Surgery – Instruments – Heat application
Reexamination Certificate
1997-09-02
2001-05-01
Dvorak, Linda C. M. (Department: 3739)
Surgery
Instruments
Heat application
C607S096000, C607S104000, C607S105000, C607S113000
Reexamination Certificate
active
06224591
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for hyperthermia treatment, viz. treatment of body tissues of different kinds under the supply of heat in connection with some deceases.
2. Description of the Related Art
Hyperthermia treatment is described in detail in WO-A-93/05737. This publication describes also a device for hyperthermia treatment in a body cavity, e.g. uterus, comprising a catheter with a distal portion to be introduced into the body cavity. In said distal portion the catheter has an elastic enclosure having an inlet for the supply of pressurized liquid in order to expand said elastic enclosure so that it forms a balloon filling the body cavity. In the catheter there is provided inside the elastic enclosure a heating element for heating the liquid in the balloon by the liquid by means of pressure shocks being circulated in the balloon in heat transferring contact with the heating element. The liquid inlet also serves as an outlet for the liquid when it shall be drained off in order that the elastic enclosure shall contract around the catheter after the treatment having been made. A similar device is described in U.S. Pat. No. 4,949,718.
WO-A-93/21846 discloses a device for hyperthermia treatment which also comprises a member on a catheter to be introduced into a body cavity, said member being expanded in the body cavity by the supply of liquid or gas. In this case the heating is effected by means of electromagnetic waves.
A device for hyperthermia treatment in a body cavity is described also in U.S. Pat. No. 5,084,044 comprising a catheter to be introduced into the body cavity and having two parallel passages to be connected each to an associated liquid conduit in the proximal end of the catheter, and an expandable space defined by an elastically extendable element at the distal end of the catheter said passages opening into said space, means for circulating pressurized liquid through said space via the passages, said element being extended by the liquid as a balloon in the body cavity in engagement with the wall thereof, and external heating means for heating the circulating liquid.
SUMMARY OF THE INVENTION
The invention relates to a device of the kind described in U.S. Pat. No. 5,084,044 for hyperthermia treatment of the endometrium of the uterus, and to a method for such treatment.
One object of the invention is to facilitate the introduction and the correct localization of the catheter in the uterus.
Another object of the invention is to provide a device of the kind referred to which provides protection of the vagina during the treatment.
A further object is to provide a device of the kind referred to which provides for rapid discharge of the pressurized liquid outside vagina if the balloon should rupture during the treatment.
A still further object is to provide a device of the kind referred to which can be easily tested as to the function thereof before the catheter is introduced into the uterus.
It is also an object of the invention to make possible to adjust the size of the balloon to the size of the uterus.
A still another object of the invention is to provide a method allowing supply of pressurized liquid to the catheter at an accurately controlled temperature.
Said objects and additional objects of the invention are achieved by a device for hypertermia treatment of the endometrium of uterus, comprising a catheter to be introduced into uterus and forming two passages to be connected each to an associated liquid conduit in the proximal end of the catheter, an elastically expandable smooth hose piece enclosing the catheter at the distal end thereof said hose piece being sealingly connected to the catheter at both ends thereof to define an expandable space around the catheter said passages opening into said space through side apertures, means for circulating pressurized liquid through said space via the passages to expand said hose piece by the pressurized liquid as a balloon, external heating means for heating the circulating liquid, and a socket open for fluid flow therethrough at both ends thereof which is axially displacable on the catheter said socket at the distal end thereof forming an abutment to be engaged with cervix when the catheter is introduced into uterus.
The invention also provides a method for hyperthermia treatment of the endometrium of uterus, comprising the steps of introducing through vagina and the cervical canal a balloon catheter into uterus, circulating pressurized liquid through the catheter to expand the balloon into engagement with the endometrium, and externally heating the circulating liquid.
In a preferred embodiment of the method a socket open at both ends is provided for axial displacement on said catheter for determining the probe measure and for discharging liquid to a site outside the vagina in case of rupture of the balloon.
Further objects and details of the invention will be apparent from the following description of embodiments of the invention with reference to the accompanying drawings.
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Derwent's abstract No. 93-358287/45, week 9345, Abstract of SU 1771725-A1 (Tvetmetavtomatika Urals Branch) Oct. 30, 1992.
Claren Jan
Redvall Lars
ATOS Medical AB
Dvorak Linda C. M.
Merchant & Gould P.C.
Ruddy David M.
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