Abstract: A trocar is used by inserting a distal end thereof into a body cavity of a patient. The trocar includes: an inner tube that has a center pipeline; an outer tube that is disposed so as to cover an outer periphery of the inner tube and has a front end that is positioned rearward of a front end of the inner tube; an annular channel that is formed between the inner tube and the outer tube and has an ejection port at the front end position of the outer tube; and a flow control member that is provided on the inner tube at a position forward of the front end of the outer tube and facing the ejection port, the flow control member having an inclined surface located at the rear end that slants radially outward.

Abstract: The present invention provides an operation field-securing device that secures an operation field by being deployed within the body cavity. The operation field-securing device includes at least three elongated parts extending radially in a deployed state; and curved parts, the number of which is the same as that of the elongated parts. Each pair of the two adjacent elongated parts is connected at their one ends by the curved part. Each of the curved parts is convex toward a side opposite to the elongated part. In the deployed state, the curved parts are arranged circumferentially. By deforming the curved parts, the operation field-securing device is capable of being brought into either one of a contracted state where a distance between the adjacent elongated parts is shortened by making the elongated parts close to each other and the deployed state where the distance between the elongated parts is expanded.

Abstract: The present invention provides an operation field-securing device that secures an operation field by being deployed within the body cavity. The operation field-securing device includes at least three elongated parts extending radially in a deployed state; and curved parts, the number of which is the same as that of the elongated parts. Each pair of the two adjacent elongated parts is connected at their one ends by the curved part. Each of the curved parts is convex toward a side opposite to the elongated part. In the deployed state, the curved parts are arranged circumferentially. By deforming the curved parts, the operation field-securing device is capable of being brought into either one of a contracted state where a distance between the adjacent elongated parts is shortened by making the elongated parts close to each other and the deployed state where the distance between the elongated parts is expanded.