Dose indicating injection pen
First Claim
1. A syringe for containing a liquid to be injected including means for selectively adjusting the amount of liquid to be injected and means for indicating the amount selected comprising:
- a syringe housing having a proximal and a distal end, a piston movable within the housing to expel the liquid, and a plunger rod having a first end in contact with the piston for exerting a force on the piston;
a first element and a second element coupled respectively to the syringe housing and the plunger rod and adapted for calibrated movement with respect to each other, one of the first and second elements including an outer portion having a dose-indicating scale thereon, and another of the first and second elements comprising means surrounding said outer portion including a window through which only a segment of the dose-indicating scale on said portion is visible, the visible segment indicating the amount of liquid selected for injection.
1 Assignment
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Accused Products
Abstract
Two embodiments of a multi-dose syringe both include structure for indicating the selected amount of liquid to be injected. A first element and a second element coupled respectively to the syringe housing and the plunger rod are adapted for calibrated movement with respect to each other, one of the first and second elements includes an outer portion having dose-indicating scale thereon, and another of the first and second elements surrounding said outer portion includes a window through which only a segment of the dose-indicating scale on said portion is visible, the visible portion indicating the amount of liquid selected for injection.
209 Citations
15 Claims
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1. A syringe for containing a liquid to be injected including means for selectively adjusting the amount of liquid to be injected and means for indicating the amount selected comprising:
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a syringe housing having a proximal and a distal end, a piston movable within the housing to expel the liquid, and a plunger rod having a first end in contact with the piston for exerting a force on the piston; a first element and a second element coupled respectively to the syringe housing and the plunger rod and adapted for calibrated movement with respect to each other, one of the first and second elements including an outer portion having a dose-indicating scale thereon, and another of the first and second elements comprising means surrounding said outer portion including a window through which only a segment of the dose-indicating scale on said portion is visible, the visible segment indicating the amount of liquid selected for injection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A syringe for containing a liquid to be injected including means for selectively adjusting the amount of liquid to be injected and means for indicating the amount selected comprising:
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a syringe housing, a piston movable within the syringe housing to expel the liquid, and a plunger rod having a first end in contact with the piston for exerting a force on the piston; a hollow cap enveloping a second end of the plunger rod end opposite the first end including means for calibrated adjustment of the cap relative to the plunger, an outer portion of the cap having a dose-indicating scale thereon for indicating calibrated movement of the cap with respect to the plunger rod; and a collar surrounding a distal end of the hollow cap and adapter for calibrated movement with respect thereto, rotatably coupled to the syringe housing, the collar including a window through which only a segment of the dose-indicating scale on said portion of the cap is visible, the visible portion indicating the amount of liquid selected for injection. - View Dependent Claims (11, 12, 13, 14)
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15. A syringe for containing a liquid to be injected including means for selectively adjusting the amount of liquid to be injected and means for indicating the amount selected comprising:
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a syringe housing, a needle assembly coupled to a distal end of the syringe housing, a piston movable within the housing to expel liquid from the housing through the needle, a plunger rod having a non-circular cross-section and a distal end in contact with the piston for exerting a force on the piston, an interior surface of the syringe housing having a non-circular opening corresponding generally to the cross-section of the plunger rod for preventing rotation of the plunger rod with respect to the housing, and means engaging a surface of the plunger rod for preventing movement of the plunger rod away from the needle assembly; a first element and a second element coupled respectively to the syringe housing and the plunger rod and adapted for calibrated movement with respect to each other, one of the first and second elements including an outer portion having dose-indicating scale thereon, and another of the first and second elements comprising means surrounding said outer portion including a window through which only a segment of the dose-indicating scale on said portion is visible, the visible portion indicating the amount of liquid selected for injection.
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Specification