Patent ID: 8652110
Filing Date: 2014-02-18
Classification: A61M

Abstract:
1. A valve-equipped hand switch comprising: a valve having a main passage with one open end side and other closed end side; a first port in communication with a side portion of a central area of said main passage; a second port in communication with a side portion of said main passage closer to the other end side than said first port of the central area; a third port in communication with the side portion of said main passage closer to the other end side than said second port; a fourth port in communication with the side portion of said main passage closer to the other end side than said second port, and also in communication with said second port; a first plunger fixedly arranged on the other end side in said main passage, for controlling a communicated state and a cutoff state between said third port and said fourth port; a second plunger slidably arranged in a liquid-tight manner in said main passage to divide said main passage into two segments, said one end side and said other end side, and also arranged with an elastic member interposed between itself and said first plunger; a third plunger slidably arranged in a liquid-tight manner in said main passage, on a tip end portion of an operation piston inserted into said main passage through said one end side; a spacer portion having a diameter smaller than an inner diameter of said main passage, and fixed to a side of said third plunger closer to said second plunger; and a detection device provided to operate in conjunction with movement of said operation piston, for detecting a rate of insertion and an amount of insertion movement of said operation piston in said main passage, wherein in an initial state, a communicated state between said third port and said fourth port is selected with said first plunger, and a cutoff state between said first port and said second port is selected with said second plunger, and in an operation state, a communicated state between said first port and said second port is selected by pushing said operation piston toward said other end side of said main passage, causing said spacer portion to oppose an elastic force resulting from compression of said elastic member while abutting said second plunger, to move said second plunger toward said other end side of said main passage, leading said spacer portion to be positioned between said first port and said second port, and a cutoff state between said third port and said fourth port is selected with said first plunger due to said first plunger being pushed by said elastic member.