is connected to the second tube cavity (12) and has a one-way valve (3) at its tail end. The one-way valve (3) includes a one-way valve tube (31), a first inner flange (34), a one-way valve core (7) and a valve core cap (8). The first inner flange (34) separates the one-way valve tube (31) into a first inner cavity (35) and a second inner cavity (36). The valve core rod (71) of the one-way valve core (7) is a triangular prism structure, and its three edges slide in contact with the connecting hole (37) and / or the inner wall of the outlet of the second inner cavity (36). The second outer flange of the valve core cap (8) slides and seals with the first inner cavity (35), and the other end is provided with an inlet hole (82). The third connecting pipe (16) is connected to the third pipe cavity (13) and is provided with an overflow valve (4) at its tail end. The overflow valve (4) includes an overflow valve cover (41), an overflow seal (44) and an overflow elastic element (45). The top of the overflow seal (44) is inserted into the outlet of the third connecting pipe (16) and presses against it to seal. When the water pressure is higher than the set value, the water flow will break the seal and overflow through the overflow hole (43). In the initial state, the outer wall of the airbag tube (2) is basically flush with the outer walls of the main tube (1) and the insertion tube (6); After insertion, water is injected into the airbag tube (2) through the second connecting tube (15) and the second lumen (12), and the airbag tube (2) inflates. When the main tube (1) is pulled by mistake, the elastic connecting tube (5) is quickly stretched, the maximum outer diameter of the airbag tube (2) after water injection is quickly reduced, and the water inside the airbag tube (2) overflows quickly through the third tube (13), the third connecting tube (16) and the overflow valve (4); The elastic material of the balloon tube (2) and the overflow pressure of the overflow valve (4) are reasonably matched, which can accurately control the size of the balloon tube (2) after it expands in the bladder; when the expansion degree of the balloon tube (2) exceeds the preset range, the water will automatically be discharged out through the overflow valve (4), thereby ensuring that the expansion size of the balloon tube (2) in the bladder is within a reasonable range, which is such that it can prevent the catheter from slipping out and the volume is not too much larger than the urethral opening; When slowly pulled, the elastic connecting tube (5) is difficult to deform, and the water in the balloon tube (2) can be discharged from the overflow valve (4). After discharge, the outer diameter of the balloon tube (2) can be reduced to not damage the urethra, thus preventing the urinary catheter from being damaged by slow external force.

2. The self-relieving safety catheter according to claim 1, characterized in that: The portion forming the first lumen (11) protrudes outward to form the first connecting part (17), and the portion forming the insertion lumen (61) protrudes outward to form the second connecting part (63). The two ends of the elastic connecting tube (5) are respectively sleeved and fixedly connected to the first connecting part (17) and the second connecting part (63).

3. The self-relieving safety catheter according to claim 2, characterized in that: The two ends of the elastic connecting tube (5) are respectively bonded to the first connecting part (17) and the second connecting part (63); And / or, the two ends of the airbag tube (2) are respectively bonded to the first annular step (18) and the second annular step (64).

4. The self-relieving safety urinary catheter according to claim 1, characterized in that, The overflow valve cover (41) has a cylindrical inner cavity (42) and is installed on the third connecting pipe (16). An overflow hole (43) is provided on the side wall near the third connecting pipe (16). The overflow seal (44) is installed inside the cylindrical inner cavity (42); The overflow elastic element (45) is installed inside the cylindrical inner cavity (42), with one end abutting against the bottom wall of the cylindrical inner cavity (42) and the other end abutting against the bottom of the overflow seal (44); When the water pressure in the third connecting pipe (16) is lower than the set value, the overflow seal (44) presses and seals the outlet under the pressure of the overflow elastic member (45).

5. The self-relieving safety urinary catheter according to claim 1, characterized in that, The one-way valve tube (31) is hollow and open at both ends, with one end being the liquid inlet (32) and the other end being the liquid outlet (33). The first inner flange (34) is formed on the inner wall of the one-way valve tube (31); a connecting hole (37) is formed in the middle of the first inner flange (34) to connect the first inner cavity (35) and the second inner cavity (36). The one-way valve core (7) has a first outer flange (72) formed on the outer wall of the valve core rod (71). A portion of the valve core rod (71) and the first outer flange (72) are installed inside the second inner cavity (36) through an elastic element (73). Another portion of the valve core rod (71) extends into the first inner cavity (35) through the connecting hole (37). Under the elastic force of the elastic element (73), the first outer flange (72) abuts against the first inner flange (34) to achieve a sealing contact. A stepped blocking portion (38) is formed at the opening of the second inner cavity (36). One end of the elastic member (73) abuts against the stepped blocking portion (38), and the other end abuts against the first outer flange (72). The valve core cap (8) is sleeved and installed on the end of the valve core rod (71) located inside the first inner cavity (35); the end of the valve core cap (8) facing the connecting hole (37) has a second outer flange (81) that slides and seals in contact with the inner wall of the first inner cavity (35).

6. The self-relieving safety catheter according to claim 5, characterized in that: The first inner cavity (35) is cylindrical, and its inner diameter is basically the same as or slightly larger than the outer diameter of the syringe nozzle. The end face of the valve core cap (8) with the liquid inlet hole (82) can block the syringe nozzle from the circumference, so that water from the syringe can be injected through the liquid inlet hole (82) without leakage.

7. The self-relieving safety catheter according to claim 5, characterized in that: The liquid inlet (82) is located on the valve core cap (8) at a position not covered by the end face of the valve core rod (71); And / or, a sealing gasket (9) is fitted onto one end of the first outer flange (72) facing the connecting hole (37).

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