CN217390964U - Degradable ureter stent - Google Patents

Abstract

The utility model relates to a degradable ureteral stent, including the support main part, the upper end of support main part is provided with the mouth, and the lower extreme bending type of support main part becomes circular resistance circle and is used for fixing ureteral department in the bladder, and the last card that can outwards extend of being provided with of support main part establishes the portion, and the card is established and is provided with a transition strip between portion and resistance circle. The utility model has simple structure, compact design and convenient use, the ureteral stent can be discharged after being degraded in vivo, thereby avoiding the damage to the ureter caused by secondary operation and relieving the pain of patients; the clamping part seat is clamped at an inlet of the ureter into the bladder wall, the fixing support cannot move towards the bladder, the problem that the discharge time of generated fragments from the renal pelvis is uncontrollable when the degradable ureter support is degraded in a pigtail loop renal pelvis suspension fixing mode is solved, and the transition strip arranged on the support main body effectively prevents the bladder urine from flowing back.

Description

Degradable ureter stent

Technical Field

The utility model relates to a degradable ureteral stent belongs to medical instrument technical field.

Background

The non-degradable ureteral stent which is generally used in clinic is a hollow long tube with one end or two ends bent into a pigtail ring shape, and has the function of keeping the ureter unobstructed. The ureteral stent usually enters from the orifice of the urinary bladder ureter, the position of the ureteral stent in the ureteral catheter is kept stable in a mode of hanging and fixing in the renal pelvis of a pigtail loop, and the ureteral stent needs to be pulled out through a secondary operation after being used. The extraction of the non-degradable ureteral stent increases the pain and economic burden of a patient, and risks causing damage to the ureter, thereby also leading to a concern about postoperative preventive protection of possible damage caused by ureter examination and treatment, and therefore, the degradable ureteral stent is urgently desired clinically.

However, the degradable ureteral stent adopting the fixing structure in the renal pelvis is retained in the renal pelvis for a long time after the degradation and the breakage of the pipe sections, most degradation products are discharged out of the body, but the discharge time is uncontrollable, adverse events are existed, the health of the kidney and the subsequent treatment of the ureter are easily affected, and in addition, the ureteral stent stays in the wall of the ureter through a hollow circular pipe, and bladder urine backflow is caused no matter whether the degradation is carried out or not.

Disclosure of Invention

The utility model aims at solving the problems and providing a degradable ureter bracket with simple structure and compact design.

The utility model adopts the following technical scheme: the support comprises a support main body, the upper end of the support main body is provided with an opening, the lower end of the support main body is bent to form a circular resistance ring and is used for being fixed at the ureteral orifice in the bladder, the support main body is provided with a clamping part extending outwards, the clamping part can be fixed at the junction of the pelvic part of the ureter and the wall part in the bladder, and a transition strip is arranged between the clamping part and the resistance ring.

Furthermore, the card setting part is an elastic card, and the number of the card is at least 1.

Further, the card is in a curled shape.

Furthermore, the transition strip is a C-shaped arc strip, a solid thin column with the diameter smaller than that of the main body tube of the bracket or a straight solid thin column with the diameter smaller than that of the main body tube of the bracket

The strip and the edge are provided with C-shaped arc strips with wave shapes.

Further, the length of the transition strip is 0.5-1.5 cm.

Furthermore, the clamping part is of an umbrella-shaped structure or other skeleton-shaped structures.

Further, the stent is made of biodegradable polymer.

Further, the card is arranged on the bracket main body at a position which is 1.5-2cm away from the highest point of the resistance ring.

Furthermore, the clamping piece can be unfolded to form any angle by taking a connecting point with the bracket main body as a fulcrum, the opening of the angle faces to the direction of the resistance ring, and the clamping piece can be clamped at the junction of the ureter basin and the inner part of the bladder wall after being unfolded.

Further, the opening at the upper end of the bracket main body is a horizontal opening or an inclined plane opening.

The utility model has the advantages that:

(1) the utility model discloses simple structure, the design is compact, and convenient to use adopts biodegradable polymer material to discharge after can accomplishing the degradation in vivo, has avoided the risk of secondary operation to the ureter harm, has alleviateed patient's misery.

(2) The utility model discloses a card is established a seat card and is got into the inside entrance of bladder wall from basin portion at the ureter, and fixed mode is simple firm, and the support is difficult for removing, has avoided adopting the pigtail circle to carry out the fixed mode that hangs in the renal pelvis, and fundamentally has solved the influence of support degradation product to the renal pelvis.

(3) Establishes the direct response of the stent discharging time and the degradation time of the stent material, and realizes the controllability of the stent discharging time in clinic.

(4) The arrangement of the transition strip on the main body of the bracket avoids the obstruction of the circular bracket tube to the closing function of the inner tube cavity of the ureter wall, and effectively solves the problem of bladder urine backflow.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic structural diagram of the present invention.

Reference numerals: the support comprises a support body 1, a clamping part 2, a transition strip 3 and a resistance ring 4.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, a degradable ureteral stent is made of biodegradable materials and comprises a stent main body 1 made of a hollow round tube, wherein the lower end of the stent main body 1 is bent to form a resistance ring 4 for fixing at a ureter orifice in a bladder, the upper end of the stent main body 1 is a horizontal opening, an elastic clamping sheet extending outwards is arranged at the middle part of the stent main body 1, and the clamping sheet is arranged on the stent main body 1 and at least comprises 1 clamping sheet; the root of the card is arranged on the position, 1.5-2cm away from the highest point of the resistance ring 4, on the stent main body 1, the card can be unfolded into any angle by taking a connecting point with the stent main body 1 as a fulcrum, the card can be seated and clamped at the junction of the ureter basin and the bladder wall after being unfolded, the card is in a long strip curl shape, the end part of the card is in a circular shape or other arbitrary shapes, the unfolding range of the card after entering the ureter basin is larger than the diameter of the inner part of the ureter wall, so that the stent can be stably placed without sliding into the bladder, the curl-shaped card can relieve the stimulation to the endoureter, the card is symmetrically and uniformly distributed on the stent main body, the transition strip 3 is arranged on the stent main body 1, the transition strip 3 comprises a C-shaped arc strip, the C-shaped arc strip is arranged between the resistance ring and the card, a section of the stent main body tube is reserved between the C-shaped arc strip and the card, and the length of the C-shaped arc strip is 0.5-1.5cm, the C-shaped arc strip can ensure that the ureteral stent is not influenced in the process of placement, and can also ensure the lumen closing function in the ureteral wall, thereby playing the role of preventing urine from flowing back to the ureter from the bladder, and a plurality of small ventilation holes are distributed on the stent main body.

The clamping part is arranged on the bracket main body in an umbrella-shaped structure in a surrounding way or other skeleton-shaped structures are arranged on the bracket main body in a net shape, and as shown in figure 2, the transition strip is a C-shaped pipe with a wave-shaped edge; as shown in fig. 3, the transition bar is a straight solid thin column.

Selecting a degradable biological material meeting the requirement, extruding a raw material pipe of the bracket according to the specification requirement, cutting the raw material pipe with the designed specification length as a main body of the bracket, bending the tail end of the main body of the bracket to form a resistance ring, inserting a punching pad wire into a straight pipe, marking a positioning point with the highest point of the resistance ring on the straight pipe, punching a card on the main body of the bracket by adopting a punching die according to the positioning point, processing the card to bend and upwarp the card to form a curled shape, punching to form a C-shaped transition arc strip, marking the scale position, finishing the processing technology, packaging and sterilizing to form a ureteral bracket product.

The using method comprises the following steps: selecting a degradable ureteral stent with proper degradation time and specification according to the clinical requirement on the implantation time of the ureteral stent and the ureteral examination result of a patient; the degradable ureteral stent is put into the way from the ureter opening of the bladder ureter, and pushed into the urethra, the bladder and the ureter wall along with the guide wire, scale marks are arranged on the stent main body and used for marking the entering length of the ureter, the scale prompt on the stent main body is noticed, when a card enters the basin part of the ureter, the pushing is stopped, the stent main body is pulled back, the stop is realized when the resistance is obviously felt, at the moment, the resistance ring at the lower end of the stent main body is required to be attached to the outside of the ureter opening, the guide wire is pulled out, and the placement of the ureteral stent is finished. The card is fully expanded in the process of pulling back, can sit and block at the junction of the interior of the ureter basin and the bladder wall, and therefore the ureter stent cannot slide down. After the preset degradation fracture time of the ureter stent material is reached, the card is degraded and fractured along with the stent main body, and the stent residue can directly enter the bladder from the ureter and then be discharged out of the body through the urethra, so that the requirement of waste discharge is met. According to different degradation times of the biodegradable polymer adopted by the stent, the time for the degradation products to be discharged out of a human body can be determined, so that an accurate treatment scheme can be clinically implemented.

Claims (9)

1. A degradable ureteral stent is characterized in that: including support main part (1), the upper end of support main part (1) is provided with the opening, the lower extreme bending of support main part (1) forms circular resistance circle (4) and is used for fixing at the bladder ureteral orifice of pipe, be provided with card portion of establishing (2) of outside extension on support main part (1), card portion of establishing (2) can be fixed in ureteral basin portion and the inside juncture of bladder wall, it is provided with a transition strip (3) to block between portion of establishing (2) and resistance circle (4).

2. The degradable ureteral stent of claim 1, wherein: the card is established the portion and is the elasticity card, and the card is at least 1.

3. The degradable ureteral stent of claim 2, wherein: the card is warped outwards and is in a curled shape.

4. The degradable ureteral stent of claim 2, wherein: the card can be unfolded to form any angle by taking a connecting point of the card and the bracket main body (1) as a fulcrum, the opening of the angle faces the direction of the resistance ring (4), and the card can be clamped at the junction of the ureter basin and the bladder wall after being unfolded.

5. The degradable ureteral stent of claim 1, wherein: the clamping part (2) is of an umbrella-shaped structure.

6. The degradable ureteral stent of claim 1, wherein: the transition strip (3) is a C-shaped arc strip, a solid thin column or a straight strip with the diameter smaller than that of the main pipe of the bracket, and a C-shaped arc strip with a waveform at the edge.

7. The degradable ureteral stent of claim 1, wherein: the length of the transition strip (3) is 0.5-1.5 cm.

8. The degradable ureteral stent of claim 1, wherein: the clamping part (2) is arranged on the support body (1) at a position which is 1.5-2cm away from the highest point of the resistance ring (4).

9. The degradable ureteral stent of claim 1, wherein: the opening at the upper end of the bracket main body (1) is a horizontal opening or an inclined plane opening.

Images