Multiple dose injection pen
First Claim
1. An improved means for adjustment of the dosage of liquid to be injected from a syringe having a housing for receiving a container of liquid, the container of liquid having a closed first end and a piston closing a second end of the container, the housing having a proximal end and a distal end, the distal end being adapted to receive an injection needle assembly for permitting liquid to pass out of the container first end, a plunger rod, having a non-cylindrical cross-section with a first surface, including threads, and a second surface, received within the housing for exerting a force on the piston closing the container second end, the improvement comprising:
- first means received within the housing adjacent the container second end for preventing rotation of the plunger rod in relation to the housing;
second means engaging a second surface of the plunger road for restricting movement of the plunger rod toward the housing proximal end,third means used to adjust the dosage of liquid to be injected from the syringe, which means rotatably engages a first surface of the plunger road for calibrated axial movement with respect to the plunger rod and housing toward the housing proximal end,fourth means fixed with respect to the housing for stopping any movement of the third means toward the housing distal end at a fixed position relative to the housing, andlimit means for limiting the maximum calibrated movement of the third means.
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Accused Products
Abstract
The present invention relates to a hypodermic syringe having the same general appearance as a pen which is specifically adapted to provide for multiple measure injections of materials such as insulin or human growth hormone.
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Citations
29 Claims
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1. An improved means for adjustment of the dosage of liquid to be injected from a syringe having a housing for receiving a container of liquid, the container of liquid having a closed first end and a piston closing a second end of the container, the housing having a proximal end and a distal end, the distal end being adapted to receive an injection needle assembly for permitting liquid to pass out of the container first end, a plunger rod, having a non-cylindrical cross-section with a first surface, including threads, and a second surface, received within the housing for exerting a force on the piston closing the container second end, the improvement comprising:
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first means received within the housing adjacent the container second end for preventing rotation of the plunger rod in relation to the housing; second means engaging a second surface of the plunger road for restricting movement of the plunger rod toward the housing proximal end, third means used to adjust the dosage of liquid to be injected from the syringe, which means rotatably engages a first surface of the plunger road for calibrated axial movement with respect to the plunger rod and housing toward the housing proximal end, fourth means fixed with respect to the housing for stopping any movement of the third means toward the housing distal end at a fixed position relative to the housing, and limit means for limiting the maximum calibrated movement of the third means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A syringe having means for adjustment for the dosage of liquid to be injected comprising:
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a housing for receiving a container of liquid, the container of liquid having a close first end and a piston closing a second end of the container, the housing having a proximal end and a distal end, the distal end being adapted to receive a needle assembly for permitting liquid to pass out of the closed first end of the container, a plunger rod received within the housing for exerting a force on the piston closing the second of the container, the plunger rod having non-cylindrical cross-section, a first surface including threads, and a second surface, a collar received within the housing adjacent the container second end, the collar having a non-cylindrical opening corresponding generally to the cross-section of the plunger rod for preventing rotation of the plunger rod with respect to the housing and engaging means engaging the plunger rod second surface for restricting movement of the plunger rod toward the housing proximal end, a hollow cap enveloping the plunger rod end opposite the container and extending outward from the housing proximal end, the cap having a threaded interior surface rotatably engaging the plunger rod first surface portion for calibrated axial adjustment relative thereto and a distal end facing surface for contacting a stop fixed with respect to the housing upon movement of the cap and plunger rod toward the housing distal end, and a limit means for limiting the maximum calibrated movement of the hollow cap, used to adjust the dosage of liquid to be injected from the syringe. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. In a syringe having a housing for receiving a container of liquid, the housing having a proximal end and a distal end, the distal end being adapted to receive an injection needle assembly for permitting liquid to pass out of the closed first end of the container, an improved means for adjustment of the dosage of liquid to be injected comprising:
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a plunger rod received within the housing for exerting a force on the piston closing the second of the container, the plunger rod having non-cylindrical cross-section, a first surface including threads, and a second surface, a collar received within the housing adjacent the container second end, the collar having a non-cylindrical opening corresponding generally to the cross-section of the plunger rod for preventing rotation of the plunger rod with respect to the housing and engaging means engaging the plunger rod second surface for restricting movement of the plunger rod toward the housing proximal end, a hollow cap enveloping the plunger rod end opposite the container and extending outward from the housing proximal end, the cap having a threaded interior surface rotatably engaging the plunger rod first surface portion for calibrated axial adjustment relative thereto and a distal end facing surface for contacting a stop fixed with respect to the housing upon movement of the cap and plunger rod toward the housing distal end, and threaded portion on an outer surface of the hollow cap and a follower adjustibly positioned on the threaded outer surface portion of the cap to permit variation in the limit of the calibrated movement of the cap with respect to the plunger rod. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification