| 摘要 |
FIELD: medicine. ^ SUBSTANCE: invention refers to medicine. A vitreoretinal surgical system comprises a flow control system to supply first and second fluid mediums when in use into an infusion cannula of the vitreoretinal surgical system. Said flow control system comprises: a first fluid flow source; a second fluid flow source; a switching unit of said flow of said first fluid medium and said flow of said second fluid flow; a first channel for said flow of said first fluid medium, a second channel for said flow of said second fluid flow and a connecting device. Said first channel is an infusion channel for fluid flow. Said second channel is a gas channel for gas flow. The connecting device comprises a first inlet for said first channel; a second inlet for said second channel; an outlet for said first fluid medium or for said second fluid medium for variable connection when in use of the first or second fluid mediums with the infusion cannulas; usually closed return valve and a receiver portion. Said return valve is opened when said switching unit switches said flow of said first fluid medium to said flow of said second fluid medium. The receiver portion has an internal surface precisely adjusted to an external surface of said return valve for minimising when in use air bubble or gas formation in the first fluid medium when the flow of said first fluid medium is supplied into said infusion cannula. ^ EFFECT: invention enables for a vitreoretinal surgeon to make switching between a surgical infusion solution and air or other gas, without resorting to assistance and avoiding potential eye limping caused by fluid flow interruption. ^ 6 cl, 5 dwg |
