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CA2425865A1 - Drainage unit with controlled negativity relief feature - Google Patents

Drainage unit with controlled negativity relief feature Download PDF

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Publication number
CA2425865A1
CA2425865A1 CA002425865A CA2425865A CA2425865A1 CA 2425865 A1 CA2425865 A1 CA 2425865A1 CA 002425865 A CA002425865 A CA 002425865A CA 2425865 A CA2425865 A CA 2425865A CA 2425865 A1 CA2425865 A1 CA 2425865A1
Authority
CA
Canada
Prior art keywords
water
chamber
seal chamber
water seal
column
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002425865A
Other languages
French (fr)
Other versions
CA2425865C (en
Inventor
David R. Swisher
Eugene E. Weilbacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covidien AG
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/481,237 external-priority patent/US5743894A/en
Application filed by Individual filed Critical Individual
Priority claimed from CA002223744A external-priority patent/CA2223744C/en
Publication of CA2425865A1 publication Critical patent/CA2425865A1/en
Application granted granted Critical
Publication of CA2425865C publication Critical patent/CA2425865C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The present invention provides for an improved airflow sensitive float valve interposed between the collection chamber and one arm of the water seal chamber for allowing the patient to draw as much vacuum pressure as is required during deep inspiration. The float valve also functions to provide for an automatic controlled release of excess negative pressure in the collection chamber during either continuous auto-transfusion or when there is a low airflow rate condition present. By tailoring a specific amount of water to a given size chamber, the water column inside the water seal chamber is allowed to momentarily engage the floating mechanism before the water seal chamber is emptied of water, and a column of air is subsequently forced through the water column towards the momentarily sealed valve.
CA002425865A 1995-06-07 1996-06-07 Drainage unit with controlled negativity relief feature Expired - Lifetime CA2425865C (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
US08/481,237 1995-06-07
US08/481,237 US5743894A (en) 1995-06-07 1995-06-07 Spike port with integrated two way valve access
US1288896P 1996-03-05 1996-03-05
US60/012,888 1996-03-05
US1792196P 1996-05-07 1996-05-07
US60/017,921 1996-05-07
US1937996P 1996-06-05 1996-06-05
US60/019,379 1996-06-05
CA002223744A CA2223744C (en) 1995-06-07 1996-06-07 Drainage unit with controlled negativity relief feature

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002223744A Division CA2223744C (en) 1995-06-07 1996-06-07 Drainage unit with controlled negativity relief feature

Publications (2)

Publication Number Publication Date
CA2425865A1 true CA2425865A1 (en) 1996-12-19
CA2425865C CA2425865C (en) 2006-05-23

Family

ID=27508644

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002425865A Expired - Lifetime CA2425865C (en) 1995-06-07 1996-06-07 Drainage unit with controlled negativity relief feature

Country Status (1)

Country Link
CA (1) CA2425865C (en)

Also Published As

Publication number Publication date
CA2425865C (en) 2006-05-23

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MKEX Expiry

Effective date: 20160607