JPS62266078A - Kidney-ureter catheter unit especially adapted for discharge of crushed stone - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a renal-ureteral catheter unit particularly adapted for evacuation of crushed stones.

More specifically, the present invention relates to shock waves.

It is used to aid in the drainage of stone fragments obtained from the destruction of kidney stones by modern techniques using ultrasound or the like.

[Conventional technology]

Currently, stone fragments obtained as a result of the above treatments are directly excreted through the ureter and urethra. However, this solution causes a series of complications. This is because, especially when stones of large size are involved, the resulting fragments cannot pass through the ureter due to their relatively large size and the fact that they are numerous.

On the other hand, it should be noted that the current state of the art does not allow satisfactory evacuation of said fragments through drainage. This is essentially due to the fact that the ureter is a very flexible tube and has very tight clearances, so that it is difficult to introduce an appropriately sized catheter or probe into it without injuring it. is almost impossible.

For the above reasons, modern and convenient techniques consisting of "impact" stone formation by ultrasound or similar means cannot be used when kidney stones are of relatively large size.

[Problem that the invention seeks to solve]

We therefore overcome the two particular drawbacks by providing a trimmed nephro-ureteral catheter unit, so that the unit can be inserted into the urethra and ureter without injury, and even if stone fragments are relatively It is an object of the invention to be able to eject those stone fragments, even if they are large in size and numerous.

A further object of the invention is to provide a unit that is convenient to operate and use, and easy to manufacture industrially.

[Means for solving problems]

The foregoing and a further object which will become more apparent below are substantially achieved by a renal-ureteral cachicil unit specially adapted for expelling crushed stones, which a flexible member provided with a substantially tapered conical insertion end in the vicinity of the perforated at least one drainage hole extending substantially in the knee radial direction comprising: Tubular catheter: a semi-rigid dilatation mandrel in tubular form provided with a tapered conical insertion end, the mandrel comprising:
and an expansion mandrel that is longer than the catheter and can be slid within the catheter to bring it into an inserted state with the insertion end extending beyond the insertion end of the catheter. Semi-rigid guide element with cylindrical cross section showing a rounded insertion end.

[Specific explanation]

With reference to the drawings and in particular to FIG. 1, reference numeral 1 generally indicates a renal-ureteral cachytile unit specifically adapted for evacuation of crushed stones according to the invention.

The unit 1 comprises a catheter 2 of suitable length and has a cylindrical tubular cross section. The catheter 2 is provided with a substantially tapered conical insertion end 2a. Near its insertion end 2a, a substantially radial 1
Or more drainage holes 3 can be opened. More specifically, two drainage holes 3 are provided, which are arranged at diametrically opposite positions kept at different distances from the insertion end 2a.

The catheter 2 is manufactured from a specially studied flexible material so that its inner diameter can be made as large as possible while keeping the outer diameter unchanged.

In addition to the above characteristics, the material of the catheter 2 should be soft and biocompatible so that it can remain inside the body for a long time without causing any damage.

For this purpose, the catheter 2 is made of, for example, polyvinyl chloride (resin) and low density polyethylene composition.

In addition, plasticizers and diluents such as di-2-ethylhexyl phthalate, epoxy soybean oil, calcium zinc stearate in epoxy soybean oil.

Basic zinc octoate (22%), calcium-zinc stearate in organic base, glycerol mono-oleate and/or other frequently occurring products are added and prepared.

Furthermore, the material used for the catheter 2 is advantageously a radiopaque material so that its position within the patient's body can be checked by radiography. This feature can be achieved, for example, by adding barium sulfate to the above-mentioned compositions.

The unit l also comprises an expansion mandrel 4 of cylindrical tubular cross-section, provided with an insertion end 4a consisting essentially of a tapered conical shape. The dilation mandrel 4 is longer than the catheter 2 and its outer diameter is slightly smaller than the inner diameter of the catheter, so that the dilation mandrel can slide within the collar-chill. actual,
Said expansion mandrel 4 should be engaged inside the catheter so that it follows an insertion arrangement such that the insertion end 4a of the mandrel 4 extends beyond the insertion end 2a of the catheter as shown in FIG. may be placed. Preferably, in the inserted state, the mandrel 4 and the insertion ends 4a and 2a of the catheter 2 are respectively
Having each generator substantially aligned so that a substantially continuous trapezoidal conical surface can be obtained.

Preferably, the mandrel 4 is manufactured from a semi-rigid plastic material, which can be made radiopaque, for example by the addition of barium sulfate to said material composition.

The mutual position of the mantle 4 and the catheter 2 according to the above insertion arrangement is such that the catheter 2 at the end opposite the insertion end 2a
A fastening, preferably consisting of a spring 5 acting against the gasket, is achieved. According to the invention, the spring 5 consists of a substantially parallel first fastening part 6 and a second fastening part 7, which are connected to each other by means of a spring part. The fastening parts 6 and 7 are connected to the facing fastening parts 9 and 1, respectively.
0 is provided.

The spring 5 also has a detent part 1 adjacent to the first fastening part 6 and extending from them towards the free end of the fastening part 7.
1.

A first aperture 8a and a second aperture 11a feed the clasp part 11 and the spring part 8, respectively, and through these apertures the spring 7 is inserted into the catheter 2 as shown in FIG.
You can slide on it.

The fastening parts 6 and 7 are moved from a rest position (where they are kept spaced apart from each other so that the spring 5 can slide on the catheter 2) to operating conditions (
Here, the fastening parts are kept at a maximum distance from each other such that the clamping part should be shorter than the outer diameter of the catheter 2 and longer than the outer diameter of the dilation mandrel 4. , are close to each other).

Under these conditions, the catheter 2 is crushed against the expansion mandrel 4 without deforming the mandrel.

In the embodiment shown, it is also advantageous for the clamping parts 9 and 10 to each have a hollow in the form of a semicircle. Figure 3 (here.

As shown in (a front view of the spring 5 is seen under its operating conditions), said hollows 9a and 10a under these conditions:
with a circular opening of diameter smaller than the outer diameter of the catheter and larger than the outer diameter of the mandrel. Under those operating conditions, the mutual position of the fastening parts 6 and 7 is maintained through the engagement of the free end of the second fastening part 7 by the clasp part 11, against the action exerted by the spring part 8.

The catheter unit 1 further comprises a semi-rigid ('I) guide element 12 of cylindrical cross-section, with a diameter slightly smaller than the inner diameter of the dilatation mandrel 4. Guide element 1
2 is a rounded insert intended for slidingly receiving the mandrel 4 and located on the same side as said insert ends 4a and 2a, as clearly shown in FIG. The end 12a is provided.

The operation of the catheter unit of the invention, described primarily in terms of structure, is as follows.

First of all, the guide element 12 (starting from its insertion end 12a) is inserted into the urinary catheter and then, in FIG. The insertion end 12a is inserted into the kidney indicated by 14.
are pushed as close as possible.

Advantageously, the guide element 12 has a diameter as small as that of an elbow, so that it can be easily inserted into the ureter without injuring or traumatizing the ureter.

Then arranged under insertion conditions and effective spring 5
The dilator mandrel 4 and the catheter 2, fastened together by the guide element 12, suitably guide them through the urethra and ureter until their insertion ends 4a and 2a reach the part where the ureter 13 and kidney 14 connect. It is forced to slide. This connecting part is indicated by the reference numeral 13a in FIG.

As mentioned above, the spring 5 has such structural features that its action on the catheter 2 does not cause any deformation on the expansion mandrel 4, so that the sliding of the latter together with the guide element 12 is not prevented. It should be clearly shown that the

Moreover, when arranged for insertion, the insertion ends 4a and 2a of the trapezoidal conical surfaces do not injure or traumatize the urethra and ureter during the insertion operation shown in Section 2. Causes gradual dilatation of the urethra and ureters.

The distal end 2a of the catheter 2 is connected to the connecting portion 13 as described above.
After correctly reaching a, the spring 5 is manually brought to its rest condition and the guide element 12 and expansion mandrel 4 are withdrawn from the catheter 2.

At the end of the above operation, the catheter 2 is inserted into the urethra and ureter and its end 2a is located in the connecting part 13a as shown in FIG. Under these conditions, the presence of drainage holes 3 allows easy evacuation of crushed stone fragments after ultrasound treatment.

It will be appreciated that the dimensions of the drainage hole 3 and the inner diameter of the catheter 2 have been advantageously studied such that they can allow evacuation of even large amounts of fragments of relatively large size.

The present invention achieves the stated objectives. In fact, as is clearly clear from the above description, the catheter unit that is the subject of the invention can be passed through the ureter until it reaches the kidney, without damaging or traumatizing the tube through which it passes. Can be easily inserted into the body. Moreover, as it allows the evacuation of many stones that are of relatively large dimensions, the catheter unit is suitable for ultrasound-type therapy or similar, even when it is necessary to act on large kidney stones. enable use.

Furthermore, the catheter unit of the invention has a very simple structure that can be manufactured industrially at low cost.

[Brief explanation of drawings]

Further features and advantages of the invention will become more apparent from the detailed description of preferred embodiments of the renal-ureteral catheter unit. The unit is hereinafter given in a non-limiting manner with reference to the attached drawings. 1 is a perspective view of the catheter unit in question; FIG. 2 is an enlarged and partially sectional view of the elements constituting the catheter unit of the invention in the region of the insertion end; FIG. FIG. 4 is a perspective view of the component seen in FIG. 3; FIG. 5 is a perspective view of the component seen in FIG. 3; FIG. Figure 6 schematically shows the catheter unit in question inserted into the body through the ureter; and Figure 6 is a cross-sectional view showing the position of the catheter that is part of the unit in question compared to the kidney. Brief description of the drawings: 1... Unit, 2a... Tapered insertion end, 3... Drainage hole, 4a... Mandrel insertion end, 5... Spring, 6... first fastening part, 7
...Second fastening portion, 8a...First opening, 8...
・Spring part, 9...Tightening part, 9a・
...Hollow, IO...Tightening part, 10
a...Hollow, 11...clasp part,
12... Guide element, 12a... Insertion end, 13
... ureter, 13a... connecting part, 14.
··kidney. Construction margin procedure continues in Ura City,! ) (Method) Sunset June 1988 Commissioner of the Patent Office Black 1) Mr. Yu Akira 1, Indication of the case Patent application No. 47865 of 1988 2, Name of the invention Particularly adapted for expelling crushed stones. Kidney
Ureteral Force Teterfuniso 1-3, Relationship with the person making the amendment 1h Applicant's name: Francesco 4, Agent's address: 18-10-5, Toranomon-cho, Minato-ku, Tokyo, 105, Date of amendment order: 1988 May 260 (Delivery 1]) 6. Specification to be amended 7. Engraving of the details of the amendment (no change in content) 8. Engraving of attached documents 1 copy

Claims (1)

Claims: 1. A renal-ureteral catheter unit specifically adapted for draining crushed stones, comprising: - at least one drainage hole (3) extending substantially in the radial direction;
a flexible tubular catheter (2) provided with a substantially tapered conical insertion end (2a) in the vicinity of the opening; - a tapered conical insertion; A semi-rigid expansion mandrel (4) in tubular form provided with an end (4a) which is longer than the catheter (2) and whose insertion end (4a) is connected to the insertion end (2a) of the catheter. a semi-rigid guide element of cylindrical cross-section representing a rounded insertion end (12a) on which the expansion mandrel (4) is slid; 12) A catheter unit comprising: 2. A catheter according to claim 1, further comprising a fastening device (5) adapted to releasably fasten the catheter (2) to the expansion mandrel (4) when in the inserted state. unit. 3. Catheter according to claim 1, in which, when in the insertion state, the insertion ends (2a, 4a) of the catheter (2) and the dilation mandrel (4) are substantially in alignment with their generators. unit. 4. Catheter unit according to claim 1, wherein the catheter (2) is manufactured from a radiopaque material. 5. Catheter unit according to claim 1, wherein the expansion mandrel (4) is manufactured from a radiopaque material. 6. said fastening device (5) consisting essentially of a spring; - one fastening part (6) provided with one fastening part (9); - substantially parallel to the first fastening part (6); , and a second fastening part (7) representing a second fastening part (10) facing the first fastening part (9); - a spring part (8) connecting the fastening parts (6, 7) to each other;
- towards the free end of the second fastening part (7) the first fastening part (
6), and each tightening part (9, 10
) are shorter than the outer diameter of the catheter (2) and are kept spaced apart from each other by a distance greater than the outer diameter of the expansion mandrel (4), the action exerted by the spring part (8) as opposed to the latter in a removable manner to retain the fastening parts (6, 7).
Catheter unit according to claims 1 and 2, comprising a catch portion (11) which engages with the clasp portion (11). 7. The spring (5) has the first (8a) and second (
7. Catheter unit according to claim 6, which slides along the catheter (2) through 11a). 8. Said clamping part (9, 10) is provided with a respective surface hollow (9a, 10a) of semicircular cross section, and under operating conditions it is smaller in diameter than the outer diameter of the catheter (2); A catheter unit according to claim 6, wherein the catheter unit is provided with a circular opening having a diameter larger than the outer diameter of the mandrel (4). 9. Catheter unit according to claim 1, wherein the catheter (2) is manufactured from a plastics material consisting of polyvinyl chloride (resin) and low density polyethylene, added with plasticizers and diluents.