Expanding plunger rods for syringes
First Claim
1. An expanding plunger rod for a syringe, the expanding plunger rod configured to transition from a packaged configuration for packaging to an expanded configuration for operation, the expanding plunger rod comprising:
- a substantially cylindrical outer sleeve having a closed-off bottom end and an open upper end;
an inner sleeve having a lower end and an upper end, the inner sleeve being slidably disposed coaxially within the outer sleeve; and
an inner rod having a lower end and an upper end, the inner rod being slidably disposed coaxially within the inner sleeve;
wherein, in the packaged configuration, the inner rod is nested within the inner sleeve, and the inner sleeve is nested within the outer sleeve, the lower end of the inner rod resting against the closed-off bottom end of the outer sleeve, the outer sleeve including a pull-back lockout tab configured to prevent removal of the outer sleeve from a barrel of the syringe; and
wherein, in the expanded configuration, the upper end of the inner sleeve and the lower end of the inner rod are disposed substantially axially above the open upper end of outer sleeve, and the inner rod is configured to lock axially in place so as to prevent transition from the expanded configuration to the packaged configuration.
4 Assignments
0 Petitions
Accused Products
Abstract
An expanding plunger rod for a syringe is configured to transition from a packaged configuration to an expanded configuration for operation. The rod includes a substantially cylindrical outer sleeve having a closed-off bottom end and an open upper end, and an inner rod having a lower end and an upper end. The inner rod is slidably disposed coaxially within the outer sleeve. In the packaged configuration, the inner rod is nested within the outer sleeve. In the expanded configuration, the inner rod is disposed substantially axially above the outer sleeve, and the inner rod locks axially in place to prevent transition from the expanded to the packaged configuration.
9 Citations
11 Claims
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1. An expanding plunger rod for a syringe, the expanding plunger rod configured to transition from a packaged configuration for packaging to an expanded configuration for operation, the expanding plunger rod comprising:
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a substantially cylindrical outer sleeve having a closed-off bottom end and an open upper end; an inner sleeve having a lower end and an upper end, the inner sleeve being slidably disposed coaxially within the outer sleeve; and an inner rod having a lower end and an upper end, the inner rod being slidably disposed coaxially within the inner sleeve; wherein, in the packaged configuration, the inner rod is nested within the inner sleeve, and the inner sleeve is nested within the outer sleeve, the lower end of the inner rod resting against the closed-off bottom end of the outer sleeve, the outer sleeve including a pull-back lockout tab configured to prevent removal of the outer sleeve from a barrel of the syringe; and wherein, in the expanded configuration, the upper end of the inner sleeve and the lower end of the inner rod are disposed substantially axially above the open upper end of outer sleeve, and the inner rod is configured to lock axially in place so as to prevent transition from the expanded configuration to the packaged configuration. - View Dependent Claims (2, 3, 4)
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5. A syringe assembly configured to transition from a packaged configuration for packaging to an expanded configuration for operation, the syringe assembly comprising:
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a substantially cylindrical barrel having a plunger end and a connection end; a plunger seal disposed within the plunger end of the barrel; a needle seal disposed within the connection end of the barrel; a fluid compartment defined within the barrel between the plunger seal and the needle seal; and an expanding plunger rod comprising; a substantially cylindrical outer sleeve having a closed-off bottom end connected to the plunger seal, and an open upper end, an inner sleeve having a lower end and an upper end, the inner sleeve being slidably disposed coaxially within the outer sleeve, and an inner rod having a lower end and an upper end, the inner rod being slidably disposed coaxially within the inner sleeve; wherein, in the packaged configuration, the inner sleeve and the inner rod are both nested within the outer sleeve, the lower end of the inner rod resting against the closed-off bottom end of the outer sleeve, the outer sleeve including a stop mechanism configured to engage with the barrel so as to prevent the expanding plunger rod from being removed from the barrel; and wherein, in the expanded configuration, the upper end of the inner sleeve and the lower end of the inner rod are both disposed axially above the open upper end of the outer sleeve, and the inner sleeve and inner rod are configured to lock axially in place so as to prevent transition from the expanded configuration to the packaged configuration. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification