Injector device with force lock-out and injection rate limiting mechanisms

• US 20060229570A1
• Filed: 04/11/2005
• Published: 10/12/2006
• Est. Priority Date: 09/11/2002
• Status: Active Grant

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Easterbrook, William, Lovell, John, Chelak, Todd M., West, Robert E., Browka, Edward P., Follman, Mark A.
• Granted Patent: US 9,486,581 B2
• Time in Patent Office: Days
• US Class Current: 604/218
• CPC Class Codes: A61M 2005/2013 triggering of discharging means by contact of injector with patient body
• 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 5/28 Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle
• CPC Class Codes: A61M 5/315 Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/31561 using freely adjustable volume steps
• CPC Class Codes: A61M 5/31571 Means preventing accidental administration for automatic syringes A61M5/20
• CPC Class Codes: A61M 5/3158 performed by axially moving actuator operated by user, e.g. an injection button
• CPC Class Codes: A61M 5/31593 Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir
• CPC Class Codes: A61M 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• CPC Class Codes: A61M 5/46 having means for controlling depth of insertion

Abstract

An injectable substance delivery device comprising a pen device body, a cartridge, a plunger, a drive mechanism, and at least one of a lock-out mechanism and a rate-limiting mechanism. The lock-out mechanism is provided through a ratchet engagement between the body and the plunger to restrict plunger movement and to ensure that the required needle puncture depth is realized prior to injection by locking out the injection mechanism from advancing until a specified force is applied to the skin. A rate-limiting mechanism is also provided through a user compressed plunger drive spring to ensure that a specific rate of injection is realized during the injection of a medicament.

Claims

1. An injection device, comprising:

a main body extending between distal and proximal ends;

an outer sleeve having an inner bore, wherein said main body is slidably engaged with said outer sleeve;

a plunger slidably engaged with said main body;

a lock-out mechanism for engagement between said outer sleeve and said plunger to restrict a linear movement of said plunger until a specified force is applied to said main body; and

a rate-limiting mechanism for engagement between said outer sleeve and said plunger to control an advancement of said plunger.

2. The injection device of claim 1, wherein said lock-out mechanism comprises:

at least one ratchet arm, wherein said at least one ratchet arm is disposed on said outer sleeve and protrudes into said bore of said outer sleeve; and

a plurality of integral ratchet teeth disposed on said plunger for engagement with said at least one ratchet arm, wherein said engagement between said plurality of integral ratchet teeth and said at least one ratchet arm restricts a linear movement of said plunger.

3. The injection device of claim 2, wherein said engagement between said plurality of integral ratchet teeth and said at least one ratchet arm comprises a threaded engagement.

4. The injection device of claim 3, wherein said plunger further comprises a plunger knob for rotating said plunger.

5. The injection device of claim 4, wherein said threaded engagement allows a linear movement of said plunger when said plunger is rotated.

6. The injection device of claim 2, wherein said main body further comprises an engagement portion to deflect said at least one ratchet arm when said specified force is applied to said main body.

7. The injection device of claim 6, wherein said deflection disengages said at least one ratchet arm from said plurality of integral ratchet teeth disposed on said plunger and allows said advancement of said plunger.

8. The injection device of claim 7, wherein said lock-out mechanism further comprises a lock-out spring disposed between said main body and said outer sleeve to compress as said specified force is applied to said main body.

9. The injection device of claim 8, wherein said lock-out spring substantially determines said specified force required to disengage said lock-out mechanism.

10. The injection device of claim 5, wherein said rate-limiting mechanism comprises a rate-limiting spring disposed between said plunger and said outer sleeve, wherein said rate-limiting spring is compressed through said linear movement of said plunger when said plunger is rotated.

11. The injection device of claim 10, wherein said compressed rate-limiting spring substantially determines an advancement rate of said plunger.

12. The injection device of claim 1, further comprising an intradermal pen needle for penetrating a skin surface to inject a content into an intradermal tissue space.

13. The injection device of claim 1, further comprising an integral needle stop for setting a desired depth for penetrating a skin surface.

14. The injection device of claim 13, further comprising a visual indicator for indicating when the specified force has been achieved.

15. The injection device of claim 1, further comprising a medicament cartridge for administering a dosage of medication.

16. An injection device, comprising:

a main body extending between distal and proximal ends;

an outer sleeve having an inner bore, wherein said main body is slidably engaged with said outer sleeve;

a plunger slidably engaged with said main body; and

a lock-out mechanism for engagement between said outer sleeve and said plunger to restrict a linear movement of said plunger until a specified force is applied to said main body.

17. The injection device of claim 16, wherein said lock-out mechanism comprises:

at least one ratchet arm, wherein said at least one ratchet arm is disposed on said outer sleeve and protrudes into said bore of said outer sleeve; and

a plurality of integral ratchet teeth disposed on said plunger for engagement with said at least one ratchet arm, wherein said engagement between said plurality of integral ratchet teeth and said at least one ratchet arm restricts a linear movement of said plunger.

18. The injection device of claim 17, wherein said main body further comprises:

an engagement portion to deflect said at least one ratchet arm when said specified force is applied to said main body, wherein said deflection disengages said at least one ratchet arm from said plurality of integral ratchet teeth disposed on said plunger and allows an advancement of said plunger.

19. The injection device of claim 17, wherein said lock-out mechanism further comprises a lock-out spring disposed between said main body and said outer sleeve to compress as said specified force is applied to said main body.

20. The injection device of claim 17, wherein said engagement between said plurality of integral ratchet teeth and said at least one ratchet arm comprises a threaded engagement.

21. The injection device of claim 20, wherein said plunger further comprises a plunger knob for rotating said plunger and creating a linear movement of said plunger.

22. The injection device of claim 21, further comprising a rate-limiting mechanism for engagement between said outer sleeve and said plunger to control an advancement of said plunger.

23. The injection device of claim 22, wherein said rate-limiting mechanism comprises a rate-limiting spring disposed between said plunger and said outer sleeve, wherein said rate-limiting spring is compressed through said linear movement of said plunger when said plunger is rotated.

24. A method for injecting medication, comprising the steps of:

dialing in a desired measure dosage of medication;

preventing injection until a specified force is applied against a skin surface; and

limiting a rate of injection of said desired measure dosage of medication once said specified force is applied against said skin surface.

25. The method of claim 24, wherein the dialing in step further comprises the step of rotating a rate-limiting mechanism to set said desired measure dosage of medication and to set said rate of injection.

26. The method of claim 24, wherein the preventing injection step further comprises the step of activating a releasable lock-out mechanism by applying said specified force against said skin surface.