Claims
- 1. A system for delivering contrast medium at low pressure to a catheter for delivery to a patient's vascular system comprising: a dual check valve adapted to be connected to a lower pressure source of contrast medium, said dual check valve having an inlet port, an outlet port and an inlet-outlet port, said dual check valve containing a first one-way valve at said inlet port automatically responsive to the relatively low pressure at said inlet-outlet port to permit down-stream fluid flow and to prevent upstream fluid flow, said dual check valve containing a second one-way valve at said outlet port automatically responsive to the relatively high pressure at said inlet-outlet port to permit downstream fluid flow and to prevent upstream fluid flow, said inlet-outlet port in communication with said first and second one-way valves and adapted to be connected to a pump, a connecting tubular member having an upstream and a downstream end, said upstream end in communication with said outlet port of said dual check valve, suction at said inlet-outlet port by athe pump causing flow of medium from whatever source is coupled to said inlet port through said first one-way valve into the pump, said second one-way valve preventing fluid flow upstream from said connecting tubular member into the pump, positive pressure at said inlet-outlet port from athe pump causing fluid flow through said second one-way valve and said outlet port into said tubular member, said first one-way valve preventing upstream fluid flow to athe source, and a third one-way valve in communication with said down-stream end of said tubular member to permit down-stream fluid flow from said tubular member and to prevent upstream fluid flow into said tubular member.
- 2. The system of claim 1 further comprising:a first stopcock upstream of said inlet port of said dual check valve to turn flow from athe source on and off.
- 3. The system of claim 1 further comprising:a second stopcock downstream of said third one-way valve to turn flow into athe catheter on and off.
- 4. The system of claim 2 further comprising:a second stopcock downstream of said third one-way valve to turn flow into athe catheter on and off.
- 5. The system of claim 1 further comprising:a second dual check valve downstream of said down-stream end of said tubular member and incorporating said third one-way valve, said second dual check valve having a second inlet-outlet port adapted to be connected to an ancillary pump, said second dual check valve having a fourth one-way valve in communication with said second inlet-outlet port to permit downstream fluid flow from anthe ancillary pump, said third one-way valve preventing upstream fluid flow from anthe ancillary pump.
- 6. The system of claim 5 further comprising:a first stopcock upstream of said inlet port of said dual check valve to turn flow from athe source on and off.
- 7. The system of claim 5 further comprising:a second stopcock downstream of said second dual check valve to turn flow into athe catheter on and off.
- 8. The system of claim 6 further comprising:a second stopcock downstream of said second dual check valve to turn flow into athe catheter on and off.
- 9. An apparatus for delivering contrast medium at low pressure to a catheter for delivery to a patient's vascular system comprising:a dual check valve adapted to be connected to a lower pressure source of contrast medium, said dual check valve having a first inlet port, a first outlet port and a first inlet-outlet port, said dual check valve containing a first one-way valve at said first inlet port automatically responsive to the relatively low pressure at said first inlet-outlet port to permit downstream fluid flow and to prevent upstream fluid flow, said dual check valve containing a second one-way valve at said first outlet port automatically responsive to the relatively high pressure at said first inlet-outlet port to permit downstream fluid flow and to prevent upstream fluid flow, said first inlet-outlet port in communication with said first and second one-way valves and adapted to be connected to a pump, a connecting tubular member having an upstream and a downstream end, said upstream end in communication with said first outlet port of said dual check valve, suction at said first inlet-outlet port by the pump causing flow of medium from whatever source is coupled to said first inlet port through said first one-way valve into the pump, said second one-way valve preventing fluid flow upstream from said connecting tubular member into the pump, and positive pressure at said first inlet-outlet port from the pump causing fluid flow through said second one-way valve and said first outlet port into said tubular member, said first one-way valve preventing upstream fluid flow to the source.
- 10. The apparatus of claim 11 further comprising:a first stopcock upstream of said first inlet port of said dual check valve to turn flow from the source on and off.
- 11. The apparatus of claim 10 further comprising:a second stopcock on said downstream end of said tubular member to turn flow into the catheter on and off.
- 12. The apparatus of claim 9 further comprising:a stopcock on said downstream end of said tubular member to turn flow into the catheter on and off.
- 13. The apparatus of claim 9 further comprising:an in-line check valve connected to said downstream end of said tubular member, wherein said in-line check valve has a second inlet port in which said tubular member is connected, a second inlet-outlet port adapted to be connected to an ancillary pump, and a second outlet port connected to a first stopcock which is connected to the catheter.
- 14. The apparatus of claim 13 further comprising:a second stopcock upstream of said first inlet port of said dual check valve to turn flow from the source on and off.
- 15. The apparatus of claim 14 further comprising:a third stopcock disposed between the ancillary pump and the second inlet-outlet port downstream said in-line check valve to turn flow into the catheter on and off.
CROSS-REFERENCE TO A RELATED APPLICATION
This application relies for priority purposes on U.S. provisional application No. 60/031,116 filed Nov. 14, 1996.
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
5250034 |
Appling et al. |
Oct 1993 |
A |
5267979 |
Appling et al. |
Dec 1993 |
A |
5569208 |
Woelpper et al. |
Oct 1996 |
A |
5575767 |
Stevens |
Nov 1996 |
A |
5651776 |
Appling et al. |
Jul 1997 |
A |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/031116 |
Nov 1996 |
US |
Divisions (1)
|
Number |
Date |
Country |
Parent |
08/966671 |
Nov 1997 |
US |
Child |
10/116486 |
|
US |
Reissues (1)
|
Number |
Date |
Country |
Parent |
08/966671 |
Nov 1997 |
US |
Child |
10/116486 |
|
US |