초록 ▼

This invention relates to a hydrostatic float valve for use in a fluid feed system that is capable of automatically shutting off the flow of fluid to a body cavity of a patient whenever additional or more rapid flow of said fluid would harm said patient and also relates to a fluid delivery system of

This invention relates to a hydrostatic float valve for use in a fluid feed system that is capable of automatically shutting off the flow of fluid to a body cavity of a patient whenever additional or more rapid flow of said fluid would harm said patient and also relates to a fluid delivery system of the intravenous type that incorporates said hydrostatic float valve.

대표청구항 ▼

A system for supplying fluid to a patient at a controlled rate of fluid flow and to stop said flow automatically when said flow rate becomes uncontrolled comprising a valve chamber, means to deliver said fluid at a controlled rate to said valve chamber, a valve seat fixed in position within said val

A system for supplying fluid to a patient at a controlled rate of fluid flow and to stop said flow automatically when said flow rate becomes uncontrolled comprising a valve chamber, means to deliver said fluid at a controlled rate to said valve chamber, a valve seat fixed in position within said valve chamber to separate said valve chamber into an upper chamber portion and a lower chamber portion, a valve extending through said valve seat and movable relative thereto, primary tubing communicating with said lower chamber portion to deliver said fluid by gravity from said valve chamber to a catheter constructed and arranged for insertion into the body cavity of a patient, and manual valve means constructed and arranged to cooperate with said primary tubing to form a closed portion of said fluid feeding system between said valve seat and said manual valve means when said manual valve means is closed, characterized by the fact that said lower chamber portion is flexible to develop a back pressure against gravity when said flexible lower chamber portion is pinched while said manual valve means is closed, said valve has a specific gravity slightly more than that of said fluid but less than the combination of the buoyant force of said fluid and said back pressure against gravity that develops when said flexible lower portion is pinched to lift said valve from said valve seat by said combination when said back pressure is sufficiently great and to maintain said valve spaced from said valve seat as long as said back pressure is sufficiently great and to allow said valve to lower onto said valve seat when a net outflow of fluid from the closed portion of said system reduces said back pressure sufficiently until said combination of buoyancy and said reduced back pressure is so small that said valve lowers by gravity to engage said valve seat.