A variable diameter urinary catheter

Abstract

The present invention relates to a variable diameter urinary catheter, belonging to the technical field of medical devices. A variable diameter mechanism is provided on the inner side wall of the tube body along the axial direction of the catheter; the variable diameter mechanism includes a driving part and a force-deformed part; the driving part and the force-deformed part are respectively provided on the tube wall where two lines intersecting the longitudinal section along the central axis of the catheter and the tube wall of the catheter are located; the force-deformed part includes an elastic variable diameter tube wall. With the variable diameter urinary catheter provided by the present invention, when removing the catheter, the tube diameter can be reduced, the balloon can be folded, and lubricants / antibiotics / anti-inflammatory drugs can be sprayed, which greatly reduces the patient's pain and can prevent the occurrence of urinary system inflammation. The present invention is simple to manufacture, low in cost, and is conducive to popularization and use.

Description

Technical Field

[0001] The invention relates to a variable-diameter urinary catheter, belonging to the technical field of medical devices. Background Art

[0002] Catheterization involves inserting a catheter through the urethra into the bladder to drain urine. A urinary catheter is an essential tool for this procedure. A widely used double-lumen balloon catheter features a catheter hole on the front sidewall, a balloon attached to the outer wall of the intravesical section, and a port at the rear that connects to a urine storage bag. During use, the catheter is inserted into the urethra. To prevent the catheter from slipping out of the urethra, a syringe is used to fill the balloon with saline through the injection port at the rear end of the catheter to inflate the balloon and secure it in place. To remove the catheter, the saline in the balloon is first withdrawn with a syringe before removal. However, prolonged indwelling of the catheter within the urethra can lead to adhesions between the catheter and the urethra. This friction during removal can cause unbearable pain for the patient. Furthermore, damage to the urethral wall can easily lead to urinary tract infections, further exacerbating the patient's pain. Because the balloon remains in an inflated state for a long time, it cannot deflate in time after saline is extracted when it is removed. It is also easy to cause secondary damage to the patient's urethra when the catheter is removed.

[0003] 1. The patented "Disposable Sterile Urethral Catheter" with authorization announcement number CN208389055U lubricates the urethra by injecting medication into the urethra through the injection hole at the front end of the catheter body. However, the catheter wall is tightly adhered to the urethra, preventing extensive and thorough infiltration of the urethra, resulting in poor results.

[0004] 2. Patent No. CN204106801U, "A Retractable Urethral Catheter," uses a pull-wire to move a hinge, deforming a rigid support rod and thus changing the catheter's diameter. However, the structure is complex and the production cost is high. The hinge can only move in one direction, and the catheter's diameter cannot be retracted, but can only be expanded (the flexible hose has the largest diameter when the rigid support rod is perpendicular to the flexible support rod).

[0005] 3. Patent No. CN204106801U, "A Retractable Urethral Catheter," adjusts the catheter's diameter by injecting and withdrawing saline solution into a tubular stent. This patent completely abandons the design of balloons at both ends of the catheter. Instead, the catheter is stuck in the urethra by inflating the front end, making it less feasible. The catheter can easily slip out of the urethra, and the tubular stent lacks rigid support, making it unable to maintain its spiral shape for a long time.

[0006] Therefore, there is an urgent need in the art for a urinary catheter that is convenient, safe, painlessly removable, and can prevent urinary tract infection. Summary of the Invention

[0007] The purpose of the present invention is to solve the technical problem of how to obtain a urinary catheter which is convenient, safe and painless to remove and can avoid urinary tract infection.

[0008] In order to achieve the purpose of solving the above-mentioned problems, the technical solution adopted by the present invention is to provide a variable-diameter urinary catheter, in which a diameter-changing mechanism is provided on the inner side wall of the tube body along the axial direction of the catheter; the diameter-changing mechanism includes a driving part and a force-deformed part; the driving part and the force-deformed part are respectively arranged on the tube wall where two lines intersecting the longitudinal section along the central axis of the catheter and the tube wall of the catheter are located; the force-deformed part includes an elastic tube wall that can be recessed toward the central axis of the catheter.

[0009] Preferably, the driving part includes a pull wire channel provided on the inner wall of the tube along the axial direction of the catheter, and a pull wire is provided in the pull wire channel; the force-bearing deformation part includes a pull wire fixing point provided on the inner wall of the tube along the axial direction of the catheter; one end of the pull wire passes through the pull wire channel and is connected to the pull wire fixing point along the radial direction of the catheter.

[0010] Preferably, the end of the urinary catheter close to the operator is provided with a telescopic bellows for fixing and pulling the other end of the pull wire;

[0011] Preferably, a plurality of pull wire fixing points are provided on the inner wall of the catheter; the plurality of pull wire fixing points are provided on a virtual line along the axial direction of the catheter; the virtual line is parallel to the pull wire channel, and the virtual line and the pull wire channel are respectively provided on two lines where a virtual plane along the central axis of the catheter intersects with the tube walls on both sides.

[0012] Preferably, the pull wire channel is a pull wire tube, which is provided with multiple pull wire outlets, and the connecting line between the pull wire outlets and the corresponding pull wire fixing points is arranged on the cross section of the catheter perpendicular to the central axis of the catheter, and the connecting line between the pull wire outlets and the corresponding pull wire fixing points passes through the central axis of the catheter; or the pull wire channel is composed of multiple pull wire rings, and the connecting line between each pull wire ring and the corresponding pull wire fixing point is arranged on the cross section of the catheter perpendicular to the central axis of the catheter, and the connecting line between each pull wire ring and the corresponding pull wire fixing point passes through the central axis of the catheter.

[0013] Preferably, tube walls made of flexible material are provided on both sides of a virtual line formed by a plurality of pull-wire fixing points along the catheter, which is used for pulling the pull-wire to cause deformation of the inner diameter of the catheter.

[0014] Preferably, a drug injection tube is provided on the outer wall of the urinary catheter.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The inner diameter of the urinary catheter provided by the present invention can be adjusted. When the urinary catheter is removed, the patient's pain can be greatly reduced by reducing the diameter of the catheter, closing the balloon, spraying lubricants / antibiotics / anti-inflammatory drugs, etc., and the occurrence of urinary system inflammation can be prevented. The present invention is simple to manufacture, low in cost, and can be widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a variable diameter urinary catheter according to the present invention;

[0018] Figure 2 This is a schematic diagram of a variable diameter urinary catheter after contraction according to the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the front and back changes in the inner diameter of a variable-diameter urinary catheter in Example 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of a variable-diameter urinary catheter in Example 1 of the present invention;

[0021] Figure 5 This is a schematic diagram of the internal pull wire structure (pull wire loop) of a variable diameter urinary catheter in Example 1 of the present invention;

[0022] Figure 6 This is a schematic diagram of the internal pull wire structure of a variable diameter urinary catheter (pull wire tube) in Example 1 of the present invention;

[0023] Figure 7 Schematic diagram of the cross-sectional structure of a variable diameter urinary catheter balloon in Example 1 of the present invention Figure 1 ;

[0024] Figure 8 Schematic diagram of the cross-sectional structure of a variable diameter urinary catheter balloon in Example 1 of the present invention Figure 2 ;

[0025] Figure 9 for Figure 2 Enlarged schematic diagram of position I in the middle.

[0026] Figure numerals: 1. Catheter; 2. Balloon; 3. Pull wire loop; 4. Pull wire; 5. Pull wire fixing point; 6. Pull wire tube; 7. Urethral wall; 8. Injection tube; 9. Bellows; 10. Urine bag connection port; 11. Urine bag; 12. Balloon pull wire; 13. Hard section; 14. Soft section; 15. Water inlet. DETAILED DESCRIPTION

[0027] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0028] like Figure 1-8As shown, the present invention provides a variable diameter urinary catheter 1, wherein a variable diameter mechanism is provided on the inner side wall of the tube body along the axial direction of the urinary catheter 1; the variable diameter mechanism includes a driving portion and a force-bearing deformation portion; the driving portion and the force-bearing deformation portion are respectively provided on the tube wall where two lines intersecting with the tube wall of the urinary catheter 1 in a longitudinal section along the central axis of the urinary catheter 1 are located; the force-bearing deformation portion includes an elastic tube wall that can be recessed toward the central axis of the urinary catheter 1.

[0029] The drive portion includes a pull-wire channel provided along the axial inner wall of the catheter 1, in which a pull-wire 4 is provided. The force-deformable portion includes a pull-wire fixing point 5 provided along the axial inner wall of the catheter 1. One end of the pull-wire 4 extends through the pull-wire channel and is connected to the pull-wire fixing point 5 along the radial direction of the catheter 1. A telescopic bellows 9 is provided at the end of the catheter 1 closest to the operator, for fixing and pulling the other end of the pull-wire 4. The inner wall of the catheter 1 is provided with multiple pull-wire fixing points 5. These multiple pull-wire fixing points 5 are provided on a virtual line along the axial direction of the catheter 1. This virtual line is parallel to the pull-wire channel, and the virtual line and the pull-wire channel are respectively provided on two lines intersecting a virtual plane along the central axis of the catheter 1 and the tube walls on both sides. On both sides of the virtual line formed by the multiple pull-wire fixing points 5 along the catheter 1 are tube walls made of a flexible material, which is used to pull the pull-wire 4 and cause the inner diameter of the catheter 1 to deform.

[0030] The pull wire channel is a pull wire tube 6, which is provided with multiple pull wire 4 outlets. The connecting line between the pull wire outlet 4 and the corresponding pull wire fixing point 5 is set on the catheter cross section perpendicular to the central axis of the catheter 1; the connecting line between the pull wire outlet and the corresponding pull wire fixing point 5 passes through the central axis of the catheter 1.

[0031] In another embodiment, the pull wire channel can also be composed of multiple pull wire rings 3, and the connecting line between each pull wire ring 3 and the corresponding pull wire fixing point 5 is arranged on the cross section of the catheter perpendicular to the central axis of the catheter 1, and the connecting line between each pull wire ring 3 and the corresponding pull wire fixing point 5 passes through the central axis of the catheter 1.

[0032] A drug injection tube 8 is provided on the outer wall of the urinary catheter 1 .

[0033] The present invention aims to design a catheter with adjustable inner diameter. When removing the catheter, the catheter 1 can be reduced in diameter, the balloon 2 can be collapsed, and drugs can be injected for lubrication, thereby alleviating the patient's pain during removal and reducing the incidence of inflammation at the urethral lesion.

[0034] Example

[0035] like Figure 1 、 Figure 2As shown, the present invention provides a variable-diameter urinary catheter 1, wherein a balloon 2 is provided on the outer wall of the end of the urinary catheter 1 away from the operator, and the balloon 2 is arranged in a circle around the urinary catheter 1; a plurality of pull-wire rings 3 are provided on the inner side of the tube wall along the axial direction of the urinary catheter 1, and the plurality of pull-wire rings 3 form a pull-wire channel, in which a pull-wire is provided; a telescopic bellows 9 for fixing a pull-wire 4 is provided at the end of the urinary catheter 1 close to the operator; the pull-wire 4 in the urinary catheter 1 can be tied through the inherent groove of the bellows 9, thereby achieving the effect of fixing the pull-wire 4; after the catheterization is completed, the bellows 9 is stretched by pulling the bellows 9, thereby simultaneously pulling the pull-wire 4 in the urinary catheter 1 to achieve the effect of shrinking the diameter of the urinary catheter 1, thereby facilitating the removal of the urinary catheter 1.

[0036] The end of the bellows 9 close to the operator is provided with a conical urine bag connection port 10, such as Figure 9 As shown, it is convenient to plug in various types of urine bags 11 , and a thread is provided on the inner wall of the urine bag connecting port 10 to increase the friction between the urine bag connecting port 10 and the urine bag 11 .

[0037] like Figure 3 As shown, a wire pulling channel composed of a plurality of wire pulling rings 3 is provided along the inner side of the tube wall of the urinary catheter 1 in the axial direction, and a plurality of wire pulling wires are provided in the wire pulling channel; the wire pulling wires include a wire pulling wire 4 for deforming the inner diameter of the urinary catheter 1; in the urinary catheter, one end of the wire pulling wire 4 passes through the wire pulling channel and is connected to a wire pulling fixing point 5 provided on the tube wall on the other side of the urinary catheter 1 along the radial direction of the urinary catheter 1; as shown in FIG. Figure 5 As shown, the line between each pull wire loop 3 and the corresponding pull wire fixing point 5 is set on the cross section of the catheter perpendicular to the central axis of the catheter 1, and the line between each pull wire loop 3 and the corresponding pull wire fixing point 5 passes through the central axis of the catheter 1. The pull wire fixing point 5 is set on the elastic tube wall of the catheter 1; when the pull wire 4 is pulled, the pull wire between the pull wire fixing point 5 and the pull wire loop 3 becomes shorter, and the tube wall around the pull wire fixing point 5 collapses and deforms toward the center of the catheter 1, thereby shrinking the inner diameter of the catheter 1; the pull wire 4 is pulled until the tube wall of the catheter 1 collapses, changing from the previous circular cross section to a heart-shaped cross section, and the tube diameter is reduced, which reduces the adhesion and friction between the catheter 1 and the urethral wall 7, and also provides sufficient diffusion space for the lubricant / antibiotic agent / anti-inflammatory drug injected through the injection tube 8; it is convenient to remove the catheter 1, relieve the patient's pain, and reduce the incidence of inflammation at the urethral lesion.

[0038] Another embodiment is to use the above-mentioned multiple wire drawing rings 3 instead of one wire drawing tube 6, such as Figure 6As shown, the wire tube 6 is provided with multiple outlets for the wires 4. A wire exit ring is provided at the position where the wires 4 pass through the wire tube 6. The line connecting the outlets of the wires 4 and the corresponding wire fixing points 5 is provided on a cross section of the catheter 1 perpendicular to the central axis of the catheter 1, and the line connecting the outlets of the wires 4 and the corresponding wire fixing points 5 passes through the central axis of the catheter 1. When the wires 4 are pulled, the wires between the wire fixing points 5 and the wire exit ring shorten, and the tube wall around the wire fixing points 5 collapses and deforms, shrinking toward the center of the catheter 1, thereby reducing the inner diameter of the catheter 1.

[0039] like Figure 4 As shown, the wall of the urinary catheter 1 consists of at least two sections of varying hardness. The harder hard section 13 forms the majority of the catheter 1's wall. From a cross-sectional view, the hard section 13 forms an open ring, while the soft section 14 is located at the opening. The hard and soft sections 13, 14 combine to form a single cylindrical shape. The urinary catheter 1 is constructed of silicone / latex. The hard and soft sections 13, 14 can be made of two materials of different hardness, or they can be made of the same material, with the hard section 13 being thicker than the soft section 14. Thinner sections are more easily deformed.

[0040] like Figure 4 As shown, there are multiple pull wire fixing points 5 distributed axially along the wall of the catheter 1, and the multiple pull wire fixing points 5 form a virtual line. On both sides of the virtual line are tube walls made of flexible material for pulling the pull wire 4 to cause the inner diameter of the catheter 1 to deform.

[0041] The entry of the catheter 1 into the urethra requires that the catheter 1 has a certain hardness, and the hard section 13 provides this support; the soft section 14 makes the cross section of the catheter 1 circular when the catheter 1 is filled, and when the pull wire 4 is pulled, the soft section 14 moves closer to the central axis of the catheter 1, causing the tube wall formed by the soft section 14 to collapse and become a heart-shaped cross section, thereby reducing the diameter of the catheter 1.

[0042] The wall material of the existing urinary catheter 1 is mainly silicone or latex. In order to make the wall at the pull wire fixing point 5 collapse better, the wall near the pull wire fixing point 5 along the axial direction of the urinary catheter 1 can be thinned during manufacturing to facilitate pulling deformation.

[0043] like Figure 1 、 Figure 2 、 Figure 7 、 Figure 8As shown, a balloon pull line 12 for connecting to the inner wall of the balloon 2 is also provided in the water injection pipe connected to the balloon 2; a balloon pull line fixing point is provided on the inner wall of the balloon 2, one end of the balloon pull line 12 is connected to the balloon pull line fixing point on the inner wall of the balloon 2, and the other end of the balloon pull line 12 is led out from the water injection port 15 on the side of the urinary catheter 1 close to the operator; the balloon 2 is attached to the outer side of the tube wall of the bladder cavity section of the urinary catheter 1, and the end of the urinary catheter 1 close to the operator is provided with a water injection port 15; a syringe can be used to inject physiological saline through the water injection port 15 to expand the balloon 2 (as shown in FIG. Figure 1 when it is necessary to remove the catheter 1, first, the water in the balloon 2 is sucked from the water inlet 15 to shrink the balloon 2, while pulling the pull line 4 and the balloon pull line 12 to reduce the diameter of the catheter and further reduce the balloon 2.

[0044] like Figure 3 As shown, a drug injection tube 8 is provided on the outer wall of the catheter 1; the drug injection tube 8 is arranged along the axial direction of the catheter 1, and the outlet of the drug injection tube 8 is provided at the junction of the balloon 2 and the stress-deformed part. Lubricant / antibiotic agent / anti-inflammatory drug can be injected into the space between the urethra and the catheter 1 through the drug injection tube 8. After the catheter 1 contracts, these substances have a larger diffusion space, which makes it easier to remove the catheter 1, relieves the patient's pain, and reduces the incidence of inflammation at the lesion.

[0045] Use of the present invention:

[0046] Insertion of the urinary catheter 1 is similar to other urinary catheters;

[0047] When pulling out the urinary catheter 1, first extract the normal saline in the balloon 2 and inject lubricant / antibiotic / anti-inflammatory drugs; then pull the corrugated tube 9, thereby pulling the pull wire 4 and the balloon pull wire 12, the diameter of the urinary catheter 1 becomes thinner, the balloon 2 gathers inward, and the urinary catheter 1 can be pulled out. The operation is simple.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form or substance. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the scope of protection of the present invention. Any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the spirit and scope of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A variable diameter urinary catheter, characterized in that: A diameter-changing mechanism is provided on the inner side wall of the catheter body along the axial direction; the diameter-changing mechanism includes a driving portion and a force-deformable portion; the driving portion and the force-deformable portion are respectively provided on the catheter wall at two lines intersecting the catheter wall in a longitudinal section along the central axis of the catheter; the force-deformable portion includes an elastic wall that can be recessed toward the central axis of the catheter; The driving part includes a wire pulling channel provided along the inner wall of the catheter in the axial direction, in which a wire pulling channel is provided; the force-bearing deformation part includes a wire pulling fixing point provided on the inner wall of the catheter in the axial direction; one end of the wire pulling channel passes through the wire pulling channel and is connected to the wire pulling fixing point along the radial direction of the catheter; The inner wall of the catheter is provided with multiple pull wire fixing points; the multiple pull wire fixing points are arranged on a virtual line along the axial direction of the catheter; the virtual line is parallel to the pull wire channel, and the virtual line and the pull wire channel are respectively arranged on two lines where a virtual plane along the central axis of the catheter intersects with the tube walls on both sides.

2. The variable diameter urinary catheter according to claim 1, characterized in that: The end of the urinary catheter close to the operator is provided with a telescopic bellows for fixing and pulling the other end of the pull wire.

3. The variable diameter urinary catheter according to claim 2, characterized in that: The pull wire channel is a pull wire tube, which is provided with multiple pull wire outlets. The connecting line between the pull wire outlets and the corresponding pull wire fixing points is set on the cross section of the catheter perpendicular to the central axis of the catheter, and the connecting line between the pull wire outlets and the corresponding pull wire fixing points passes through the central axis of the catheter; or the pull wire channel is composed of multiple pull wire rings, and the connecting line between each pull wire ring and the corresponding pull wire fixing point is set on the cross section of the catheter perpendicular to the central axis of the catheter, and the connecting line between each pull wire ring and the corresponding pull wire fixing point passes through the central axis of the catheter.

4. The variable diameter urinary catheter according to claim 3, characterized in that: Both sides of a virtual line formed by a plurality of pull-wire fixing points along the urinary catheter are provided with tube walls made of flexible material for causing the inner diameter of the urinary catheter to deform due to pulling of the pull-wires.

5. The variable diameter urinary catheter according to claim 1, characterized in that: A medicine injection tube is provided on the outer wall of the urinary catheter.

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