CN109107022B

CN109107022B - Stenosis dilating catheter

Info

Publication number: CN109107022B
Application number: CN201810869252.6A
Authority: CN
Inventors: 马浴东; 汤惠涵; 李文婷; 马才; 丛慧
Original assignee: Shandong Weigao Group Medical Polymer Co Ltd
Current assignee: Shandong Weigao Group Medical Polymer Co Ltd
Priority date: 2018-08-02
Filing date: 2018-08-02
Publication date: 2024-04-16
Anticipated expiration: 2038-08-02
Also published as: CN109107022A

Abstract

The invention provides a narrow dilating catheter, which comprises a catheter and a dilating guider, wherein one end of the catheter is provided with a catheter hole, the catheter is sleeved outside the dilating guider, the dilating guider comprises a guider main body, a dilating body, a guider seat and a sliding sleeve, the guider main body sequentially comprises a guiding part, a dilating body and a guiding core rod, the sliding sleeve is sleeved on the guiding core rod in a sliding manner, the guiding core rod is connected with the guider seat, the dilating body is arranged on the dilating body, the dilating body comprises at least 3 groups of dilating frameworks, the dilating frameworks comprise a first dilating strip and a second dilating strip, one end of the first dilating strip is hinged with the guiding part, one end of the second dilating strip is hinged with the middle part of the first dilating strip, the other end of the second dilating strip is hinged with the end of the sliding sleeve, and the length of the guiding core rod is not less than the length of the catheter. The catheter has the beneficial effects that due to the adoption of the technical scheme, a new mode is provided for the catheterization of the catheter, the catheterization resistance is small, and the pain of a patient is small.

Description

Stenosis dilating catheter

Technical Field

The invention belongs to the technical field of medical appliances, and particularly relates to a catheter dilation guide instrument.

Background

As a common clinical medical instrument, the catheter is placed into a human body through the urethra to drain urine from the bladder to the outside, and has the main effects of accurately recording urine volume, facilitating drainage, flushing and the like, and plays an important role in clinic.

The catheter material mainly comprises silica gel, rubber, EVA, PVC, etc., and the head end and catheter are soft. However, some patients have larger resistance in the urethra due to the conditions of urethral stricture, prostatic hyperplasia, canceration, bladder neck sclerosis and the like, so that the difficulty of tube placement is greatly increased. The existing clinical urethral catheterization is usually carried out by fixing the external urethral orifice with one hand after disinfecting the external urethral orifice and surrounding tissues, directly holding the catheter with the other hand or with forceps and the like, inserting the catheter from the external urethral orifice, and when the catheter faces the bending resistance and the narrow condition, the catheter needs to be more forcefully placed in the patient, so that huge pain is brought to the patient, the damage to the urethral mucosa is caused, the damage to the urinary tract structure is caused, and the risk of urethral infection is increased.

The following problems exist in the existing clinical catheter implantation process: when the top end of the catheter head advances to the urethral stricture, external force is required to be increased for pushing, the shearing action can be generated between the top end of the head and the urethral canal at the stricture, even though the urethral canal passes through the stricture, the inner membrane of the urethral canal is also severely contused and provides conditions for microorganism infection, the external surface of the catheter is smeared with lubricating oil and the like, and the effect is very little when the urethral canal is correspondingly narrowed.

The invention of application number 2009200275009 discloses an expansion guide catheter, which comprises an expansion guide and a catheter, wherein the expansion guide is arranged in the catheter, the expansion guide is firstly inserted into the catheter to ensure that the catheter has certain rigidity, and the expansion guide is then extracted from the catheter after the catheter is inserted into a bladder.

However, even in the presence of the dilation introducer, the problems encountered with the catheter cannulation described above are only alleviated to a limited extent and do not fundamentally reduce catheter cannula resistance.

Disclosure of Invention

The invention aims to provide a catheter with an expanding introducer, and particularly solves the problem of high resistance at the top of the catheter during catheterization.

The technical scheme of the invention is as follows:

the utility model provides a stenosis expansion catheter, includes pipe and expansion director, the one end of pipe is equipped with the catheterization hole, and the pipe sleeve is outside the expansion director, the expansion director includes guide main part, expansion body, guide seat and slip cap, the guide main part includes guide part, expansion body and guide core bar in proper order, and slip cap is in the guide core bar, and the guide core bar links to each other with the guide seat, the expansion body sets up in the expansion body, the expansion body includes not less than 3 group expansion skeleton, the expansion skeleton includes first expansion strip and second expansion strip, and the one end and the guide part of first expansion strip are articulated, and the one end and the middle part of first expansion strip of second expansion strip are articulated, and the other end and the slip cap's of second expansion strip are articulated, the length of guide core bar is not less than the length of pipe.

When the catheter is used, the expansion guide is inserted into the catheter, the guide part and the expansion body part of the expansion guide extend out from the urethral catheterization hole at the front end of the catheter, an umbrella-shaped expansion device is arranged at the front part of the guide main body, the expansion device is started through a sliding sleeve sleeved outside the guide core rod, an operator slides the sliding sleeve forwards relative to the guide core rod, the sliding sleeve extrudes the expansion body positioned at the expansion body part along the axial direction, the second expansion strips of the expansion body displace under the driving of the sliding sleeve, and the second expansion strips drive the first expansion strips to enable a plurality of groups of first expansion strips to expand around the guide main body and support the urethral wall, so that a path is dredged for the advancing of the urethral catheter outside the expansion guide.

The expansion body is provided with at least 1 track groove parallel to the axis of the expansion guide, and the inner side of the end part of the sliding sleeve connected with the second expansion strip is provided with a bulge matched with the track groove.

Optionally, at least 1 track groove parallel to the axis of the expansion guide is arranged on the inner side of the end part of the sliding sleeve connected with the second expansion strip, and the expansion body part is provided with a protrusion matched with the track groove.

The sliding sleeve and the guide body are of elongated structures, and when the sliding sleeve slides relatively, namely, when the sliding sleeve extrudes the expansion body, the sliding sleeve can possibly rotate circumferentially, and the expansion body can be possibly driven to rotate circumferentially, so that the expansion body cannot be expanded into an ideal shape. Thus, the present invention provides a relative track between the expansion body and the end of the sliding sheath that prevents rotation of the sliding sheath relative to the expansion guide. The opposite track comprises a track groove and a bulge, wherein the track groove can be arranged on the expansion body part and also can be arranged on the sliding sleeve, and the bulge is correspondingly arranged on the sliding sleeve or the expansion body part.

The urine drainage device is characterized in that a urine drainage cavity is arranged in the catheter, one end of the urine drainage cavity is communicated with the urethral catheterization hole, the other end of the urine drainage cavity is communicated with a port of the catheter at one end far away from the urethral catheterization hole, and a diaphragm for blocking urine is arranged on the inner wall of one end of the urine drainage cavity far away from the urethral catheterization hole. The side wall of the catheter, which is close to one side of the urethral catheterization hole, is provided with a urine observation window.

Optionally, the size of diaphragm cooperatees with the size of urine drainage chamber, the diaphragm middle part is equipped with the round hole that cooperatees with main part external diameter.

Optionally, the septum is a valve of no less than 2 petals.

Because of functional requirements, a plurality of channels which are respectively used for catheterization, air intake, medicine intake and other functions are usually arranged in the catheter, and in the application, the expansion guide is arranged in a urine drainage cavity which is used for catheterization. The urine drainage chamber department sets up the success or not that the catheter intubate of observation window can be convenient, and when the intubate succeeded, urine flowed down along urine drainage chamber from the bladder, and urine can be observed to urine observation window department, simultaneously, cooperation diaphragm, under the condition that the expansion director was not taken out, can effectually avoid urine outflow pipe, prevent urine pollution.

The external surface of the expansion body is provided with an elastic sleeve film matched with the expansion body. The length of the elastic sleeve film is matched with that of the first expansion strip, and the inner side wall of the elastic sleeve film is fixedly connected with the first expansion strip. The elastic sleeve membrane increases the contact area between the expansion body and the urethra, reduces the pressure intensity, and reduces the uncomfortable feeling of the patient caused by the expansion of the expansion body.

The guide seat comprises a guide seat lower part, a guide seat upper part and a sleeve seat sleeved on the guide seat upper part, one side of the sleeve seat, which is close to the guide main body, is provided with a round hole matched with the diameter of the guide core rod, and the diameter of the round hole is smaller than that of the sliding sleeve. The sleeve seat and the upper part of the guide seat can slide relatively, the guide body passes through the round hole to be fixed with the upper part of the guide seat, and when the sleeve seat slides relatively to the upper part of the guide seat, the sleeve is pushed to move forward, so that the outer diameters of the guide seat and the sleeve seat are larger, and the operation on the expanding guide is facilitated.

Preferably, the outer surface of the upper part of the guide seat is provided with a first thread, and the inner surface of the sleeve seat is provided with a second thread matched with the first thread. The sleeve seat moves relative to the upper part of the guide seat through the threads, the advancing sliding sleeve can be effectively limited, the advancing sliding sleeve has a resetting trend under the reaction of the expanding body, and an operator can vacate both hands to operate the catheter after the limiting.

The ratio of the length of the first expansion strap to the outer diameter of the catheter is 3:2. After the expansion body is expanded, the diameter of the expansion body is larger than the outer diameter of the catheter, so that space is provided for the advancement of the catheter.

The diameter of the urethral catheterization hole is larger than the outer diameter of the introducer body.

Drawings

FIG. 1 is a schematic view of the structure of the present invention

FIG. 2 is a schematic view of the structure of an unexpanded stent

FIG. 3 is a schematic view of the structure of the dilation guide after inflation of the dilation body

FIG. 4 is a schematic view at A in FIG. 3

FIG. 5 is a schematic view at B in FIG. 3

FIG. 6 is a cross-sectional view at C in FIG. 1

In the figure:

1. introducer body 2, expansion body 3, and introducer seat

4. Sliding sleeve 11, guide 12, and expansion body

13. Guide core bar 21, first expansion bar 22, second expansion bar

23. Elastic sleeve film 31, guide seat lower part 32, guide seat upper part

33. Sleeve seat 5, conduit 51 and urethral catheterization hole

52. Diaphragm 53, urine observation window

Detailed Description

Example 1

The utility model provides a stenosis expansion catheter, includes pipe 5 and expansion director, the one end of pipe 5 is equipped with catheter hole 51, and pipe 5 cover is outside in the expansion director, the expansion director includes guide main part 1, expansion body 2, guide seat 3 and slip cap 4, guide main part 1 includes guide part 11, expansion body 12 and guide core bar 13 in proper order, slip cap 4 slip cap is in guide core bar 13, and guide core bar 13 links to each other with guide seat 3, expansion body 2 sets up in expansion body 12, expansion body 2 includes not less than 3 group expansion skeleton, the expansion skeleton includes first expansion strip 21 and second expansion strip 22, and the one end of first expansion strip 21 is articulated with guide part 11, and the one end of second expansion strip 22 is articulated with the middle part of first expansion strip 21, and the other end of second expansion strip 22 is articulated with the tip of slip cap 4, the length of guide core bar 13 is not less than the length of pipe 4.

The expansion body 12 is provided with at least 1 track groove parallel to the axis of the expansion guide, and the inner side of the end part of the sliding sleeve 4 connected with the second expansion strip 22 is provided with a protrusion matched with the track groove.

The urine drainage cavity is arranged in the catheter 5, one end of the urine drainage cavity is communicated with the urine guiding hole 51, the other end of the urine drainage cavity is communicated with a port of the catheter 5 far away from one end of the urine guiding hole 51, and a diaphragm 52 for blocking urine is arranged on the inner wall of one end of the urine drainage cavity far away from the urine guiding hole.

The side wall of the catheter 5, which is close to one side of the urine guiding hole 51, is provided with a urine observing window 53 at the diaphragm 52.

The size of the diaphragm 52 is matched with the size of the urine drainage cavity, and a round hole matched with the outer diameter of the main body part is formed in the middle of the diaphragm 52.

The outer surface of the expansion body 2 is provided with an elastic sleeve film matched with the expansion body 2.

The length of the elastic sleeve film is matched with the length of the first expansion strip 21, and the inner side wall of the elastic sleeve film is fixedly connected with the first expansion strip 21.

The guide seat 3 comprises a guide seat lower part 31, a guide seat upper part 32 and a sleeve seat 33 sleeved on the guide seat upper part 32, one side of the sleeve seat 33 close to the guide main body 1 is provided with a round hole matched with the diameter of the guide core rod 13, and the diameter of the round hole is smaller than that of the sliding sleeve 4.

The outer surface of the upper part 32 of the guide seat is provided with a first thread, and the inner surface of the sleeve seat 33 is provided with a second thread matched with the first thread.

The ratio of the length of the first expansion strip 21 to the outer diameter of the catheter 5 is 3:2.

The diameter of the catheterization hole 51 is larger than the outer diameter of the introducer body 1.

Example 2

The inner side of the end part of the sliding sleeve 4 connected with the second expansion strip 22 is provided with at least 1 track groove parallel to the axis of the expansion guide, and the expansion body 12 is provided with a protrusion matched with the track groove.

Example 3

The diaphragm 52 is a valve of not less than 2 petals. The two valves are matched with each other and press the main body part, so that the urine drainage cavity is divided into 2 non-communicated cavities.

Example 4

The end surface of the sleeve seat 33 close to the catheter 5 is provided with a corrugated pipe, and the sum of the height of the corrugated pipe and the length of the sliding sleeve 4 is matched with the length of the guide core rod 13.

When the sleeve seat 33 drives the sliding sleeve 4 to move forwards, the corrugated pipe between the guide pipe 5 and the end surface of the sleeve seat 33 close to the guide pipe 5 is compressed, the resetting trend of the compressed corrugated pipe pushes the guide pipe 5 to move forwards, and an operator does not need to push the guide pipe 5 relative to the guide body 1, so that the intubation is more convenient.

Example 5

The end surface of the sleeve seat 33, which is close to the catheter 5, is provided with a spring, and the sum of the stretching length of the spring and the length of the sliding sleeve 4 is matched with the length of the guide core rod 13.

When the sleeve seat 33 drives the sliding sleeve 4 to move forwards, the spring between the catheter 5 and the end surface of the sleeve seat 33 close to the catheter 5 is compressed, and the restoring trend of the compressed spring pushes the catheter 5 to move forwards, so that an operator does not need to push the catheter relative to the introducer body, and the intubation is more convenient.

Example 6

The diaphragm 52 is a valve of not less than 2 petals.

The sleeve seat 33 is slidably connected with the upper portion 32 of the guide seat, and the upper portion 32 of the guide seat is provided with a limiting device. The limiting device comprises a limiting rod penetrating through the upper portion 32 of the guide seat along the radial direction of the upper portion 32 of the guide seat, the length of the limiting rod is larger than the diameter of the upper portion 32 of the guide seat, and an elastic body is arranged in the middle of the limiting rod.

The introducer body 1 expands the urethra through the expander body 2, with the net effect of advancing the tube body 5 over the exterior of the expanded introducer. When the expandable body 2 is supported, the expandable body 2 is pressed by the urethral wall, the expandable body 2 tends to shrink inwards, the sliding sleeve 4 also tends to reset backwards, the sleeve seat 33 contacts with the sliding sleeve 4, and the sleeve seat 33 also tends to reset backwards, at this time, the sliding sleeve 4 and the introducer main body 1 need to be relatively fixed, that is, the sleeve seat 33 and the upper portion 32 of the introducer seat need to be relatively fixed, so as to keep the deformation of the expandable body 2. The elastic body is arranged in the limiting device, in a normal state, the elastic body is compressed, the length of the limiting rod is equal to the inner diameter of the sleeve seat 33, the limiting rod is positioned in the sleeve seat 33, when the sleeve seat 33 slides forwards, the tail end of the sleeve seat 33 is separated from the limiting rod, the elastic body of the limiting rod expands, the length of the limiting rod is larger than the inner diameter of the sleeve seat 33, and the limiting effect on resetting of the sleeve seat 33 is achieved.

The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.

Claims

1. The utility model provides a stenosis expands catheter, includes pipe and expansion guide, the one end of pipe is equipped with the catheterization hole, and the pipe cover is outside in the expansion guide, its characterized in that: the expansion guide comprises a guide body, an expansion body, a guide seat and a sliding sleeve, wherein the guide body sequentially comprises a guide part, an expansion body and a guide core rod, the sliding sleeve is sleeved on the guide core rod in a sliding mode, the guide core rod is connected with the guide seat, the expansion body is arranged on the expansion body, the expansion body comprises at least 3 groups of expansion frameworks, each expansion framework comprises a first expansion strip and a second expansion strip, one end of each first expansion strip is hinged to the guide part, one end of each second expansion strip is hinged to the middle of each first expansion strip, the other end of each second expansion strip is hinged to the end of the corresponding sliding sleeve, the length of the guide core rod is not less than that of the guide pipe, a urine drainage cavity is arranged in the guide pipe, and a diaphragm for blocking urine is arranged on the inner wall of one end of the urine drainage cavity, which is far away from the urine guide hole, of the guide pipe.

2. The stenotic dilation catheter of claim 1, wherein: the expansion body is provided with at least 1 track groove parallel to the axis of the expansion guide, and the inner side of the end part of the sliding sleeve connected with the second expansion strip is provided with a bulge matched with the track groove.

3. The stenotic dilation catheter of claim 1, wherein: the inner side of the end part of the sliding sleeve connected with the second expansion strip is provided with at least 1 track groove parallel to the axis of the expansion guide, and the expansion body part is provided with a bulge matched with the track groove.

4. The stenotic dilation catheter of claim 1, wherein: one end of the urine drainage cavity is communicated with the urethral catheterization hole, and the other end of the urine drainage cavity is communicated with a port of the catheter at one end far away from the urethral catheterization hole.

5. The stenotic dilation catheter of claim 4, wherein: the side wall of the catheter, which is close to one side of the urethral catheterization hole, is provided with a urine observation window.

6. A stenotic dilation catheter in accordance with claim 5, wherein: the size of the diaphragm is matched with the size of the urine drainage cavity, and a round hole matched with the outer diameter of the main body part is formed in the middle of the diaphragm.

7. A stenotic dilation catheter in accordance with claim 5, wherein: the diaphragm is a valve with no less than 2 valves.

8. The stenotic dilation catheter of claim 1, wherein: the external surface of the expansion body is provided with an elastic sleeve film matched with the expansion body.

9. The stenotic dilation catheter of claim 8, wherein: the length of the elastic sleeve film is matched with that of the first expansion strip, and the inner side wall of the elastic sleeve film is fixedly connected with the first expansion strip.

10. The stenotic dilation catheter of claim 1, wherein: the guide seat comprises a lower part of the guide seat, an upper part of the guide seat and a sleeve seat sleeved on the upper part of the guide seat, wherein one side of the sleeve seat, which is close to the guide main body, is provided with a guide seat

And the diameter of the round hole is smaller than that of the sliding sleeve.

11. The stenotic dilation catheter of claim 10, wherein: the outer surface of the upper part of the guide seat is provided with a first thread, and the inner surface of the sleeve seat is provided with a second thread matched with the first thread.

12. The stenotic dilation catheter of claim 1, wherein: the ratio of the length of the first expansion strip to the outer diameter of the catheter is 3:2-3:1.

13. The stenotic dilation catheter of claim 1, wherein: the diameter of the urethral catheterization hole is larger than the outer diameter of the introducer body.