Foley catheter

Abstract

The present invention provides a Foley catheter which may comprise: a catheter body extending in one direction and having an inflatable balloon coupled to one end thereof; a first flow path passing through the catheter body and having urine flowing therein; a second flow path passing through the catheter body and disposed on one side of the first flow path, and having a liquid medicine flowing therein; and a liquid medicine groove formed in the outer circumferential surface of the catheter body and connected to the second flow path so as to have the liquid medicine flowing therein.

Description

Foley catheter

[0001] The present invention relates to a poly catheter.

[0002] Urine excreted from the kidneys is transported through the ureters to the bladder and then expelled from the body through the urethra. However, if a patient has difficulty urinating voluntarily, a flexible tube, such as a catheter, is inserted through the urethra into the bladder to facilitate drainage.

[0003] Additionally, to prevent bacterial contamination due to catheter insertion or when local anesthesia is required, antibiotics or local anesthetics can be injected externally through the catheter and supplied to the bladder or urethra.

[0004] The purpose of the present invention is to provide a poly catheter capable of smoothly supplying a medicinal liquid into the urethra.

[0005] One aspect of the present invention provides a poly catheter, comprising: a catheter body extending in one direction and having an expansion balloon coupled to one end; a first channel penetrating the catheter body and through which urine flows; a second channel penetrating the catheter body and positioned on one side of the first channel and through which a drug solution flows; and a drug solution groove formed on an outer surface of the catheter body and connected to the second channel and through which the drug solution flows.

[0006] According to one embodiment of the present invention, a poly catheter is configured such that a drug is injected into an internal path, and a drug groove formed on an outer surface is connected to the internal path so that the drug can be effectively distributed into the urethra.

[0007] Figure 1 is a conceptual drawing showing a state of use of a poly catheter according to one embodiment of the present invention.

[0008] Fig. 2 is a perspective view illustrating the poly catheter of Fig. 1.

[0009] Figure 3 is a drawing showing a modified example of the poly catheter of Figure 2.

[0010] Figure 4 is a drawing showing an enlarged cross-section of a portion of the poly catheter of Figure 2.

[0011] Figure 5 is an enlarged view of one end of the poly catheter of Figure 2.

[0012] Figure 6 is a drawing showing the fluid flowing in the poly catheter of Figure 2.

[0013] FIG. 7 is a drawing showing a flow path provided by a poly catheter according to another embodiment of the present invention.

[0014] Figure 8 is an enlarged view of the cross-section of the poly catheter shown in Figure 4.

[0015] Figure 9 is a drawing showing another embodiment of a drug solution groove provided in the poly catheter of the present invention.

[0016] One aspect of the present invention provides a poly catheter, comprising: a catheter body extending in one direction and having an expansion balloon coupled to one end; a first channel penetrating the catheter body and through which urine flows; a second channel penetrating the catheter body and positioned on one side of the first channel and through which a drug solution flows; and a drug solution groove formed on an outer surface of the catheter body and connected to the second channel and through which the drug solution flows.

[0017] Additionally, the above-mentioned liquid groove may extend spirally toward the above-mentioned end of the catheter body.

[0018] Additionally, the above-mentioned liquid groove may be arranged in a liquid distribution section adjacent to the above-mentioned expansion balloon.

[0019] Additionally, the above-mentioned liquid groove may be formed concavely in the catheter body and have an inclined side wall.

[0020] In addition, the second euro may further include a liquid outlet extending from the second euro and connected to the liquid groove, through which the liquid flows out.

[0021] Additionally, the diameter of the liquid outlet may be 0.03 to 0.3 times the diameter of the second flow path.

[0022] Additionally, the catheter body may further include a third passage through which air flows, the third passage being positioned on the other side of the first passage.

[0023] Additionally, the first euro may have a first curved portion that is curved toward the center of the catheter body, and a second curved portion that is curved toward the edge of the catheter body.

[0024] The configuration and operation of the present invention will be described in detail with reference to embodiments of the present invention illustrated in the attached drawings below.

[0025] The present invention is capable of various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, as well as the methods for achieving them, will become clearer with reference to the embodiments described in detail below, along with the drawings. However, the present invention is not limited to the embodiments disclosed below and can be implemented in various forms.

[0026] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals and redundant descriptions thereof will be omitted.

[0027] In the examples below, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0028] In the examples below, terms such as “include” or “have” mean that a feature or component described in the specification is present, and do not preclude the possibility that one or more other features or components may be added.

[0029] In some embodiments, where implementations are otherwise feasible, specific process sequences may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the described order.

[0030] For convenience of explanation, the sizes of components in the drawings may be exaggerated or reduced. For example, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the following embodiments are not necessarily limited to those shown.

[0031] In the drawing of the present invention, the first direction (DR1) of the three-axis coordinate system corresponds to the longitudinal direction in which the poly catheter extends, and the second direction (DR2) and the third direction (DR3) intersecting the second direction (DR2) may correspond to the radial direction of the poly catheter orthogonal to the first direction (DR1).

[0032] Fig. 1 is a conceptual diagram illustrating a state of use of a poly catheter (10) according to one embodiment of the present invention. Fig. 2 is a perspective view illustrating the poly catheter (10) of Fig. 1 as an example, and Fig. 3 is a diagram illustrating a modified example of the poly catheter (10) of Fig. 2.

[0033] Referring to FIGS. 1 to 3, a poly catheter (10) can be inserted into the bladder (BD) and urethra (UR). Urine (UL), medication (ML), and air (AG) can flow through the poly catheter (10).

[0034] In detail, urine (UL) can be discharged outside the patient's body through the poly catheter (10). In addition, a drug solution (ML) can be injected into the patient's bladder (BD) and / or urethra (UR) through the poly catheter (10). At this time, the drug solution (ML) can be any type of substance that can be injected into the patient's body, such as a local anesthetic, a bladder (BD) cleanser, etc. In addition, air (AG) can be introduced through the poly catheter (10) to inflate and secure the inflation balloon (200) inside the bladder (BD).

[0035] A poly catheter (10) may be provided with a catheter body (100) and an inflation balloon (200).

[0036] The catheter body (100) may be provided in a tube shape by extending in one direction. The catheter body (100) may extend in a first direction (DR1) and may have a hollow interior.

[0037] The catheter body (100) may be made of a flexible material. For example, the catheter body (100) may include silicone. The catheter body (100) is provided with flexibility, so that it can be smoothly inserted into the body.

[0038] The catheter body (100) may have one or more hollow spaces (not shown) within it. For example, the catheter body (100) may have three hollow spaces, through which urine (UL), a drug solution (ML), and air (AG) may flow. The three hollow spaces provided in the catheter body (100) may be defined as the first to third flow paths, respectively, as described below.

[0039] Urine (UL) can be discharged from the patient's body through the catheter body (100). Furthermore, a drug solution (ML) can be injected through the catheter body (100) and delivered to the patient's bladder and urethra. Furthermore, air (AG) can be introduced through the catheter body (100) to inflate and secure the inflation balloon (200) within the bladder (BD).

[0040] The catheter body (100) may have a drug dispersing portion (110). The drug dispersing portion (110) is defined as an area in which a drug (ML) can be dispersed externally from the catheter body (100). A drug groove (MG) for drug dispersing may be arranged in the drug dispersing portion (110).

[0041] The drug dispersing unit (110) can be positioned adjacent to the expansion balloon (200). The drug dispersing unit (110) is positioned relatively adjacent to one end (101) of the catheter body (100), so that when the poly catheter (10) is inserted into the patient's body, the drug dispersing unit (110) can be positioned inside the urethra (UR).

[0042] In one embodiment, the length of the drug dispersing portion (110) may be selected in consideration of the length of the urethra (UR). For example, the length of the drug dispersing portion (110) may be formed to be shorter than the length of the urethra (UR), so that the drug can be efficiently dispersed within the urethra (UR).

[0043] The drug dispersing portion (110) is positioned adjacent to one end (101) of the catheter body (100), and may be formed relatively long, as in FIG. 2. Alternatively, as in FIG. 3, the poly catheter (10A) may have a relatively short drug dispersing portion (110A).

[0044] The length of a patient's urethra (UR) varies, and especially considering the anatomy of men and women, the length of a woman's urethra (UR) is generally shorter than that of a man's. Therefore, in the embodiment in which the length of the drug dispersing portion (110A) is relatively short, as shown in FIG. 3, the poly catheter (10A) can be effectively used in female patients with relatively short urethra (UR).

[0045] In this way, the catheter body (100) is provided with a drug dispersing section (110) considering the length of the urethra (UR), so that the drug (ML) can be stably and economically distributed into the patient's urethra (UR).

[0046] An inflation balloon (200) may be placed at one end of the catheter body (100). The inflation balloon (200) may be placed a predetermined distance from one end (101) of the catheter body (100). When the poly catheter (10) is inserted into the patient's body, the inflation balloon (200) may be placed inside the bladder (BD).

[0047] The poly catheter (10) may further include a urination port (300), a drug injection port (400), and an air injection port (500).

[0048] The urinary port (300) can provide a passage for draining urine (UL) from the patient's bladder (BD).

[0049] The drug injection port (400) can provide a passage for injecting a drug (ML) such as a local anesthetic, bladder (BD) cleanser, etc. into the bladder (BD) and / or urethra (UR). The drug injection port (400) can be connected to a drug supply unit (not shown) to receive the drug (ML).

[0050] For example, although not shown in the drawing, the drug injection port (400) can receive the drug (ML) from the drug (ML) supply tank. In addition, the drug (ML) can be injected into the interior of the poly catheter (10) at a preset flow rate under pressure from the drug supply pump.

[0051] The air injection port (500) may provide a passage through which air (AG) is introduced to inflate the inflation balloon (200). The air injection port (500) may be connected to an air supply unit (not shown) to receive air (AG). For example, the air injection port (500) may be connected to an air pump of the air supply unit to receive air (AG) at a predetermined pressure.

[0052] The urination port (300), the liquid injection port (400), and the air injection port (500) are connected to the other end of the catheter body (100) and can provide a connection passage through which fluid flows into or out of the catheter body (100).

[0053] FIGS. 2 and 3 illustrate an embodiment in which a urination port (300), a liquid injection port (400), and an air injection port (500) are each provided, but the present invention is not limited thereto, and each port may be provided in multiple numbers depending on the number of hollow ports provided in the catheter body (100), etc.

[0054] Fig. 4 is a drawing showing an enlarged portion of a section of the poly catheter (10) of Fig. 2, and Fig. 5 is a drawing showing an enlarged portion of one end of the poly catheter (10) of Fig. 2. In addition, Fig. 6 is a drawing showing a fluid flowing in the poly catheter (10) of Fig. 2.

[0055] Referring to FIGS. 4 to 6, the poly catheter (10) may have a first flow path (FP1), a second flow path (FP2), and a third flow path (FP3).

[0056] The first flow path (FP1) penetrates the catheter body (100) and allows urine (UL) to flow. Urine (UL) can be discharged outside the patient's body through the first flow path (FP1).

[0057] The first flow path (FP1) may be connected to the first opening (FH1) of the catheter body (100). In addition, the first flow path (FP1) may be connected to a third opening (FH3) in the catheter body (100) that is open in a different direction from the first opening (FH1). That is, urine (UL) flows into the first flow path (FP1) from two or more directions at one end (101) of the catheter body (100), thereby allowing urine inside the bladder (BD) to be discharged quickly and effectively.

[0058] The first flow path (FP1) may be positioned at the center of the catheter body (100). As shown in FIG. 4, the first flow path (FP1) may penetrate the center of the catheter body (100) and may have a relatively large cross-sectional area compared to the second flow path (FP2) and the third flow path (FP3). This allows the poly catheter (10) to discharge a relatively large amount of urine (UL) to the outside.

[0059] The second flow path (FP2) penetrates the catheter body (100) and allows the drug solution (ML) to flow. The drug solution (ML) can be injected into the patient's body through the second flow path (FP2).

[0060] In one embodiment, the second flow path (FP2) may be connected to the second opening (FH2) of the catheter body (100). The drug solution (ML) may flow along the second flow path (FP2) and flow out into the bladder (BD) through the second opening (FH2) of one end (101) of the catheter body (100). Also, although not shown in the drawing, similar to the first flow path (FP1), the second flow path (FP2) may be connected to a separate opening that opens in a different direction from the second opening (FH2).

[0061] In another embodiment, unlike FIG. 5, the second flow path (FP2) may be provided in a form that extends in the first direction (DR1) but has a closed end. That is, the catheter body (100) may only have a first opening (FH1) and / or a third opening (FH3) through which urine (UL) flows at one end (101). In this case, the drug (ML) flowing through the second flow path (FP2) can only flow out to the urethra (UR).

[0062] The second flow path (FP2) may be positioned on one side of the first flow path (FP1). When the first flow path (FP1) is positioned in the center of the catheter body (100) as in Fig. 4, the second flow path (FP2) may penetrate the catheter body (100) from one side of the first flow path (FP1).

[0063] That is, the second flow path (FP2) can be placed relatively at the edge region on the cross-section of the catheter body (100). As a result, the drug solution (ML) can be quickly dispersed outside the catheter body (100) as the drug solution groove (MG) described later is relatively short connected to the second flow path (FP2).

[0064] The third flow path (FP3) penetrates the catheter body (100) and allows air (AG) to flow. Air (AG) is injected into the inflation balloon (200) through the third flow path (FP3), allowing the inflation balloon (200) to expand.

[0065] The third flow path (FP3) may be positioned on the other side of the first flow path (FP1). As shown in FIG. 4, when the first flow path (FP1) is positioned in the center of the catheter body (100), the third flow path (FP3) may penetrate the catheter body (100) from the other side of the first flow path (FP1). That is, the first flow path (FP1) may be positioned between the second flow path (FP2) and the third flow path (FP3). In addition, the third flow path (FP3) may be positioned relatively in the edge region on the cross-section of the catheter body (100).

[0066] In other words, a first flow path (FP1) having a relatively large cross-sectional area may be placed in the center of the catheter body (100), and a second flow path (FP2) and a third flow path (FP3) may be placed on one side and the other side of the first flow path (FP1), respectively. Through this, three flow paths may be efficiently placed in a catheter body (100) having a small cross-sectional area.

[0067] The arrangement, number, cross-sectional shape, cross-sectional area, etc. of the first flow path (FP1) to the third flow path (FP3) of the poly catheter (10) can be selected in various ways.

[0068] Since the catheter body (100) has a small cross-sectional area for insertion into the urethra (UR), the arrangement, shape, etc. of the first flow path (FP1) to the third flow path (FP3) provided within the catheter body (100) can be selected with this in mind. In addition, the arrangement, shape, etc. of the first flow path (FP1) to the third flow path (FP3) can be determined depending on the amount, speed, etc. of the fluid flowing through the poly catheter (10).

[0069] FIG. 7 is a drawing showing a flow path provided by a poly catheter (10') according to another embodiment of the present invention.

[0070] Referring to Fig. 7, the poly catheter (10') may be provided with two third flow paths (FP3'). Also, although not shown in the drawing, a first flow path (FP1') and a second flow path (FP2') may be provided in multiple numbers, depending on the flow rate and speed of urine (UL) and drug solution (ML), respectively.

[0071] Also, Fig. 7 shows an embodiment in which the first flow path (FP1') has a rectangular cross-section and the second flow path (FP2') is arranged on one side of the first flow path (FP1') but has a roughly elliptical cross-section.

[0072] Meanwhile, for convenience of explanation, the following description focuses on an embodiment in which the first euro (FP1) to the third euro (FP3) are provided in the arrangement and form shown in Fig. 4.

[0073] Referring again to FIG. 4, the poly catheter (10) may further include a drug solution groove (MG) and a drug solution outlet (MH).

[0074] The liquid groove (MG) may be arranged on the outer surface of the catheter body (100). The liquid groove (MG) is formed in a concave groove shape on the outer surface of the catheter body (100), thereby providing a path for the fluid to flow.

[0075] The liquid medicine groove (MG) is connected to the second flow path (FP2) so that the liquid medicine (ML) can flow. The liquid medicine groove (MG) is connected to the second flow path (FP2) through the liquid medicine outlet (MH), and the liquid medicine (ML) flowing within the second flow path (FP2) can flow out into the liquid medicine groove (MG) through the liquid medicine outlet (MH). Therefore, the liquid medicine groove (MG) can function as a separate flow path through which the liquid medicine (ML) flows on the surface of the catheter body (100).

[0076] The drug solution groove (MG) may be positioned in the drug solution dispersing portion (110) of the catheter body (100). As described above, the drug solution dispersing portion (110) of the catheter body (100) may be inserted into the urethra (UR) connected to the bladder (BD) adjacent to the inflation balloon (200). The drug solution groove (MG) is formed in the drug solution dispersing portion (110) of the catheter body (100), so that the drug solution (ML) flowing along the drug solution groove (MG) may be dispersed within the urethra (UR).

[0077] The liquid groove (MG) may extend in a spiral shape from the outer surface of the catheter body (100). The liquid groove (MG) may be formed in a spiral shape and may be provided as a single flow path extending from the catheter body (100) toward the expansion balloon (200). Through this, the liquid (ML) may flow from the liquid groove (MG) toward the expansion balloon (200) and be distributed within the urethra (UR).

[0078] The liquid outlet (MH) extends from the second flow path (FP2) and is connected to the liquid groove (MG), through which the liquid (ML) can flow. The liquid outlet (MH) is formed as a hole connecting the second flow path (FP2) and the liquid groove (MG), through which the liquid (ML) can flow. In particular, when the liquid (ML) flows at a predetermined flow rate in the second flow path (FP2), the liquid (ML) can flow out through the liquid outlet (MH) due to pressure.

[0079] In one embodiment, the poly catheter (10) may be provided with a plurality of drug outlets (MH). The plurality of drug outlets (MH) are spaced apart from each other so that the drug (ML) can be evenly distributed throughout the entire area of ​​the urethra (UR).

[0080] For example, multiple drug outlets (MH) may be spaced apart along an imaginary straight line. Alternatively, multiple drug outlets (MH) may be spaced apart along an imaginary spiral. Furthermore, the spacing (HL) between adjacent drug outlets (MH) may be constant or different.

[0081] That is, the arrangement of the liquid outlet (MH) can be varied depending on the purpose of injection of the liquid (ML), the target area for distribution, etc.

[0082] In one embodiment, the drug outlet (MH) may be positioned so as to form a predetermined angle with respect to the flow direction of the drug (ML) within the second flow path (FP2). For example, as shown in FIG. 6, when the drug (ML) moves in the first direction (DR1) within the second flow path (FP2), the drug outlet (MH) may be formed to extend in a third direction (DR3) perpendicular to the first direction (DR1). This allows the drug (ML) to effectively flow out to the outer surface of the catheter body (100).

[0083] Hereinafter, the specific shapes, sizes, etc. of the first flow path (FP1) to the third flow path (FP3), the drug groove (MG) and the drug outlet (MH) of the poly catheter (10) of the present invention, and the distribution principle of the drug (ML) according to these, will be described in detail.

[0084] Figure 8 is an enlarged view of the cross-section of the poly catheter (10) shown in Figure 4.

[0085] Referring to FIG. 8, the first euro (FP1) may have a first bend (IC) and a second bend (OC).

[0086] The first bend (IC) is defined as an area that is bent inward from the first flow path (FP1), i.e., toward the center of the catheter body (100). The first flow path (FP1) may have a pair of first bends (IC), and the first bends (IC) may be bent inward between the second flow path (FP2) and the third flow path (FP3).

[0087] In one embodiment, the radius of curvature of the first bend (IC) may be substantially equal to or greater than the radius of curvature of the second flow path (FP2). Similarly, the radius of curvature of the first bend (IC) may be substantially equal to or greater than the radius of curvature of the third flow path (FP3). Furthermore, the first bend (IC) may have a constant radius of curvature, or the radius of curvature may vary.

[0088] The second bend (OC) is defined as an area that curves outward from the first flow path (FP1), i.e., toward the edge of the catheter body (100). The first flow path (FP1) may have a pair of second bends (OC) connecting a pair of first bends (IC).

[0089] In one embodiment, the curvature of the second bend (OC) may be substantially equal to or greater than the radius of curvature of the catheter body (100). Additionally, the second bend (OC) may have a constant radius of curvature or may have a variable radius of curvature.

[0090] As described above, the first flow path (FP1) is arranged between the second flow path (FP2) and the third flow path (FP3), and urine (UL) can flow. The amount of urine (UL) flowing through the poly catheter (10) of the present invention may be relatively large compared to the amount of liquid (ML) or air (AG). Therefore, the first flow path (FP1) can be provided in an optimal shape that can be efficiently arranged together with the second flow path (FP2) and the third flow path (FP3) in a small-sized catheter body (100) while effectively urinating a large amount of urine (UL).

[0091] The liquid groove (MG) may have a groove surface (GW) and a side wall portion (SW). The groove surface (GW) may be defined as the bottom surface of the liquid groove (MG) that is concave on the outer surface of the catheter body (100). In addition, the side wall portion (SW) may be defined as the side surface of the groove surface (GW) and the area connecting the groove surface (GW) and the outer surface of the catheter body (100).

[0092] In one embodiment, the side wall portion (SW) may be formed to be inclined. The liquid groove (MG) has a side wall portion (SW) having a predetermined inclination angle (GA), so that the liquid (ML) can effectively flow out to the outside.

[0093] In one embodiment, the inclination angle (GA) of the side wall portion (SW) may be less than 90 degrees.

[0094] When the side wall (SW) is formed perpendicular to the groove surface (GW) and the outer surface, the drug (ML) may not be smoothly distributed to the outside of the drug groove (MG). In addition, when the boundary between the side wall (SW) and the outer surface is defined as the boundary (BA), the boundary (BA) may be formed sharply, which may damage the urethra (UR).

[0095] Meanwhile, the poly catheter (10) of the present invention has a side wall (SW) with an inclination angle (GA) of 90 degrees or less, thereby preventing damage to the urethra (UR) and allowing the drug solution (ML) to be effectively distributed.

[0096] Figure 9 is a drawing showing another embodiment of a liquid groove (MG) provided in a poly catheter (10) of the present invention.

[0097] Referring to Fig. 9, the liquid groove (MG) may have a depression (DP). The depression (DP) may be formed by a portion of the groove surface (GW) of the liquid groove (MG) being depressed.

[0098] The poly catheter (10) has a depression (DP) in the drug solution groove (MG), so that the speed and amount of drug solution (ML) dispersion within the urethra (UR) can be controlled. Fig. 9 shows an example in which a depression (DP) is formed in the area where the groove surface (GW) and the side wall portion (SW) are connected.

[0099] In one embodiment, the depression (DP) may have a curvature. As shown in FIG. 9, the depression (DP) is formed as a curved surface, so that the drug (ML) can be smoothly distributed to the outside of the drug groove (MG).

[0100] In one embodiment, the depression depth (DH) of the depression (DP) may be within 1.3 times the depth (GH) of the groove surface (GW). If the depression depth (DH) of the depression (DP) is excessively large, some of the drug (ML) that is required to be dispersed within the urethra (UR) may not be dispersed and may remain in the depression (DP). Therefore, the depression depth (DH) of the depression (DP) is selected within a predetermined range depending on the physical properties of the drug (ML), particularly the density, viscosity, etc., so that the degree of dispersion of the drug (ML) can be effectively controlled.

[0101] The liquid outlet (MH) can connect the second flow path (FP2) and the liquid groove (MG). The liquid outlet (MH) extends from the second flow path (FP2) and can have various cross-sectional shapes. For example, the liquid outlet (MH) can have a circular cross-section.

[0102] The size of the liquid outlet (MH) can be determined within a range in which the liquid (ML) can flow out through the liquid outlet (MH).

[0103] In one embodiment, the diameter (HD) of the liquid outlet (MH) can be determined by at least one of the extended length (HH) of the liquid outlet (MH), the supply pressure of the liquid (ML), and the cross-sectional area of ​​the second flow path (FP2).

[0104] The drug solution outlet (MH) can function as a path for discharging the drug solution (ML) to the outside of the catheter body (100). Whether the drug solution (ML) flows out of the drug solution outlet (MH) can vary depending on the balance of forces applied to the drug solution (ML) flowing into the drug solution outlet (MH).

[0105] In detail, when the chemical liquid (ML) flows into the chemical liquid outlet (MH), if the force pushing the chemical liquid (ML) from the second flow path (FP2) to the chemical liquid outlet (MH) is greater than the surface tension of the chemical liquid (ML) at the chemical liquid outlet (MH), the chemical liquid (ML) can flow out of the chemical liquid outlet (MH).

[0106] In a natural state where the drug (ML) does not flow in the second flow path (FP2), the force pushing the drug (ML) out of the drug outlet (MH) from the second flow path (FP2) and the drug outlet (MH) may be equal to the sum of the pressure (e.g., hydrostatic pressure) of the drug (ML) inside the drug outlet (MH), the surface tension of the drug (ML) at the drug outlet (MH), and the external pressure (e.g., atmospheric pressure).

[0107] At this time, the pressure of the chemical liquid (ML) can be determined according to the extension length (HH) of the chemical liquid outlet (MH). In addition, the surface tension of the chemical liquid (ML) at the chemical liquid outlet (MH) can be determined according to the diameter (HD) of the chemical liquid outlet (MH).

[0108] Therefore, whether or not the drug solution (ML) flows out in a natural state can be determined by the diameter (HD) and extension length (HH) of the drug solution outlet (MH). Additionally, whether or not the drug solution (ML) flows out can also be determined by the density, viscosity, friction, etc. of the drug solution (ML).

[0109] Meanwhile, as described above, when the chemical liquid (ML) flows through the second flow path (FP2) at a predetermined flow rate by the chemical liquid supply pump (not shown), the force pushing the chemical liquid (ML) from the second flow path (FP2) to the chemical liquid outlet (MH) may vary based on the natural state. The flow rate of the chemical liquid (ML) may be determined by the supply pressure applied to the chemical liquid (ML) by the chemical liquid supply pump, the cross-sectional area of ​​the second flow path (FP2), etc.

[0110] In summary, whether or not the drug solution (ML) flows out can vary depending on the diameter (HD) of the drug solution outlet (MH), the extended length (HH) of the drug solution outlet (MH), the supply pressure of the drug solution (ML), the cross-sectional area of ​​the second flow path (FP2), etc. Accordingly, the diameter (HD) of the drug solution outlet (MH) of the poly catheter (10) of the present invention can be determined by comprehensively considering the extended length (HH) of the drug solution outlet (MH), the supply pressure of the drug solution (ML), the cross-sectional shape of the second flow path (FP2), the cross-sectional area, etc.

[0111] In one embodiment, the diameter (HD) of the liquid outlet (MH) may have a predetermined ratio to the diameter of the second flow path (FP2).

[0112] In detail, when the drug outlet (MH) connects the second flow path (FP2) and the drug groove (MG), the extension length (HH) can be determined as a fixed value. At this time, within the normal supply pressure range of the drug (ML) injected through the poly catheter (10), the diameter (HD) of the drug outlet (MH) can be selected to vary within a predetermined range depending on the cross-sectional area of ​​the second flow path (FP2).

[0113] For example, if the second flow path (FP2) has a circular cross-section with a diameter of 1 mm, the diameter (HD) of the liquid outlet (MH) may be 0.03 mm to 0.3 mm. On the other hand, if the cross-section of the second flow path (FP2) is not circular but polygonal, the diameter (HD) of the liquid outlet (MH) may be 0.03 to 0.3 times the effective diameter of the second flow path (FP2).

[0114] In this way, the poly catheter (10) can be provided with the first flow path (FP1) to the third flow path (FP3) in a shape, arrangement, and size that can smoothly discharge urine (UL) and inject a medicinal solution (ML). In addition, the depth (GH) and shape of the medicinal solution groove (MG), the diameter (HD) of the medicinal solution outlet (MH), etc. can be determined within an optimal range that allows the medicinal solution (ML) to be effectively distributed to the outside of the catheter body (100).

[0115] According to one embodiment of the present invention, a poly catheter has a concave groove formed on the outer surface of the drug solution, which is connected to an internal flow path for the drug solution and a drug solution outlet, so that the drug solution can be effectively distributed into the urethra along the drug solution groove. According to one embodiment of the present invention, the poly catheter has a slanted side wall portion of the drug solution groove, so that damage during urethral insertion can be minimized. In addition, according to one embodiment of the present invention, a drug solution outlet having a predetermined size range can be provided, so that the drug solution can be effectively distributed into the urethra.

[0116] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

[0117] The specific implementations described in the examples are exemplary and do not limit the scope of the examples in any way. Furthermore, unless specifically stated as "essential," "important," or the like, an element may not be absolutely necessary for the application of the present invention.

[0118] The use of the term "above" and similar referential terms in the specification of embodiments (especially the claims) may refer to both singular and plural. Furthermore, if a range is described in the embodiments, it is intended that the invention includes individual values ​​within the range (unless otherwise stated), and is equivalent to describing each individual value constituting the range in the detailed description. Finally, unless the order of steps constituting a method according to an embodiment is explicitly stated or otherwise stated to the contrary, the steps may be performed in any suitable order. The embodiments are not necessarily limited by the order in which the steps are described. The use of all examples or exemplary terms (e.g., "etc.") in the embodiments is merely intended to describe the embodiments in detail, and the scope of the embodiments is not limited by the examples or exemplary terms, unless otherwise defined by the claims. Furthermore, those skilled in the art will recognize that various modifications, combinations, and variations may be made within the scope of the appended claims or their equivalents, depending on design conditions and factors.

Claims

1. A catheter body extending in one direction and having an expansion balloon attached to one end; A first channel penetrating the catheter body and through which urine flows; A second channel penetrating the catheter body and positioned on one side of the first channel, through which the drug liquid flows; and A poly catheter, comprising a liquid groove formed on the outer surface of the catheter body and connected to the second flow path through which the liquid flows.

2. In paragraph 1, A poly catheter, wherein the above-mentioned liquid groove extends spirally toward the above-mentioned one end of the catheter body.

3. In paragraph 1, A poly catheter, wherein the above-mentioned liquid groove is arranged in a liquid distribution section adjacent to the above-mentioned inflation balloon.

4. In paragraph 1, A poly catheter, wherein the above-mentioned liquid groove is formed concavely in the catheter body and has an inclined side wall.

5. In paragraph 1, A poly catheter further comprising a liquid outlet extending from the second euro and connected to the liquid groove, through which the liquid flows out.

6. In paragraph 5, A poly catheter, wherein the diameter of the above-mentioned liquid outlet is 0.03 to 0.3 times the diameter of the second flow path.

7. In paragraph 1, A poly catheter further comprising a third channel penetrating the catheter body and positioned on the other side of the first channel, through which air flows.

8. In paragraph 1, The above first euro is, a first bend portion that is curved toward the center of the catheter body; and A poly catheter, comprising a second bent portion that is curved toward the edge of the catheter body.

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