Dual chamber mixing device for a syringe
First Claim
1. A mixing device for a syringe, said mixing device comprising:
- an inner barrel including an inner chamber,an outer barrel disposed about at least a portion of the inner barrel, the outer barrel including an outer chamber at least partially formed between the inner barrel and the outer barrel,a distal seal disposed within the outer chamber, the distal seal separating the outer chamber into a first mixing substance space disposed proximally to the distal seal and a vented space disposed distally to the distal seal,the outer barrel including at least one vent extending through the outer barrel to fluidly connect the vented space with an exterior of the mixing device, the at least one vent being disposed distally to the distal seal,at least one aperture extending through the inner barrel and opening into the inner and outer chambers,the distal seal being slidably disposed within the outer chamber for movement in a distal direction between a first and a second position, the second position being distal to the first position, wherein movement of the distal seal from the first position to the second position expels air from the vented space in the outer barrel through the at least one vent as a volume of the vented space is reduced.
2 Assignments
0 Petitions
Accused Products
Abstract
A mixing device and a retractable syringe comprising same are provided. The mixing device comprises concentric outer and inner barrels that form an outer chamber, the inner barrel having an inner chamber. A mixing plunger is slidably located in the outer chamber. A seal located in the outer chamber is capable of axial movement, in response to depression of the mixing plunger, from a first position in sealing engagement with one or more apertures in the inner barrel to a second position intermediate the apertures and vents in the outer barrel. This allows depression of the mixing plunger to force a first substance from the outer chamber through the apertures to mix with a second substance in the inner chamber. The mixed substance in the inner barrel is then delivered by the syringe with subsequent needle retraction.
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Citations
14 Claims
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1. A mixing device for a syringe, said mixing device comprising:
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an inner barrel including an inner chamber, an outer barrel disposed about at least a portion of the inner barrel, the outer barrel including an outer chamber at least partially formed between the inner barrel and the outer barrel, a distal seal disposed within the outer chamber, the distal seal separating the outer chamber into a first mixing substance space disposed proximally to the distal seal and a vented space disposed distally to the distal seal, the outer barrel including at least one vent extending through the outer barrel to fluidly connect the vented space with an exterior of the mixing device, the at least one vent being disposed distally to the distal seal, at least one aperture extending through the inner barrel and opening into the inner and outer chambers, the distal seal being slidably disposed within the outer chamber for movement in a distal direction between a first and a second position, the second position being distal to the first position, wherein movement of the distal seal from the first position to the second position expels air from the vented space in the outer barrel through the at least one vent as a volume of the vented space is reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification