Abstract: A catheter insertion device includes a hollow needle connected to a needle base. A spring mechanically engages between the needle base and a plunger. A catheter slides over the hollow needle. An expandable chamber is in fluidic and/or pneumatic communication with a channel of the hollow needle. A first button is movably attached to a housing. A catheter carrier assembly slides over the hollow needle having a spring clip carrier and a multifunction spring clip. A middle of the multifunction spring clip is attached to the spring clip carrier. A spring clip distal end is opposite a spring clip proximal end and are configured to resiliently flex. The spring clip proximal end has a second button and a catch. The catch is configured to removably secure to a protrusion in the stored state. The second button is configured to release the catch from the protrusion.

Abstract: A catheter insertion device includes a hollow needle attached to a needle base. A compression spring mechanically biases the needle base away from a plunger. A catheter is configured to be contactable by the plunger when the plunger moves in a forward direction. An expandable chamber is in fluidic and/or pneumatic communication with the hollow needle. The plunger inserts the catheter when a vacuum formed in the expandable chamber by the compression spring pushing the plunger away from the needle base is released by a fluid and/or a gas entering the hollow needle at a distal skin-piercing end as it punctures a vein or artery. A generally hollow housing includes an annularly-shaped seal relief formed as an inside surface where in a stored position a second circumferential seal captured by the plunger is not in contact with the inside surface of the generally hollow housing.

Abstract: A catheter insertion device includes a hollow needle attached to a needle base. A compression spring mechanically biases the needle base away from a plunger. A catheter is configured to be contactable by the plunger when the plunger moves in a forward direction. An expandable chamber is in fluidic and/or pneumatic communication with the hollow needle. The plunger inserts the catheter when a vacuum formed in the expandable chamber by the compression spring pushing the plunger away from the needle base is released by a fluid and/or a gas entering the hollow needle at a distal skin-piercing end as it punctures a vein or artery. The plunger is moved from a stored position to the armed position by rotating a button which overcomes any tendency for the plunger to stick in place during storage. The needle can be retracted by the same compression spring after the catheter is inserted.