Patent US4439186A successfully refreshed from Google Patents.
US4439186A
Expired / Lapsed
US
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Dilation device
Assignee: Individual
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Filing: 1982-08-17
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Granted: 1984-03-27
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Expires: 2002-08-17
Abstract
Abstract A dilation device for dilating or blocking vessels and other body cavities with a catheter having an expandable element. The expandable element is a balloon-type dilation element having a pressure volume relationship which is non-linear. A pressure source is provided which supplies a pulsating pressure to the expandable element for alternating expansion and contraction of said element.
Inventors
- 👤 Adolf Kuhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/10; A61M25/1018; A61M25/10184; A61M25/104; A61M2025/102
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
A dilation device for dilating or closing blood vessels and other body cavities comprising: a catheter having a radially expandable dilation element, said element having a volume-pressure characteristic including a first zone in which the rate of increase in volume with increasing pressure is relatively low, a second zone in which said rate is substantially higher and substantially linear, and an inflection point separating said first and second zones, and a source of fluid pressure connected to said catheter, control means for said fluid pressure source for producing a pulsating pressure between a lower value lying closely below said inflection point and an upper value lying in said second zone, said dilation element having a structure capable of responding to pressure pulses in said pulsating pressure at a frequency of 0.5 to 3 Hz.
Claim 2
Dependent Claim
134 words
A dilation device for dilating or closing blood vessels and other body cavities comprising: a catheter having a radially expandable dilation element, said element having a volume-pressure characteristic including a first zone in which the rate of increase in volume with increasing pressure is relatively low, a second zone in which said rate is substantially higher and substantially linear, and an inflection point separating said first and second zones, and a source of fluid pressure connected to said catheter, control means for said fluid pressure source for producing a pulsating pressure between a lower value lying closely below said inflection point and an upper value lying in said second zone, said dilation element having a structure capable of responding to pressure pulses in said pulsating pressure at a frequency of 0.5 to 3 Hz.
Claim 3
Dependent Claim
32 words
A dilation device according to claim 1 wherein said catheter is connected to said pressure source by a flexible tube whose radial expandability is substantially less than that of said dilation element.
Claim 4
Dependent Claim
33 words
A dilation device according to claim 2 in which said tube is capable of transmitting pressure pulses from said pressure source to the dilation element at a frequency up to about 100 Hz.
Claim 5
Dependent Claim
30 words
A dilation device according to claim 1 or 2 in which the catheter is provided with a pressure measuring channel the front end of which extends beyond the dilation element.
Claim 6
Dependent Claim
33 words
A dilation device according to claim 1 or 2 in which the expansion characteristic of the dilation element gives a reproducible volume change of the element with a change in the pressure applied.
Claim 7
Dependent Claim
67 words
A dilation device according to claim 1 or 2 connected to a pressure source such that the pressure in the dilation element, with each pressure pulse at first increases slowly until the dilation element adjoins the wall of a body cavity and which is recognizable by the diastolic pressure, and the pressure in a pressure recorder, attached to the pressure source, no longer decreases and remains steady.
Claim 8
Dependent Claim
30 words
A dilation device according to claim 6 in which the pressure in the pressure container is used for determining the pressure to be adjusted during dilation of the dilation element.
Claim 9
Dependent Claim
128 words
In a method for dilating or closing a blood vessel or other body cavity comprising positioning within said vessel or cavity a catheter provided with a radially expandable dilation element having a volume-pressure characteristic including a first zone in which the rate of increase in volume with increasing pressure is relatively low, a second zone in which said rate is substantially higher and substantially linear, and an inflection point separating said first and second zones, and supplying to said dilation element a fluid pressure which periodically fluctuates between a lower limit and an upper limit, the improvement comprising: maintaining the lower limit of said fluctuating fluid pressure at a value lying closely below said inflection point and the upper limit thereof at a value within said second zone.
Claim 10
Dependent Claim
128 words
In a method for dilating or closing a blood vessel or other body cavity comprising positioning within said vessel or cavity a catheter provided with a radially expandable dilation element having a volume-pressure characteristic including a first zone in which the rate of increase in volume with increasing pressure is relatively low, a second zone in which said rate is substantially higher and substantially linear, and an inflection point separating said first and second zones, and supplying to said dilation element a fluid pressure which periodically fluctuates between a lower limit and an upper limit, the improvement comprising: maintaining the lower limit of said fluctuating fluid pressure at a value lying closely below said inflection point and the upper limit thereof at a value within said second zone.
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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |