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Publication Number
US-10813579-B2
Publication Date
2020-10-27
Expiration Date
Abstract
The application relates to a blood collection device comprising: a cannula hub defining a chamber; an in-let cannula defining an axis and having a distal end and a lumen extending therethrough, the inlet cannula being mounted to the cannula hub such that the distal end of the inlet cannula is external of the cannula hub and such that the lumen through the inlet cannula communicates with the chamber; an outlet cannula having a proximal end and a lumen extending therethrough, the outlet cannula being mounted to the cannula hub such that the proximal end of the outlet cannula is external of the cannula hub and such that the lumen of the outlet cannula communicates with the chamber; a closed sleeve mounted over a portion of the outlet cannula disposed externally of the cannula hub; and a venting mechanism providing communication between the chamber and ambient surroundings.
Core Innovation
The disclosure describes a blood collection device with a cannula hub that defines a chamber, referred to as a flashback chamber. A cannula is mounted to the cannula hub such that a proximal and distal end are external to the cannula hub, while the cannula lumen communicates with the chamber by means of an opening. The device includes a closed sleeve mounted over a portion of the cannula disposed externally of the cannula hub.
The device further includes a venting mechanism providing communication between the chamber and ambient surroundings. The venting mechanism comprises a tubular insert defining a fluid passage and a membrane extending across the fluid passage, where the membrane is made from a material permeable for air and substantially impermeable for blood. The tubular insert is received in a tubular projection extending from the cannula hub so that an end of the tubular insert facing towards the flashback chamber abuts on an inner collar when the tubular insert is fully inserted.
The cannula hub is formed from first and second parts, with the first part comprising a grip portion and a tubular portion extending proximal in the direction of the cannula axis. The second part is of tubular shape and partly received in the tubular portion of the first part by means of a press fit. The disclosure also describes cannula configurations with either separate inlet/outlet cannulas or an integral single cannula having an opening for communication with the flashback chamber.
Claims Coverage
The document includes one independent claim with multiple dependent claims. The independent claim covers five inventive features in a blood collection device architecture combining a flashback chamber, a closed sleeve, a venting membrane, a specific vent insert mounting with inner collar abutment, and a multi-part cannula hub assembled by press fit.
Flashback chamber with cannula lumen communication via opening
A blood collection device comprising a cannula hub defining a chamber and a cannula mounted to the cannula hub such that a lumen through the cannula communicates with the chamber by means of an opening.
Closed sleeve over external portion of cannula
The blood collection device further comprising a closed sleeve mounted over a portion of the cannula disposed externally of the cannula hub.
Venting mechanism with air-permeable and blood-impermeable membrane across fluid passage
A venting mechanism providing communication between the chamber and ambient surroundings, the venting mechanism comprising a tubular insert defining a fluid passage and a membrane extending across the fluid passage, wherein the membrane is made from a material permeable for air and substantially impermeable for blood.
Tubular insert received in tubular projection with inner collar abutment at full insertion
The tubular insert is received in a tubular projection extending from the cannula hub such that an end of the tubular insert facing towards the flashback chamber abuts on an inner collar when the tubular insert is fully inserted into the tubular projection.
Cannula hub formed from first and second parts connected by press fit
The cannula hub is formed from first and second parts, wherein the first part comprises a grip portion and a tubular portion extending proximal therefrom in a direction of the cannula axis, and the second part is of tubular shape and partly received in the tubular portion of the first part by means of a press fit.
Overall, the claim coverage centers on a blood collection device that combines a cannula hub defining a flashback chamber, a closed sleeve, and a venting mechanism using a membrane that is permeable for air and substantially impermeable for blood. The venting mechanism is implemented with a tubular insert received in a tubular projection with inner collar abutment, and the cannula hub is constructed from first and second parts assembled by press fit.
Stated Advantages
Enables rapid flashback for reliable venipuncture detection.
Documented Applications
Venipuncture detection using rapid flashback.
Blood collection device configurations including separate inlet/outlet cannulas or an integral single cannula having an opening for communication with the flashback chamber.
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