Pneumatically-Powered Ophthalmic Injector
First Claim
1. An ophthalmic injection device comprising:
- a dispensing chamber housing having an inner surface partially defining a dispensing chamber for holding a quantity of a substance;
a plunger engaged with the inner surface of the dispensing chamber housing, the plunger capable of sliding in the dispensing chamber housing, the plunger fluidly sealed to the inner surface of the dispensing chamber housing;
a shaft connected to the plunger; and
a pneumatic mechanism connected to the shaft;
wherein pneumatic pressure introduced into the pneumatic mechanism moves the shaft and plunger in a dispensing direction.
1 Assignment
0 Petitions
Accused Products
Abstract
An ophthalmic injection device has a dispensing chamber housing, a plunger, a shaft connected to the plunger, and a pneumatic cylinder. The dispensing chamber housing has an inner surface partially defining a dispensing chamber for holding a quantity of a substance. The plunger is engaged with the inner surface of the dispensing chamber housing, is capable of sliding in the dispensing chamber housing, and is fluidly sealed to the inner surface of the dispensing chamber housing. The pneumatic cylinder has a piston movable in a chamber. The piston is connected to a shaft. The shaft is connected to the plunger. The shaft has teeth located on its surface. A pawl is engageable with the teeth and limits movement of the shaft to a dispensing direction. Pneumatic pressure introduced into the chamber moves the piston, shaft, and plunger in a dispensing direction.
76 Citations
13 Claims
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1. An ophthalmic injection device comprising:
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a dispensing chamber housing having an inner surface partially defining a dispensing chamber for holding a quantity of a substance; a plunger engaged with the inner surface of the dispensing chamber housing, the plunger capable of sliding in the dispensing chamber housing, the plunger fluidly sealed to the inner surface of the dispensing chamber housing; a shaft connected to the plunger; and a pneumatic mechanism connected to the shaft; wherein pneumatic pressure introduced into the pneumatic mechanism moves the shaft and plunger in a dispensing direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An ophthalmic injection device comprising:
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a dispensing chamber housing having an inner surface partially defining a dispensing chamber for holding a quantity of a substance; a plunger engaged with the inner surface of the dispensing chamber housing, the plunger capable of sliding in the dispensing chamber housing, the plunger fluidly sealed to the inner surface of the dispensing chamber housing; a needle fluidly coupled to the dispensing chamber; a shaft connected to the plunger, the shaft having teeth located on its surface; a pawl engageable with the teeth, the pawl for limiting movement of the shaft to a dispensing direction; a piston connected to the shaft; a chamber, the piston moveable in the chamber; and a port fluidly coupled to the chamber; wherein pneumatic pressure introduced into the chamber moves the piston, shaft, and plunger in the dispensing direction.
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Specification