CN113663203B

CN113663203B - Ureteral stent of improvement

Info

Publication number: CN113663203B
Application number: CN202110990310.2A
Authority: CN
Inventors: 张子扬; 郑兴荣; 李芳柄; 李辰晨; 李雪影
Original assignee: Zhejiang Medical Technology Co ltd
Current assignee: Zhejiang Medical Technology Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2023-04-28
Anticipated expiration: 2040-01-17
Also published as: CN111249045B; CN113663203A; CN111249045A

Abstract

The invention provides an improved ureteral stent which can support a ureter and simultaneously avoid crowding the ureter, so that the comfort of a patient is remarkably improved; in addition, the gap that exists between this ureteral stent and the ureter can greatly improve drainage effect.

Description

Ureteral stent of improvement

Technical Field

The invention relates to a ureteral stent, in particular to an improved ureteral stent.

Background

The ureter is a tubular passage in the body that carries urine from the kidneys to the bladder; ureteral stents are used to facilitate drainage of urine from the kidney to the bladder in patients with ureteral obstruction or injury, or to protect the integrity of the ureter during various surgical procedures; existing ureteral stents are typically about 30cm long, hollow catheter-like devices made of polymers and placed inside the ureter with the distal portion in the kidney and the proximal portion in the bladder.

The existing ureteral stent covers the entire ureter, and the patient may feel uncomfortable. In addition, the ureteral stent has very effective drainage effect due to the ureteral occlusion.

Disclosure of Invention

The present invention aims to solve at least one of the above technical problems, and an object of the present invention is to provide an improved ureteral stent system, which prevents the ureter from being crowded while supporting the ureter, and significantly improves the comfort of a patient; in addition, the gap that exists between this ureteral stent and the ureter can greatly improve drainage effect.

In order to achieve the above object, the present invention provides an improved ureteral stent comprising:

the flexible barrel body extends in an axial direction, the flexible barrel body comprises a flexible thin wall and an air cavity which is defined by the flexible thin wall and extends in the axial direction, the flexible thin wall is provided with a plurality of drainage holes, and the flexible barrel body is provided with a proximal end and a distal end;

the movable rod is arranged to penetrate through the air cavity in an axially movable manner and is provided with a proximal end and a distal end, and the distal end of the movable rod is fixedly connected with the distal end of the flexible cylinder;

the stopping piece is arranged at the proximal end of the flexible barrel to prevent the proximal end of the flexible barrel from axially displacing;

the supporting elastic piece extends axially through the air cavity, the distal end of the supporting elastic piece is fixed with the distal end of the flexible cylinder or the distal end of the moving rod, and the proximal end of the supporting elastic piece is fixed with the proximal end of the flexible cylinder or the abutting piece; the axial reciprocating movement of the moving rod drives the supporting elastic piece to compress or release so as to drive the flexible cylinder to be in a stacking state or an unfolding state;

preferably, the ureteral stent further comprises a limiting mechanism, wherein the limiting mechanism has a tension state for preventing the proximal end and the distal end of the flexible cylinder from relative displacement and a release state for allowing the distal end of the flexible cylinder to move towards the proximal end of the flexible cylinder.

According to the invention, the flexible cylinder is firstly implanted into the ureter, and the rapid implantation can be realized due to the smaller radial size of the flexible cylinder in the implantation process; then through movable rod, elastic support spare, stop and stop gear's cooperation with be equipped with the flexible barrel compression of drainage hole and can last the state of keeping, realize supporting ureter's function and alleviate the pressure to ureter wall simultaneously, promote patient's comfort level, and the gap that exists can optimize drainage effect.

Preferably, the proximal end of the moving rod is detachably provided with a push-pull member for pushing the moving rod to axially reciprocate.

Preferably, the supporting elastic member is a compression spring sleeved on the movable rod.

Preferably, the abutment comprises an abutment disposed at the proximal end of the flexible barrel.

Preferably, the support further comprises a pushing tube partially penetrating through the air cavity, the moving rod is axially movably arranged in the pushing tube, an elastic pressing part is arranged on the moving rod, and the elastic pressing part is in a tension state stored in the pushing tube and a release state separated from the pushing tube and propped against the pushing tube.

Preferably, the elastic propping part is an elastic horn ring, the elastic horn ring is connected with the moving rod and is contracted in the pushing pipe in a tension state, and the pushing pipe is pulled to be far away from the moving rod so as to realize release and propping of the elastic horn ring.

Preferably, the push-pull member includes a locking portion capable of locking with the moving rod, and a pushing portion for driving the locking portion to move.

Preferably, a plurality of drainage holes are uniformly formed on the whole flexible thin wall body.

Preferably, the elastic pressing portion is disposed at the push tube front side opening section, and the elastic pressing portion is configured to be located at the rear side of the stopper when the flexible cylinder is converted into the stacked state.

Preferably, the moving rod penetrates through the distal end of the flexible cylinder body and is provided with a blocking cap, the blocking cap abuts against the outer wall of the distal end of the flexible cylinder body, and the distal end of the supporting elastic piece is fixedly connected with the blocking cap.

Another object of the present invention is to provide a method for placement of an improved ureteral stent system into a ureter, characterized in that the method comprises the steps of:

step 1): the ureteral stent enters a sheath, a flexible barrel in an expanded state extends out of the sheath, a stopping piece at the top end of the flexible barrel is propped against the sheath, a moving rod is pulled to enable the distal end of the flexible barrel to move linearly towards the proximal end of the flexible barrel, the flexible barrel is gradually compressed from the expanded state to a target stacked state, and a limiting mechanism is in a tension state;

step 2): and stopping the displacement of the moving rod and the flexible barrel, and releasing the limiting mechanism to enable the limiting mechanism to abut against the abutting piece, so that the flexible barrel is ensured to be kept in a stacked state, and implantation work is completed.

Through the sheath tube, the implantation operation of the ureteral stent can be completed; and the distal end of the sheath tube is propped against the propping piece, and when the moving rod drives the distal end of the flexible cylinder body to axially move, the sheath tube prevents the proximal end of the flexible cylinder body from displacing so as to promote the flexible cylinder body to be converted from the unfolding state to the stacking state.

Drawings

Fig. 1 is a schematic structural view of a ureteral stent system (flexible cylinder in an expanded state) provided by the present invention;

FIG. 2 is an enlarged schematic view of the portions a, b, c and d in FIG. 1;

FIG. 3 is a schematic view showing a state in which the flexible cylinder of the present invention is in a stacked state;

fig. 4 is a schematic diagram of a ureteral stent system according to the present invention in use.

Detailed Description

The invention or the technical scheme of the invention is further specifically described below through specific embodiments and with reference to the accompanying drawings;

in the description of the present invention, it should be understood that the terms "front," "rear," "head," "tail," "far," "near," "axial," and "radial" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for purposes of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise specified and defined, the terms "mounted" and "connected" are to be construed broadly, and may be, for example, mechanical or electrical, or may be internal to two elements in communication, or may be directly or indirectly connected through an intermediate medium, and the specific meaning of the terms may be understood by those skilled in the art according to circumstances.

Referring to fig. 1-3, an embodiment of the present invention provides an improved ureteral stent, comprising a flexible cylinder 5:

the flexible cylinder 5 extends axially, the flexible cylinder comprises a flexible thin wall and an axially extending air cavity defined by the flexible thin wall, the flexible thin wall is provided with a plurality of drainage holes, and the flexible cylinder is provided with a proximal end 52 and a distal end 51; referring to fig. 1, the flexible cylinder 5 is in an expanded state, referring to fig. 3, the flexible cylinder 5 is in a stacked state, when in the expanded state, the flexible cylinder 5 is in a strip shape, the radial dimension of the flexible cylinder 5 is smaller and is not enough to support the ureter, the flexible cylinder is axially compressed, due to the existence of the flexible thin-wall drainage hole, the flexible material of the flexible cylinder is caused to be converted into the stacked state from the expanded state, at the moment, the radial dimension is increased to support the ureter, and a gap exists between a thread generated in the stacking process and the inner wall of the ureter, so that the defect that the existing ureter bracket completely covers the ureter is overcome, the comfort of a patient is greatly improved, and meanwhile, the existing gap can greatly improve the urine drainage effect.

The flexible barrel is provided with a plurality of drainage holes, and the drainage holes have the effect of helping the flexible barrel to be converted into a folding state from an unfolding state while achieving the drainage effect.

In this embodiment, the flexible cylinder is covered with drainage holes.

Based on this, the present invention drives the flexible cylinder body to be converted from the unfolded state to the stacked state after implantation into the body by the above-described driving compression mechanism, and is finally held in the ureter in the stacked state.

The driving compression mechanism provided by the embodiment of the invention comprises a movable rod 1, a stopping piece 3, a supporting elastic piece 2 and a limiting mechanism;

the movable rod 1 is arranged to penetrate through the air cavity in an axially movable manner, the movable rod 1 is provided with a proximal end and a distal end, and the distal end of the movable rod 1 is fixedly connected with the distal end of the flexible cylinder; the stopping piece is arranged at the proximal end of the flexible barrel to prevent the proximal end of the flexible barrel from axially displacing; therefore, when the moving rod axially displaces to the rear side, the moving rod can drive the distal end of the flexible cylinder body to move towards the proximal end of the moving rod, and the abutting piece abuts against the sheath tube or other channels due to the existence of the abutting piece, so that the proximal end of the flexible cylinder body does not displace, and the flexible cylinder body is compressed into a stacked shape through the extrusion of the distal end of the flexible cylinder body towards the proximal end of the flexible cylinder body.

The flexible cylinder 5 needs to be kept in its deployed state before implantation and in its stacked state after implantation, i.e. it needs to be switched between the stacked state and the deployed state; the support provided by the invention further comprises a supporting elastic piece 2 which extends axially through the air cavity, wherein the distal end of the supporting elastic piece 2 is fixed with the distal end of the flexible cylinder 5 or the distal end of the moving rod 1, and the proximal end of the supporting elastic piece is fixed with the proximal end of the flexible cylinder 5 or the abutting piece; the axial reciprocating movement of the moving rod 1 drives the supporting elastic piece to compress or release so as to drive the flexible cylinder to be in a stacking state or an unfolding state; or if the compression degree of the stacking state needs to be adjusted, the compression degree of the movable rod and the supporting elastic piece can be adjusted in real time so as to adapt to ureters with different sizes.

In order to facilitate the compression of the supporting elastic member 2 after the implantation is completed to ensure the stacking state of the flexible cylinder, the stent provided by the present invention further comprises a limiting mechanism, referring to fig. 1 and 3, which has a stressed state for preventing the relative displacement of the proximal end and the distal end of the flexible cylinder and a relaxed state for allowing the distal end of the flexible cylinder to move toward the proximal end thereof.

According to the invention, the flexible cylinder 5 is firstly implanted into the ureter, and the rapid implantation can be realized due to the smaller radial size of the flexible cylinder 5 in the implantation process; then through the cooperation of movable rod 1, elastic support piece 2, stopping piece 3 and stop gear with be equipped with the flexible barrel 5 compression of drainage hole and can last the state of keeping stacked, realize supporting ureter's function and alleviate the pressure to the ureter wall simultaneously, promote patient's comfort level, and the gap that exists can optimize drainage effect.

In some embodiments, the proximal end of the moving rod 1 is detachably provided with a push-pull member 7 for pushing the moving rod 1 to axially reciprocate; the push-pull piece has more structural forms, for example, a connecting rod is adopted to pull a moving rod to axially displace; as a preferred embodiment, the push-pull member includes a clamping portion capable of being clamped with the moving rod and a pushing portion for driving the clamping portion to move; in this embodiment, referring to fig. 1 and 2, the moving rod is provided with a clamping groove 13, the clamping portion is an elastic clip 4 capable of being elastically clamped in the clamping groove, and the pushing portion is a push-pull rod disposed at the rear side of the elastic clip; therefore, when the movable rod is required to be pulled to displace, the elastic clamp 7 can be clamped on the clamping groove, and then the push-pull rod is pulled to realize the axial displacement of the movable rod.

In some embodiments, the supporting elastic member 2 is a compression spring set on the movable rod 1, and the compression and release of the compression spring allow the flexible cylinder 5 to be unfolded or stacked, or the stacking state of the compression spring is adjusted.

In this embodiment, referring to fig. 1, the abutment 3 includes an abutment 3 disposed at a proximal end of the flexible barrel, and when the distal end of the flexible barrel moves toward the proximal end, the abutment of the distal end can abut against the head end of the sheath, so that the axial displacement of the proximal end of the flexible barrel is limited by the abutment 3; specifically, the abutment 3 may be in the form of a fixing cap;

in order to maintain the stacking state of the flexible cylinder, the invention preferably adopts the following limit structure; the bracket also comprises a pushing tube 8 which partially penetrates through the air cavity, the moving rod 1 is axially movably arranged in the pushing tube 8, the moving rod 1 is provided with an elastic pressing part 4, and the elastic pressing part is in a tension state accommodated in the pushing tube and a release state which is separated from the pushing tube and is propped against the stopping point; the elastic pressing part is contracted in the pushing pipe before the flexible barrel completes the compression stacking work, after the final stacking work is ensured, the elastic pressing part is pressed against the pressing part, and the compression or expansion deformation of the flexible barrel 5 is limited by the fixation of the moving rod 1 and the distal end of the flexible barrel 5 and the fixation of the moving rod 1 and the elastic pressing part 4, so that the stacking state is maintained, and finally the implantation is completed; specifically, referring to fig. 2 and 3, the elastic pressing portion 4 is an elastic horn ring, the elastic horn ring 4 is connected with the moving rod 1 and is contracted in the pushing tube in a tension state, and the pushing tube is pulled to be far away from the moving rod so as to release the elastic horn ring from the pushing tube 8 and press against the pressing portion 3; optionally, the moving rod is provided with a clamping groove 12 for clamping the elastic horn ring 4.

When the ureteral stent is implanted, the moving rod and the pushing tube are pulled simultaneously, so that the elastic horn ring can shrink in the pushing tube due to synchronous movement until the pushing tube is pulled to the back of the abutment, and the stacking degree of the flexible cylinder needs to meet the function of local support; then, the movable rod is stationary and continuously pulls the pushing tube, and the elastic horn ring is ejected out of the pushing tube by the relative movement of the movable rod and the pushing tube, so that the elastic horn ring is propped against the propping point to ensure that the flexible cylinder body is stably in a stacked state.

It will be appreciated that the resilient horn ring is located at the open section of the head end of the push tube and the axial spacing between the resilient horn ring and the abutment is adapted to the compressed height differential of the distal end of the flexible barrel to ensure that the push tube can be located on the rear side of the abutment when the flexible barrel is compressed into the desired stacked condition,

in the embodiment, a plurality of drainage holes are uniformly formed on the whole flexible thin-wall body; the plurality of drainage holes can enable the flexible cylinder body to timely release air pressure when being compressed so as to allow the flexible cylinder body to be converted into a stacked state.

Optionally, referring to fig. 2, the moving rod 1 is provided with a blocking cap 11 penetrating through the distal end of the flexible cylinder 5, the blocking cap 11 abuts against the outer wall of the distal end of the flexible cylinder 1, the distal end 21 of the compression spring 2 is fixedly connected with the blocking cap 11, and the proximal end 22 is fixedly connected with the abutment stop;

in addition, the flexible cylinder body is a soft plastic film piece.

It is another object of the present invention to provide an improved ureteral stent system, the system comprising:

the above-described improved ureteral stent;

the improved ureteral stent can complete implantation work through the sheath 6, and the distal end of the sheath abuts against the abutting piece.

Illustratively, referring to fig. 4, the present invention provides the above-mentioned ureteral stent system implantation procedure:

step 1): the ureteral stent enters a central channel of a sheath tube 6, a flexible barrel body in an unfolding state stretches out of the sheath tube, a stop 3 at the top end of the flexible barrel body 5 is propped against the sheath tube 6, a pushing rod and the pushing tube 6 are synchronously pulled at the same speed, the pushing rod drives the moving rod to move linearly to the rear side through an elastic clamp 7, a blocking cap 11 drives the distal end of the flexible barrel body 5 to approach to the proximal end of the flexible barrel body, and the flexible barrel body is gradually compressed from the unfolding state to a target stacking state; at the same time, when the head end of the pushing tube 6 is located just above the abutment 3,

step 2): the pushing tube 8 is pulled continuously, and the moving rod and the flexible cylinder body are stationary at the moment, so that the elastic horn ring which is fixed on the moving rod and contracted on the pushing tube 8 is separated from the pushing tube and props against the stop, and the implantation work is completed.

In the description of the present specification, a description referring to the terms "one embodiment," "some embodiments," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An improved ureteral stent, the stent comprising:

the flexible barrel (5) extends axially, the flexible barrel (5) comprises a flexible thin wall and an axially extending air cavity defined by the flexible thin wall, the flexible thin wall is provided with a plurality of drainage holes, and the flexible barrel is provided with a proximal end (52) and a distal end (51);

the movable rod (1) can axially movably penetrate through the air cavity, the movable rod (1) is provided with a proximal end and a distal end, and the distal end of the movable rod (1) is fixedly connected with the distal end of the flexible cylinder (5);

a stopper (3) provided at the proximal end of the flexible cylinder (5) to prevent the proximal end of the flexible cylinder (5) from being axially displaced;

the supporting elastic piece (2) extends axially through the air cavity, the distal end of the supporting elastic piece (2) is fixed with the distal end of the flexible barrel or the distal end of the moving rod, and the proximal end of the supporting elastic piece is fixed with the proximal end of the flexible barrel or the abutting piece; the axial reciprocating movement of the moving rod (1) drives the supporting elastic piece to compress or release so as to drive the flexible cylinder body to be in a stacking state or an unfolding state;

the limiting mechanism is provided with a tension state for preventing the proximal end and the distal end of the flexible barrel (5) from relative displacement and a release state for allowing the distal end of the flexible barrel (5) to move towards the proximal end of the flexible barrel.

2. The improved ureteral stent according to claim 1, characterized in that the limiting mechanism comprises a push tube (8) arranged partially penetrating the air cavity, the moving rod (1) is axially movably arranged in the push tube (8), the moving rod (1) is provided with an elastic pressing part (4), and the elastic pressing part (4) is in a tension state accommodated in the push tube and a release state abutting against the stopping piece (3) from the push tube.

3. The improved ureteral stent according to claim 1, characterized in that the proximal end of the moving rod is provided in a removable manner with a push-pull member for pushing the moving rod to perform an axial reciprocal movement.

4. The improved ureteral stent according to claim 1, characterized in that the supporting elastic element is a compression spring that is sleeved on the moving rod.

5. The improved ureteral stent according to claim 1, characterized in that the abutment (3) comprises an abutment provided at the proximal end of the flexible cylinder.

6. The improved ureteral stent according to claim 2, characterized in that the elastic pressing part is an elastic horn ring (4), the elastic horn ring (4) is connected with the moving rod (1) and is contracted in the pushing tube (8) in a tension state, and the pushing tube is pulled to be far away from the moving rod so as to realize the release of the elastic horn ring and the pressing part.

7. The improved ureteral stent according to claim 3, characterized in that the push-pull element comprises a clamping portion (7) that can be clamped with the moving rod and a pushing portion for driving the movement of the clamping portion.

8. The improved ureteral stent according to claim 6, characterized in that the elastic abutment is provided at the push tube front side opening section, and the elastic abutment is configured to be located at the rear side of the abutment when the flexible cylinder is converted into the stacked state.

9. The improved ureteral stent according to claim 1, characterized in that the distal end of the moving rod (1) penetrating the flexible cylinder is provided with a blocking cap (11), the blocking cap (11) is abutted against the outer wall of the distal end of the flexible cylinder (5), and the distal end of the supporting elastic member is fixedly connected with the blocking cap.

10. An improved ureteral stent system, characterized in that the system comprises an improved ureteral stent according to any of claims 1-9.