US 6,203,526 B1Granted

Apparatus for preventing loss of a composition during a medical procedure

AssigneeDirect Therapeutics, Inc.

InventorsDean M. McBeth, Vincent DeCrescito, Richard Kronenthal

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Abstract

In a method and apparatus for delivering a composition to a targeted area of tissue, exposure of a non-targeted tissue to the composition is minimized. The apparatus has at least one needle-like shaft which is inserted through a track in the non-targeted tissue to deliver the composition to the targeted tissue through an opening in the shaft. The track may be a naturally occurring lumen in a tissue, such as a vascular lumen, or may be a track created surgically by a diagnostic instrument, or by the needle-like shaft of the present apparatus. A valve-like mechanism closes the opening in the shaft to prevent premature delivery of the composition during insertion of the shaft, and to prevent loss of composition during withdrawal of the shaft. The valve-like mechanism also prevents excessive delivery of the composition to targeted tissue. An annular dam is mounted on an exterior portion of the shaft near the opening. When the opening in the shaft has been suitably positioned in the targeted tissue, the dam is radially expanded to prevent quantities of composition intended for delivery to the targeted tissue from flowing away from the targeted tissue along the track though which the shaft is inserted.

An apparatus for delivering a composition to a target area of a tissue, the apparatus traversing a track in the tissue, the apparatus comprising:

an elongate tubular inner member having a proximal end, a distal end and a lumen extending from the proximal end to the distal end of the inner member, said lumen adapted to receive a fluid at the proximal end of the inner member, and means for delivering said fluid from the distal end of the inner member to the target tissue by way of the lumen;
an elongate tubular central member having a proximal end, a distal end and a lumen extending from said central member proximal end to said central member distal end, said tubular inner member being coaxially positioned in said lumen of said central member;
an elongate tubular outer member having a proximal end, a distal end, lumen extending from said outer member proximal end to said outer member distal end, said tubular central member being coaxially located in said lumen of said outer member;
and
means for inhibiting a migration of said composition along the track from said target area comprising a selectively, radially expandable sleeve biased toward a radially expanded position when the apparatus is stationary in said tissue, is sufficiently radially compressible to permit movement of said apparatus in said tissue, wherein said radially expandable sleeve has a proximal end and a distal end, said proximal end and distal ends being restrained from expanding, and said proximal end and distal end are separated by an expandable portion having a predetermined length and wherein the proximal end of the sleeve is engaged by the distal end of the outer member and the distal end of the sleeve is engaged by the distal end of central member and, wherein movement of said central member relative to the outer member causes a reduction in a distance between said proximal and distal ends of said sleeve so that said expandable portion of said sleeve expands radially outward.

2 more elements

Facts

Application

09/138,025Filed 21 Aug 1998 · us provisional application

Priority

22 Aug 1997

Granted

20 Mar 2001

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

A61M 25/04
Holding devices, e.g. on the body: in the body, e.g. expansible
A61B 17/3415
Trocars; Puncturing needles: for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters
A61B 2017/3488
Anchoring means, e.g. spreading-out umbrella-like structure: fixation to inner organ or inner body tissue
A61M
Devices for delivering substances into the body

Abstract

Claims30