Sterilizable indwelling catheters
According to an aspect of the invention, an indwelling catheter is provided which comprises a catheter shaft. The catheter either comprises a light source or is adapted to receive light from a light source, and is configured such that light is transmitted from the light source into the catheter shaft. Moreover, the catheter shaft is formed of a polymeric material that transmits a quantity of light from the light source that is effective to inactivate microorganisms on a surface of the catheter shaft upon activation of the light source. For example, the light may inactivate the microorganisms directly or in conjunction with a photosensitizer. According to another aspect of the invention, a sterilization method is provided, which comprises activating the light source while the catheter is inserted in a subject.
1. A method of sterilizing a catheter, comprising:
introducing a catheter comprising a catheter shaft into a patient;
wherein the catheter shaft projects from a hub;
wherein the hub includes a lumen contiguous with a lumen of the catheter shaft;
wherein a light source is receivable within the lumen of the hub and configured to transmit light onto a proximal end of the catheter shaft;
wherein the catheter shaft is formed of a polymeric material that transmits a quantity of light through the catheter shaft that is effective to inactivate microorganisms on an external surface along a length of the catheter shaft;
introducing, with the catheter shaft within the patient, the light source into the lumen of the hub and proximal to the lumen of the catheter shaft; and
activating the light source while the light source remains proximal to the lumen of the catheter shaft and the catheter is within the patient.
2. The method of claim 1 , further comprising introducing a photosensitizer to the patient prior to or concurrent with activating the light source.
3. The method of claim 1 , wherein the catheter further comprises a photosensitizer.
4. The method of claim 3 , wherein the photosensitizer is a coating on the catheter shaft.
5. The method of claim 3 , wherein the photosensitizer is a dye.
6. The method of claim 3 , wherein the photosensitizer is selected from thiazine dyes, acridine dyes, coumarin dyes, xanthene dyes, phenoxaziniums, phenazines, aromatic carbonyl compounds, condensed aromatic compounds, fluorene derivatives, psoralens, naphthalocyanines, porphyrin, thioketones and combinations thereof.
7. The method of claim 1 , wherein the catheter shaft comprises a thermoplastic or a thermoset polymer material.
8. The method of claim 1 , wherein the catheter shaft comprises a polymer material selected from polycarbonates, acrylic polymers, polystyrenes, polyethylene terephthalates, polyamides, polyurethanes, polyether block amides, fluoropolymers, and combinations thereof.
9. The method of claim 1 , wherein the light source is selected from a laser, a laser array, a light emitting diode, and a light emitting diode array.
10. A method of sterilizing a catheter, comprising:
introducing a catheter into a patient, the catheter including a catheter shaft with a catheter shaft lumen and a hub with a hub lumen, the catheter shaft projecting from a distal end of the hub and comprising a light transmitting material, the hub lumen configured to receive a light source;
introducing, with the catheter within the patient, the light source into the hub lumen and proximal to the catheter shaft lumen, the light source configured to transmit light into the catheter shaft;
activating the light source while the catheter shaft lumen of the catheter shaft remains unobstructed by the light source and the catheter is within the patient; and
transmitting an effective quantity of light from the light source through the catheter shaft to inactivate microorganisms on an external surface along a length of the catheter shaft.
11. The method of claim 10 , wherein the catheter is configured such that light is transmitted from the light source into the lumen of the catheter shaft.
12. The method of claim 10 , wherein the catheter is configured such that light is transmitted through a wall of the catheter shaft.
13. The method of claim 10 , wherein the light source is selected from a laser, a laser array, a light emitting diode, and a light emitting diode array.
14. The method of claim 10 , wherein the catheter is an indwelling catheter.
15. The method of claim 10 , further comprising introducing a photosensitizer to the patient prior to or concurrent with activating the light source.
16. The method of claim 10 , wherein the catheter further comprises a photosensitizer.