Tissue resecting system

摘要

A surgical system includes a first instrument defining a first channel and a second instrument receivable by the first channel. The second instrument defines a second channel. A valve coupled to the first instrument controls fluid flow through the first channel, such that impedance of fluid flow through the first channel is substantially the same without the second instrument received in the first channel and with the first channel partially blocked by the second instrument. In another aspect, a surgical apparatus includes an outer member and an inner member received within the outer member to define a first channel therebetween. The inner member houses an optical lens and defines a second channel for receiving a surgical instrument. The first and second channels are configured such that a pump having an inflow rate of up to about 0.7 L/min connected to the second channel can maintain fluid pressure inside an organ.

主权项

1. A surgical system comprising: a first instrument defining a fluid flow channel; a second instrument receivable by the first instrument fluid flow channel; and a valve coupled to the first instrument fluid flow channel to control fluid flow through the first instrument fluid flow channel; wherein the valve includes a housing and a body moveable within the housing, the body defining an opening and being moveable within the housing between a first position in which the opening is not aligned with the first instrument fluid flow channel, and a second position in which the opening is aligned with the first instrument fluid flow channel, and wherein the opening provides a first predefined impedance to fluid flow through the valve when the body is in the first position and the opening provides a second predefined impedance to fluid flow through the valve when the body is in the second position, and wherein fluid is permitted to flow through the opening defined by the body of the valve to and through the first instrument fluid flow channel when the body is in the first position and when the body is in the second position.