Syringe with multifunctional plunger handle
Inventors
Assignees
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Publication Number
US-12539369-B2
Publication Date
2026-02-03
Expiration Date
Abstract
A medical syringe useful for administering an injection or withdrawing a bodily fluid, the syringe comprising a barrel, plunger assembly and a needle assembly having a selectively retractable needle, the plunger assembly further comprising a plunger handle with a plunger seal and a front tip extending forwardly of the plunger seal to extend through the barrel and into the an annular fluid seal disposed in a recess between the barrel and a forwardly projecting needle, thereby reducing dead space inside the syringe and helping anchor the annular fluid seal inside the recess.
Core Innovation
The medical syringe has a plunger tip with a first cylindrical portion and a smaller-diameter second cylindrical portion. When the plunger is fully advanced, the tip extends through successively narrower portions of the fluid pathway and into the annular seal. The plunger tip and plunger seal are configured to reduce dead space ahead of the plunger seal or, for bodily-fluid withdrawal, to reduce air entrainment and air-bubble formation.
The described syringe supports infusion of medicinal fluid and withdrawal of bodily fluid. Reduced dead space helps limit air-bubble formation and conserve medication during operation. In addition, the smaller-diameter portion helps retain the annular seal during lateral repositioning of the needle assembly.
Claims Coverage
The claim coverage includes three inventive features across claims 1, 14, and 16, directed to a medical syringe with a stepped plunger tip that enters portions of the fluid pathway and annular seal.
Stepped plunger tip extending into the annular seal
Claim 1 covers a barrel, chamber luer, annular seal, needle assembly, and plunger assembly. The smaller-diameter second cylindrical portion of the front tip extends through the chamber-luer fluid pathway and into the fluid pathway through the annular seal when the plunger is fully advanced, thereby reducing dead space inside the syringe ahead of the plunger seal.
Dead-space reduction in an infusion syringe
Claim 14 covers a syringe useful for infusing medicinal fluid into a patient or a port in a fluid delivery system. Its plunger tip extends through the nose, chamber luer, and annular fluid seal; the plunger tip and plunger seal displace sufficient fluid to reduce dead space compared with a syringe without the plunger tip.
Reduced air entrainment during bodily-fluid withdrawal
Claim 16 covers a syringe useful for withdrawing bodily fluid from a patient. Its stepped plunger tip extends through portions of the fluid pathway, including the annular fluid seal, and is configured with the plunger seal to reduce air entrainment and air-bubble formation during withdrawal compared with a syringe without the plunger tip.
The three inventive features center on a stepped plunger tip extending into narrower fluid-pathway portions and the annular seal to reduce dead space for infusion or decrease air entrainment during bodily-fluid withdrawal.
Stated Advantages
The stepped plunger tip reduces dead space inside the syringe ahead of the plunger seal.
Reduced dead space helps conserve medication and limit air-bubble formation.
During bodily-fluid withdrawal, the plunger tip and plunger seal reduce air entrainment and air-bubble formation compared with a syringe without the plunger tip.
The smaller-diameter portion helps retain the annular seal during lateral repositioning of the needle assembly.
Documented Applications
Infusion of medicinal fluid into a patient or a port in a fluid delivery system.
Withdrawal of bodily fluid from a patient.
Blood collection is described in connection with an optional barrel-wall coating.
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