Catheterization structure

Abstract

The present application provides a urinary catheter structure, including an outer sheath tube with a drainage port, an inner core inserted in the outer sheath tube, and a balloon arranged at the distal end of the inner core, the balloon being positioned in the patient's bladder, and the outer sheath tube being able to be axially moved relative to the inner core by an external force, wherein when the drainage port of the outer sheath tube is located between the patient's sphincter and the bladder, the urine in the patient's bladder directly flows into the drainage port and is discharged, so as to provide an involuntary urination function, and when the drainage port of the outer sheath tube is located between the patient's sphincter and the external urethral opening, the urine in the bladder flows through the sphincter and enters the urethra, and then flows into the drainage port to be discharged through the urinary catheter passage, so as to provide an autonomous urination function. Thus, the present application can switch between providing autonomous urination and involuntary urination functions according to the actual use needs of the patient, and can effectively alleviate the patient's urinary tract irritation symptoms and reduce the risk of urinary tract infection.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of medical devices, and in particular to a urinary catheter structure for draining urine from a bladder. Background Art

[0002] At present, the most widely used catheter in clinical medicine is the Foley catheter invented in the 1930s. Compared with previous catheters, this type of catheter is soft, elastic, easy to fix, and waterproof, so it is still in use today. However, the current Foley catheter also has obvious defects, and the complications caused by these defects are also widely present in clinical practice.

[0003] For example, in 2002, the number of visits to doctors in the United States due to problems with Foley catheters alone reached 7 million, with direct and indirect losses reaching $1.6 billion. In addition, there are many incalculable pains caused to patients. These complications include catheter-related urinary tract infections and urinary tract irritation symptoms, which can also cause discomfort, prolonged illness, urethral strictures, bladder stones and other problems.

[0004] Through structural analysis of the Foley catheter, it can be found that the above problems are mainly caused by the structural design defects of the Foley catheter itself, which mainly include the following aspects: (1) the protruding part (i.e., the guide end) of the catheter at the bladder end is easy to poke the patient's bladder wall when the patient's bladder is empty or the patient changes position, thereby inducing bladder spasm or urinary tract irritation symptoms, and repeated poking of the bladder wall is also easy to damage the bladder epithelial protective structure, thereby causing urinary tract infection; (2) the spherical balloon structure at the bladder end of the catheter and the relative position of the drainage port make a small amount of urine accumulate between the catheter balloon and the bladder wall when the catheter is completely empty, becoming a stagnant urine. Stagnant water is also an important factor inducing urinary tract infection; (3) For catheters that need to be left in place for a short period of time, such as patients who need anesthesia during surgery, a catheter is usually placed in the urethra to help the patient drain urine from the bladder while unconscious; but when the patient regains consciousness and can move freely after the surgery, the patient can urinate autonomously. However, due to the need for disease management, the indwelling catheter cannot be removed immediately and still needs to be left in place for observation for a few days. Existing catheters do not have the function of converting involuntary urination to autonomous urination, so that on the one hand, the catheter will cause irritation in the urethra, and on the other hand, the urethral mucosa will secrete more under irritation, thereby increasing the risk of irritation and urinary tract infection.

[0005] Although some urinary catheter structures have been improved to address the above problems, none of them can systematically solve the urinary tract irritation symptoms of patients and the urinary catheter structure that can switch between autonomous and involuntary urination has appeared. In view of this, how to solve the various problems existing in the above-mentioned prior art is the technical issue to be solved in this case. Summary of the invention

[0006] In view of the above problems, the main purpose of the present application is to provide a urinary catheter structure that can provide a switching function between autonomous urination and involuntary urination to meet the different usage needs of patients.

[0007] Another object of the present application is to provide a urinary catheter structure that can relieve the patient's urinary tract irritation symptoms and reduce the risk of urinary tract infection.

[0008] The present application provides a urinary catheterization structure for providing a urinary catheterization function for a patient, comprising:

[0009] An outer sheath tube has an inner core passage and a urinary catheter passage inside, and the distal end of the outer sheath tube also has a drainage port connected to the urinary catheter passage; an inner core, which is inserted into the inner core passage and has an air injection passage, the distal end of the inner core extends from the inner core passage to be exposed to the outer sheath tube, and the outer sheath tube can be axially moved relative to the inner core under the action of external force; a balloon, which is arranged at the distal end of the inner core and is connected to the air injection passage, and air is injected through the air injection passage to make the balloon inflated, or air is exhausted through the air injection passage to make the balloon in deflated; wherein the balloon is arranged in the patient's bladder, and wherein when the outer sheath tube is close to the patient, the balloon is deflated. When the distal end of the inner core moves relative to the inner core so that the drainage port of the outer sheath tube is located between the patient's sphincter and the bladder, the urine in the bladder directly flows into the drainage port and is discharged through the urinary catheterization passage, thereby providing the patient with an involuntary urination function; when the outer sheath tube moves relative to the inner core in a direction away from the distal end of the inner core so that the drainage port of the outer sheath tube is located between the patient's sphincter and the external urethral opening, the urine in the bladder flows through the sphincter and enters the urethra, and then flows into the drainage port to be discharged through the urinary catheterization passage, thereby providing the patient with an autonomous urination function.

[0010] Optionally, in the above-mentioned embodiments of the present application, the urinary catheter structure further includes a balloon adjustment unit, which is disposed on the inner core or on the balloon and is used to adjust the expansion shape of the balloon when it is in the expanded state.

[0011] Optionally, in the above embodiments of the present application, the balloon includes a first end close to the distal end of the inner core and a second end away from the distal end of the inner core, and the balloon adjustment unit is used to form a groove on the outer surface of the balloon when the balloon is in the expanded state, and the groove extends from the first end of the balloon to the second end of the balloon, so as to guide the residual urine in the bladder from the first end of the balloon to the second end of the balloon through the groove.

[0012] Optionally, in the above-mentioned embodiments of the present application, the balloon includes a first end close to the distal end of the outer sheath tube and a second end away from the distal end of the outer sheath tube, and the balloon adjustment unit is used to make the balloon present an irregularly symmetrical balloon cross-sectional shape when it is in the expanded state, so as to guide the residual urine in the bladder from the first end of the balloon to the second end of the balloon.

[0013] Optionally, in the above-mentioned embodiments of the present application, there are multiple drainage ports, and each of the drainage ports is arranged on the outer sheath tube and close to the second end of the balloon, so that the residual urine guided to the second end of the balloon can flow into the drainage port and be discharged through the inner core passage.

[0014] Optionally, in the above-mentioned embodiments of the present application, the inner core also has a guide wire passage.

[0015] It can be seen from the above technical scheme that the catheter structure provided in the embodiment of the present application enables the outer sheath to move axially relative to the inner core so that the drainage port of the outer sheath is selectively located between the patient's sphincter and bladder or between the patient's sphincter and the external urethra, thereby switching the autonomous urination and involuntary urination functions of the catheter structure to meet the different usage requirements of the patient.

[0016] Furthermore, when the urinary catheter structure is used to provide patients with autonomous urination, the urine in the bladder can be discharged after flushing the patient's urethral mucosa, thereby alleviating the patient's urinary tract irritation symptoms and effectively reducing the risk of urinary tract infection.

[0017] In addition, by adjusting the expansion shape of the balloon when it is inflated, the residual fluid in the bladder can also be reduced to further reduce the risk of urinary tract infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1A and Figure 1B This is a schematic diagram of the overall structure of a urinary catheter structure according to an embodiment of the present application;

[0020] Figure 1C and Figure 1D for Figure 1A and Figure 1B A cross-sectional view of the catheter structure shown;

[0021] FIG. 2A to FIG. 2B Schematic diagrams showing different embodiments of the outer sheath of the urinary catheter structure of the present application;

[0022] Figure 2C A schematic diagram showing an embodiment of the drainage port of the urinary catheter structure of the present application;

[0023] Figure 3A and Figure 3B Schematic diagrams showing different embodiments of the inner core and balloon of the urinary catheter structure of the present application;

[0024] Figure 4A and Figure 4B A schematic diagram showing an embodiment of a balloon adjustment unit of the urinary catheter structure of the present application;

[0025] FIG. 5A to FIG. 5E A schematic diagram showing another embodiment of the balloon adjustment unit of the urinary catheter structure of the present application; and

[0026] FIG. 6A to FIG. 6C It is a schematic diagram showing another embodiment of the balloon adjustment unit of the urinary catheter structure of the present application.

[0027] Component number

[0028] 1 Catheterization structure

[0029] 11 Outer sheath

[0030] 111 Inner core passage

[0031] 112 Catheterization

[0032] 113 Drainage port

[0033] 114 urination port

[0034] 12 Inner core

[0035] 121 Gas injection channel

[0036] 122 Guidewire access

[0037] 123 Gas injection port

[0038] 124 Wire guide port

[0039] 125 Guide end

[0040] 13 Balloon

[0041] 131 First end of the balloon

[0042] 132 The second end of the balloon

[0043] 14 Balloon Adjustment Unit

[0044] 140 belt body

[0045] 141 Balloon Adjustment Device

[0046] 142 Adjustment parts

[0047] 143 Balloon Outer Kit

[0048] 144 Opening

[0049] 21 Bladder

[0050] 22 Sphincter

[0051] 23 Urethra DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0053] Please refer to Figures 1A to 1D , which is a schematic diagram showing the overall structure of a urinary catheter structure 1 of an embodiment of the present application. The urinary catheter structure 1 of the present application is arranged in the urethra of a patient to provide a urinary catheter function. As shown in the figure, the urinary catheter structure 1 mainly includes an outer sheath 11, an inner core 12, and a balloon 13.

[0054] Please refer to Figure 2A and Figure 2B The outer sheath tube 11 has an inner core passage 111 and a urinary catheter passage 112 (such as Figure 1C and Figure 1D As shown in the figure, the inner core passage 111 is used to provide the inner core 12 to pass therethrough, and the urinary catheter passage 112 is used to divert urine. As shown in the figure, a liquid discharge port 113 connected to the urinary catheter passage 112 is provided at the distal end of the outer sheath tube 11 (i.e., the end away from the user's operation), and a urinary discharge port 114 connected to the urinary catheter passage 112 is also provided at the proximal end of the outer sheath tube 11, so that urine in the patient's bladder can flow into the urinary catheter passage 112 through the liquid discharge port 113 and be discharged through the urinary discharge port 114.

[0055] like Figure 2C As shown, in one embodiment of the present application, the drainage port 113 can be set to be multiple and opened around the tube wall of the outer sheath 11. However, it is not limited to this. The specific location and number of the drainage port 113 can be adjusted according to actual needs.

[0056] Please refer to Figure 3A and Figure 3B The inner core 12 can be inserted into the inner core passage 111 of the outer sheath tube 11. Figure 1C and Figure 1D As shown, there is an air injection passage 121 inside the inner core 12, and the proximal end of the inner core 12 (i.e., the end close to the user's operation) is provided with an air injection port 123 connected to the air injection passage 121. The distal end of the inner core 12 extends out from the inner core passage 111 and is exposed to the outer sheath 11, and the outer sheath 11 can be axially moved relative to the inner core 12 by an external force. In the embodiment of the present application, the urination port 114 extends obliquely outward from the body of the outer sheath 11, so the urination port 114 can be used as an operating part to provide the user with a force to make the outer sheath 11 move axially relative to the inner core 12. However, this is not limited to this, and an independent operating part can also be set on the outer sheath 11 for the user to apply a force.

[0057] In another embodiment, a limiting portion (not shown) may be further provided on the inner core 12 to limit the maximum axial movement distance of the outer sheath tube 11 relative to the inner core 12 to ensure that the outer sheath tube 11 moves within a safe range.

[0058] Please continue reading Figure 1C and Figure 1D The inner core 12 may also be provided with a guide wire passage 122 axially penetrating the inner core 12, and a guide wire opening 124 connected to the guide wire passage 122 may be provided at the proximal end of the inner core 12. The guide wire passage 122 may be provided with a guide wire therethrough. In addition, a guide end 125 may be provided at the distal end of the inner core 12 to facilitate the technical effect of guiding the urinary catheter structure 1 when passing through the narrow and long urethra of the patient.

[0059] See also Figure 3A and Figure 3BThe balloon 13 is disposed at the distal end of the inner core 12 and is interconnected with the gas injection passage 121. The user can inject gas into the gas injection passage 121 through the gas injection port 123 located at the proximal end of the inner core 12 to switch the balloon 13 located at the distal end of the inner core 12 from a contracted state to an expanded state. The gas in the balloon 13 can also be discharged through the gas injection passage 121 and the gas injection port 123 to switch the balloon 13 from an expanded state to a contracted state. Preferably, when the balloon 13 located at the distal end of the inner core 12 is in an expanded state, the guide end 125 located at the end of the inner core 12 can be wrapped therein (such as Figure 3B As shown), when the patient's bladder is empty or when the patient changes position, the guide end 125 retracted in the balloon 13 is not easy to poke the patient's bladder, so as to minimize the stimulation of the bladder mucosa by the catheterization structure 1.

[0060] Please refer to Figure 4A and Figure 4B , Figure 5A and Figure 5B The specific method of using the urinary catheter structure 1 of the present application is as follows:

[0061] like Figure 1A As shown, in the initial state, the balloon 13 at the distal end of the inner core 12 is in a contracted state, and the doctor can insert the urinary catheter structure 1 into the patient's urethra and allow the balloon 13 at the distal end of the inner core 12 to enter the bladder through the patient's urethra. During this operation, the guide end 125 at the distal end of the inner core 12 can provide a guiding effect during insertion, so as to facilitate the doctor's insertion operation.

[0062] After the balloon 13 is placed in the patient's bladder, the doctor can perform gas injection through the gas injection port 123, so that the injected gas enters the balloon 13 through the gas injection passage 121, so that the balloon 13 is Figure 1A The contracted state shown is switched to Figure 1B or Figure 4A or Figure 5A In the expanded state shown, since an air valve (not shown) is also provided in the air injection port 123, it can be ensured that the gas in the balloon 13 will not leak, so that the balloon 13 is maintained in the expanded state and can be positioned in the patient's bladder.

[0063] During use, when the patient needs to urinate involuntarily, the outer sheath 11 can be moved relative to the inner core 12 toward the distal end of the inner core 12, so that the drainage port 113 of the outer sheath 11 is located between the patient's sphincter 22 and the bladder 21 (such as Figure 4A or Figure 5A As shown), in this state, urine in the patient's bladder can directly flow into the drainage port 113 of the outer sheath 11, and be discharged through the urine drainage port 114 via the urine catheter passage 112, thereby providing the patient with an involuntary urination function.

[0064] When the patient needs to urinate autonomously, the outer sheath 11 can be moved relative to the inner core 12 in a direction away from the distal end of the inner core 12, so that the drainage port 113 of the outer sheath 11 is located between the patient's sphincter 22 and the outer opening of the urethra 23 (such as Figure 4B and Figure 5B As shown in FIG. 1 , in this state, urine in the patient's bladder can flow through the sphincter 22 and enter the urethra 23, and then flow into the drainage port 113 of the outer sheath 11, and be discharged through the urinary drainage port 114 via the urinary catheter passage 112, thereby providing the patient with an autonomous urination function. In this state, since the urine in the bladder can flush the patient's urethra (including the sphincter area), the patient's urinary tract irritation symptoms can be relieved.

[0065] In another embodiment of the present application, in view of the problem that traditional urinary catheters are prone to form fluid accumulation in the patient's bladder, the catheter structure 1 of the present application also has a balloon adjustment unit 14, which can be set on the inner core 12 or on the balloon 13, and is used to adjust the expansion shape of the balloon 13 when it is in an inflated state.

[0066] Specifically, the balloon 13 of the present application also includes a first end 131 close to the distal end of the inner core 12 and a second end 132 away from the distal end of the inner core 12, wherein the drainage port 113 on the outer sheath 11 is arranged at a position close to the second end 132 of the balloon 13, and the balloon adjustment unit 14 is used to adjust the expansion shape of the balloon 13 when the balloon 13 is in the expanded state, so as to facilitate the residual urine in the patient's bladder to be diverted from the first end 131 of the balloon 13 to the position of the second end 132 of the balloon 13, and then flow into the drainage port 113 close to the second end 132 of the balloon 13, so as to be discharged from the patient's body through the urinary catheterization passage 112 and the urination port 114.

[0067] In the present application, the balloon adjustment unit 14 can have a variety of different implementation forms.

[0068] In one embodiment, the balloon adjustment unit 14 is used to make the balloon 13 present an irregular symmetrical balloon cross-sectional shape when in the expanded state. FIG. 4A to FIG. 4B In this embodiment, the balloon adjustment unit 14 can be, for example, at least one belt 140 disposed on the outer wall of the inner core 12, wherein the belt 140 is, for example, made of an inelastic or low-elastic material, and the two ends of the belt 140 are respectively fixed to the first end 131 and the second end 132 of the inner core 12 near the balloon 13, so that the balloon 13 can present a shape like Figure 4A and Figure 4B The expanded form of the eccentric balloon shown in FIG. 1 allows the residual urine in the bladder to be discharged from the side of the balloon 13 provided with the belt 140 (i.e. Figure 4A and Figure 4B The liquid flows from the first end 131 of the balloon 13 to the second end 132 of the balloon 13, flows into the drainage port 113 located near the second end 132, and is discharged out of the patient's body through the urinary catheter passage 112 in the outer sheath 11.

[0069] In another embodiment, the balloon adjustment unit 14 can also be used to form a groove on the outer surface of the balloon 13 when the balloon 13 is in an expanded state, and the formed groove can extend from the first end 131 of the balloon 13 to the second end 132 of the balloon 13, so as to guide the residual urine in the bladder from the first end 131 of the balloon 13 to the second end 132 of the balloon 13 through the groove formed on the surface of the balloon 13.

[0070] like Figure 5A and Figure 5E As shown, in this embodiment, the balloon adjustment unit 14 can be, for example, a balloon adjustment device 141 installed at the distal end of the inner core 12, on which at least one adjustment member 142 (such as Figure 5C As shown in the figure, in this embodiment, the number of the adjusting members 142 is, for example, three, but it is not limited thereto, and other numbers of settings are also applicable. The adjusting member 142 is made of an inelastic or low-elastic material, wherein the balloon adjusting device 141 can be sleeved on the distal end of the inner core 12, and the adjusting member 142 is pressed on the outer surface of the balloon 13, and extends from the first end 131 of the balloon 13 to the second end 132 of the balloon 13, so that the balloon 13 is sandwiched between the outer wall of the inner core 12 and the adjusting member 142 of the balloon adjusting device 141, so as to adjust the expansion shape of the balloon 13 when it is in an expanded state.

[0071] In this embodiment, the balloon 13 can be adjusted by the balloon adjustment device 141 to be as follows: Figure 5A and Figure 5E It should be noted that the expansion form of the balloon 13 is not limited to this, and the balloon 13 can also present other different expansion forms, such as a multi-petal balloon, by changing the shape of the adjustment member 142 and / or the number of adjustment members 142. In addition, it should be noted that the expansion form of the above-mentioned three-petal balloon or multi-petal balloon can also be provided on the inner core 12 as follows: Figure 4A and Figure 4B Furthermore, the position of the drainage port 113 on the outer sheath 11 can correspond to the position of the groove on the balloon 13, so that the residual urine guided to the second end 132 of the balloon 13 through the groove can be discharged through the drainage port 113 located at the corresponding position.

[0072] Please continue reading FIG. 6A to FIG. 6CIn another embodiment, the balloon adjustment unit 14 of the present application may also be, for example, a balloon outer sleeve 143, which is made of a non-elastic material or a low-elastic material, and the balloon outer sleeve 143 is provided with a plurality of openings 144 in the circumferential direction (in this embodiment, three openings 144 are provided in the circumferential direction of the balloon outer sleeve 143), and the openings 144 are separated from each other by ribs 145, such as Fig. 6A As shown, the balloon outer sleeve 143 can be sleeved on the outside of the balloon 13. When the balloon 13 is in an expanded state, a portion of its surface can expand and extend out from the opening 144, and grooves are formed on the outer surface of the balloon 13 by means of the ribs 145, thereby achieving the purpose of adjusting the expansion shape of the balloon 13, and allowing the residual urine in the bladder to flow from the first end 131 of the balloon 13 to the second end 132 of the balloon 13 through the formed grooves, and flow into the drainage port 113 located near the second end 132, so as to be discharged from the patient's body through the urine catheterization passage 112 in the outer sheath 11. Compared with other embodiments, the balloon adjustment unit 14 of this embodiment provides better adjustment performance of the balloon expansion shape.

[0073] In summary, the catheter structure provided in the present application has an outer sheath design structure that can move axially relative to the inner core. During use, the relative position of the outer sheath with respect to the inner core can be adjusted so that the drainage port provided on the outer sheath can be selectively located between the patient's sphincter and bladder or between the patient's sphincter and the external urethra, thereby providing the patient with autonomous urination or involuntary urination to meet the different usage requirements of the patient.

[0074] Furthermore, when the catheter structure of the present application is used to provide patients with autonomous urination, since the drainage port of the outer sheath is located between the patient's sphincter and the external urethral opening, the urine in the bladder can pass through the sphincter and enter the urethra and then be discharged through the drainage port of the outer sheath. Compared with the involuntary urination mode, this autonomous urination mode can use the urine in the bladder to flush the secretions produced by the urethral mucosa to relieve the patient's urinary tract irritation symptoms, so it can effectively reduce the incidence of urinary tract infection.

[0075] In addition, the catheter structure of the present application can also adjust the expansion shape of the balloon when it is in an inflated state through the structural design of the balloon adjustment unit, so as to maximize the drainage of urine in the bladder and reduce residual urine in the bladder, thereby further reducing the risk of urinary tract infection.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A urinary catheter structure, used to provide urinary catheterization function for patients, characterized in that: include: An outer sheath tube, which has an inner core passage and a urinary catheter passage inside, and a distal end of the outer sheath tube also has a drainage port connected to the urinary catheter passage; An inner core is inserted into the inner core passage and has a gas injection passage, a distal end of the inner core extends out of the inner core passage and is exposed to the outer sheath tube, and the outer sheath tube can be axially moved relative to the inner core by an external force; A balloon, which is arranged at the distal end of the inner core and is connected to the gas injection passage, and gas is injected through the gas injection passage to make the balloon expand, or gas is exhausted through the gas injection passage to make the balloon contract; wherein the balloon is arranged in the bladder of the patient, wherein when the outer sheath moves relative to the inner core in a direction close to the distal end of the inner core so that the drainage port of the outer sheath is located between the sphincter of the patient and the bladder, urine in the bladder directly flows into the drainage port and is discharged through the urinary catheterization passage, thereby providing the patient with an involuntary urination function; when the outer sheath moves relative to the inner core in a direction away from the distal end of the inner core so that the drainage port of the outer sheath is located between the sphincter of the patient and the external urethral opening, urine in the bladder flows through the sphincter and enters the urethra, and then flows into the drainage port to be discharged through the urinary catheterization passage, thereby providing the patient with an autonomous urination function; The urinary catheter structure further comprises a balloon adjustment unit, which is arranged on the inner core or the balloon and is used to adjust the expansion shape of the balloon when it is in the expanded state; The inner core also has a guide wire passage.

2. The urinary catheter structure according to claim 1, characterized in that: The balloon includes a first end close to the distal end of the inner core and a second end away from the distal end of the inner core. The balloon adjustment unit is used to form a groove on the outer surface of the balloon when the balloon is in the expanded state. The groove extends from the first end of the balloon to the second end of the balloon, so as to guide the residual urine in the bladder from the first end of the balloon to the second end of the balloon through the groove.

3. The urinary catheter structure according to claim 1, characterized in that: The balloon includes a first end close to the distal end of the outer sheath tube and a second end away from the distal end of the outer sheath tube. The balloon adjustment unit is used to make the balloon present an irregularly symmetrical balloon cross-sectional shape when it is in the expanded state, so as to guide the residual urine in the bladder from the first end of the balloon to the second end of the balloon.

4. The urinary catheter structure according to claim 2 or 3, characterized in that: There are multiple drainage ports, and each drainage port is arranged on the outer sheath tube and close to the second end of the balloon, so that the residual urine guided to the second end of the balloon can flow into the drainage port and be discharged through the inner core passage.

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