Search

CN-224220494-U - Disposable ureteral stent

CN224220494UCN 224220494 UCN224220494 UCN 224220494UCN-224220494-U

Abstract

The utility model relates to the technical field of medical appliances, in particular to a disposable ureteral stent which comprises a connecting tube section, a renal pelvis tube section and a bladder tube section, wherein one end of the connecting tube section is connected with the renal pelvis tube section, the other end of the connecting tube section is connected with the bladder tube section, guide holes are formed in the head end and the tail end of the renal pelvis tube section, the bladder tube section and the connecting tube section, a current limiting channel gradually shrinking from the renal pelvis tube section to the bladder tube section is formed in one end of the connecting tube section, which is close to the bladder tube section, a valve circumferentially distributed along the inner wall of the connecting tube section is arranged at an input end port of the current limiting channel, the current limiting channel is matched with the dynamic seal of an elastic valve through the fluid resistance gradient of the current limiting channel, the current limiting channel can maintain a low pressure area, the difficulty of reversely entering the current limiting channel is increased by utilizing the liquid tension, the current limiting pressure is prevented from being conducted to the renal pelvis, the current limiting resistance is increased, and the current limiting speed is reduced.

Inventors

  • XIONG AO

Assignees

  • 湖南唯德康医疗科技有限公司

Dates

Publication Date
20260512
Application Date
20250603

Claims (7)

  1. 1. The disposable ureteral stent is characterized by comprising a connecting pipe section (1), a renal pelvis pipe section (2) and a bladder pipe section (3), wherein one end of the connecting pipe section (1) is connected with the renal pelvis pipe section (2), the other end of the connecting pipe section is connected with the bladder pipe section (3), and guide holes (4) are formed in the head end and the tail end of the renal pelvis pipe section (2), the bladder pipe section (3) and the connecting pipe section (1); one end of the connecting pipe section (1) close to the bladder pipe section (3) protrudes inwards to form a flow limiting channel (11) which gradually contracts from the renal pelvis pipe section (2) to the bladder pipe section (3), and valves (12) circumferentially distributed along the inner wall of the connecting pipe section (1) are installed at the input end port of the flow limiting channel (11).
  2. 2. The single use ureteral stent according to claim 1, characterized in that the restriction channel (11) comprises a primary constriction (111), a primary straight line (112), a secondary constriction (113) and a secondary straight line (114) in communication in sequence, the primary constriction (111) being arranged close to the valve (12) and the valve (12) being arranged between the renal pelvis tube section (2) and the primary constriction (111).
  3. 3. The single use ureteral stent according to claim 1, characterized in that the valve (12) has elasticity and the valve (12) deflects to one side of the bladder segment (3).
  4. 4. The single use ureteral stent according to claim 1, characterized in that the valve (12) comprises at least two layers of half-moon shaped valves (12) which are staggered, the valve (12) comprises 2-4 layers of valves (12), and the opening and closing directions of the adjacent layers of valves (12) are staggered at 30-180 degrees.
  5. 5. The single use ureteral stent according to claim 1, characterized in that the valve (12) surface is covered with a nano-hydrophobic coating.
  6. 6. The disposable ureteral stent according to claim 1, characterized in that the connecting pipe section (1) is concavely formed with a diversion trench (13) extending along the axial direction of the connecting pipe section (1), the head end of the diversion trench (13) is positioned at the renal pelvis pipe section (2), and the tail end of the diversion trench (13) is distributed with the bladder pipe section (3) at intervals.
  7. 7. The disposable ureteral stent according to claim 6, characterized in that the distance between the tail end of the guide groove (13) and the bladder tube section (3) is 10-30mm.

Description

Disposable ureteral stent Technical Field The utility model relates to the technical field of medical appliances, in particular to a disposable ureteral stent. Background The ureteral stent (a double-pigtail catheter or D-J tube) has extremely wide application in urological surgery, is suitable for the treatment processes of upper urinary tract operations such as kidney stones, ureteral stones, hydronephrosis, kidney transplantation, benign tumors of kidneys and ureters and the like, lithotripter lithotripsy, ureteral stenosis and the like, and can play an important role in draining urine and preventing ureteral stenosis and adhesion blockage after being implanted into a ureter. Most of the clinically applied D-J tubes are made of silicon rubber or polyurethane polymer materials. The existing ureteral stent generally adopts a one-way valve or a narrow section design to realize the backflow prevention function, but has the technical defects that the traditional one-way valve has poor tightness under a low-pressure state and is easy to cause backflow due to sticky urine or sediment residues, the narrow section can limit the backflow, but obviously reduce the forward urine flow rate and increase the renal pelvis pressure, and the backflow prevention structure and the pipe section have low integration level and are easy to shift or deform after long-term use. Disclosure of utility model The utility model aims to solve the technical problems that the traditional one-way valve in the prior art is poor in tightness in a low-pressure state and is easy to cause countercurrent due to sticky urine or sediment residues, and the narrow section can limit the countercurrent, but obviously reduce the forward urine flow rate and increase the renal pelvis pressure. The technical scheme adopted for solving the technical problems is that the disposable ureteral stent comprises a connecting pipe section, a renal pelvis pipe section and a bladder pipe section, wherein one end of the connecting pipe section is connected with the renal pelvis pipe section, the other end of the connecting pipe section is connected with the bladder pipe section, and guide holes are arranged on the head end and the tail end of the renal pelvis pipe section, the bladder pipe section and the connecting pipe section; the connecting pipe section is protruded in one end close to the bladder pipe section to form a current limiting channel gradually shrinking from the renal pelvis pipe section to the bladder pipe section, valves distributed along the circumferential direction of the inner wall of the connecting pipe section are installed at the input end port of the current limiting channel, the current limiting channel is matched with the dynamic seal of the elastic valve through the fluid resistance gradient of the current limiting channel, the current limiting channel can obviously improve the reverse flow inhibition efficiency, the current limiting channel can maintain a low pressure area and increase the difficulty of reversely entering the current limiting channel by utilizing the liquid tension, the reverse flow pressure is prevented from being conducted to the renal pelvis, the reverse flow resistance is increased, and the reverse flow speed is reduced. In order to solve the problem of insufficient backflow prevention efficiency of the single contraction section, the device further comprises a flow limiting channel, wherein the flow limiting channel comprises a first contraction section, a first straight line section, a second contraction section and a second straight line section which are sequentially communicated, the first contraction section is arranged close to a valve, and the valve is arranged between a renal pelvis pipe section and the first contraction section. In order to solve the problem of sealing failure caused by reverse overturning of the valve, the valve further comprises elasticity, and the valve deflects to one side of the bladder pipe section. In order to solve the problem of insufficient tightness of the single-layer valve, the valve further comprises at least two layers of half-moon-shaped valves which are staggered, wherein the valve comprises 2-4 layers of valves, and the opening and closing directions of the valves of the adjacent layers are staggered at 30-180 degrees. In order to solve the problem of attachment of urinary salt crystals on the valve surface, the valve surface is further covered with a nano hydrophobic coating. In order to solve the problem of drainage interruption caused by the blockage of the main channel, the device further comprises a diversion trench which is concavely formed on the connecting pipe section and extends along the axial direction of the connecting pipe section, wherein the head end of the diversion trench is positioned at the renal pelvis pipe section, and the tail end of the diversion trench and the bladder pipe section are distributed at intervals. In order to solve the problem that tur