Flashback ventilation cap
First Claim
1. A ventilation cap for use with a medical device having insertion means for at least partial insertion into a liquid flow passage of a patient and communication of the liquid between the flow passage and the exterior of the patient, said insertion means including a hollow tube and flashback chamber means in liquid flow connection with said hollow tube for receiving a quantity of the patient'"'"'s liquid to indicate proper placement of the medical device in the patient, said cap comprising:
- a hollow elongate body having a proximal end opening and a distal end opening,means for attachment of said body to the medical device with said distal end opening in liquid communication with said flashback chamber means and with said body exterior of the patient,ventilation means positioned in said proximal end opening of said hollow elongate body for allowing passage of air and inhibiting passage of liquid from the interior of the medical device to the exterior of the body, andmeans for destroying said means for attachment.
4 Assignments
0 Petitions
Accused Products
Abstract
A ventilation cap for a flashback chamber is formed of a hollow elongate cylindrical body of polymeric material and includes a proximal opening which is blocked by a venting material such as a hydrophobic filter, and a distal opening which is sized to allow an extension of the flashback chamber to be inserted therein for airtight connection therewith. The elongate body of the ventilation cap has a tear strip formed therein by a pair of generally parallel score lines. The cap is affixed to the flashback chamber so as to allow air to pass from the flashback chamber through the vent as blood fills the flashback chamber, while preventing blood from passing through the vent. When it is desired to attach other apparatus to the extension of the flashback chamber, the tear strip, which may have a pull tab integrally formed therewith, is torn away from the elongate body to destroy the airtight seal between the flashback extension and the cap. Once the tear strip has been pulled away from the body of the cap, the cap can be easily removed from the extension without the creation of vacuum forces which would tend to cause spillage of blood from the flashback chamber.
60 Citations
20 Claims
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1. A ventilation cap for use with a medical device having insertion means for at least partial insertion into a liquid flow passage of a patient and communication of the liquid between the flow passage and the exterior of the patient, said insertion means including a hollow tube and flashback chamber means in liquid flow connection with said hollow tube for receiving a quantity of the patient'"'"'s liquid to indicate proper placement of the medical device in the patient, said cap comprising:
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a hollow elongate body having a proximal end opening and a distal end opening, means for attachment of said body to the medical device with said distal end opening in liquid communication with said flashback chamber means and with said body exterior of the patient, ventilation means positioned in said proximal end opening of said hollow elongate body for allowing passage of air and inhibiting passage of liquid from the interior of the medical device to the exterior of the body, and means for destroying said means for attachment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20)
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10. A medical device having insertion means for at least partial insertion into a liquid flow passage of a patient to pass liquid therefrom to the exterior of the patient, said insertion means including a hollow tube, said device comprising:
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flashback chamber means in liquid flow connection with said hollow tube for receiving a quantity of the patient'"'"'s liquid, to indicate proper placement of the medical device in the patient, a ventilation cap having a hollow elongate body with a proximal end opening and a distal end opening, the distal end opening having means for attachment of said cap to said flashback chamber means and in liquid communication therewith and with the cap exterior of the patient, and the proximal end opening having ventilation means provided therein for allowing passage of air and inhibiting passage of liquid from the flashback chamber means to the exterior of the ventilation cap, and means for destroying said means for attachment. - View Dependent Claims (11, 12, 13)
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Specification