Patent US5378230A successfully refreshed from Google Patents.
US5378230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triple-lumen critical care catheter
Assignee: SUDHA S MAHURKAR TRUST
•
Filing: 1993-11-01
•
Granted: 1995-01-03
•
Expires: 2013-11-01
Abstract
Abstract A multiple-lumen intravenous catheter for critical-care applications comprises an elongated cylindrical tube. This tube has a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section. The smallest diameter of the elliptical cross section is larger than the radius of the interior of the catheter. A second septum divides the crescent-shaped lumen into two small lumens.
Inventors
- 👤 Sakharam D. Mahurkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0021; A61M25/0023; A61M25/0026; A61M25/0032; A61M2025/0001; A61M2025/0003; A61M25/003; A61M2025/0031
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
73 words
A multiple-lumen intravenous catheter for critical-care applications, said catheter comprising an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens.
Claim 2
Dependent Claim
73 words
A multiple-lumen intravenous catheter for critical-care applications, said catheter comprising an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens.
Claim 3
Dependent Claim
15 words
The catheter of claim 1 wherein said cylindrical tube and said large lumen are co-tangential.
Claim 4
Dependent Claim
16 words
The catheter of claim 1 wherein the transverse cross section of said large lumen is circular.
Claim 5
Dependent Claim
17 words
The catheter of claim 1 wherein said first septum is arcuate and said second septum is planar.
Claim 6
Dependent Claim
39 words
The catheter of claim 1 wherein said cylindrical tube and said elliptical lumen are co-tangential, said second septum is planar and lies in a diametral plane passing through the point of co-tangency between said tube and said elliptical lumen.
Claim 7
Dependent Claim
28 words
The catheter of claim 1 wherein the major axis of the elliptical cross section of said larger lumen is perpendicular to a diametral plane containing said second septum.
Claim 8
Dependent Claim
74 words
The catheter of claim 1 which includes a hollow conical tip on the distal end of said tube, the outside surface of said conical tip merging smoothly with the outside surface of said tube, and the inside surface of said conical tip merging smoothly with the inside surface of said large lumen, the distal ends of the other two lumens being longitudinally spaced from the distal end of said tip and from each other.
Claim 9
Dependent Claim
28 words
The catheter of claim 4 wherein said conical tip forms a solid connection from the distal ends of said other lumens to the distal end of said tip.
Claim 10
Dependent Claim
35 words
The catheter of claim 1 wherein said large lumen extends all the way through the distal end of said tube, said other lumens terminate at apertures spaced longitudinally from the distal end of said tube.
Claim 11
Independent Claim
118 words
A method of using a multiple-lumen intravenous catheter with a critically-ill patient, said multiple-lumen catheter including an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens, the method comprising the steps of: inserting the catheter into a vein of a patient; infusing a fluid into the vein through the large lumen; and monitoring the hydrostatic pressure in the vein through one of the other lumens.
Claim 12
Independent Claim
118 words
A method of using a multiple-lumen intravenous catheter with a critically-ill patient, said multiple-lumen catheter including an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens, the method comprising the steps of: inserting the catheter into a vein of a patient; infusing a fluid into the vein through the large lumen; and monitoring the hydrostatic pressure in the vein through one of the other lumens.
Claim 13
Independent Claim
130 words
A method of using a multiple-lumen intravenous catheter with a critically-ill patient, said multiple-lumen catheter including an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens, the method comprising the steps of: inserting the catheter into a vein of a patient; infusing a first fluid into the vein through the large lumen; monitoring the hydrostatic pressure in the vein through one of the other lumens; and infusing a second fluid into the vein through the third lumen.
Claim 14
Independent Claim
130 words
A method of using a multiple-lumen intravenous catheter with a critically-ill patient, said multiple-lumen catheter including an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens, the method comprising the steps of: inserting the catheter into a vein of a patient; infusing a first fluid into the vein through the large lumen; monitoring the hydrostatic pressure in the vein through one of the other lumens; and infusing a second fluid into the vein through the third lumen.
Claim 15
Independent Claim
129 words
A method of using a multiple-lumen intravenous catheter with a critically-ill patient, said multiple-lumen catheter including an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens, the method comprising the steps of: inserting the catheter into a vein of a patient; infusing a first fluid into the vein through the large lumen; monitoring the hydrostatic pressure in the vein through one of the other lumens; and injecting a medication into the vein through the third lumen.
Claim 16
Independent Claim
129 words
A method of using a multiple-lumen intravenous catheter with a critically-ill patient, said multiple-lumen catheter including an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens, the method comprising the steps of: inserting the catheter into a vein of a patient; infusing a first fluid into the vein through the large lumen; monitoring the hydrostatic pressure in the vein through one of the other lumens; and injecting a medication into the vein through the third lumen.
Claim 17
Independent Claim
128 words
A method of using a multiple-lumen intravenous catheter with a critically-ill patient, said multiple-lumen catheter including an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens, the method comprising the steps of: inserting the catheter into a vein of a patient; infusing a first fluid into the vein through the large lumen; monitoring the hydrostatic pressure in the vein through one of the other lumens; and withdrawing blood from the vein through the third lumen.
Claim 18
Independent Claim
128 words
A method of using a multiple-lumen intravenous catheter with a critically-ill patient, said multiple-lumen catheter including an elongated cylindrical tube having a first septum dividing the interior of the catheter into a large lumen having an elliptical cross section, and a smaller lumen having a crescent-shaped cross section, the smallest diameter of said elliptical cross section being larger than the radius of the interior of the catheter, and a second septum dividing the crescent-shaped lumen into two small lumens, the method comprising the steps of: inserting the catheter into a vein of a patient; infusing a first fluid into the vein through the large lumen; monitoring the hydrostatic pressure in the vein through one of the other lumens; and withdrawing blood from the vein through the third lumen.
References Cited (Backward Citations)
USRE31873E
Cited
USRE31873F1
Cited
US4733669A
Cited
US4795439A
Cited
US5195962A
Cited
US4995865A
Cited
US5221255A
Cited
US5108369A
Cited
US5190520A
Cited
US5221256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |