Patent US5419333A successfully refreshed from Google Patents.
US5419333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic doppler blood flow meter apparatus
Assignee: Konica Minolta Inc
•
Filing: 1994-02-28
•
Granted: 1995-05-30
•
Expires: 2014-02-28
Abstract
Abstract An ultrasonic Doppler blood flow meter apparatus includes a wall filter for eliminating clutter from an echo signal of an ultrasonic pulse signal sent to a living being under test. The wall filter includes a switch for cutting a part of input data and a control unit for controlling the switch such that the switch is opened during a period in which first m data (where m is integer) is inputted to undergo filtering by the wall filter while the switch is closed during a period in which data following the (m+1)-th data inclusive thereof are inputted.
Inventors
- 👤 Hisashi Hagiwara
- 👤 Hiroshi Fukukita
- 👤 Morio Nishigaki
- 👤 Yoshihiko Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:34
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/06; G; G01; G01S; G01S15/00; G01S15/88; G01S15/89; G01S15/8906; G01S15/8979; G01S15/8981
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
An ultrasonic Doppler blood flow meter apparatus, comprising: a wall filter for eliminating clutter from an echo signal of an ultrasonic pulse signal sent to a living being under test; said wall filter having a switch for removing a part of input data; and control means for controlling opening and closing of said switch such that said switch is opened during a period in which first m data (where m is integer) are inputted to undergo filtering by said wall filter, and said switch is closed during a period in which data following the (m+1)-th data, inclusive thereof, are inputted to undergo filtering by said wall filter.
Claim 2
Dependent Claim
107 words
An ultrasonic Doppler blood flow meter apparatus, comprising: a wall filter for eliminating clutter from an echo signal of an ultrasonic pulse signal sent to a living being under test; said wall filter having a switch for removing a part of input data; and control means for controlling opening and closing of said switch such that said switch is opened during a period in which first m data (where m is integer) are inputted to undergo filtering by said wall filter, and said switch is closed during a period in which data following the (m+1)-th data, inclusive thereof, are inputted to undergo filtering by said wall filter.
Claim 3
Dependent Claim
125 words
An ultrasonic Doppler blood flow meter apparatus according to claim 1, wherein said wall filter further includes a first filter provided at the data input side and having a characteristic given by the Z-transformation (1-Z -1 ) and a second filter provided at the data output side, said first filter being connected to said second filter by way of said switch, and wherein said control means controls said switch such that said switch is opened during a period in which initial data of an input data train originating for a particular location of the living being under test are inputted to said first filter while said switch is closed during a period in which data following the initial data are inputted to said first filter.
Claim 4
Dependent Claim
53 words
An ultrasonic Doppler blood flow meter apparatus according to claim 1, wherein said wall filter further comprises a filter, operatively associated with an output of said switch, comprising a data register for eliminating unwanted signal components of low frequencies, said data register being cleared to zero in response to said switch being opened.
Claim 5
Dependent Claim
114 words
A filtering system for an ultrasonic Doppler blood flow meter apparatus, said filtering apparatus comprising: a wall filter for eliminating clutter from an echo signal of an ultrasonic pulse signal sent to a living being under test; said wall filter having a switch for removing a part of input data; and control means for controlling opening and closing of said switch such that said switch is opened during a period in which first m data (where m is integer) are inputted to undergo filtering by said wall filter, and said switch is closed during a period in which data following the (m+1)-th data, inclusive thereof, are inputted to undergo filtering by said wall filter.
Claim 6
Dependent Claim
114 words
A filtering system for an ultrasonic Doppler blood flow meter apparatus, said filtering apparatus comprising: a wall filter for eliminating clutter from an echo signal of an ultrasonic pulse signal sent to a living being under test; said wall filter having a switch for removing a part of input data; and control means for controlling opening and closing of said switch such that said switch is opened during a period in which first m data (where m is integer) are inputted to undergo filtering by said wall filter, and said switch is closed during a period in which data following the (m+1)-th data, inclusive thereof, are inputted to undergo filtering by said wall filter.
Claim 7
Dependent Claim
121 words
A filtering apparatus according to claim 4, wherein said wall filter further includes a first filter provided at the data input side and having a characteristic given by the Z-transformation (1-Z -1 ) and a second filter provided at the data output side, said first filter being connected to said second filter by way of said switch, and wherein said control means controls said switch such that said switch is opened during a period in which initial data of an input data train originating for a particular location of the living being under test are inputted to said first filter while said switch is closed during a period in which data following the initial data are inputted to said first filter.
Claim 8
Dependent Claim
49 words
A filtering apparatus according to claim 4, wherein said wall filter further comprises a filter, operatively associated with an output of said switch, comprising a data register for eliminating unwanted signal components of low frequencies, said data register being cleared to zero in response to said switch being opened.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-05-29 | 1998-11-28 | 1999-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-29 | 2002-11-28 | 2003-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-29 | 2006-11-28 | 2007-05-30 | $7700.00 | Window Closed / Lapsed |