End of dose indicator

• US 5,391,157 A
• Filed: 10/20/1992
• Issued: 02/21/1995
• Est. Priority Date: 10/20/1992
• Status: Expired due to Fees

• Current Assignee: Eli Lilly and Company
• Original Assignee: Eli Lilly and Company
• Inventors: Ploof, John S., Harris, Dale C.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): Alexander, V.
• Application Number:
  US07/963,801
• Time in Patent Office: 854 Days
• Field of Search: 604/65-66, 604/100, 604/118, 604/207-208, 604/186, 604/189, 604/169, 604/210-211, 604/260, 604/409, 604/28, 604/232, 221/2, 221/3, 222/23, 222/39, 222/41, 222/46, 222/402.13
• US Class Current: 604/208
• CPC Class Codes: A61M 2205/581 by audible feedback
• 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 5/31525 Dosing burettes, pipettes B01L3/02
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/3157 Means providing feedback signals when administration is completed A61M5/20 takes precedence
• CPC Class Codes: A61M 5/3158 performed by axially moving actuator operated by user, e.g. an injection button

Abstract

The present invention provides an improvement in injection syringes by providing for an end of dose indicator which is operatively associated with the dose knob of an injection syringe. The instant end of dose indicator works by providing a sound as an indication that the complete dose has been administered.

Claims

1. An injection syringe having a dose knob and an end of dose indicator which is adapted to fit into said dose knob, wherein said end of dose indicator comprises:

a) top section

b) resilient legs perpendicularly dependent from the top section wherein the resilient legs have a means for cooperating with and retaining the resilient legs in a predetermined position in the dose knob as pressure is applied to the top section until the end of the dose and at the end of the dose are released from the predetermined position causing a sound;

c) means for returning the resilient legs to the predetermined position in the dose knob when pressure is released from the top section.

2. The syringe of claim 1 wherein the means for returning the resilient legs to the predetermined position is one or more curved legs which depend perpendicularly from the top section of the end of dose indicator and cooperate with the dose knob to return the resilient legs to the predetermined position when the dose is completed and pressure is removed from the top section.

3. The syringe of claim 2 where there are three equally spaced resilient legs with a curved leg in the space between the resilient legs.

4. The syringe of claim 3 wherein the resilient legs have a ridge on the outer surface which cooperates with a ledge within the dose knob to retain the resilient legs in the predetermined position until the end of the dose when the ridge is dislodged from the ledge to cause a sound.

5. The syringe of claim 4 wherein the curved legs cooperate with a second ridge within the dose knob to return the resilient legs to the predetermined position when the pressure is released from the top section after the dose is injected.