Self-pressure-relief safety catheter

Abstract

The invention provides a self-pressure-relief safety catheter. The self-pressure-relief safety catheter comprises a main body tube, an insertion tube, an elastic connecting tube and an air bag tube, wherein a first pipe cavity, a second pipe cavity and a third pipe cavity are formed in the main body pipe; a guide hole communicated with the intubation tube cavity is formed in the outer wall of the intubation tube; the elastic connecting tube is communicated with the first tube cavity and the intubation tube cavity; the air bag pipe is arranged on the outer side of the elastic connecting pipe in a sleeving mode and connected between the main body pipe and the insertion pipe. In an 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, the air bag tube is filled with water and expands; when the main body pipe is pulled by mistake, the elastic connecting pipe is rapidly lengthened, the outer diameter of the air bag pipe is rapidly reduced, and water in the air bag pipe rapidly overflows through the flow valve. According to the self-pressure-relief safe urethral catheter, the extrusion of the air bag pipe on urethral mucosa can be reduced, serious complications such as urethral injury or tearing caused by accidental pulling of the urethral catheter are avoided, and the use safety and reliability of the urethral catheter are improved.

Description

Technical Field

[0001] The invention relates to the technical field of urinary catheters, and in particular to a self-decompression safety urinary catheter. Background Art

[0002] A urinary catheter is a medical consumable, usually made of silicone, latex or polyurethane, and is mainly used to drain urine from the bladder to the outside of the body. A urinary catheter is usually used when the patient is unable to urinate normally or has difficulty urinating, such as urinary retention, before and after surgery, postpartum recovery, urethra or bladder disease, long-term bedridden, coma, and urinary incontinence. In these cases, a urinary catheter can help patients empty the urine in the bladder and prevent complications such as bladder overfilling, pain, and infection caused by urine retention.

[0003] The commonly used urinary catheter in clinical practice is the double-lumen urinary catheter. Fig. 9 and Fig.10 As shown, a double-lumen urinary catheter is usually composed of a head end tube 01, a balloon 02, a main catheter 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 it from detaching; the main catheter tube 03 is soft and has a certain toughness to adapt to the curvature of the urethra; the urine bag connecting tube 04 is used to connect the urine bag; and the water injection tube 05 is used to inject water into the balloon 02. The operating steps for using a double-lumen urinary catheter on a patient are as follows: apply appropriate lubricating oil or paraffin oil on the surface of the urinary catheter to reduce friction and pain during insertion; use tweezers to hold the urinary catheter and gently insert it from the urethral opening into the bladder until urine flows out; when the urinary catheter is fully inserted, inject an appropriate amount of sterile saline into the balloon 02 through the water injection tube 05 to expand the balloon 02 and fix it at the bladder neck. Although double-lumen urinary catheters are commonly used in clinical practice, they still have certain safety hazards. When the urinary catheter is inserted into place, saline is injected into the balloon 02 through the water injection tube 05 to expand it. After it is stuck at the connection between the bladder and the urethra, if the patient accidentally pulls the urinary catheter outward (usually pulling it outward for a moment with great force), the expanded balloon 02 will quickly enter the urethra or be directly pulled out of the body through the urethra under the action of the pulling force. This process will excessively squeeze the urethral mucosa and cause urethral damage or urethral tearing, causing serious harm to the patient (reference Fig.11 as shown).

[0004] Therefore, how to design a urinary catheter that can avoid or reduce urethral damage or urethral tearing when the urinary catheter is accidentally pulled is a technical problem that has not yet been solved in the prior art. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect in the prior art that after the double-lumen catheter is inserted into place, physiological saline is injected into the balloon to achieve expansion limiting, and if the patient or others accidentally pull the catheter outward at high speed in a short period of time, urethral damage or urethral tear may be caused, thereby causing serious harm to the patient, thereby providing a self-depressurizing safety catheter that can avoid or reduce urethral damage or urethral tear even if the catheter is accidentally pulled.

[0006] To this end, the present invention provides a self-decompression safety catheter, comprising: The main body tube has a first lumen, a second lumen and a third lumen formed therein which are not connected to each other; The insertion tube has an insertion tube lumen formed inside and a flow guide hole communicating with the insertion tube lumen formed on the outer wall; An elastic connecting tube, connecting the first lumen and the cannula lumen; An airbag tube, which is sleeved on the outside of the elastic connecting tube, connected between the main tube and the insertion tube, and communicated with the second cavity tube and the third cavity tube; The tail end of the main body tube is formed with a first connecting tube, a second connecting tube and a third connecting tube, the first connecting tube is connected to the first tube cavity and is used to connect to the urine bag, the second connecting tube is connected to the second tube cavity and a one-way valve is arranged at the tail end, and the third connecting tube is connected to the third tube cavity and a relief valve is arranged at the tail end; In the initial state, the outer wall of the airbag tube is substantially flush with the outer walls of the main tube and the insertion tube; After being inserted into place, water is injected into the airbag tube through the second connecting tube and the second tube cavity, so that the airbag tube expands; When the main body tube is pulled by mistake, the elastic connecting tube is rapidly stretched, the maximum outer diameter of the airbag tube after water injection is rapidly reduced, and the water inside the airbag tube rapidly overflows through the third tube cavity, the third connecting tube and the overflow valve.

[0007] As a preferred solution, the part of the first lumen that bulges outward forms the first connecting part, the part of the cannula that bulges outward forms the second connecting part, and the two ends of the elastic connecting tube are respectively sleeved and fixedly connected to the first connecting part and the second connecting part.

[0008] As a preferred solution, a first annular step is formed at the end of the main body tube, a second annular step is formed at the end of the insertion tube, and both ends of the airbag tube are respectively sleeved and fixedly connected to the first annular step and the second annular step.

[0009] As a preferred solution, two ends of the elastic connecting tube are respectively connected to the first connecting part and the second connecting part by bonding; And / or, two ends of the airbag tube are respectively connected to the first annular step and the second annular step by bonding.

[0010] As a preferred solution, a spiral support frame is provided inside the elastic connecting tube.

[0011] As a preferred solution, the spiral support frame cannot be retracted after being stretched.

[0012] As a preferred solution, the overflow valve comprises: The overflow valve cover has a cylindrical inner cavity and is installed on the third connecting pipe. An overflow hole is opened on the side wall near the third connecting pipe. An overflow seal is installed inside the cylindrical inner cavity, and the top end of the overflow seal can be inserted into the water outlet of the third connecting pipe and can press and seal the water outlet; 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 of which abuts against the bottom of the overflow sealing member; When the water pressure in the third connecting pipe is lower than a set value, the overflow sealing member presses and seals the water outlet under the pressure of the overflow elastic member; When the water pressure in the third connecting pipe is higher than a set value, the water flow breaks the overflow seal and overflows through the overflow hole.

[0013] As a preferred solution, the one-way valve comprises: A one-way valve tube is hollow and open at both ends, one end is a liquid inlet end, and the other end is a liquid outlet end; A first inner flange is formed on the inner wall of the one-way valve tube to separate the inner cavity of the one-way valve tube into a first inner cavity and a second inner cavity; a connecting hole is formed in the middle of the first inner flange to connect the first inner cavity and the second inner cavity; A one-way valve core, comprising a valve core rod and a first outer flange formed on the outer wall of the valve core rod, wherein a portion of the valve core rod and the first outer flange are installed inside the second inner cavity through an elastic member; another portion of the valve core rod extends into the first inner cavity through the connecting hole; under the elastic force of the elastic member, the first outer flange abuts against the first inner flange to achieve sealing contact; 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; The valve core cap is sleeved and installed on the end of the valve core rod located inside the first inner cavity; the valve core cap has a second outer flange at one end facing the connecting hole that is in sliding and sealing contact with the inner wall of the first inner cavity, and a liquid inlet hole is opened at the other end.

[0014] As a preferred embodiment, the first inner cavity is cylindrical, and its inner diameter is substantially the same as or slightly larger than the outer diameter of the injection nozzle of the syringe; the end surface of the valve core cap at one end having the liquid inlet hole can circumferentially block the injection nozzle of the syringe, so that water from the syringe can be injected through the liquid inlet hole without leaking.

[0015] As a preferred solution, the valve core rod is a triangular prism structure, and the liquid inlet hole is opened at a position of the valve core cap that is not covered by the end surface of the valve core rod; And / or, the three corners of the valve core rod are in sliding contact with the inner wall of the connecting hole; And / or, the three edges and corners of the valve core rod are in sliding contact with the inner wall of the outer outlet of the second inner cavity provided with the step blocking portion; And / or, a sealing gasket is sleeved and installed on one end of the first outer flange facing the connecting hole.

[0016] The technical solution provided by the present invention has the following advantages: The self-decompression safety urinary catheter of the present invention comprises a main body tube, an insertion tube, an elastic connecting tube and an air bag tube; wherein the main body tube is formed with a first tube cavity, a second tube cavity and a third tube cavity which are not connected to each other; the insertion tube is formed with an insertion tube cavity, and a guide hole connected with the insertion tube cavity is formed on the outer wall; the elastic connecting tube is connected with the first tube cavity and the insertion tube cavity; the air bag tube is sleeved on the outer side of the elastic connecting tube, connected between the main body tube and the insertion tube, and connected with the second cavity tube and the third cavity tube; the tail end of the main body tube is formed with a first connecting tube, a second connecting tube and a third connecting tube, the first connecting tube is connected with the first tube cavity and is used for connecting with a urine bag, the second connecting tube is connected with the second tube cavity and a one-way valve is arranged at the tail end, and the third connecting tube is connected with the third tube cavity and a relief valve is arranged at the tail end.

[0017] In the initial state, the outer wall of the balloon tube is substantially flush with the outer walls of the main tube and the insertion tube. When the self-decompression safety catheter of the present invention is used on a patient, first apply appropriate lubricating oil or paraffin oil on the surface of the catheter to reduce friction and pain during insertion, then clamp the catheter with tweezers and gently insert it into the bladder from the urethral opening until urine flows out; after the insertion is in place, use a syringe to inject water into the balloon tube through the second connecting tube and the second tube cavity, so that the balloon tube expands and is fixed at the bladder neck; during use, if the main tube is pulled by mistake, the elastic connecting tube is rapidly stretched, the maximum outer diameter of the balloon tube after water injection is rapidly reduced, and the water inside the balloon tube is rapidly overflowed through the third tube cavity, the third connecting tube and the overflow valve, so that the balloon tube returns to its initial state. The self-decompression safety urinary catheter of the present invention can respond quickly 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 can be discharged in time. After the outer diameter of the air bag tube is quickly reduced, the squeezing of the urethral mucosa by the air bag tube can be reduced, avoiding the occurrence of serious complications such as urethral injury or tearing caused by accidental pulling of the urinary catheter, thereby improving the safety and reliability of the use of the urinary catheter.

[0018] The self-releasing safety urinary catheter of the present invention can accurately control the volume of the bladder tube after expansion in the bladder by reasonably regulating the relationship between the expansion size of the airbag tube and the overflow pressure of the overflow valve; when the expansion degree of the airbag tube exceeds a preset range, the excess water flow will automatically be discharged outward through the overflow valve, thereby ensuring that the expansion size of the airbag tube in the bladder is within a reasonable range, and the optimal range is to prevent the urinary catheter from slipping out and the volume will not be too much larger than the urethral opening (it is usually difficult to control at present, and the situation of being too large is more common, refer to Fig.10 As shown in the figure, when the catheter is accidentally removed, the elastic connecting tube will deform slightly, which can reduce the maximum outer diameter of the balloon tube to a level that does not damage the urethra, or a small amount of water can overflow from the overflow valve to reduce the maximum outer diameter of the balloon tube to a level that does not damage the urethra. There are also cases where the catheter is injured by slowly pulling it (usually more common in patients with blurred consciousness). When it is pulled slowly, the elastic connecting tube is difficult to deform, and the water in the balloon tube can be discharged from the overflow valve. After the discharge, the outer diameter of the balloon tube can be reduced to a level that does not damage the urethra, preventing the catheter from being damaged by slow external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the prior art or the specific implementation manner of the present invention, the drawings used in the description of the prior art or the specific implementation manner are briefly introduced below.

[0020] Figure 1 It is a schematic diagram of the overall structure of the self-pressure relief safety urinary catheter of the present invention.

[0021] Figure 2 yes Figure 1 sectional view of .

[0022] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part C.

[0023] Figure 4 yes Figure 1 Schematic diagram of the explosion structure of part D.

[0024] Figure 5 yes Figure 2 Schematic diagram of the enlarged structure of part A.

[0025] Figure 6 yes Figure 2 Schematic diagram of the enlarged structure of part B.

[0026] Figure 7 yes Figure 1 Cross-sectional view of the one-way valve.

[0027] Figure 8 yes Figure 7 Schematic diagram of the structure of the one-way valve core.

[0028] Fig. 9 This is a schematic diagram of a double-lumen urinary catheter commonly used in clinical practice.

[0029] Fig.10 yes Fig. 9 Magnified schematic diagram of the mid-tip tube and balloon.

[0030] Fig.11 This is an image of a patient who sustained urethral injury due to accidental pulling of the catheter.

[0031] Figure numerals: 01, head end tube; 02, balloon; 03, urinary catheter main tube 03; 04, urine bag connecting tube; 05, water injection tube; 1, main tube; 11, first tube cavity; 12, second tube cavity; 13, third tube cavity; 14, first connecting tube; 15, second connecting tube; 16, third connecting tube; 17, first connecting part; 18, first annular step; 2, balloon 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, Connecting hole; 38, step blocking part; 39, external outlet; 4, overflow valve; 41, overflow valve cover; 42, cylindrical inner cavity; 43, overflow hole; 44, overflow sealing member; 45, overflow elastic member; 5, elastic connecting tube; 51, spiral support frame; 6, insertion tube; 61, insertion tube cavity; 62, 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 member; 8, valve core cap; 81, second outer flange; 82, liquid inlet hole; 9, sealing gasket. DETAILED DESCRIPTION

[0032] In order to make those skilled in the art better understand the present solution, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the claims and description of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not limited to those steps or units clearly listed, but may also include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly intended 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 being used to indicate orientation or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the term "multiple" should mean two or more. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

[0035] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Example

[0036] This embodiment provides a self-decompression safety catheter, such as Figure 1-3As shown in Figure 5, it comprises: a main body tube 1, an insertion tube 6, an elastic connecting tube 5 and an airbag tube 2; wherein, a first tube cavity 11, a second tube cavity 12 and a third tube cavity 13 which are not connected to each other are formed inside the main body tube 1; a cannula tube cavity 61 is formed inside the insertion tube 6, and a guide hole 62 which is connected to the cannula tube cavity 61 is formed on the outer wall; the elastic connecting tube 5 is connected to the first tube cavity 11 and the cannula tube cavity 61; the airbag tube 2 is sleeved on the outside of the elastic connecting tube 5, and is connected between the main body tube 1 and the insertion tube 6, and is connected to the second cavity tube 12 and the third cavity tube 13; a first connecting tube 14, a second connecting tube 15 and a third connecting tube 16 are formed at the tail end of the main body tube 1, the first connecting tube 14 is connected to the first tube cavity 11 and is used to connect a urine bag, the second connecting tube 15 is connected to the second tube cavity 12 and a one-way valve 3 is arranged at the tail end, and the third connecting tube 16 is connected to the third tube cavity 13 and a relief valve 4 is arranged at the tail end.

[0037] 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 the self-decompression safety catheter of this embodiment is used on a patient, first apply appropriate lubricating oil or paraffin oil on the surface of the catheter to reduce friction and pain during insertion, then clamp the catheter with tweezers and gently insert it into the bladder from the urethral opening 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 tube cavity 12, so that the balloon tube 2 expands and is fixed at the bladder neck; during use, if the main tube 1 is pulled by mistake, the elastic connecting tube 5 is rapidly stretched, and the maximum outer diameter of the balloon tube 2 after water injection is rapidly reduced, and the water inside the balloon tube 2 is rapidly overflowed through the third tube cavity 13, the third connecting tube 16 and the overflow valve 4, so that the balloon tube 2 returns to the initial state.

[0038] The self-depressurizing safety urinary catheter of this embodiment can respond quickly when the main tube 1 is pulled by mistake, so that the maximum outer diameter of the air-bag tube 2 can be quickly reduced, and the water in the air-bag tube 2 can be discharged in time. After the outer diameter of the air-bag tube 2 is quickly reduced, the squeezing of the urethral mucosa by the air-bag tube 2 can be reduced, avoiding the occurrence of serious complications such as urethral injury or tearing due to accidental pulling of the catheter, thereby improving the safety and reliability of the use of the catheter.

[0039] like Figure 4-5 As shown, the part of the first lumen 11 that bulges outward forms the first connecting portion 17, and the part of the insertion tube lumen 61 that bulges outward forms the second connecting portion 63. The two ends of the elastic connecting tube 5 are respectively sleeved and fixedly connected to the first connecting portion 17 and the second connecting portion 63.

[0040] The end of the main body 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 airbag tube 2 are respectively sleeved and fixedly connected to the first annular step 18 and the second annular step 64. When the airbag tube 2 is fixed to the main body tube 1 and the insertion tube 6, the outer wall of the connection forms a flat horizontal surface, ensuring safety, comfort and smoothness during use, and avoiding discomfort or potential risks caused by uneven surfaces.

[0041] The two ends of the elastic connecting tube 5 are respectively connected to the first connecting portion 17 and the second connecting portion 63 by bonding; the two ends of the airbag tube 2 are respectively connected to the first annular step 18 and the second annular step 64 by bonding. The bonding connection has good sealing performance, can avoid liquid leakage, and improves safety during use.

[0042] like Figure 5 As shown, a spiral support frame 51 is arranged inside the elastic connecting tube 5, and the spiral support frame 51 cannot be retracted after being stretched. This characteristic of the spiral support frame 51 enables the spiral support frame 51 to always maintain a stretched state after being stretched by an external force, thereby maintaining the outer diameter of the airbag tube 2 within a smaller range, avoiding accidental injuries to the human body caused by sudden rebound of the elastic connecting tube 5, and improving the safety of use.

[0043] like Figure 6 As shown, the overflow valve 4 includes: an overflow valve cover 41, an overflow seal 44 and an overflow elastic member 45; wherein the overflow valve cover 41 has a cylindrical inner cavity 42, which is installed on the third connecting pipe 16, and an overflow hole 43 is opened on the side wall near the third connecting pipe 16; the overflow seal 44 is installed inside the cylindrical inner cavity 42, and the top end can be inserted into the water outlet of the third connecting pipe 16, and can press and seal the water outlet; the overflow elastic member 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 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 water outlet under the pressure of the overflow elastic member 45; when the water pressure in the third connecting pipe 16 is higher than the set value, the water flow flushes the overflow seal 44 and overflows through the overflow hole 43.

[0044] By scientifically and reasonably selecting and optimizing the elastic material of the balloon tube 2, and reasonably matching it with the overflow pressure of the overflow valve 4, the volume of the balloon tube 2 after expansion in the bladder can be accurately controlled; when the expansion degree of the balloon tube 2 exceeds the preset range, the water flow will automatically be discharged outward through the overflow valve 4, thereby ensuring that the expansion size of the balloon tube in the bladder is within a reasonable range. There are also cases where the urinary catheter is injured by slowly pulling (usually more common in patients with blurred consciousness). When slowly pulling, the elastic connecting tube is difficult to deform, and the water in the balloon tube 2 can be discharged from the overflow valve 4. After the discharge, the outer diameter of the balloon tube 2 can be reduced to not damage the urethra, preventing the urinary catheter from causing damage to the patient's urethra due to slow external force pulling.

[0045] like Figure 7-8 As shown, 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; wherein the one-way valve tube 31 is hollow and has two openings, one end is a liquid inlet end 32, and the other end is a liquid outlet end 33; the first inner flange 34 is formed on the inner wall of the one-way valve tube 31, and the inner cavity of the one-way valve tube 31 is divided into a first inner cavity 35 and a second inner cavity 36; a connecting hole 37 is formed in the middle of the first inner flange 34, connecting the first inner cavity 35 and the second inner cavity 36; the one-way valve core 7 includes a valve core rod 71 and a first outer flange 72 formed on the outer wall of the valve core rod 71, and a part of the valve core rod 71 and the first outer flange 72 are installed in the second inner cavity through an elastic member 73 36; the other part 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 member 73, the first outer flange 72 abuts against the first inner flange 34 to achieve sealing contact; a step blocking portion 38 is formed at the opening of the second inner cavity 36, one end of the elastic member 73 abuts against the step 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 in 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 is in sliding and 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 injecting water into the airbag tube 2, the injection nozzle of the syringe is extended from the liquid inlet end 32 of the one-way valve tube 31 to abut against the valve core cap 8, and the valve core cap 8 is pushed inward, and the valve core cap 8 and the valve core rod 71 fixedly connected thereto jointly squeeze the elastic member 73 to retract, thereby releasing the seal of the first inner cavity 35 and the second inner cavity 36, so that the first inner cavity 35 and the second inner cavity 36 are connected, allowing water to flow through; then the syringe is operated to inject water, and the water flows through the liquid inlet hole 82, the first inner cavity 35, the second inner cavity 36, the liquid outlet end 32, and enters the second connecting tube 15, and then flows from the second connecting tube 15 to the second tube cavity 12, and finally enters the airbag tube 2, causing the airbag tube 2 to expand.

[0046] The first inner cavity 35 is cylindrical, and its inner diameter is substantially the same as or slightly larger than the outer diameter of the injection nozzle of the syringe; the end surface of one end of the valve core cap 8 having the liquid inlet hole 82 can circumferentially block the injection nozzle of the syringe, so that water from the syringe can be injected through the liquid inlet hole 82 without leaking.

[0047] like Figure 8 As shown, the valve core rod 71 is a triangular prism structure, the liquid inlet hole 82 is opened at a position of the valve core cap 8 that is not covered by the end surface of the valve core rod 71; the three corners of the valve core rod 71 are in sliding contact with the inner wall of the communication hole 37; the three corners 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 step blocking portion 38; the end of the first outer flange 72 facing the communication hole 37 is sleeved with a sealing gasket 9. The valve core rod 71 adopts a triangular prism structure design, so that the valve core rod 71 can be firmly fixed inside the one-way valve tube 31, avoiding the occurrence of sloshing, and allowing water to flow smoothly.

[0048] The self-pressure-releasing safety catheter in this embodiment is used as follows: 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-releasing safety catheter of this embodiment on a patient, first apply appropriate lubricating oil or paraffin oil on the surface of the catheter to reduce friction and pain during insertion, then use tweezers to clamp the catheter and gently insert it into the bladder from the urethral opening until urine flows out; when inserted into place, extend the injection nozzle of the syringe from the liquid inlet end 32 of the one-way valve tube 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 thereto jointly squeeze the elastic member 73 to retract, thereby releasing the seal on the first inner cavity 35 and the second inner cavity 36, so that the first inner cavity 35 and the second inner cavity 36 are connected, allowing water to flow through; then operate the syringe to Water is injected, and the water flows through the liquid inlet hole 82, the first inner cavity 35, the second inner cavity 36, the liquid outlet end 32, and enters the second connecting tube 15, and then flows from the second connecting tube 15 to the second tube cavity 12, and finally enters the airbag tube 2, so that the airbag tube 2 expands and is fixed at the bladder neck; during the catheterization process, if the main tube 1 is pulled by mistake, the elastic connecting tube 5 is rapidly stretched, and the maximum outer diameter of the airbag tube 2 after the water injection is rapidly reduced, and the water inside the airbag tube 2 flows to the overflow valve 4 through the third tube cavity 13 and the third connecting tube 16, and pushes the overflow seal 44 to move downward, opening the overflow hole 43, and the water overflows rapidly from the overflow hole 43, so that the airbag tube 2 returns to its initial state.

[0049] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of this innovative technical solution.

Claims

1. A self-decompression safety catheter, characterized in that: include: The main body tube (1) has a first tube cavity (11), a second tube cavity (12) and a third tube cavity (13) formed therein, which are not connected to each other; An insertion tube (6) having an insertion tube lumen (61) formed therein and a flow guide hole (62) in communication with the insertion tube lumen (61) formed on an outer wall; An elastic connecting tube (5) connecting the first tube cavity (11) and the cannula tube cavity (61); An airbag tube (2) is sleeved on the outside of the elastic connecting tube (5), connected between the main tube (1) and the insertion tube (6), and communicated with the second cavity tube (12) and the third cavity tube (13); The tail end of the main body 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 in communication with the first tube cavity (11) and is used to connect to a urine bag; the second connecting tube (15) is in communication with the second tube cavity (12) and a one-way valve (3) is provided at the tail end; the third connecting tube (16) is in communication with the third tube cavity (13) and a relief valve (4) is provided at the tail end; In the initial state, the outer wall of the airbag tube (2) is substantially flush with the outer walls of the main tube (1) and the insertion tube (6); After being inserted into place, water is injected into the airbag tube (2) through the second connecting tube (15) and the second tube cavity (12), so that the airbag tube (2) expands; When the main body tube (1) is pulled by mistake, the elastic connecting tube (5) is rapidly stretched, the maximum outer diameter of the airbag tube (2) after water injection is rapidly reduced, and the water inside the airbag tube (2) rapidly overflows through the third tube cavity (13), the third connecting tube (16) and the overflow valve (4).

2. The self-decompression safety catheter according to claim 1, characterized in that: The outer protrusion of the portion forming the first tube cavity (11) forms the first connecting portion (17), and the outer protrusion of the portion forming the insertion tube cavity (61) forms the second connecting portion (63). The two ends of the elastic connecting tube (5) are respectively sleeved on and fixedly connected to the first connecting portion (17) and the second connecting portion (63).

3. The self-decompression safety catheter according to claim 2, characterized in that: The end of the main body 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 airbag tube (2) are respectively sleeved and fixedly connected to the first annular step (18) and the second annular step (64).

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

5. The self-decompression safety urinary catheter according to claim 1, characterized in that: A spiral support frame (51) is arranged inside the elastic connecting tube (5).

6. The self-decompression safety urinary catheter according to claim 5, characterized in that: The spiral support frame (51) cannot be retracted after being stretched.

7. The self-decompression safety urinary catheter according to claim 1, characterized in that: The overflow valve (4) comprises: An overflow valve cover (41) having a cylindrical inner cavity (42) and mounted on the third connecting pipe (16), and having an overflow hole (43) formed on a side wall near the third connecting pipe (16); An overflow seal (44) is installed inside the cylindrical inner cavity (42), the top end of which can be inserted into the water outlet of the third connecting pipe (16) and can press and seal the water outlet; An overflow elastic member (45) is installed inside the cylindrical inner cavity (42), one end of which abuts against the bottom wall of the cylindrical inner cavity (42) and the other end of which abuts against the bottom of the overflow sealing member (44); When the water pressure in the third connecting pipe (16) is lower than a set value, the overflow sealing member (44) presses and seals the water outlet under the pressure of the overflow elastic member (45); When the water pressure in the third connecting pipe (16) is higher than a set value, the water flow breaks the overflow seal (44) and overflows through the overflow hole (43).

8. The self-decompression safety urinary catheter according to claim 1, characterized in that: The one-way valve (3) comprises: A one-way valve tube (31) is hollow and has two openings at both ends, one end being a liquid inlet end (32) and the other end being a liquid outlet end (33); A first inner flange (34) is formed on the inner wall of the one-way valve tube (31) to divide the inner cavity of the one-way valve tube (31) into a first inner cavity (35) and a second inner cavity (36); 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); A one-way valve core (7), comprising a valve core rod (71) and a first outer flange (72) formed on an outer wall of the valve core rod (71); a portion of the valve core rod (71) and the first outer flange (72) are mounted inside the second inner cavity (36) via an elastic member (73); another portion of the valve core rod (71) extends into the first inner cavity (35) via the connecting hole (37); under the elastic force of the elastic member (73), the first outer flange (72) abuts against the first inner flange (34) to achieve sealing contact; A step blocking portion (38) is formed at the opening of the second inner cavity (36), one end of the elastic member (73) abuts against the step blocking portion (38), and the other end abuts against the first outer flange (72); A valve core cap (8) is sleeved and mounted on the end of the valve core rod (71) located inside the first inner cavity (35); one end of the valve core cap (8) facing the connecting hole (37) has a second outer flange (81) in sliding and sealing contact with the inner wall of the first inner cavity (35), and the other end is provided with a liquid inlet hole (82).

9. The self-decompression safety urinary catheter according to claim 8, characterized in that: The first inner cavity (35) is cylindrical, and its inner diameter is substantially the same as or slightly larger than the outer diameter of the injection nozzle of the syringe; the end surface of one end of the valve core cap (8) having the liquid inlet hole (82) can circumferentially block the injection nozzle of the syringe, so that water from the syringe can be injected through the liquid inlet hole (82) without leaking.

10. The self-decompression safety urinary catheter according to claim 8, characterized in that: The valve core rod (71) is a triangular prism structure, and the liquid inlet hole (82) is provided at a position of the valve core cap (8) that is not covered by the end surface of the valve core rod (71); and / or, the three corners of the valve core rod (71) are in sliding contact with the inner wall of the connecting hole (37); and / or, the three corners 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 step blocking portion (38); And / or, a sealing gasket (9) is sleeved and installed on one end of the first outer flange (72) facing the connecting hole (37).

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