US4850957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atherectomy catheter
Assignee: American Biomed Inc
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Filing: 1988-01-11
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Granted: 1989-07-25
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Expires: 2008-01-11
Abstract
Abstract An atherectomy catheter is disclosed comprising an outer catheter tube and an inner catheter tube centrally received within the outer catheter tube and defining an annular passage therebetween. A hydraulic motor is housed within the inner catheter tube and includes a cutting element connected to the drive shaft of the hydraulic motor. A guide wire extends in advance of the cutter element for guiding the catheter through an artery or the like. Pressurized fluid drives the hydraulic motor for rotating the cutter element. Fluid and tissue debris is removed from the site of plaque removal via the annular passage.
Inventors
- 👤 David P. Summers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:43
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3205; A61B17/3207; A61B17/320758; A61B1/00; A61B1/12; A61B17/320783; A61B2017/00535; A61B2017/00539; A61B2017/320791
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
131 words
An atherectomy catheter for removal of occlusive material in an artery, comprising: (a) an outer catheter tube; (b) an inner catheter tube concentrically received within said outer catheter tube and defining an annulus therebetween; (c) a hydraulic motor housed within said inner catheter tube, wherein said hydraulic motor comprises a stator and rotor means, said stator defining a cavity which supports and guides said rotor means and wherein said cavity is uniformly curved in a spriral-like helical shape; (d) cutting means connected to said hydraulic motor; (e) guide means extending in advance of said cutting means for guiding the catheter through the artery; and (f) pump means for pumping fluid through the catheter for driving said hydraulic motor and creating a vacuum for removing fluid and occlusive material through said annulus.
Claim 2
Dependent Claim
131 words
An atherectomy catheter for removal of occlusive material in an artery, comprising: (a) an outer catheter tube; (b) an inner catheter tube concentrically received within said outer catheter tube and defining an annulus therebetween; (c) a hydraulic motor housed within said inner catheter tube, wherein said hydraulic motor comprises a stator and rotor means, said stator defining a cavity which supports and guides said rotor means and wherein said cavity is uniformly curved in a spriral-like helical shape; (d) cutting means connected to said hydraulic motor; (e) guide means extending in advance of said cutting means for guiding the catheter through the artery; and (f) pump means for pumping fluid through the catheter for driving said hydraulic motor and creating a vacuum for removing fluid and occlusive material through said annulus.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein said rotor means comprises a rotor formed in a spiral-like helical configuration.
Claim 4
Dependent Claim
18 words
The apparatus of claim 2 wherein pressurized fluid forced through said cavity provides power for rotating said rotor.
Claim 5
Dependent Claim
34 words
The apparatus of claim 3 wherein said rotor includes flexible universal joints bonded at each end thereof for translating the eccentric motion of said rotor to a rotary motion for rotating said cutting means.
Claim 6
Dependent Claim
24 words
The apparatus of claim 4 including bearing means journaled about said universal joints supported by support plate means mounted within said inner catheter tube.
Claim 7
Dependent Claim
23 words
The apparatus of claim 5 wherein said inner catheter tube includes a plurality of ports permitting fluid to exit therethrough into said annulus.
Claim 8
Dependent Claim
22 words
The apparatus of claim 6 wherein said cutting means comprises a cutter element formed of continuous filament fibers defining a brush-like cutter.
Claim 9
Dependent Claim
27 words
The apparatus of claim 1 wherein fluid pressure for driving said hydraulic motor is provided by water forced through said innner catheter tube by said pump means.
Claim 10
Dependent Claim
32 words
The apparatus of claim 1 wherein said cutting means comprises a plurality of curved cutting blades for sweeping bits of occlusive material into said inner catheter tube for removal via said annulus.
Claim 11
Dependent Claim
34 words
The apparatus of claim 1 wherein said outer catheter tube includes a chamber for housing said cutting means, said chamber having a window opening providing access to the occlusive material by said cutting means.
Claim 12
Dependent Claim
25 words
The apparatus of claim 10 wherein said window opening permits said cutting means to contact the occlusive material through an arc of 150° to 180°.
Claim 13
Dependent Claim
18 words
The apparatus of claim 10 wherein said cutting means is retractable to a storage position within said chamber.
Claim 14
Dependent Claim
25 words
The apparatus of claim 10 wherein said cutting means includes a drive shaft reciprocally supported on support plate means mounted within said outer catheter tube.
Claim 15
Independent Claim
112 words
An apparatus for removing an obstruction in a vessel in the human body, comprising: (a) an outer catheter tube; (b) an inner catheter tube concentrically received within said outer catheter tube and defining an annulus therebetween; (c) a hydraulic motor housed within said inner catheter tube, wherein said hydraulic motor includes a stator and rotor means, said stator defining a cavity uniformly curved in a spiral-like helical shape for supporting and guiding said rotor means; (d) cutting means connected to said hydraulic motor; and (e) pump means for pumping fluid through the catheter for driving said hydraulic motor and creating a vacuum for removing fluid and bits of obstruction through said annulus.
Claim 16
Independent Claim
112 words
An apparatus for removing an obstruction in a vessel in the human body, comprising: (a) an outer catheter tube; (b) an inner catheter tube concentrically received within said outer catheter tube and defining an annulus therebetween; (c) a hydraulic motor housed within said inner catheter tube, wherein said hydraulic motor includes a stator and rotor means, said stator defining a cavity uniformly curved in a spiral-like helical shape for supporting and guiding said rotor means; (d) cutting means connected to said hydraulic motor; and (e) pump means for pumping fluid through the catheter for driving said hydraulic motor and creating a vacuum for removing fluid and bits of obstruction through said annulus.
Claim 17
Dependent Claim
31 words
The apparatus of claim 14, wherein said rotor means comprises a rotor formed in a spiral-like helical configuration corresponding to the spiral-like helical shape of said cavity defined by said stator.
Claim 18
Dependent Claim
34 words
The apparatus of claim 15 wherein said rotor includes flexible universal joints bonded at each end thereof for translating the eccentric motion of said rotor to a rotary motion for rotating said cutting means.
Claim 19
Dependent Claim
24 words
The apparatus of claim 16 including bearing means journalled about said universal joints supported by support plate means mounted within said inner catheter tube.
Claim 20
Dependent Claim
22 words
The apparatus of claim 17 wherein said cutting means comprises a cutter element formed of continuous filament fibers defining a brush-like cutter.
Claim 21
Dependent Claim
52 words
The apparatus of claim 14 wherein said cutting means comprises a plurality of curved cutting blades mounted on a circular base mounted to one of said universal joints, wherein said cutting blades project inwardly from the periphery of said circular base to a point defining the rotational axis of said cutting means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |