Needle safety systems

A tissue access device having a device longitudinal axis, the device comprising:

• a needle having a needle proximal end and a needle distal end;
• a housing having a housing opening and a housing conduit, wherein the housing conduit extends from a housing proximal end to a housing distal end;
• a deformable membrane, wherein the deformable membrane defines a portion of the housing conduit;
• and
• a movable footplate having a footplate proximal end, a footplate distal end, a footplate first surface, a spring, and an occluder, wherein the footplate is attached to the housing,
• wherein the spring is biased to move the moveable footplate from a footplate first configuration to a footplate second configuration when a force applied by the footplate first surface against a non-footplate surface changes from a first force to a second force less than the first force,
• wherein at least a first portion of the occluder occludes the housing conduit when the movable footplate is in the footplate second configuration,
• wherein at least a second portion of the occluder is in the housing opening when the movable footplate is in the footplate second configuration and outside the housing opening when the movable footplate is in the footplate first configuration, and
• wherein the footplate distal end comprises a barrier configured to prevent over insertion of the needle into a vessel, and wherein at least a portion of the barrier is closer to the needle when the moveable footplate is in the footplate first configuration than when the moveable footplate is in the footplate second configuration.

A vessel access device having a device longitudinal axis, the device comprising:

• a needle having a needle proximal end and a needle distal end;
• a housing having a housing opening and a housing conduit, wherein the housing conduit extends from a housing proximal end to a housing distal end;
• a deformable membrane, wherein the deformable membrane defines a portion of the housing conduit;
• and
• a movable footplate having a footplate proximal end, a footplate distal end, a footplate first surface, a spring, and an occluder, wherein the footplate is attached to the housing,
• wherein the spring is biased to move the moveable footplate from a footplate first configuration to a footplate second configuration when a force applied by the footplate first surface against a non-footplate surface changes from a first force to a second force less than the first force,
• wherein at least a first portion of the occluder occludes the housing conduit when the movable footplate is in the footplate second configuration,
• wherein at least a second portion of the occluder is in the housing opening when the movable footplate is in the footplate second configuration and outside the housing opening when the movable footplate is in the footplate first configuration, and
• wherein the footplate distal end has a curved surface configured to reduce friction against the non-footplate surface when the needle is inserted into a vessel, and wherein at least a portion of the curved surface is closer to the needle when the moveable footplate is in the footplate first configuration than when the moveable footplate is in the footplate second configuration.