Retracting Sheath Detachable Safety Needle with Moving Spring

摘要

A passive safety needle device is disclosed having a housing, a needle hub, a needle cannula, a retractable sheath, a spring to bias the retractable sheath in a distal direction to cover the distal end of the needle cannula, a radial protrusion to cause the spring to move from the proximal spring position to the distal spring position, and a catch to secure the distal end of the spring to the distal end of the housing. The spring may bias the retractable sheath in a distal direction to cover the distal end of the needle cannula. The radial protrusion causes the spring to move from a proximal spring position to the distal spring position towards the catch located at the distal end of the housing.

主权项

1. A safety needle device comprising:
a housing having a proximal end and a distal end having an opening; a needle cannula having a distal end and a proximal end mounted to a needle hub at the proximal end of the housing; a retractable sheath disposed an outer surface on the distal end of the housing surrounding the needle cannula, the retractable sheath having a larger diameter than the housing and having a radially enlarged proximal end defining a proximal spring position and a distal spring position separated by a ledge; a spring to bias the retractable sheath in a distal direction to cover the distal end of the needle cannula, the spring having a distal end; and a radially compressible member at the distal end of the spring having a larger diameter than the proximal end and main body of the spring; and a radial protrusion extending inwardly from the housing to cause the radially compressible member to compress upon an application of force in the proximal direction to allow the spring to move from a proximal position to a distal position so that when the spring is extended, the distal end of the radially compressible member is secured to a catch at the distal end of the housing.