Surgery – Means for introducing or removing material from body for...
Patent
1999-02-24
2000-07-04
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
604118, 604131, A61M 100
Patent
active
060831898
DESCRIPTION:
BRIEF SUMMARY
The purpose of the generator-dispenser is to deliver a liquid, particularly a sterile liquid, at a constant, regulable pressure or at a constant, regulable flow.
One adaptation of the invention delivers sterilized liquid under sterile conditions such as those required in medical applications.
The generator consists of a flexible container placed in a chamber where a predetermined pressure is exerted by an inert, gaseous fluid, preferably a fluid that is immiscible with the liquid in the flexible container. The pressurized gas expels the liquid through a connection piece and a conduit terminating in a hand piece.
BACKGROUND OF THE INVENTION
There are various medical procedures, such as, for example aquadissection, injecting medication or contrast substances, cleansing or lavage of a deep area , disinfecting, and so forth, which must be performed using high pressure.
The pressurized liquid expelled through the end of the hand piece initially needs to be under sufficient pressure from the compression gas, but also requires a high pressure type conduit connecting it with the hand piece and a calibrated outlet opening with a shape and diameter corresponding to the type of spray used for the designated application.
Publication WO 94/28807 of SAPHIR MEDICAL concerns a surgical aquadissection apparatus formed of a physiological serum generator contained in a pouch under pressure in a chamber sealed with pressurized gas and connected to a hand piece by a flexible conduit, which in turn is connected to a circuit leading from the pouch through a sterile pin, penetrating one of the chamber walls through a cone-shaped seal.
A circuit terminating in a hand piece is connected to a suction pump for suctioning the liquid and evacuating fragments tissue produced during the aquadissection procedure.
This invention has a single objective: providing a generator for use in surgical dissection which emits a spray of sterile liquid.
To achieve this objective, the physiological serum must be projected at high pressure that can be regulated manually by the operator.
This is accomplished by maintaining a constant pressure, or incision pressure, at the outlet of the hand piece. An electronic regulating circuit maintains constant pressure in the sealed chamber. As a result, the incision pressure is consistently maintained at the optimal level for the surgery being performed.
Other inventions concerning generators of this type are Publication No.
EP 0 411 170, and U.S. Pat. No. 4,913,698 ITO. These concern the production of a concentrated, high pressure spray for performing aquadissection.
However, there are other instances, such as medical, surgical, and related applications, where the use of high pressure is not advisable. This is the case for pulverization, rinsing, spraying, humidifying, contact disinfection, impregnation, or irrigation with a stream of liquid.
These other applications require a different type of generator, as the procedures require that the liquid not be produced using pressure. On the contrary, a low pressure stream of liquid is desired.
One illustration of a flow generator can be found in Publication No. WO 94/27659 filed by GUIGNARD.
This physiological liquid generator also consists of a pouch holding the liquid, with the pouch subjected to propelling pressure in a sealed chamber. The pressure source is a bottle of neutral gas under pressure. The gas pressure is stringently regulated by a pressure sensor and regulator. A safety valve is adjusted to 30 kPa, or 0.3 bars. This low pressure is appropriate for an endoscopy procedure. It is actually possible to inject only low pressure liquids into the human body.
However, this generator delivers a large volume of liquid, as it also supplies a clarifying liquid for improving visibility in the surgical field. Of course, this liquid is evacuated to eliminate abnormal organ swelling and diffusion of the liquid throughout the body, and a peristaltic extraction pump is provided for this purpose.
This generator has limited pressure and cannot be used in procedures where
REFERENCES:
patent: 2669233 (1954-02-01), Friend
patent: 3963024 (1976-06-01), Goldowsky
patent: 4457487 (1984-07-01), Steigerwald
patent: 4662871 (1987-05-01), Rafelson
patent: 4913698 (1990-04-01), Ito et al.
Japanese Abstract, vol. 013, No. 105 (C-575) dated Mar. 13, 1989 to Sugino Mach:KK and JP 63279832.
Gonon Bertrand
Sezeur Alain
Saphir Medical
Yasko John D.
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