CA2213522C - Catheter for detaching abnormal deposits in human blood vessels - Google Patents

Catheter for detaching abnormal deposits in human blood vessels Download PDF

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Publication number
CA2213522C
CA2213522C CA002213522A CA2213522A CA2213522C CA 2213522 C CA2213522 C CA 2213522C CA 002213522 A CA002213522 A CA 002213522A CA 2213522 A CA2213522 A CA 2213522A CA 2213522 C CA2213522 C CA 2213522C
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CA
Canada
Prior art keywords
rotor
stator
catheter
catheter according
drive shaft
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 - Lifetime
Application number
CA002213522A
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French (fr)
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CA2213522A1 (en
Inventor
Immanuel Straub
Helmuth Mohr
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Straub Medical AG
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Straub Medical AG
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Publication date
Application filed by Straub Medical AG filed Critical Straub Medical AG
Publication of CA2213522A1 publication Critical patent/CA2213522A1/en
Application granted granted Critical
Publication of CA2213522C publication Critical patent/CA2213522C/en
Anticipated expiration legal-status Critical
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/3205—Excision instruments
    • A61B17/3207—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions
    • A61B17/320783—Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions through side-hole, e.g. sliding or rotating cutter inside catheter
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00681—Aspects not otherwise provided for
    • A61B2017/00685—Archimedes screw
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B2017/22038—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with a guide wire

Abstract

The invention concerns a catheter (12) which is connected to a drive unit (20) and has at its front end (12a) a cutting tool comprising a stator (14) and rotor (16). Peripheral blades of the rotor (16) and stator (14) co-operate in scissors-like manner. The rotor (16) is an outside rotor. The detached deposits are conveyed through a tubular casing (22), via a discharge chamber (18), into a collector vessel (28). A rotary catheter of this type is used for gently removing thrombi and stenoses from narrowed blood vessels, such as arteries and veins.

Description

CATHETER FOR DETACHING ABNORMAL DEPOSITS IN HUMAN
BLOOD VESSELS

The invention relates to a catheter of the type known as a rotary catheter. Rotary catheters for detaching abnormal deposits from blood vessels in humans generally consist of a cutting tool which is arranged at its front end and which has a stator and a rotor which can be set in rotation by means of a rotary drive mechanism of a drive unit. The rotor is equipped with a cutting edge within the circumferential surface, and also with a tubular sheath for discharging the deposits which have been detached.
A catheter of this kind is used in particular for treating occlusive diseases of the arteries by dislodging and breaking up stenoses and blood clots.
It is introduced into the artery or vein and is advanced as far as the stenosed area which is to be treated. A cutting tool which can be driven in rotation is arranged at its front or leading end.
In the case of a catheter known from WO-Al-91/01114, and along the lines of that described above, the rotor arranged inside the stator has, on its end face directed counter to the direction of advance of the catheter, a circumferentially extending, undulating cutting edge. Within its circumferential surface, the stator has a cutout with a"beak-like" margin directed counter to the cutting edge of the rotor. If, during its advance on the side of the cutout in the stator, the catheter hits upon deposits, then these deposits pass at least partially into the cutout. The advance of the catheter must then be interrupted and the cutting tool must be pre-tensioned against the deposits by means of a manually operated tensioning device engaging on the opposite side of the artery or vein.
The rotor which is driven in rotation must then be drawn back by hand against the margin in the stator cutout, by means of an operating device engaging on its flexible drive shaft, while its cutting edge cuts off the deposits protruding into the cutout, the margin in the stator acting as a counterstay. The cutting procedure accordingly takes place in the longitudinal direction with respect to the catheter. The deposits which have been cut off are sucked off by means of a vacuum applied to the catheter tube.
This known catheter is complicated to operate and does not permit a continuous advance. It is additionally associated with the risk that it will pinch the deposits via its "beak-shaped" edge if it is advanced too far. In these circumstances, injury to the artery or vein cannot be ruled out.
A further known catheter, the one from EP-Bl-0,267,539, has as its cutting tool a substantially elliptical milling cutter which is provided with abrasive material on its surface and is driven at a speed of up to 160,000 rpm. The milling cutter is connected via a flexible drive shaft to a rotary drive mechanism which is arranged at the other end of the catheter. The drive shaft runs through a tubular sheath which serves as a catheter tube. A guide wire extending right through the drive shaft is introduced into the artery or vein before introduction of the catheter and is pushed forwards.
In this known rotary catheter, it is not possible to exclude the risk of the vessel wall being damaged, particularly at a curve, and in some cases even being drilled through.
Another known rotary catheter has a cutting tool which has two stripping blades and which is driven at a speed of 750 rpm. In this catheter, there is a risk that the stripping blades may, particularly at the relatively slow circumferential speed, pinch or tear or get caught in the vessel wall.
The invention is therefore based on the object of providing a catheter which is of the type mentioned at the outset and which on the one hand ensures that abnormal deposits in the blood vessels of humans are dislodged cleanly, and on the other hand makes damage to the vessel wall highly improbable.
According to the invention, the object set is accomplished by means of a catheter for detaching abnormal deposits from blood vessels in humans, with a cutting tool which is arranged at its front end and which has a stator and a rotor which can be set in rotation by means of a rotary drive mechanism of a drive unit. The rotor is equipped with a cutting edge within the circumferential surface, and also with a tubular sheath for discharging the deposits which have been detached. Also, the rotor surrounds a portion of the stator as external rotor, and the at least one opposing cutting edge is arranged in the circumferential surface of the stator portion and interacts in a shearing acting with the cutting edge of the rotor.
The catheter according to the invention ensures that only deposits which are protruding and which come between the cutting edges can be caught and dislodged. The possibility of the vessel wall being damaged by the cutting tool is virtually ruled out here. Moreover, the risk of the cutting tool of such a catheter tearing and pinching the vessel wall is in practice eliminated by the shearing action in conjunction with the opposite cutting edge.
In a preferred embodiment in which the rotor and the portion of the stator are cylindrical, at least in the area of the cutting edges, the rotor attacks the deposits radially. This ensures that it is not possible, for example in the area of curves, to drill straight into the vessel wall.
Additional safety against damage to the vessel wall is afforded by an embodiment in which shearing slots are arranged in the circumferential surfaces of the stator portion and of the rotor, their margins being designed as the cutting edges. By means of the provision of shearing slots, in the final analysis only those deposits which protrude into the shearing slots are detached.
In an embodiment in which the stator portion and the rotor have two shearing slots each, which are offset by 180 to each other in the circumferential direction, symmetry of the shearing action results since diametrically opposite sites on the vessel wall are attacked simultaneously. This results in a better concentric running of the rotor than would be possible if the latter were to attack the vessel wall only at one circumferential site.
A swivel drive mechanism can be connected to the protruding rear end of the tubular sheath or, in a miniaturized configuration, can act directly on the stator. It is also possible to arrange a miniaturized reduction gear unit between the rotor and the stator in order to drive the stator by means of the rotational movement of the rotor, preferably in the opposite rotational direction in relation to the rotor.
A preferred embodiment is to arrange the at least one cutting edge of the stator to run in an undulating configuration in at least approximately the axial direction, relative to a cylindrical surface. It is also possible, however, to arrange straight cutting edges inclined with respect to the axial direction, or to use cutting edges which are knife edges.
An embodiment in which the rotor is at least partially tapered in the direction of its front end allows the rotor, even before the shearing action is started, to dislodge from the vessel wall any deposits which are protruding or bulging into the shearing slot.
The following embodiment ensures that the rotor forces its way through the blood vessel, in particular at stenosed or blocked sites: that the rotor has one front face and two adjoining bevelled surfaces lying opposite each other, and the front face has on the circumference, forwardly extending projections.
It is preferred that the stator and rotor are of metal. It is also possible, however, to use other materials for this purpose, for example suitable plastics.
It is preferred that the stator be attached in a manner fixed in terms of rotation and tensioning, to the tubular sheath serving as catheter tube. It is also possible, however, to fasten the stator in a movable manner at the tip or the leading end of the tubular sheath.
It is preferred that the stator be mounted such that it revolves or can swivel to and from about its longitudinal axis. This ensures that the cutting tools dislodges material about the whole circumference of the vessel wall, the stator being moved in such a way that the shearing slots arranged in it execute either a slowly revolving or reversible swivel movement about the longitudinal axis of the stator. With such a movement, the stator executes either a continuously helical movement, or a helical movement directed alternately to the left and to the right, during the advance. In the most straightforward case, such a movement can be effected manually by the attending physician if the stator is connected to the tubular sheath in a manner fixed in terms of rotation and tensioning.
It is preferred that the stator is sleeve-like formed and has in its circumferential surface, at its end adjacent to the tubular sheath, at least one hole for anchoring the sheath, which is made of plastic and is press-fitted into the stator, in a manner fixed in terms of rotation and tensioning. This provides a particularly simple way of fastening the stator on the tubular sheath so that they are fixed in terms of rotation and tensioning.
It is preferred that the rotor be driven by connecting the rotor to the front end of a flexible drive shaft mounted in the tubular sheath, the rear end of which drive shaft can be connected to the rotary drive mechanism. It is also possible, however, to drive the rotor directly by means of a miniaturized gearing.
It is preferred that the flexible drive shaft is designed as a conveyor worm or conveyor screw and is wound helically in such a way that, in the driven state, it conveys the broken-up deposits in the direction of the drive unit. This permits immediate withdrawal of the deposits which have been detached and broken up, so as to avoid these deposits remaining in the bloodstream.
The efficacy of the conveyor screw is improved by an embodiment in which a guide wire extends coaxially through the flexible drive shaft designed as conveyor worm or conveyor screw.
An illustrative embodiment of the invention is explained in greater detail with reference to the drawings, in which:
Figure 1 shows a rotary catheter in a general view, with drive mechanism, guide wire and collection container for the deposit fragments which have been detached, Figure 2 shows an elevation of the head part of the rotary catheter according to Figure 1, but on a larger scale, Figure 3 shows the head part as in Figure 2, but in a plan view, Figure 4 shows an end view of the rotor and the guide wire of the rotary catheter according to Figure 3, Figure 5 shows the head part in cross-section along the cutting line V-V in Figure 3, Figure 6 shows the rotary catheter according to Figure 3, but with the rotor turned through 90 relative to the stator, Figure 7 shows a longitudinal section through the head part of the rotary catheter according to Figure 2, Figure 8 shows guide wire and helical winding, in a cross-section through the helical winding, Figure 9 shows the head part of the catheter according to Figure 1 in a perspective representation, viewed from the front end, and Figure 10 shows the head part of the catheter according to Figure 1 in a perspective representation, as seen from the drive side.
The catheter 12 shown in Figure 1 has, at its front end 12a, a cutting tool which consists of a stator 14 and rotor 16. At its rear end 12b, the catheter 12 is connected to a rotary drive mechanism 20a of a drive unit 20 via a discharge chamber 18. A
flexible drive shaft is mounted in a tubular sheath 22 serving as catheter tube and connects the rotor 16 to the rotary drive mechanism 20a. A guide wire 24 runs through the entire length of the catheter 12, and its front end 24a protrudes from the rotor 16 and its rear end 24b from the drive unit 20. A collection container 28 is linked to the discharge chamber 18 in the radial direction via a tube or a pipe 26.
The tubular sheath 22 is connected to a swivel drive mechanism 20b in a manner fixed in terms of rotation. This mechanism can be provided either for a revolving swivel movement or for a reversible swivel movement. Its speed lies substantially below that of the rotary drive mechanism 20a.
The swivel drive mechanism 20b can also be omitted if only the tubular sheath 22 is mounted in a rotatable manner. In such a configuration, the tubular sheath can be set by hand into a revolving or reversible swivel movement when the catheter 12, on being advanced, has reached the site which is to be treated.
It is also possible to uncouple the stator 14 from the tubular sheath 22 and for the stator 14 alone to be mounted so as to swivel, and to equip the stator directly with a miniaturized swivel drive mechanism (not shown).
When using the catheter 12, the guide wire 24 is introduced, with its front end 24a leading, into the artery or vein which is to be treated, and it is advanced as far as the stenosed area and then manoeuvred through the latter, with radiographic monitoring. The catheter 12 is then passed along the guide wire 24. As soon as the rotor 16 has reached the area which is to be treated, the rotary drive mechanism 20a at least is switched on in order to detach the undesired deposits by means of the cutting tool. The speed of rotation of the rotor 16 preferably lies in the range of between 30,000 and 40,000 rpm. The catheter 12 is advanced slowly as the operation proceeds and in so doing is set in a slow swivel movement either by means of the swivel drive mechanism 20b or by hand. The deposits which have been dislodged and broken up are carried off through the tubular sheath 22 as far as the discharge chamber 18 and they pass from there into the collection container 28.
Figure 2 shows the front end 12a of the catheter 12 with its stator 14, its rotor 16 designed as external rotor, its tubular sheath 22, and the front end 24a of the guide wire 24. The tubular sheath 22 is shown cut away at 30 to reveal the flexible drive shaft 32 which, inside the rotor 16, is fixed to the latter in terms of rotation. The guide wire 24 extends through the inside of the drive shaft 32. The drive shaft 32 is additionally designed as a conveyor worm or conveyor screw in order to convey the deposits, which have been dislodged by the cutting tool 14, 16, through the tubular sheath 22 to the discharge chamber 18.
A portion 14a of the stator 14 extends into the rotor 16. It will be seen that the stator portion 14a and the rotor 16 engage one within the other like a bushing. The stator portion 14a has two shearing slots 14b, 14c which are offset 180 to each other about the circumference. The rotor 16 likewise has two slots 16b, 16c which are offset 180 to each other about the circumference.
From Figure 3 it will be seen that the shearing slot 14b of the stator portion 14a is narrower than that 16b of the rotor 16 in the circumferential direction. One margin of the rotor slot 16b is designed as cutting edge 16d. The margin of the stator slot 14b, facing in the opposite direction, is designed as cutting edge 14d. This cutting edge 14d extends in an at least approximately undulating configuration.
The cutting edge 16d and the cutting edge 14d interact in a shearing action. Cutting edges of this type are in each case arranged in both slots 14b, 14c;
16b, 16c which are also referred to as shearing slots, in other words arranged 180 in relation to one another in the circumferential direction. The front end 16a of the rotor 16 tapers at least approximately conically.
In this way, the stenosed area of the artery or vein to be treated is widened upon insertion of the catheter 12.
Figure 4 shows the front elevation of the rotor 16 and of the front end 24a of the guide wire 24.
Also shown are two bevelled surfaces 16e, l6f of the rotor 16, which surfaces run in opposite directions and between which there is a front face 16g. The front face 16g has, on the circumference, horn-like, forwardly extending projections 16h, 16i (Figure 3).
The front of the rotor 16 serves in particular to break up clots obstructing the passage, in order to force a path for the catheter 12 along the blood vessel.
Figure 5 shows a cross-section along V-V in Figure 3. The rotor 16 is driven in the direction of the arrow 34. The cutting edges 16d of the rotor 16 in this case attack via the circumference the deposits, for example the stenoses, and break these up. The cutting edges 14d of the stator portion 14a achieve a shearing action in conjunction with the cutting edges 16d of the rotor, with the sheared-off fragments of the deposits passing into the region of the drive shaft 32 and conveyor screw and being conveyed onwards from there as far as the discharge chamber 18 (Figure 1).
In this representation it should be noted that the external diameter of the rotor 16 is less than 3 mm..
The rotor 16 and the stator 14 are preferably made of metal. The guide wire 24 is a steel wire with nib tip 24c. The drive shaft 32 also serving as conveyor worm or conveyor screw consists of a coated steel wire, for example. The tubular sheath 22 is preferably made of plastic.
For connecting the stator 14 to the tubular sheath 22 in a rotationally fixed manner, the front end 22a of the latter (Figures 2 and 3) is press-fitted into the stator 14, for example. For securing purposes, holes 14e are arranged in the circumferential surface of the stator 14, and the pressed-in tube material 22b swells slightly into said holes 14e.
In the view according to Figure 6, the position of the stator 14 corresponds to that in Figure 3, and the position of the rotor 16 corresponds to that in Figure 2. The slight difference in diameter between the stator portion 14a and the rotor 16 is clearly visible here.
From the longitudinal section according to Figure 7, it can be seen in particular that the drive shaft 32 extends with its front end 32a into the head part 16k of the rotor 16 and is there connected to the latter in a manner fixed in terms of rotation, for example press-fitted into it. It can also be seen how the tubular sheath 22 is secured in the stator 14 via the holes 14e, in a manner fixed in terms of rotation and tensioning.
Figure 8 shows in particular the rectangular cross-section of the wire 32c of the helical drive shaft 32 which at the same time also serves as conveyor worm or conveyor screw. The arrangement of the guide wire 24 coaxially inside the drive shaft 32 results in a particularly high degree of efficacy as conveyor worm or conveyor screw. The dislodged fragments of the deposits are conveyed in a virtually linear manner inside the tubular sheath 22.
Figures 9 and 10 show all the parts already described, but in a perspective representation.

Claims (22)

1. A catheter for detaching abnormal deposits from blood vessels in humans, with a cutting tool which is arranged at its front end and which has a stator and a rotor which can be set in rotation by means of a rotary drive mechanism of a drive unit, which rotor is equipped with a cutting edge within the circumferential surface, and also with a tubular sheath for discharging the deposits which have been detached, characterized in that the rotor surrounds a portion of the stator as external rotor, and in that at least one opposing cutting edge is arranged in the circumferential surface of the stator portion and interacts in a shearing acting with the cutting edge of the rotor.
2. The catheter according to Claim 1, characterized in that the rotor and the portion of the stator are cylindrical, at least in the area of the cutting edges.
3. The catheter according to Claim 1 or 2, characterized in that shearing slots are arranged in the circumferential surfaces of the stator portion and of the rotor, their margins being designed as the cutting edges.
4. The catheter according to Claim 3, characterized in that the stator portion and the rotor have in each case two shearing slots which are offset by 1800 to each other in the circumferential direction.
5. The catheter according to Claim 3 or 4, characterized in that the stator being moved in such a way that the shearing slots arranged in it execute either a slowly revolving or reversible swivel movement about the longitudinal axis of the stator.
6. The catheter according to any one of claims 1 to 5, characterized in that the cutting edges of the stator and of the rotor extend at least approximately in the axial direction.
7. The catheter according to any one of claims 1 to 6, characterized in that the at least one cutting edge of the stator runs in an undulating configuration in the axial direction, relative to a cylindrical surface.
8. The catheter according to any one of claims 1 to 7 characterized in that the cutting edges of the rotor are knife edges.
9. The catheter according to any one of claims 1 to 8, characterized in that the rotor is at least partially tapered in the direction of its front end.
10. The catheter according to Claim 9, characterized in that the rotor has, at its front, means for breaking up loose and solid deposits, for example blood clots.
11. The catheter according to Claim 10, characterized in that the means include one front face and two adjoining bevelled surfaces lying opposite each other, and in that the front face has, on the circumference, forwardly extending projections.
12. The catheter according to any one of claims 1 to 11, characterized in that the stator and/or the rotor are made of metal.
13. The catheter according to any one of claims 1 to 12, characterized in that the stator is connected, in a manner fixed in terms of rotation and tensioning, to the tubular sheath serving as catheter tube.
14. The catheter according to any one of claims 1 to 13, characterized in that the stator is mounted such that it revolves or can swivel to and from about its longitudinal axis.
15. The catheter according to claim 14 characterized in that the stator or the tubular sheath is connected to a swivel drive mechanism whose output speed is substantially below that of the rotary drive mechanism.
16. The catheter according to one of claims 13 to 15, characterized in that the stator is sleeve-like formed and has in its circumferential surface, at its end adjacent to the tubular sheath, at least one hole for anchoring the sheath, which is made of plastic and is press-fitted into the stator, in a manner fixed in terms of rotation and tensioning.
17. The catheter according to any one of claims 1 to 16, characterized in that the rotor is connected to the front end of a flexible drive shaft mounted in the tubular sheath, the rear end of which drive shaft can be connected to the rotary drive mechanism.
18. The catheter according to claim 17, characterized in that the flexible drive shaft is designed as a conveyor worm or conveyor screw and is wound helically in such a way that, in the driven state, it conveys the broken-up deposits in the direction of the drive unit.
19. The catheter according to claim 18, characterized in that a guide wire extends coaxially through the flexible drive shaft designed as conveyor worm or conveyor screw.
20. The catheter according to any one of the claims 1 to 16, characterized in that, inside a flexible drive shaft, a guide wire which is preferably independent of the catheter extends through the said catheter.
21. The catheter according to claim 17 or 18, characterized in that, inside the flexible drive shaft, a guide wire which is preferably independent of the catheter extends through the said catheter.
22. The catheter according to claim 19, characterized in that, inside the flexible drive shaft, the guide wire which is preferably independent of the catheter extends through the said catheter.
CA002213522A 1995-03-28 1996-03-07 Catheter for detaching abnormal deposits in human blood vessels Expired - Lifetime CA2213522C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH87395 1995-03-28
CH00873/95-2 1995-03-28
PCT/CH1996/000085 WO1996029941A1 (en) 1995-03-28 1996-03-07 Catheter for detaching abnormal deposits in human blood vessels

Publications (2)

Publication Number Publication Date
CA2213522A1 CA2213522A1 (en) 1996-10-03
CA2213522C true CA2213522C (en) 2009-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA002213522A Expired - Lifetime CA2213522C (en) 1995-03-28 1996-03-07 Catheter for detaching abnormal deposits in human blood vessels

Country Status (17)

Country Link
US (1) US5873882A (en)
EP (1) EP0817594B1 (en)
JP (1) JP3733487B2 (en)
AT (1) ATE218303T1 (en)
AU (1) AU713141B2 (en)
BR (1) BR9607836A (en)
CA (1) CA2213522C (en)
CZ (1) CZ287327B6 (en)
DE (1) DE59609303D1 (en)
DK (1) DK0817594T3 (en)
ES (1) ES2174056T3 (en)
IL (1) IL117522A (en)
NO (1) NO323635B1 (en)
RU (1) RU2170059C2 (en)
TW (1) TW374732B (en)
WO (1) WO1996029941A1 (en)
ZA (1) ZA962259B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2509538C2 (en) * 2009-05-14 2014-03-20 ТАЙКО ХЕЛСКЕА ГРУП эЛПи Cleanable atherectomy catheters and methods for using them

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WO1996029941A1 (en) 1996-10-03
NO974354D0 (en) 1997-09-22
ES2174056T3 (en) 2002-11-01
ATE218303T1 (en) 2002-06-15
CZ287327B6 (en) 2000-10-11
CZ303497A3 (en) 1997-12-17
NO974354L (en) 1997-09-22
RU2170059C2 (en) 2001-07-10
NO323635B1 (en) 2007-06-18
ZA962259B (en) 1997-09-22
JP3733487B2 (en) 2006-01-11
IL117522A0 (en) 1996-07-23
DE59609303D1 (en) 2002-07-11
AU713141B2 (en) 1999-11-25
JPH11506358A (en) 1999-06-08
EP0817594A1 (en) 1998-01-14
BR9607836A (en) 1998-06-16
DK0817594T3 (en) 2002-07-15
TW374732B (en) 1999-11-21
IL117522A (en) 2000-08-13
US5873882A (en) 1999-02-23
AU4782496A (en) 1996-10-16
CA2213522A1 (en) 1996-10-03
EP0817594B1 (en) 2002-06-05

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