EP0934729A1
Expired / Lapsed
EP
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Apparatus for tissue excision and removal by fluid jet
Assignee: Bayer Medical Care Inc
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Filing: 1999-02-04
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Granted: —
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Expires: 2019-02-04
Abstract
Abstract A surgical device and method for removal of tissue, such as thrombus, from a vessel in the body. The device has a first tube with a distal open end and an inward directed stop and a second tube with an outward directed stop for engaging the inward directed stop and thereby regulating the relationship between a retrograde jet and the distal open end. Thrombus is dislodged, entrained, and broken into pieces which are evacuated through the first tube. <IMAGE>
Inventors
- 👤 John Edward Morris
- 👤 Cindy M. Setum
- 👤 William J. Drasler
- 👤 Hieu V. Le
- 👤 Robert G. Dutcher
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 00:34
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3203; A61B17/32037; A61B17/3205; A61B17/3207; A61B17/32075; A61B17/22; A61B2017/22038; A61B2017/22045; A61B90/00; A61B90/03; A61B2090/033; A61B2090/034
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
A catheter for removing tissue from a body
cavity comprising: a. an outer assembly including (1) a first tube having a lumen with an open
distal end and an internally located
stationary stop partially obstructing
said lumen at said open distal end, said
lumen being of a diameter sufficient to
allow passage of a guidewire; and, b. an inner assembly including (1) a second tube having a high pressure
lumen having a distal end, said distal
end having an orifice; (2) a transitional stop fixed to said second
tube adjacent to said distal end; and, (3) a jet cap positioned at said distal end
for directing a jet of saline exiting
said orifice toward said open distal end
of said first tube, said second tube
being movable axially within said first
tube such that said transitional stop
engages said stationary stop to hold said
jet cap in a desired relationship with
respect to said open distal end of said
first tube.
Claim 2
Dependent Claim
184 words
A catheter for removing thrombus or other body
tissue from an obstructed body vessel or body cavity
comprising: a. an outer assembly including (1) an evacuation tube having a proximal end
and an open distal end containing a
stationary stop and having an evacuation
lumen that is of a diameter sufficient to
allow passage of a standard coronary or
interventional neuroradiological
guidewire; and, b. an inner assembly including (1) a high pressure tube having a high
pressure lumen, said high pressure tube
having a proximal end and a distal end,
said distal end having one or more
orifices through which saline can exit
from said high pressure lumen to be
directed toward said open distal end of
said evacuation tube; (2) a transitional stop fixed to said high
pressure tube at a position closer to
said distal end than to said proximal
end; and, (3) a jet cap positioned at said distal end
of said high pressure tube, said jet cap
coacting with said high pressure tube to
direct one or more jets of saline toward
said open distal end of said evacuation
tube.
Claim 3
Dependent Claim
44 words
The catheter of Claim 1 or 2, wherein said jet cap has a
distal end and said distal end of said jet cap has a guidewire
coil attached thereto to allow advancement of said outer assembly
and said inner assembly together within the vasculature.
Claim 4
Dependent Claim
37 words
The catheter of Claim 1, 2 or 3, wherein said jet cap is
configured to create a jet of saline of an annular shape and to
direct it toward said open distal end of said evacuation tube.
Claim 5
Dependent Claim
26 words
The catheter of any of Claims 1 to 4, wherein said
evacuation tube is flexible and can pass over a standard
guidewire through tortuous vascular pathways.
Claim 6
Independent Claim
172 words
A method of removing thrombus from an
obstructed body vessel comprising the steps of: a. providing a guidewire and a first catheter
having a distal end and an internally located
stationary stop positioned adjacent to the
distal end; b. advancing the guidewire to a vascular site
containing thrombus; c. advancing the first catheter over the
guidewire to the vascular site containing
thrombus to position the distal end at the
vascular site; d. removing the guidewire from the first
catheter; e. providing a second catheter carrying a jet cap
and a transitional stop spaced apart from the
jet cap; f. advancing the second catheter within the first
catheter to engage the transitional stop with
the stationary stop; and, g. providing a high pressure saline supply to the
second catheter so as to cause a jet of saline
to emanate from the jet cap and to entrain the
thrombus and on the distal end of the first
catheter, thereby dislodging thrombus and
entraining thrombus into the saline jet and
thence into the first catheter.
Claim 7
Dependent Claim
46 words
The method of claim 6, wherein the jet cap
carries a distally projecting coil to facilitate further
distal advancement of the first catheter and the second
catheter together within the vasculature to a further vascular
site containing thrombus so as to remove additional distally
situated thrombus.
Claim 8
Dependent Claim
184 words
A catheter combination comprising: a. a first tube having an open distal end and a
lumen extending to the open distal end; b. a second tube, separable from the first tube,
and insertable within the lumen of the first
tube, the second tube having a distal end and
a lumen extending to the distal end; c. a jet cap connected to the second tube at the
distal end of the second tube for directing
fluid exiting the lumen of the second tube,
the jet cap being capable of passage through
the lumen of the first tube and being
characterized by the ability to provide a
localized region of low pressure associated
with a liquid flow directed generally
proximally and into the lumen of the first
tube through the open distal end of the first
tube, when the jet cap is located and oriented
appropriately relative to the open distal end
of the first tube; and, d. means for indexing an appropriate positional
relationship of the jet cap and distal end of
the second tube relative to the open distal
end of the first tube.
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