CA1326426C - Dilatation catheter for the carotid artery - Google Patents

Dilatation catheter for the carotid artery

Info

Publication number
CA1326426C
CA1326426C CA000613007A CA613007A CA1326426C CA 1326426 C CA1326426 C CA 1326426C CA 000613007 A CA000613007 A CA 000613007A CA 613007 A CA613007 A CA 613007A CA 1326426 C CA1326426 C CA 1326426C
Authority
CA
Canada
Prior art keywords
balloon
dilatation
support tube
catheter
dilatation catheter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CA000613007A
Other languages
French (fr)
Inventor
Ramazan Ali Ahmadi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Europe GmbH
Original Assignee
Schneider Europe GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schneider Europe GmbH filed Critical Schneider Europe GmbH
Application granted granted Critical
Publication of CA1326426C publication Critical patent/CA1326426C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00Catheters; Hollow probes
    • A61M25/10Balloon catheters
    • A61M25/104Balloon catheters used for angioplasty
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00Catheters; Hollow probes
    • A61M25/10Balloon catheters
    • A61M25/1011Multiple balloon catheters
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00Catheters; Hollow probes
    • A61M25/10Balloon catheters
    • A61M2025/1043Balloon catheters with special features or adapted for special applications
    • A61M2025/1052Balloon catheters with special features or adapted for special applications for temporarily occluding a vessel for isolating a sector
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00Catheters; Hollow probes
    • A61M25/10Balloon catheters
    • A61M2025/1043Balloon catheters with special features or adapted for special applications
    • A61M2025/1095Balloon catheters with special features or adapted for special applications with perfusion means for enabling blood circulation while the balloon is in an inflated state or in a deflated state, e.g. permanent by-pass within catheter shaft

Abstract

DILATATION CATHETER FOR WIDENING OF STRICTURES
Abstract A dilatation catheter intended in particular for treatment of strictures in the carotid artery has at its front end a dilatation balloon, which is inserted in the folded state into the carotid artery and is inflated in order to widen the stricture. In front of the dilatation balloon a sealing balloon is arranged which serves to seal off the carotid artery downstream of the stricture, in order thereby to prevent a migration of any stricture material which may become detached during treatment, and thus to avoid the risk of an embolism. Between the dilatation balloon and the sealing balloon there is a draw-off and inlet opening through which, after widening and with the sealing balloon inflated, detached stricture material can be drawn off or washed away.

Description

1 ~32~26 64680-508 The invention relates to a dllatatlon catheter for the widening of a stricture in a blood ve~el comprlslng a dilatation balloon arranged on a support tube and extensible up to a deflned extent by ~eans of an external pre~sure/suctlon pump to be connected to the support tube.
Dilatation catheter~ of thi~ type are generally known and are u~ed ln partlcular for the wldenlng of ctrictures ln the arterial system. Such conventional dilatation catheters could not be used for treating strictures (~tenoses) in the carotid artery on ascount of the hlqh rlsk of an embollsm. Therefore, in the treatment of strictures in the carotid artery, the comparatively mlld treatment with a catheter ha~ hltherto had to be dispensed wlth.
It i8 an ob~ect of the present lnventlon to provide a dilatatlon catheter of the above type, which 18 partlcularly suitable for the widening of steno6es ln the carotid artery.
The lnvention is a dilatation catheter for the wldenlng of a stricture in a blood vessel comprlsing an elongated dilatatlon balloon arranged on a support tube and extenslble up to a deflned extent by means of an external pres~ure/~uctlon pump to be connected to the support tube, and a eeallng balloon arranged on the support tube ln the axlal dlrectlon dlstally of and at a dlstance fro~ the dllatatlon balloon, the wall of whlch seallng balloon 18 elastlcally extenslble by means of an external pre~sure/~uctlon pump to be connected to the support tube, ln order to seal off the ve~el di~tally of the strlcture, with a draw-off and lnlet openlng belng provlded ln the support tube betveen the dllatatlon balloon and the seallng balloon, sald ~ 1 32~2~
opening being of a size sufficient to accommodate detached stricture material which can be drawn off to the exterlor of the catheter or through whlch a washing fluid can be introduced.
The dllatation catheter can be inserted lnto the ve~sel to be treated in a known manner by means of a guide wire. By meanæ of the seallng balloon it is po~ible to ~eal the ves6el off downstream of the stricture viewed ln the direction of flow of the blood, in ~uch a way that none of the particles, which may possibly become detached during treatment of the strlcture, can be carried away. In thi~ way the risk of an eLbolism is avoided.
After the vessel is sealed off, the stricture can be widened mechanically by means of the dilatation balloon in a manner known per se. Here, detached particles remaln in the area of the stricture and, after treatment of the stricture, can be completely removed or washed away through the draw-off and lnlet device arranged between the two balloons. Advantageous further developDent~ are described hereinbelow.
An exemplary embodiment of the invention is illustrated in greater detall below wlth reference to the drawlngs, in which.
FIG. la show~, on an enlarged 6cale, a side vlew of the front part of a dilatatlon catheter accordlng to the lnvention;
FIG. lb shows a side vlew of the rear part Or the dllatatlon catheter;
FIG. 2 show6 a cross-sectlon through the dllatatlon catheter along the llne II-II ln FIG. l; and FIGS. 3a to 3d show a dlagrammatlc representatlon of a sectlon of the carotid artery, wlth the front part of the catheter inserted thereln, ln dlfferent phases during treatment of a strlcture.

_3_ ~32~2~

The dilatation catheter depicted in the drawings has a flexible support tube 6 with a continuous central channel 11 for receiving a likewise flexible guide wire 7. With the aid of the guide wire 7, the front end of the dilatation catheter can be pushed forwards to a longitudinal position 20 in the vessel 19 to be treated. In order to widen the stricture 20, there is arranged on the support tube 6 a dilatation balloon 2 which is folded during insertion of the cathe~er and lO which can be adjustably inflated up to a defined extent by means of a pressure/suction pump (not shown here) to be connected at a nipple 16. The pressure/suction pump is connected to the interior space of the dilatation catheter via a pressure channel 8, which ten~inates 15 with openings 3 in the interior space. For X-ray positioning of the dilatation balloon 2, two metallic rings are arranged on the support tube 6. It is essential that the dilatation balloon 2 has a very slight elasticity at the pressures customary here and cannot be extended bevond the said defined extent.
In front of the dilatation balloon 2 and at a distance from it a sealing balloon 1 is arranged which, in the rest position, bears tightly on the support tube 6. This balloon is approximately l to 2 cm long and is firmly connected at its two ends to the support tube 6, for example welded on the support tube. In contrast to the dilatation balloon 2, this sealing balloon 1 is rubber-elastic and can be expanded with extensio~ of it~ wall. The sealing balloon 1 i~ preferably made of latex. By means of a pressure/suction pu~p (not shown here), the sealing balloon 1 can be adjustably inflated into the spherical shape shown by dot-and-dash lines FIG. la. This pressure/suction pump is joined at the nipple 18 and is connected to the interior space of the sealing balloon 1 ~ia a pressure channel 9. The channel 9 leads into this interior space via an opening 5 in the support tube 6.
Between the sealing balloon 1 and the dilatation balloon 2, the support tube 6 has a draw-off/inlet opening 4 which opens directly into the vessel 19 and Leads via a channel 10 to a nipple 15 which is to be connected to a draw-off/inlet device (also not shown here). Particles which have become detached from the stricture during widening thereof can be drawn off or lo washed away through this draw-off/inlet opening during and after treatment.
From the openings 3 to a branch 1~ the support tube 6 has four lumens, from this branch point 14 to the branch point 13 it has three lumens, and on the 15 rearmost stretch up to branch piece 12 it has two lumens. The nipples 15 and 18 are connected to the corresponding branch positions via single-lumen tube sections. The channels to the openings 3, 4 and 5 are separate, so that the two balloons 1 and 2 can be inflated independently of each other, and material can be drawn off or let in through the opening 4 independently of the state of these balloons.
The use of the dilatation catheter is illustrated in greater detail with reference to FIGS. 3a to 3d.
The front end of the dilatation catheter is pushed forwards to the stricture 20 in the vessel 19 with the aid of the guide wire 7. The dilatation balloon 2 i8 folded during this step, and the sealin~ balloon 1 lies unstressed on the support tube 6. When the dilatation balloon 2 has been positioned, the sealing balloon 1 is inflated to such an extent that it bears on the inner side of the vessel 19 and seals the latter off to such an extent that no more body fluid can flow through at this point. This state is shown in FIG. 3a, where it can alqo be clearly seen that the soft and rubber-elastic ~~ 5 ~2~fi sealing balloon 1 has come to bear sealingly on the vessel 19 without significant extension of the latter.
In the next step the dilatation balloon 2 is inflated and, as its size increases, it widens the stricture 20, which generally consists of spongy, calcium-rich and fat-rich tissue. By means of this widening, the tissue forming the stricture is partially pressed into the vessel wall.
Now, as shown in FIG. 3c, the dilatation balloon 2 10 is brought into the contracted shape, and, at the sa~e time or shortly before, body fluid and with it any detached stricture material is removed from the vessel 19 through the draw-off/inlet opening 4 in the direction of the arrows 21 and/or washed away in the 1S direction of the arrows 22 (FIG. 3c). Finally, the sealing balloon 1 is returned to the unstressed form shown in FIG. 3d, and the catheter and the guide wire 7 are removed from the vessel 19. Individual treatment stages can of course also be repeated several times.
The treatment catheter according to the invention is suitable in particular for the treatment of strictures in the carotid artery.

Claims (9)

1. A dilatation catheter for the widening of a stricture in a blood vessel comprising an elongated dilatation balloon arranged on a support tube and extensible up to a defined extent by means of an external pressure/suction pump to be connected to the support tube, and a sealing balloon arranged on the support tube in the axial direction distally of and at a distance from the dilatation balloon, the wall of which sealing balloon is elastically extensible by means of an external pressure/suction pump to be connected to the support tube, in order to seal off the vessel distally of the stricture, with a draw-off and inlet opening being provided in the support tube between the dilatation balloon and the sealing balloon, said opening being of a size sufficient to accommodate detached stricture material which can be drawn off to the exterior of the catheter or through which a washing fluid can be introduced.
2. A dilatation catheter of claim 1 wherein the sealing balloon has a rubber-elastic wall.
3. A dilatation catheter of claim 2 wherein the sealing balloon is made of latex.
4. A dilatation catheter of claim 1 wherein the sealing balloon bears upon the support tube in its rest position.
5. A dilatation catheter of claim 2 wherein the sealing balloon is spherical when freely inflated.
6. A dilatation catheter of claim 1 wherein the dilatation balloon and the sealing balloon are inflatable independently of each other via separate channels provided in the support tube.
7. A dilatation catheter of claim 1 wherein the sealing balloon is radially extensible beyond said defined extent of the dilatation balloon.
8. A dilatation catheter of claim 7 wherein, with the sealing balloon inflated and the dilatation balloon folded, material can be drawn off or introduced through said draw-off and inlet opening.
9. A dilatation catheter of claim 8 wherein the support tube is provided with four lumens, including a central channel provided for receiving a guide wire.
CA000613007A 1988-09-27 1989-09-25 Dilatation catheter for the carotid artery Expired - Fee Related CA1326426C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3584/88A CH676426A5 (en) 1988-09-27 1988-09-27
CH3584/88 1989-09-27

Publications (1)

Publication Number Publication Date
CA1326426C true CA1326426C (en) 1994-01-25

Family

ID=4259148

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000613007A Expired - Fee Related CA1326426C (en) 1988-09-27 1989-09-25 Dilatation catheter for the carotid artery

Country Status (7)

Country Link
US (1) US5163906A (en)
EP (1) EP0362146B1 (en)
JP (1) JPH02237574A (en)
AT (1) ATE90215T1 (en)
CA (1) CA1326426C (en)
CH (1) CH676426A5 (en)
ES (1) ES2042063T3 (en)

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CH676426A5 (en) 1991-01-31
EP0362146A1 (en) 1990-04-04
JPH0445188B2 (en) 1992-07-24
JPH02237574A (en) 1990-09-20
EP0362146B1 (en) 1993-06-09
ES2042063T3 (en) 1993-12-01
ATE90215T1 (en) 1993-06-15
US5163906A (en) 1992-11-17

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