Retractable Injection Port

• US 20080281292A1
• Filed: 07/23/2007
• Published: 11/13/2008
• Est. Priority Date: 10/16/2006
• Status: Abandoned Application

• Current Assignee: Alcon Research Limited (Nestle SA)
• Original Assignee: Alcon Research Limited (Nestle SA)
• Inventors: Hickingbotham, Dyson W., Sanchez, Robert J.
• Application Number:
  US11/781,719
• Publication Number:
  US 20080281292A1
• Time in Patent Office: Days
• US Class Current: 604/521
• CPC Class Codes: A61F 9/0017 implantable in, or in contact with, the eye, e.g. ocular inserts
• CPC Class Codes: A61M 2005/14268 with a reusable and a disposable component
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 2205/3653 by Joule effect, i.e. electric resistance
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/6027 Electric-conductive bridges closing detection circuits, with or without identifying elements, e.g. resistances, zener-diodes
• CPC Class Codes: A61M 2205/8206 battery-operated
• CPC Class Codes: A61M 2210/0612 Eyes
• CPC Class Codes: A61M 5/1413 Modular systems comprising interconnecting elements
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14526 the piston being actuated by fluid pressure
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54
• CPC Class Codes: A61M 5/3129 Syringe barrels A61M5/3205 and A61M5/50 take precedence
• CPC Class Codes: A61M 5/31511 Piston or piston-rod constructions, e.g. connection of piston with piston-rod A61M5/5066 takes precedence
• CPC Class Codes: A61M 5/445 the media being heated in the reservoir, e.g. warming bloodbags

Abstract

A cannula, for delivering a bolus of a pharmaceutically active agent to the posterior chamber of the eye, having an orifice disposed at the distal tip. The cannula is slidably disposed within a hypodermic needle. The sliding action of the cannula within the needle provides a means for trimming a formed bolus of a pharmaceutically active agent from the orifice of the cannula. In addition, the double wall formed by the cannula within the needle provides insulation from the cooler temperatures within the eye to allow for the delivery of phase transition substances.

Claims

1. A retractable injection port comprising:

a hypodermic needle having a sharpened distal tip; and

a cannula, slidably disposed within the needle, the cannula having an orifice disposed at a distal end, the orifice fluidly coupled to a mechanism for delivering a substance;

wherein the needle and the cannula provide insulation to the substance contained therein.

2. The port of claim 1 wherein the orifice is disposed in a side wall of said cannula.

3. The port of claim 1 wherein the distal end of the cannula is rounded.

4. The port of claim 1 wherein the distal end of the cannula is flat.

5. The port of claim 1 wherein the mechanism is a syringe having a heated dispensing chamber.

6. The port of claim 1 wherein the substance comprises a phase transition compound.

7. The port of claim 1 wherein sliding said needle over said orifice trims a bolus of said substance.

8. A retractable injection port comprising:

a cannula having an orifice disposed at a distal tip; and

a hypodermic needle slidably disposed within the cannula.

9. A retractable injection port comprising:

a hypodermic needle having a sharpened distal tip; and

a cannula, slidably disposed within the needle, the cannula having an orifice disposed at a distal end, the orifice fluidly coupled to a syringe having a heated dispensing chamber;

wherein the needle and the cannula provide insulation to a heated phase transition compound.

10. The port of claim 9 wherein the orifice is disposed in a side wall of said cannula.

11. The port of claim 9 wherein the distal end of the cannula is rounded.

12. The port of claim 9 wherein the distal end of the cannula is flat.

13. A method for delivering a substance into an eye comprising the steps of:

providing a retractable injection port having a cannula slidably disposed within a hypodermic needle, said needle disposed at a distal end of a heated syringe;

piercing the sclera of said eye with said hypodermic needle;

partially withdrawing said needle to expose said cannula;

expressing substance into said eye through an orifice disposed at a distal tip of said cannula;

trimming said substance from said cannula by withdrawing said cannula into said needle.

14. The method of claim 13 wherein said orifice is disposed in a side wall of said cannula.

15. The method of claim 13 wherein said orifice is disposed in a distal tip of said cannula.

16. The method of claim 13 wherein said substance comprises a heated phase transition compound.

17. The method of claim 16 wherein said phase transition compound is insulated by said needle and said cannula.