Intravenous catheter insertion device and method of use
A catheter insertion device with a housing and an interior space. An access needle and a guide wire supported by and moveable relative to the access needle. A restraining element attached to a handle to limit the motion of the guide wire relative to the access needle. A catheter insertion device with a housing and an interior space. An access needle and a guide wire channel attached to the access needle. A guide wire supported by the guide wire channel. A handle attached to the guide wire to move the guide wire relative to the guide wire support channel. A method of introducing a catheter into a vessel by inserting a guide wire substantially contained within a housing into a vessel. Next, advance a catheter over the guide wire and into the vessel. Next, withdraw the guide wire out of the vessel and completely into the housing.
1. A method for accessing a blood vessel lumen, comprising:
providing a catheter insertion device having an access needle, a catheter disposed coaxially over the access needle and a guidewire disposed in a lumen of the access needle and having a distal tip preformed into a coil configuration,
wherein the coil configuration:
has a coil width (cw) and a coil span (cs), and
comprises a preformed spiral including a plurality of turns, the plurality of turns including adjacent turns in different planes;
advancing the access needle through a patient's skin to position a distal tip of the access needle in the blood vessel lumen;
advancing the guidewire from the distal tip of the access needle into the blood vessel lumen, wherein the distal tip of the guidewire is maintained in a straightened configuration in the access needle and recovers the coil configuration in the blood vessel lumen, and wherein the distal tip of the guidewire inhibits puncturing or damaging a wall of the blood vessel, as the guidewire is advanced; and
advancing the catheter over the guidewire.
2. The method according to claim 1 , wherein the blood vessel lumen has a diameter and the distal tip of the guidewire has a diameter which is less than that of the lumen of the blood vessel lumen.
3. The method according to claim 1 , wherein advancing the catheter over the guidewire comprises advancing the catheter over the distal tip of the guidewire to straighten the distal tip of the guidewire.
4. The method according to claim 1 , further comprising retracting the guidewire into the access needle, wherein the distal tip of the guidewire transitions from the coil configuration to the straightened configuration during the retracting step.
5. The method according to claim 1 , wherein the distal tip of the guidewire comprises a super elastic alloy.
6. The method according to claim 1 , wherein the coil configuration includes a first coil extending from a straight portion of the guidewire, the first coil lying substantially in a first coil plane.
7. The method according to claim 1 , wherein the coil width (cw) is in a range from about 0.04 inches to about 0.05 inches, and wherein the coil span (cs) is less than 0.015 inches.
8. The method according to claim 1 , wherein the guidewire has a first diameter region, a taper or transition region, and a second diameter region formed into the coil configuration.