Comfortable catheter and processing method of catheter

Abstract

The invention provides a comfortable urethral catheter and a urethral catheter processing method.The urethral catheter comprises a urethral catheter body with a guiding head at the front end, the urethral catheter body comprises an inner wall, an outer wall annularly arranged outside the inner wall and an adjusting layer arranged between the inner wall and the outer wall, and the inner wall and the outer wall are both made of flexible deformable materials; a plurality of supporting strips extending in the length direction of the catheter body and a plurality of strip-shaped cavities are arranged in the adjusting layer, and the supporting strips and the cavities are arranged in a staggered mode in the circumferential direction. By inflating / deflating the cavity, the catheter body can expand / contract to become thicker / thinner. The adjusting layer is arranged between the inner wall and the outer wall of the urethral catheter body, so that the thickness of the urethral catheter body can be adjusted, the urethral catheter body is thin when being placed, the urethral catheter body can smoothly penetrate through a narrow urethra or a urethra with protrusions on the inner wall, the urethral catheter body expands in situ after being placed, shearing force is not generated on the protrusions on the urethral wall, static extrusion is generated, and the urethral catheter body is not damaged. The damage to the urethra of a patient is smaller, and the comfort is improved.

Description

Technical Field

[0001] The invention belongs to the field of medical technology, and in particular relates to a comfortable urinary catheter and a processing method of the urinary catheter. Background Art

[0002] As a common medical device in clinical practice, a urinary catheter is inserted into the human body through the urethra to drain urine from the bladder to the outside of the body. Its main function is to accurately record urine volume, facilitate drainage and flushing, etc., and plays an important role in clinical practice. Conventional urinary catheters are mainly made of silicone, rubber, EVA, PVC, etc. The head and the tube are relatively soft. When the top of the catheter head moves to the narrow part of the urethra, it needs to increase external force to push it forward, which brings great pain to the patient, causes damage to the urethral mucosa, and increases the risk of urinary tract infection.

[0003] Based on this, CN201710345800.0 discloses a narrow expansion type urinary catheter, in which a nipple-shaped flexible and hollow thin segment is connected to the outer surface of the top of the catheter head. During the insertion process, the expandable part of the head thin segment can be filled in a targeted manner, and the uniform coating of the lubricating substance can be used to minimize the risk of damage and infection while improving the success rate of insertion. When it is inserted, the thin segment is expanded to expand the narrow urethra. For patients with protrusions on the urethral wall (such as urethral polyps and urethral caruncle), during the insertion process, the outer wall of the catheter will squeeze the expanded urethra, increase the damage to the protrusions on the urethral wall, and during the insertion process, the catheter will also generate shear force acting on the urethral wall protrusions when inserted, dynamically squeezing the urethral wall protrusions, and causing greater damage to the patient's urethra. Therefore, it is necessary to design a more suitable patient with protrusions on the urethral wall. Summary of the invention

[0004] The present invention aims to solve the technical problems existing in the prior art. The first object of the present invention is to provide a comfortable urinary catheter. The second object of the present invention is to provide a processing method of the above-mentioned urinary catheter.

[0005] To achieve the first object, the present invention adopts the following technical scheme: a comfortable urinary catheter, comprising a hollow urinary catheter body, the front end of the urinary catheter body is a guide head for entering the bladder, the hollow part of the urinary catheter body is a urinary catheter cavity, the front part of the urinary catheter body is provided with a urine inlet communicating with the urinary catheter cavity, the tail part of the urinary catheter body located outside the body is provided with a urine outlet communicating with the urinary catheter cavity; the urinary catheter body comprises an inner wall, an outer wall arranged outside the inner wall, and an adjustment layer arranged between the inner wall and the outer wall, the inner wall and the outer wall are both made of flexible and deformable materials, and the adjustment layer is provided with a plurality of Support strips extending in the length direction and a plurality of strip-shaped cavities, the plurality of support strips and the plurality of cavities are circumferentially staggered; the inner surface of the support strip is fixedly connected to the inner wall, the outer surface of the support strip is fixedly connected to the outer wall, and there is a cavity between the support strips; by discharging the gas in the cavity to shrink the cavity, two adjacent support strips can approach each other, and the inner diameter and outer diameter of the catheter body are reduced, so that the catheter body is in a contracted state; by inflating the cavity to expand the cavity, two adjacent support strips can move away from each other, and the inner diameter and outer diameter of the catheter body are increased, so that the catheter body is in an expanded state.

[0006] In the above technical solution, an adjustment layer is arranged between the inner wall and the outer wall of the catheter body, and the support strips in the adjustment layer play a supporting role, so that the catheter body has a certain hardness and is not soft, and can be inserted under external force. By filling and releasing air into the cavity in the adjustment layer, the thickness of the catheter body can be adjusted. When catheterizing, it is thick, which does not affect the catheterization function, and when inserted, it is thin, which is conducive to smoothly passing through the patient's urethra, and is more comfortable, especially for patients with narrow urethra or urethral wall protrusions. For patients with urethral wall protrusions, after insertion, the catheter body is expanded in situ, and no shear force will be generated on the urethral wall protrusions, and only radial squeezing force will be generated on the urethral wall protrusions, which is static squeezing. Compared with the dynamic squeezing that generates shear force in the prior art, the catheter body of the present invention causes less damage to the patient's urethra; in addition, because the catheter body of the present invention is provided with a cavity, the catheter body has a certain buffering function, further reducing the damage to the urethral wall protrusions and improving comfort.

[0007] In a preferred embodiment of the present invention, a bladder fixing balloon is provided on the catheter body and is located at the rear side of the urine inlet; by exhausting the gas in the bladder fixing balloon to shrink it, the bladder fixing balloon can extend into the bladder along with the movement of the catheter body; by inflating the bladder fixing balloon to expand it, the bladder fixing balloon can be stuck in the bladder to fix the catheter body.

[0008] The above technical solution fixes the urinary catheter body by arranging a bladder fixing bag, and the structure is simple and reliable.

[0009] In a preferred embodiment of the present invention, the bladder fixation balloon is in communication with one of the cavities.

[0010] In the above technical solution, the bladder fixing bag body is communicated with one of the cavities, so there is no need to separately set up an inflation and deflation channel to inflate and deflate the bladder fixing bag body, and the structure is simpler.

[0011] In a preferred embodiment of the present invention, the support bar is an arc-shaped bar with an arc-shaped cross section, and the front end of the support bar has an arc-shaped segment extending forward and inward.

[0012] In the above technical solution, the arrangement of the arc strip makes the outer surface of the catheter body in the contracted state close to a circle, reducing damage to the urethral wall; by arranging the arc segment, the guide head in the contracted state is hemispherical, which is conducive to smooth entry into the urethra.

[0013] In a preferred embodiment of the present invention, the front ends of all the support bars are movably connected, and when the catheter body switches between the contracted and expanded states, the inner surfaces of the arc-shaped segments of the front ends of the support bars can approach and move away from each other; or the front ends of all the support bars are fixedly connected, and openings are provided on the outer walls of the front parts of all the support bars, and when the catheter body switches between the contracted and expanded states, the front parts of the support bars can be bent through the openings.

[0014] The above technical solution provides two ways of connecting the front ends of the support strips. When the front ends of the support strips are fixedly connected, the strength of the catheter body is higher and the shape of the catheter body can be better maintained.

[0015] In another preferred embodiment of the present invention, the inner wall and the outer wall are both made of soft silicone layer or soft plastic layer; and / or the support bar is made of silicone, rubber, EVA or PV with a certain hardness.

[0016] In another preferred embodiment of the present invention, all cavities can work simultaneously to be inflated and deflated simultaneously, or each cavity can work independently to be inflated and deflated independently, and the tail part of the outer wall located outside the body has a plurality of external connecting ports which correspond to and communicate with the plurality of cavities one by one; when all cavities work simultaneously, a joint sac body is fixedly connected to the outside of the outer wall and an annular joint sac body is arranged outside the outer wall, and all external connecting ports are communicated with the interior of the joint sac body, and the joint sac body has a total ventilation interface which is communicated with the interior thereof, and the inflation and deflation device is connected to the total ventilation interface through an air pipe; when each cavity works independently, a ventilation branch interface is provided at each external connecting port, and the inflation and deflation device is respectively connected to the plurality of ventilation branch interfaces through a plurality of air pipes arranged in parallel.

[0017] The above technical solution provides a specific implementation method for making all the cavities of the catheter body work simultaneously or independently. All the cavities work simultaneously or independently, so that the thickness of the catheter body can be adjusted.

[0018] In another preferred embodiment of the present invention, the tail of the catheter body outside the body is connected to a limiting ring, which can be sleeved outside the catheter body. When the catheter body is in a contracted state, the limiting ring tightens the catheter body to limit the shape of the catheter body.

[0019] In the above technical solution, initially, the catheter body is in a contracted state, and the limiting ring is used to tighten the catheter body to restrict the shape of the catheter body, so that the shape of the catheter body is close to round rather than flat, which is conducive to the insertion and removal of the catheter body.

[0020] To achieve the above second purpose, the present invention adopts the following technical scheme: a processing method of a urinary catheter, comprising the following steps: S1, preparing a hard auxiliary guide bar, and applying lubricating oil on the outer surface of the auxiliary guide bar; S2, sleeve an inner wall on the outer surface of the auxiliary guide bar, or wind a circle of inner flexible layer on the outer surface of the auxiliary guide bar, and close the side seam of the inner flexible layer to form an inner wall, and close the front end of the inner wall; S3, fix a plurality of support bars circumferentially spaced on the inner wall, and the front end of the support bar has an arc segment extending forward and inward; S4, wind and fix a circle of outer flexible layer on all support bars, and close the side seam of the outer flexible layer to form an outer wall; S5, close the front end face of the outer wall to form a guide head, close the rear end face between the rear end of the outer wall and the rear end of the inner wall to close the cavity, and the port of the inner wall away from the guide head is the urine outlet;

[0021] S6. A first opening penetrating through the inner wall is processed from the front of the outer wall, and a flexible annular side wall is fixed in the first opening to form a urine inlet; S7. An inner connecting port corresponding to one of the cavities is processed at the front of the outer wall, and a bladder fixing bag body which is arranged outside the outer wall and communicates with the inner connecting port is fixedly connected to the outer wall; S8. A plurality of outer connecting ports which correspond to and communicate with the plurality of cavities are processed at the tail of the outer wall located outside the body; a ventilation branch interface is installed at each outer connecting port; or a joint bag body which is arranged outside the outer wall and communicates with all the outer connecting ports is fixedly connected to the outer wall, and a ventilation main interface is installed on the joint bag body; S9. The auxiliary guide strip in the inner wall is pulled out to discharge the gas in the cavity and the bladder fixing bag body to obtain a urinary catheter in a contracted state.

[0022] The above technical solution uses the auxiliary guide strip as a mold core and then processes it to obtain a catheter in an expanded state. The size of the catheter in the expanded state is larger than that in the contracted state. Processing in the expanded state reduces the processing difficulty due to its larger size.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 The cross-section diagram of the comfortable urinary catheter of the first embodiment in the expanded state is shown in FIG. Figure 1 , all cavities are inflated.

[0026] Figure 2 It is a schematic cross-sectional view of the comfortable urinary catheter of the first embodiment in a contracted state, with all cavities deflated and contracted.

[0027] Figure 3 The cross-section diagram of the comfortable urinary catheter of the first embodiment in the expanded state is shown in FIG. Figure 2 , part of the cavity is inflated and expanded, while part of the cavity is deflated and contracted.

[0028] Figure 4 yes Figure 1 AA section diagram in Figure 1 , the front end of the support bar is not fixed.

[0029] Figure 5 yes Figure 2 BB cross-section diagram Figure 1 , the front end of the support bar is not fixed.

[0030] Figure 6 yes Figure 1 AA section diagram in Figure 2 , the front end of the support bar is fixed.

[0031] Figure 7 yes Figure 2 BB cross-section diagram Figure 2 , the front end of the support bar is fixed.

[0032] The figure marks in the drawings of the specification include: catheter body 1, guide head 11, catheter lumen 12, urine inlet 13, urine outlet 14, inner wall 15, outer wall 16, support bar 17, cavity 18, external connecting port 19, internal connecting port 110, arc segment 111, opening 112, bladder fixing capsule 2, joint capsule 3, ventilation main interface 31, and limiting ring 4. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it is to be understood that the terms “longitudinal”, “lateral”, “vertical”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0036] Embodiment 1

[0037] This embodiment provides a comfortable urinary catheter, such as Figure 1-Figure 5 As shown, in a preferred embodiment, the catheter includes a hollow catheter body 1, the front end of the catheter body 1 is a guide head 11 for entering the bladder, the catheter body 1 is hollow as a catheter cavity 12, the front part of the catheter body 1 is provided with a urine inlet 13 communicating with the catheter cavity 12, and the tail part of the catheter body 1 located outside the body is provided with a urine outlet 14 communicating with the catheter cavity 12.

[0038] The catheter body 1 comprises an inner wall 15, an outer wall 16 arranged outside the inner wall 15, and an adjustment layer arranged between the inner wall 15 and the outer wall 16. The inner wall 15 and the outer wall 16 are both made of flexible and deformable materials, such as a medical soft silicone layer or a medical soft plastic layer. The adjustment layer is provided with a plurality of support strips 17 extending along the length direction of the catheter body 1 and a plurality of strip-shaped cavities 18. The plurality of support strips 17 and the plurality of cavities 18 are arranged circumferentially in an interlaced manner. The support strips 17 are made of medical silicone, rubber, EVA or PV with a certain hardness. The support strips 17 play a supporting role, but are not soft, so as to ensure that the catheter body 1 is advanced in the urethra.

[0039] The inner surface of the support strip 17 is fixed to the inner wall 15 (for example, by bonding and fixing with medical adhesive, specifically, hot melt adhesive or glue), and the outer surface of the support strip 17 is fixed to the outer wall 16 (for example, by bonding and fixing with medical adhesive), and there is a cavity 18 between the support strips 17. By exhausting the gas in the cavity 18 to shrink the cavity 18, two adjacent support strips 17 can approach each other, and the inner diameter and outer diameter of the catheter body 1 are reduced, so that the catheter body 1 is in a contracted state; by inflating the cavity 18 to expand the cavity 18, two adjacent support strips 17 can move away from each other, and the inner diameter and outer diameter of the catheter body 1 are increased, so that the catheter body 1 is in an expanded state.

[0040] Initially, the cavity 18 is in a natural contracted state, the catheter body 1 is in a contracted state, and the outer diameter of the catheter body 1 is small, which is convenient for the insertion of the catheter body 1, and is particularly suitable for patients with urethral stenosis and protrusions on the urethral wall (such as urethral polyps and urethral caruncle). For patients with protrusions on the urethral wall, when inserting under the guidance of a guiding device (such as ultrasound or other methods of the prior art), try to avoid touching the protrusions to reduce damage to the patient's urethral wall. After the catheter body 1 is inserted, the cavity 18 is inflated to expand, and the two adjacent support bars 17 are separated from each other, the inner diameter and outer diameter of the catheter body 1 are increased, the catheter body 1 is in an expanded state, and the catheter body 1 becomes thicker, so that the catheter has the function of catheterization. When the catheter needs to be removed, the gas in the cavity 18 is released to shrink the cavity 18, and two adjacent support bars 17 are moved closer to each other, and the inner and outer diameters of the catheter body 1 are reduced, and the catheter body 1 becomes thinner, which facilitates the removal of the catheter body 1.

[0041] In the present invention, a bladder fixing capsule 2 is provided on the catheter body 1 and is located at the rear side of the urine inlet 13. The bladder fixing capsule 2 is made of medical latex or medical rubber. In normal state, the bladder fixing capsule 2 is not inflated and is in a deflated state. It is attached to the outer wall 16 of the catheter body 1 and can extend into the bladder as the catheter body 1 moves, without affecting the insertion of the catheter body 1. After the catheter body 1 is inserted, the bladder fixing capsule 2 is expanded by inflating it, and the bladder fixing capsule 2 can be stuck in the bladder to fix the catheter body 1 and prevent it from falling off during catheterization. When the catheter body 1 is removed, the gas in the bladder fixing capsule 2 is discharged to shrink it, and the bladder fixing capsule 2 is attached to the outer wall 16 of the catheter body 1 again. The bladder fixing capsule 2 is removed as the catheter body 1 moves outward.

[0042] Preferably, the interior of the bladder fixing balloon 2 is communicated with one of the cavities 18. Specifically, an inner communication port 110 may be provided on the outer wall 16 covered by the bladder fixing balloon 2, and the bladder fixing balloon 2 and the cavity 18 are communicated with each other through the inner communication port 110. After the urinary catheter body 1 is inserted, when the urinary catheter body 1 is expanded by inflating the cavity 18, the bladder fixing balloon 2 communicated with the cavity 18 is also inflated; when the urinary catheter body 1 is removed, when the urinary catheter body 1 is contracted by releasing the gas in the cavity 18, the bladder fixing balloon 2 communicated with the cavity 18 is also deflated and contracted, thereby eliminating the need to separately provide an inflation and deflation channel for inflating and deflation of the bladder fixing balloon 2.

[0043] In the present invention, the tail portion of the outer wall 16 outside the body has multiple external communication ports 19 corresponding to and communicating with the multiple cavities 18. All cavities 18 can work simultaneously to be inflated and deflated, or each cavity 18 can work independently to be inflated and deflated.

[0044] Specifically, when all the cavities 18 work at the same time, the outer wall 16 is fixedly connected with a joint capsule 3 arranged outside the outer wall 16, and the joint capsule 3 is made of medical latex or medical rubber. All external communication ports 19 are connected to the inside of the joint capsule 3. The joint capsule 3 has a ventilation main interface 31 connected to the inside. The external inflation and deflation device is connected to the ventilation main interface 31 through a trachea provided with a valve for inflation and deflation. When the inflation and deflation device inflates the joint capsule 3 through the ventilation main interface 31, the gas in the joint capsule 3 enters each cavity 18 through the external communication port 19, so that all the cavities 18 work at the same time and are inflated at the same time; when the inflation and deflation device extracts gas through the ventilation main interface 31, the gas in the cavity 18 is extracted through the external communication port 19 and the joint capsule 3, so that all the cavities 18 work at the same time and are deflated at the same time.

[0045] When each cavity 18 works independently, a joint bag 3 is not provided, but a ventilation sub-interface is provided at each external connecting port 19. The external inflation and deflation device is connected to the ventilation sub-interfaces at multiple external connecting ports 19 through multiple air pipes with valves provided in parallel, so that each cavity 18 can be inflated and deflated independently.

[0046] In the present invention, the thickness of the catheter body 1 in the expanded state can be changed according to actual conditions to adapt to patients with different urethras. For example, for patients with protrusions on the urethral wall, the outer diameter of the expanded catheter body 1 is reduced as much as possible on the premise that catheterization can be performed smoothly, so as to reduce the squeezing of the protrusions and reduce the damage to the urethral wall; for patients with thicker urethras, the catheter body 1 is expanded as much as possible to the maximum tolerable size to facilitate rapid catheterization.

[0047] like Figure 1As shown, when all cavities 18 work at the same time, the thickness of the catheter body 1 can be adjusted by controlling the total amount of inflation, such as reducing the inflation amount so that each cavity 18 is not so full, thereby reducing the outer diameter of the catheter body 1. Figure 3 As shown, when each cavity 18 works independently, the outer diameter of the catheter body 1 is reduced by reducing the number of cavities 18 inflated and only inflating part of the cavities 18; it should be noted that the cavity 18 connected to the bladder fixing bag 2 must be inflated.

[0048] In the present invention, if Figure 1 As shown, the support bar 17 is an arc-shaped bar with an arc-shaped cross section; Figure 5 As shown, the front end of the support bar 17 has an arc section 111 extending forward and inward. When the catheter body 1 is in a contracted state, the guide head 11 at the front end of the catheter body 1 is hemispherical, which is conducive to the smooth insertion of the catheter body 1.

[0049] like Figure 4 and Figure 5 As shown, in one embodiment, the front ends of all support bars 17 are movably connected, and when the catheter body 1 switches between the contraction state and the expansion state, the inner surfaces of the arc segments 111 at the front ends of the support bars 17 can move closer to or farther from each other. Figure 5 In the retracted state shown in FIG. 1 , the support bar 17 abuts against the inner surface of the arc segment 111 at the front end of the support bar 17, and the cavity 18 is inflated to switch to the retracted state. Figure 4 In the expanded state shown, the support bar 17 and the inner surface of the arc-shaped section 111 at the front end of the support bar 17 are away from each other to adapt to the expansion of the catheter body 1.

[0050] like Figure 6 and Figure 7 As shown, in another embodiment, the front ends of all the support bars 17 are fixedly connected, and the support bars 17 are fixedly connected to the arc-shaped segments 111 at the front ends of the support bars 17. The outer walls 16 at the front ends of all the support bars 17 are provided with openings 112, and the openings 112 are located near the urine inlet 13 above the bladder fixing capsule 2. When the urinary catheter body 1 switches between the contraction state and the expansion state, the front ends of the support bars 17 can be bent through the openings 112. For example Figure 7 In the retracted state shown, the two sides of the opening 112 at the front of the support bar 17 are in a straight line, and the cavity 18 is inflated to switch to Figure 6 In the expanded state shown, the front portion of the support strip 17 is bent through the opening 112 to accommodate the expansion of the catheter body 1 .

[0051] like Figure 4 and Figure 5As shown, in another preferred embodiment, the tail of the catheter body 1 outside the body is connected to a limiting ring 4, and the limiting ring 4 can be set outside the catheter body 1. When the catheter body 1 is in a contracted state, the limiting ring 4 clamps the catheter body 1 to limit the shape of the catheter body 1. The specific structure of the limiting ring 4 can adopt the unlockable nylon binding belt in the prior art. The nylon binding belt should be wide enough to limit the shape of the catheter body 1. The specific width can be obtained through experiments. Initially, the catheter body 1 is in a contracted state, and the limiting ring 4 clamps the catheter body 1 to limit the shape of the catheter body 1, so that the shape of the catheter body 1 is close to round rather than flat, which is conducive to the insertion and removal of the catheter body 1; after insertion, the limiting ring 4 is unlocked or the limiting ring 4 is relaxed, which does not affect the inflation of the catheter body 1.

[0052] Embodiment 2

[0053] This embodiment provides a method for processing a urinary catheter based on the first embodiment, comprising the following steps:

[0054] S1. Prepare a hard auxiliary guide bar, the outer diameter of which is adapted to the inner diameter of the catheter body 1 when it is fully expanded, and the outer surface of which is smooth. Apply lubricating oil on the outer surface of the auxiliary guide bar to facilitate the subsequent removal of the catheter from the auxiliary guide bar.

[0055] S2. An inner wall 15 is sleeved on the outer surface of the auxiliary guide strip, or an inner flexible layer is wrapped around the outer surface of the auxiliary guide strip, and the side seams (seams extending along the length direction) of the inner flexible layer are closed to form the inner wall 15, and the front end of the inner wall 15 is closed, and the rear end of the inner wall 15 is the urine outlet 14, which does not need to be closed. The closing method can adopt the conventional method of fixing medical rubber in the prior art, such as bonding with medical glue or hot-melt bonding.

[0056] S3. A plurality of support strips 17 are fixedly connected (for example, by bonding with medical glue) at circumferential intervals on the outer surface of the inner wall 15, and the front end of the support strip 17 has an arc section 111 extending forward and inward. Accordingly, the front end of the auxiliary guide strip is adapted to the inner surface of the front end of the catheter body 1 when it is fully expanded, so that the inner surface of the front end of the support strip 17 and the outer surface of the front end of the auxiliary guide strip can fit together through the inner wall 15.

[0057] S4, wrap and fix a circle of outer flexible layer on all support strips 17, and close the side seams of the outer flexible layer to form an outer wall 16. When winding the outer flexible layer, fix the inner surface of the outer flexible layer to the outer surface of the support strip 17 while wrapping.

[0058] S5, the front end surface of the outer wall 16 is closed to form the guide head 11, and the rear end surface between the rear end of the outer wall 16 and the rear end of the inner wall 15 is closed to close the rear end of the cavity 18, and the port of the inner wall 15 away from the guide head 11 is the urine outlet 14;

[0059] S6. A first opening is processed from the front of the outer wall 16 (using a heated metal wire) to penetrate the inner wall 15, and a flexible annular side wall is fixed in the first opening (to prevent the first opening from communicating with the cavity 18), so as to form the urine inlet 13.

[0060] S7. An inner communication opening 110 corresponding to one of the cavities 18 is processed at the front of the outer wall 16 , and a bladder fixing bag body 2 arranged outside the outer wall 16 and communicating with the inner communication opening 110 is fixedly connected to the outer wall 16 .

[0061] S8. A plurality of external communication ports 19 corresponding to and communicating with the plurality of cavities 18 are processed at the tail of the outer wall 16 outside the body. When each cavity 18 works independently, a ventilation sub-interface is installed at each external communication port 19; when all cavities 18 work simultaneously, a joint capsule 3 arranged outside the outer wall 16 and communicating with all the external communication ports 19 is fixedly connected, and a ventilation main interface communicating with the interior of the joint capsule 3 is installed on the joint capsule 3.

[0062] S9, extract the auxiliary guide strip in the inner wall 15, discharge the gas in the cavity 18 and the bladder fixing bag 2, and obtain the urinary catheter in the initial contraction state, and then disinfect and sterilize the urinary catheter and package it.

[0063] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A comfortable urinary catheter, comprising a hollow urinary catheter body, the front end of the urinary catheter body being a guide head for entering the bladder, the hollow part of the urinary catheter body being a urinary catheter lumen, the front part of the urinary catheter body being provided with a urine inlet communicating with the urinary catheter lumen, the tail part of the urinary catheter body being located outside the body being provided with a urine outlet communicating with the urinary catheter lumen, It is characterized by: The catheter body comprises an inner wall, an outer wall arranged outside the inner wall, and an adjustment layer arranged between the inner wall and the outer wall, the inner wall and the outer wall are both made of flexible and deformable materials, the adjustment layer is provided with a plurality of support strips extending along the length direction of the catheter body and a plurality of strip-shaped cavities, and the plurality of support strips and the plurality of cavities are circumferentially staggered; The inner surface of the support bar is fixedly connected to the inner wall, the outer surface of the support bar is fixedly connected to the outer wall, and the cavity is between the support bars; By exhausting the gas in the cavity to shrink the cavity, two adjacent support bars can approach each other, and the inner diameter and outer diameter of the catheter body are reduced, so that the catheter body is in a contracted state; By inflating air into the cavity to expand the cavity, two adjacent support bars can move away from each other, and both the inner diameter and the outer diameter of the catheter body are increased, so that the catheter body is in an expanded state.

2. The comfortable urinary catheter according to claim 1, characterized in that: The urinary catheter body is provided with a bladder fixing bag body located at the rear side of the urine inlet; The bladder fixing balloon can be extended into the bladder along with the movement of the urinary catheter body by exhausting the gas in the bladder fixing balloon to make it shrink; By inflating the bladder fixing balloon to expand it, the bladder fixing balloon can be clamped in the bladder to fix the urinary catheter body.

3. The comfortable urinary catheter according to claim 2, characterized in that: The bladder fixing bag is communicated with one of the cavities.

4. The comfortable urinary catheter according to claim 1, characterized in that: The support bar is an arc-shaped bar with an arc-shaped cross section, and the front end of the support bar has an arc-shaped section extending forward and inward.

5. The comfortable urinary catheter according to claim 4, characterized in that: The front ends of all the support strips are movably connected, and when the catheter body switches between the contraction state and the expansion state, the inner surfaces of the arc-shaped sections at the front ends of the support strips can move closer to and farther from each other; Or the front ends of all the support strips are fixedly connected, and the outer walls of the front parts of all the support strips are provided with openings, and when the catheter body switches between the contracted and expanded states, the front parts of the support strips can be bent through the openings.

6. The comfortable urinary catheter according to claim 1, characterized in that: The inner wall and the outer wall are both made of soft silicone layer or soft plastic layer; And / or the support strip is made of silicone, rubber, EVA or PV with a certain hardness.

7. The comfortable urinary catheter according to any one of claims 1 to 6, characterized in that: All the cavities can work simultaneously to be inflated and deflated simultaneously, or each cavity can work independently to be inflated and deflated independently, and the tail portion of the outer wall outside the body has a plurality of external communication ports corresponding to and communicating with the plurality of cavities one by one; When all cavities work at the same time, the outer wall is fixedly connected with a joint capsule ring arranged outside the outer wall, and all external communication ports are communicated with the inside of the joint capsule. The joint capsule has a ventilation main interface communicated with the inside, and the inflation and deflation device is connected to the ventilation main interface through an air pipe; When each cavity works independently, a ventilation branch interface is provided at each external communication port, and the gas charging and discharging device is respectively connected to the plurality of ventilation branch interfaces through a plurality of air pipes arranged in parallel.

8. The comfortable urinary catheter according to any one of claims 1 to 6, characterized in that: The tail of the catheter body outside the body is connected to a limiting ring, and the limiting ring can be sleeved outside the catheter body. When the catheter body is in a contracted state, the limiting ring tightens the catheter body to limit the shape of the catheter body.

9. A method for processing a urinary catheter according to any one of claims 1 to 7, characterized in that: The steps include: S1. Prepare a hard auxiliary guide bar and apply lubricating oil on the outer surface of the auxiliary guide bar; S2, sleeve the inner wall on the outer surface of the auxiliary guide bar, or wrap a circle of the inner flexible layer on the outer surface of the auxiliary guide bar and seal the side seam of the inner flexible layer to form the inner wall, and seal the front end of the inner wall; S3, a plurality of support bars are fixedly connected to the inner wall at intervals in a circumferential direction, and the front ends of the support bars have arc sections extending forward and inward; S4, winding and fixing a circle of outer flexible layer on all support bars, and closing the side seams of the outer flexible layer to form the outer wall; S5, closing the front end face of the outer wall to form the guide head, closing the rear end face between the rear end of the outer wall and the rear end of the inner wall to close the cavity, and the port of the inner wall away from the guide head is the urine outlet; S6, machining a first opening penetrating through the inner wall from the front of the outer wall, and fixing a flexible annular side wall in the first opening to form the urine inlet; S7, processing an inner communication port corresponding to one of the cavities at the front of the outer wall, and fixing a bladder fixing bag body arranged outside the outer wall and communicating with the inner communication port; S8, processing a plurality of external communication openings corresponding to and communicating with the plurality of cavities on the tail portion of the outer wall outside the body; A ventilation sub-interface is installed at each external communication port; or a joint capsule body is fixedly connected to the outer wall and arranged outside the outer wall and communicates with all the external communication ports, and a ventilation main interface is installed on the joint capsule body; S9. Pull out the auxiliary guide strip in the inner wall, discharge the gas in the cavity and the bladder fixing bag, and obtain a urinary catheter in a contracted state.

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