Abstract: Indwelling needle includes a cylindrical body, a needle having a sharp edge at a tip thereof, a cylindrical hub retaining proximal end of needle and moveable along main body, a protective cover moveable along main body and projecting from main body, and a spring elastically installed between hub and protective cover. First engaging portion of actuating lever is provided on body engaged with first projection of protective cover and second through-hole in hub to allow first retention mechanism to retain indwelling needle in a use state. First engaging portion is moved upward to release first retention mechanism. This separates protective cover and hub from each other under elastic force of spring. Protective cover and hub are thus retained in a housed state by second retention mechanism and third retention mechanism, respectively. This configuration reduces length of member contacting patient in the use state.

Abstract: Indwelling needle composed of a body having a closed end, a needle forming at the tip a sharp edge, a tubular hub retaining the proximal end of the needle and slidable along the main body, a protective cover slidable along the main body and projecting from the main body, and a spring elastically fitted between the body and the protective cover. When a first projection is lifted by actuating a lever provided on the body and retractable along with the protective cover relative to the body, the first projection is housed in a through hole and presses a second projection of the protective cover engaged with a second engaging portion toward the inner circumference, rendering an operative state. The resultant length of indwelling needle in operative state can be modified, inhibiting injury to patient.

Abstract: An indwelling needle 1 is constituted by a body 3 having a closed end, a needle 4 with which a sharp edge 4a is formed at the tip, a tubular hub 5 retaining the proximal end of the needle 4 while sliding along the main body 3, a protective cover 6 sliding along the main body 3 while projecting from the main body 3 in a left direction of the drawings, and a spring 7 elastically fitted between the body and the protective cover. When a first projection 23b is lifted by operating an actuating lever 23 provided on the body to be retracted along with the protective cover relative to the body, the first projection 23b is housed in a through hole 14 and presses a second projection 31 of the protective cover engaged with a second engaging portion 13b toward the inner circumference, so that a use state of the protective cover and the body is released and the protective cover is projected from the body by elastic force of the spring.

Abstract: An indwelling needle 1 is composed of a cylindrical body 3, a needle 4 having a sharp edge 4a at a tip thereof, a cylindrical hub 5 which retains a proximal end of the needle 4 and which advances and retracts along the main body 3, and a protective cover 6 which advances and retracts along the main body 3 to project leftward, in the drawings, from the main body 3, and a spring 7 elastically installed between the hub 5 and the protective cover 6. A first engaging portion 11b of an actuating lever 11 provided on the body is engaged with a first projection 6a of the protective cover and a second through-hole 22b in the hub to allow a first retention mechanism A to retain the indwelling needle in a use state. The first engaging portion is moved upward to release the first retention mechanism. This separates the protective cover and the hub from each other under the elastic force of a spring.