CN113663203A

CN113663203A - Improved ureteral stent

Info

Publication number: CN113663203A
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: 2021-11-19
Anticipated expiration: 2040-01-17
Also published as: CN111249045B; CN111249045A; CN113663203B

Abstract

The invention provides an improved ureteral stent which can support a ureter and simultaneously avoid the ureter from being crowded, thereby obviously improving the comfort of a patient; in addition, the gap that exists between this ureteral stent and the ureter can greatly improve drainage effect.

Description

Improved ureteral stent

Technical Field

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

Background

Ureters are tubular passages within the body that transport 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 in a variety of surgical procedures; existing ureteral stents are typically about 30cm long, hollow catheter-like devices made of polymers and placed within the ureter with the distal portion in the kidney and the proximal portion in the bladder.

The existing ureteral stent covers the whole ureter, and a patient feels uncomfortable. In addition, the ureteral stent has very effective drainage effect because the ureter is fully filled.

Disclosure of Invention

The present invention is designed to solve at least one of the above technical problems, and an object of the present invention is to provide an improved ureteral stent which, while serving to support the ureter, avoids the ureter from being crowded, and significantly improves the comfort of the 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 cylinder body extends axially, the flexible cylinder body 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 body is provided with a near end and a far end;

the movable rod penetrates through the air cavity in an axially movable mode and is provided with a near end and a far end, and the far end of the movable rod is fixedly connected with the far end of the flexible cylinder body;

the abutting piece is arranged at the proximal end of the flexible cylinder body so as to prevent the proximal end of the flexible cylinder body from axially displacing;

the support elastic part penetrates through the air cavity and extends axially, the far end of the support elastic part is fixed with the far end of the flexible cylinder body or the far end of the movable rod, and the near end of the support elastic part is fixed with the near end of the flexible cylinder body or the abutting part; the axial reciprocating movement of the movable rod drives the supporting elastic part to compress or release so as to drive the flexible cylinder body to be in a stacked state or an unfolded state;

preferably, the ureteral stent further comprises a limiting mechanism, wherein the limiting mechanism has a tense state for preventing the proximal end and the distal end of the flexible cylinder from relative displacement and a relaxed 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 body is implanted into the ureter, and the flexible cylinder body can be implanted quickly due to the small radial size in the implantation process; then through the cooperation of carriage release lever, elastic support piece, stopping piece and stop gear with the flexible barrel compression that the drainage hole will be equipped with and the state of piling up that can last to keep, realize the function of supporting ureter and alleviate the pressure to the ureter wall simultaneously, promote patient's comfort level, and the gap that exists can optimize the drainage effect.

Preferably, the proximal end of the movable rod is detachably provided with a push-pull member for pushing the movable rod to perform axial reciprocating movement.

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

Preferably, the stop member comprises a stop arranged at the proximal end of the flexible barrel.

Preferably, the bracket further comprises a pushing pipe partially penetrating through the air cavity, the movable rod is axially movably arranged in the pushing pipe, and the movable rod is provided with an elastic pressing part which has a tension state of being accommodated in the pushing pipe and a release state of being released from the pushing pipe and abutting against the pushing pipe.

Preferably, the elastic pressing portion is an elastic horn ring, the elastic horn ring is connected with the moving rod and is contracted in the pushing pipe in a tensed state, and the pushing pipe is pulled to be far away from the moving rod so as to release and stop the elastic horn ring to be pressed against.

Preferably, the push-pull member comprises a clamping portion capable of being clamped with the moving rod and a pushing portion for driving the clamping portion to move.

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

Preferably, the elastic pressing part is arranged at the front opening section of the pushing pipe, and the elastic pressing part is configured to be positioned at the rear side of the stopping part when the flexible cylinder body is converted into the stacking state.

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

It is another object of the present invention to provide a method for placing an improved ureteral stent system into a ureter, wherein the method comprises the steps of:

step 1): the ureter bracket enters a sheath tube, the flexible cylinder body in the unfolded state extends out of the sheath tube, a stop part at the top end of the flexible cylinder body abuts against the sheath tube, the movable rod is pulled to enable the distal end of the flexible cylinder body to move linearly towards the proximal end of the flexible cylinder body, the flexible cylinder body is gradually compressed from the unfolded state to a target stacking state, and the limiting mechanism is in a tense state;

step 2): and stopping the displacement of the movable rod and the flexible cylinder, and releasing the limiting mechanism to enable the limiting mechanism to be abutted against the abutting part, so that the flexible cylinder is kept in a stacked state, and the implantation work is completed.

The implantation operation of the ureteral stent can be completed through the sheath tube; and the distal end of the sheath tube is abutted against the abutting part, 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 (with a flexible cylinder in a deployed state) provided by the invention;

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

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

fig. 4 is a schematic view of a ureteral stent system provided by the invention in a using process.

Detailed Description

The invention or the technical scheme of the invention is further specifically described by the specific embodiment and the accompanying drawings of the specification;

in the description of the present invention, it is to be understood that the terms "front", "back", "head", "tail", "distal", "proximal", "axial", and "radial", etc., indicate orientations and positional relationships based on those illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or component must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered limiting of the present invention.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted" and "connected" should be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1-3, embodiments of the present invention provide an improved ureteral stent, which includes a flexible barrel 5:

the flexible cylinder body 5 extends axially and 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 body is provided with a near end 52 and a far end 51; referring to fig. 1, the flexible cylinder 5 is in an unfolded state, referring to fig. 3, the flexible cylinder 5 is in a stacked state, when the flexible cylinder 5 is in the unfolded state, the flexible cylinder 5 is in a long strip shape, the radial size of the flexible cylinder is small and is not enough to support a ureter, and the flexible cylinder is compressed axially.

The flexible barrel be equipped with a plurality of drainage holes, the drainage hole still have the effect that helps flexible barrel convert fold condition from the state of expanding when reaching the drainage effect.

In this embodiment, the flexible cylinder body on be covered with the drainage hole.

Based on this, the invention drives the flexible cylinder body to be converted from the unfolding state to the stacking state after being implanted into the body through the above driving and compressing mechanism, and finally to be kept in the ureter in the stacking state.

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

the movable rod 1 can axially movably penetrate through the air cavity, the movable rod 1 is provided with a near end and a far end, and the far end of the movable rod 1 is fixedly connected with the far end of the flexible cylinder body; the stop member is arranged at the near end of the flexible cylinder body to stop the near end of the flexible cylinder body from axial displacement; so, when the movable rod takes place axial displacement to the rear side, it can drive the distal end of flexible barrel and move towards its near-end, owing to the existence of backstop piece, backstop piece and sheath pipe or other passageways counterbalance, so, the near-end of flexible barrel does not take place the displacement, compresses into the pile form through the extrusion of flexible barrel distal end towards its near-end.

The flexible cylinder 5 needs to maintain its expanded state before implantation and also needs to maintain its stacked state after implantation, i.e. it needs to be switched between the stacked state and the expanded state; the support provided by the invention also comprises a supporting elastic part 2 which penetrates through the air cavity and is arranged in an axially extending manner, the far end of the supporting elastic part 2 is fixed with the far end of the flexible cylinder body 5 or the far end of the movable rod 1, and the near end of the supporting elastic part is fixed with the near end of the flexible cylinder body 5 or the abutting part; the axial reciprocating movement of the movable rod 1 drives the supporting elastic part to compress or release so as to drive the flexible cylinder body to be in a stacked state or an unfolded 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 make the supporting elastic member 2 compressed to ensure the stacking state of the flexible cylinders after the implantation is completed, the stent provided by the invention further comprises a limiting mechanism, please refer to fig. 1 and 3, wherein the limiting mechanism has a tense state for preventing the relative displacement between the proximal end and the distal end of the flexible cylinders and a relaxed state for allowing the distal end of the flexible cylinders to move towards the proximal end thereof.

According to the invention, the flexible cylinder 5 is implanted into the ureter, and the flexible cylinder 5 can be implanted quickly due to the small radial size in the implantation process; then through the cooperation of carriage release lever 1, elastic support piece 2, stop 3 and stop mechanism will be equipped with the flexible barrel 5 compression of drainage hole and can last the state of piling up that keeps, realize supporting the function of ureter and alleviate the pressure to the ureter wall simultaneously, promote patient's comfort level, and the drainage effect can be optimized in the gap that exists.

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 perform axial reciprocating movement; the push-pull piece has more structural forms, for example, a connecting rod is adopted to pull the movable rod to generate axial displacement; 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, please refer to fig. 1 and 2, a clamping groove 13 is formed on the moving rod, the clamping portion is an elastic clamp 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 clamp; therefore, when the movable rod needs to be pulled to move, 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 set of compression springs disposed on the moving rod 1, and the compression and release of the compression springs allow the flexible cylinder 5 to be unfolded or stacked or adjust the stacking state thereof.

In the present embodiment, please refer to fig. 1, the stopping member includes a stopping part 3 disposed at the proximal end of the flexible cylinder, and when the distal end of the flexible cylinder moves toward the proximal end, the stopping part at the distal end can abut against the head end of the sheath, so that the stopping part 3 limits the axial displacement of the proximal end of the flexible cylinder; specifically, the stop 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 limiting structure; the support also comprises a pushing pipe 8 partially penetrating through the air cavity, the movable rod 1 is axially movably arranged in the pushing pipe 8, and the movable rod 1 is provided with an elastic pressing part 4 which has a tension state of being accommodated in the pushing pipe and a release state of being separated from the pushing pipe and abutting against the pushing pipe; before the flexible cylinder body finishes the compression stacking work, the elastic pressing part is contracted in the push pipe, after the final stacking work is finished, the elastic pressing part presses against the pressing part, the compression or expansion deformation of the flexible cylinder body 5 is limited by the fixation of the movable rod 1 and the far end of the flexible cylinder body 5 and the fixation of the movable rod 1 and the elastic pressing part 4, the stacking state is kept, and the implantation is finished finally; specifically, referring to fig. 2 and 3, the elastic pressing portion 4 is an elastic horn ring, the elastic horn ring 4 is connected to the moving rod 1 and is contracted in the pushing pipe when in a tense state, and the pushing pipe is pulled to be away from the moving rod, so that the elastic horn ring is released from the pushing pipe 8 and is pressed against the stopper 3; optionally, the movable rod is provided with a clamping groove 12 for clamping the elastic horn ring 4.

According to the limiting mechanism, when the ureteral stent is implanted, the movable rod and the pushing tube are pulled simultaneously, due to synchronous movement, the elastic horn ring can be contracted in the pushing tube until the pushing tube is pulled to the rear of the resisting top, and at the moment, the stacking degree of the flexible cylinder body needs to meet the effect of local support; then the movable rod is static, the pushing pipe is continuously pulled, the elastic horn ring can be popped out from the pushing pipe by the relative movement of the movable rod and the pushing pipe, and therefore the elastic horn ring is enabled to be propped against the stopping part to ensure that the flexible cylinder body is stably in a stacking state.

It can be understood that the elastic horn ring is arranged at the opening section of the end of the pushing tube, and the axial distance between the elastic horn ring and the abutting part is matched with the compression height difference of the far end of the flexible cylinder body, so as to ensure that the pushing tube can be positioned at the rear side of the abutting part when the flexible cylinder body is compressed into an ideal stacking state,

in this embodiment, a plurality of drainage holes are uniformly arranged on the whole body of the flexible thin wall; the plurality of drainage holes can be used for timely releasing air pressure when the flexible cylinder body is 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 pressure spring 2 is fixedly connected with the blocking cap 11, and the proximal end 22 is fixedly connected with the abutment;

in addition, the flexible cylinder 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 improved ureteral stent described above;

the improved ureteral stent can complete implantation work through the sheath 6, and the distal end of the sheath is abutted against the stop piece.

Exemplarily, referring to fig. 4, the present invention provides a working process of implanting the ureteral stent in the ureteral stent system, wherein:

step 1): the ureteral stent enters a central channel of a sheath tube 6, a flexible cylinder in an unfolded state extends out of the sheath tube, a stop 3 at the top end of the flexible cylinder 5 abuts against the sheath tube 6, a push rod and a push tube 6 are synchronously pulled at the same speed, the push rod drives a moving rod to linearly move towards the rear side through an elastic clamp 7, a blocking cap 11 drives the distal end of the flexible cylinder 5 to approach towards the proximal end of the flexible cylinder, and the flexible cylinder is gradually compressed from the unfolded state to a target stacking state; meanwhile, when the head end of the pushing pipe 6 is just above the resisting top 3,

step 2): and continuously pulling the pushing pipe 8, wherein the movable rod and the flexible cylinder are static at the moment, and the elastic horn ring which is fixed on the movable rod and is contracted on the pushing pipe 8 is separated from the pushing pipe and is propped against the stop, so that the implantation work is completed.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An improved ureteral stent, characterized in that it comprises:

the flexible cylinder (5) extends axially, the flexible cylinder (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 cylinder is provided with a near end (52) and a far end (51);

the movable rod (1) penetrates through the air cavity in an axially movable mode, the movable rod (1) is provided with a near end and a far end, and the far end of the movable rod (1) is fixedly connected with the far end of the flexible cylinder body (5);

the abutting piece (3) is arranged at the near end of the flexible cylinder body (5) to prevent the near end of the flexible cylinder body (5) from axially displacing;

the support elastic part (2) penetrates through the air cavity and extends axially, the far end of the support elastic part (2) is fixed with the far end of the flexible cylinder body or the far end of the movable rod, and the near end of the support elastic part is fixed with the near end of the flexible cylinder body or the abutting part; the axial reciprocating movement of the movable rod (1) drives the supporting elastic piece to compress or release so as to drive the flexible cylinder body to be in a stacked state or an unfolded state.

2. The improved ureteral stent according to claim 1, wherein said ureteral stent further comprises a stop mechanism, said stop mechanism having a stressed state preventing relative proximal and distal displacement of the flexible cylinder (5) and a relaxed state allowing the distal end of the flexible cylinder (5) to move towards its proximal end; preferably, the device comprises a pushing pipe (8) partially penetrating through the air cavity, the moving rod (1) is axially movably arranged in the pushing pipe (8), an elastic pressing part (4) is arranged on the moving rod (1), and the elastic pressing part (4) has a tension state stored in the pushing pipe and a release state which is separated from the pushing pipe and is pressed against the stopping part (3).

3. The improved ureteral stent of claim 1, wherein the proximal end of the movable rod is detachably provided with a push-pull member for pushing the movable rod to perform axial reciprocating movement.

4. The improved ureteral stent of claim 1, wherein the supporting resilient member is a set of compression springs disposed on the movable shaft.

5. The improved ureteral stent according to claim 1, wherein said abutment (3) comprises an abutment disposed at the proximal end of the flexible shaft.

6. The improved ureteral stent according to claim 2, wherein the elastic pressing part is an elastic flared ring (4), the elastic flared ring (4) is connected with the movable rod (1) and is contracted in the pushing tube (8) when in a tensed state, and the pushing tube is pulled away from the movable rod so as to release the elastic flared ring and press against the stopping part.

7. The improved ureteral stent according to claim 6, wherein the push-pull member comprises a clamping portion (7) which can be clamped with the movable rod and a pushing portion for driving the clamping portion to move.

8. The improved ureteral stent of claim 6, wherein the elastic pressing part is arranged at the front opening section of the pushing tube, and the elastic pressing part is configured to be positioned at the rear side of the pressing part when the flexible cylinder body is converted into the stacking state.

9. The improved ureteral stent according to claim 1, wherein the moving rod (2) is provided with a blocking cap (11) penetrating through the distal end of the flexible cylinder, the blocking cap (11) abuts against the outer wall of the distal end of the flexible cylinder (1), and the distal end of the supporting elastic element is fixedly connected with the blocking cap.

10. An improved ureteral stent system, characterized in that it comprises:

the improved ureteral stent of any of claims 1 to 9.