Body fluid pressure system

• US 4,036,216 A
• Filed: 09/04/1975
• Issued: 07/19/1977
• Est. Priority Date: 09/04/1975
• Status: Expired due to Term

• Current Assignee: Critikon, Inc.
• Original Assignee: Maynard Ramsey III
• Inventors: Ramsey, Maynard III
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US05/610,389
• Time in Patent Office: 684 Days
• Field of Search: 128/2.05 D, 128/2.05 E, 128/2.05 R, 128/2.05 A, 73/395, 73/402, 73/406, 73/407 R, 73/409
• US Class Current: 600/488
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/03 Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs A61B5/205 takes precedence
• CPC Class Codes: G01L 19/003 using a detachable interface or adapter between the process medium and the pressure gauge
• CPC Class Codes: G01L 19/0046 using isolation membranes G01L13/026 and G01L19/0645 take precedence

Abstract

A disposable blood pressure monitor comprising an elongated tubular structure, adapted on one end to place its interior in direct communication with a fluid system to be monitored. A flexible tube shaped membrane is received within the tubular structure, separating the tubular structure into first and second chambers and a gauge assembly engages the other end of the tubular structure, to place the interior of the other chamber of the tubular structure in a pressure transfer communication with the fluid system to be monitored. The gauge assembly comprises a plug, a pressure measuring device mounted to the plug, a sensing tube extending through the plug and communicating with the pressure measuring device and a fluid filled sack member secured to the sensing tube. The sack member communicates with the pressure measuring device through the sensing tube and engages the inner wall of the flexible tube shaped membrane to place the gauge in a pressure responsive position with the fluid system to be monitored.

Claims

1. A disposable blood pressure monitor comprising an elongated tubular structure, means on one end of said tubular structure adapted to place the interior of said tubular structure in direct communication with a fluid system to be monitored, a flexible tube shaped membrane received within said tubular structure, said flexible tube shaped membrane separating said tubular structure into first and second chambers, gauge means engaging the other end of said tubular structure, said gauge means being removably in said tubular structure and adapted to place the interior of said tubular structure in a pressure transfer communication with the fluid system to be monitored, said gauge means comprising a plug means, a pressure indicating means mounted to said plug means, a tube means extending through said plug means and communicating with said pressure indicating means, sensor means mounted on said tube means and an incompressible fluid filled sack member secured to said tube means and containing said sensor means, said sack member communicating with said pressure indicating means, and engaging the inner wall of said flexible tube shaped membrane through said tube means placing said gauge means in a pressure responsive communication with the fluid system to be monitored.

2. A disposable blood pressure monitor as claimed in claim 1 wherein said tube means comprises a tube member defining a bore secured to said gauge means to allow communication of said gauge with said sack member.

3. A disposable blood pressure monitor as claimed in claim 1 wherein said sack member has a blunt end having the same configuration as an end of the flexible tube shaped membrane.

4. A disposable blood pressure monitor as claimed in claim 2 wherein said sack member is tubular shaped and has a smaller diameter than the inner bore diameter of said flexible tube shaped membrane.

5. A disposable blood pressure monitor as claimed in claim 2 wherein said gauge means includes a threaded plug means, said threaded plug means being adapted to engage the interior of said flexible tube shaped membrane to form a fluid tight seal.

6. A disposable blood pressure monitor as claimed in claim 1 wherein said pressure indicating means comprises a transducer connected by circuit means to a visual readout device.

7. A disposable blood pressure monitor as claimed in claim 1 wherein said pressure indicating means is an aneroid gauge.

8. A disposable blood pressure monitor as claimed in claim 1 wherein said gauge means includes a plug member provided with thread cutting threads.

9. A disposable blood pressure monitor as claimed in claim 1 wherein said tubular structure defines a flange on one end and said gauge means has a stop secured thereto adapted to abut said flanged end to limit the distance that the gauge means can be inserted into the tubular structure.

10. A disposable blood pressure monitor as claimed in claim 1 wherein a ring shaped member is positioned around said flexible tube shaped member to place said tube shaped membrane in a predetermined position inside said elongated tubular structure.

11. A disposable blood pressure monitor with a reuseable assembly using a transducer for measuring the blood pressure in a system comprising an elongated tubular structure, connector means formed on one end of said tubular structure adapted to place the interior of said tubular structure in direct communication with a fluid system to be monitored, a flexible saclike membrane positioned within said tubular structure to separate said tubular structure into first and second chambers, said reuseable assembly being mounted to the other end of said tubular structure, said reuseable assembly comprising transducer means including a plug means removably mounted to and sealing the other end of said tubular structure, said transducer means comprising a transducer housing, a transducer assembly mounted within said housing, a tubular sack member filled with an incompressible liquid mounted to said housing, a sensor means connected to said transducer assembly and extending outside of said housing and contained within said tubular sack member giving said sack member semirigid form allowing it to be inserted inside said flexible saclike membrane.

12. A disposable blood pressure monitor as claimed in claim 11 including circuit means connected to said transducer assembly and pressure indicating means connected to said circuit means, said circuit means transmitting electrical equivalents of pressure variations occurring in said tubular structure in the form of electrical signals to said indicating means which registers said signals in a readable form.

13. A disposable blood pressure monitor as claimed in claim 12 wherein said pressure indicating means is a digital readout apparatus.

14. A disposable blood pressure monitor as claimed in claim 11 wherein the outer diameter of said transducer sac member is smaller than the diameter of the bore of the saclike flexible membrane.

15. A disposable blood pressure monitor as claimed in claim 11 wherein said other end of said tubular structure is inclined outwardly from the body of said tubular structure and has an outwardly extending flange.

16. A disposable blood pressure monitor comprising a disposable assembly and a reuseable assembly, said disposable assembly comprising an elongated tubular structure, means on one end of said tubular structure adapted to place the interior of said tubular structure in direct communication with a fluid system to monitor, a flexible tube shaped membrane received within said tubular structure, said flexible tube shaped membrane separating said tubular structure into first and second chambers, said reuseable assembly comprising gauge means removably engaging the other end of said tubular structure, said gauge means comprising a housing defining a plug adapted to engage the other end of said tubular structure, said plug being provided with a fluid passage means, a pressure indicating means mounted to said housing, a sensing stem connected to said pressure indicating means and extending through said plug, and a sack member filled with an incompressible liquid secured to one end of said sensing stem, said sack member having a smaller diameter than the inner diameter of said flexible tube shaped membrane allowing it to be inserted therein so that when the interior of said tube structure comes in direct communication with the fluid system to be monitored the pressure from the fluid compresses the flexible tube shaped membrane against the fluid filled sack member forcing all of the air through said fluid passage means from the flexible tube shaped membrane allowing said pressure indicating means to be in communication with the fluid system being monitored.

17. A disposable blood pressure monitor as claimed in claim 16 wherein said pressure indicating means is an aneroid gauge.

18. A disposable blood pressure monitor as claimed in claim 16 wherein said pressure indicating means comprises a transducer assembly connected by circuit means to a visual readout device.

19. A disposable blood pressure monitor comprising an elongaged tubular structure, means on one end of said tubular structure adapted to place the interior of said tubular structure in direct communication with a fluid system to be monitored, a thin flexible tube shaped membrane received within said tubular structure, said thin flexible tube shaped membrane separating said tubular structure into first and second chambers, removable and reuseable gauge means engaging the other end of said tubular structure, said gauge means comprising a housing defining a plug adapted to engage the other end of said tubular structure, a pressure indicating means mounted to said housing, a sensing means connected to said pressure indicating means and extending through and from said plug, a sack member filled with an incompressible fluid secured to said housing and surrounding an extended portion of said sensing means, said sack member having a smaller diameter than the inner diameter of said flexible tube shaped membrane so that when said plug engages the other end of said tubular structure the fluid filled sack member is inserted into the flexible tube shaped membrane with the result that when the interior of said tubular structure comes in direct communication with the fluid system to be monitored, the pressure from the fluid compresses the flexible tube shaped membrane against the fluid filled sack member forcing all of the air from the flexible tube shaped membrane allowing said pressure indicating means to be in substantially fluid to fluid communication with the fluid system being monitored.

20. A disposable blood pressure monitor as claimed in claim 19 wherein said pressure indicating means is an aneroid gauge.

21. A disposable blood pressure monitor as claimed in claim 19 wherein said pressure indicating means is a transducer assembly connected by circuit means to a visual readout device.