Pressure diaphragm for a medication infusion system
First Claim
Patent Images
1. A pressure diaphragm for facilitating the measurement of fluid pressure, comprising:
- a housing member having an upper surface portion;
a pressure plateau located on and extending above said upper surface portion of said housing member, said pressure plateau being essentially circular and having an essentially flat top and essentially cylindrical sides;
a channel recessed in said flat top of said pressure plateau, said channel extending diametrically across said pressure plateau;
thin, flexible diaphragm means located above and spaced away from said flat top and said cylindrical sides of said pressure plateau, said diaphragm means including a cylindrical portion located around said pressure plateau, the inner diameter of said cylindrical portion of said diaphragm means being larger than the outer diameter of said pressure plateau, said diaphragm means being maintained in a sealing relationship with said upper surface portion of said housing member;
fluid inlet means located in said housing, said fluid inlet means for supplying fluid to said pressure plateau at one end of said channel in said pressure plateau, fluid pressure being transmitted to said diaphragm means; and
fluid outlet means located in said housing, said fluid outlet means for removing fluid from said pressure plateau at the other end of said channel in said pressure plateau.
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Abstract
A pressure diaphragm installed in a disposable cassette for use on a main pump unit is disclosed which allows pressure downstream of a fluid pump to be measured with a high degree of accuracy. The pressure diaphragm is located over a raised cylindrical pressure plateau, and is spaced away from the plateau on the top and on the sides thereof to allow for a free movement of the pressure diaphragm. Fluid flow is from one side of the pressure plateau to the opposite side, with fluid flowing between the pressure diaphragm and the top and sides of the pressure plateau, as well as through a channel disposed in the pressure plateau.
229 Citations
17 Claims
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1. A pressure diaphragm for facilitating the measurement of fluid pressure, comprising:
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a housing member having an upper surface portion; a pressure plateau located on and extending above said upper surface portion of said housing member, said pressure plateau being essentially circular and having an essentially flat top and essentially cylindrical sides; a channel recessed in said flat top of said pressure plateau, said channel extending diametrically across said pressure plateau; thin, flexible diaphragm means located above and spaced away from said flat top and said cylindrical sides of said pressure plateau, said diaphragm means including a cylindrical portion located around said pressure plateau, the inner diameter of said cylindrical portion of said diaphragm means being larger than the outer diameter of said pressure plateau, said diaphragm means being maintained in a sealing relationship with said upper surface portion of said housing member; fluid inlet means located in said housing, said fluid inlet means for supplying fluid to said pressure plateau at one end of said channel in said pressure plateau, fluid pressure being transmitted to said diaphragm means; and fluid outlet means located in said housing, said fluid outlet means for removing fluid from said pressure plateau at the other end of said channel in said pressure plateau. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A pressure diaphragm for facilitating the measurement of fluid pressure, comprising:
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a housing member having an upper surface portion; an essentially circular pressure plateau located on and extending above said upper surface portion of said housing member, said pressure plateau and having an essentially flat top surface and essentially cylindrical sides; a channel recessed in said pressure plateau, said channel extending diametrically across said pressure plateau; thin, flexible diaphragm means for defining an area with said pressure plateau through which fluid may flow, said area being between the top and sides of said pressure plateau and said diaphragm means, said diaphragm means including a flat portion located above and spaced away from said flat top surface and said essentially cylindrical sides of said pressure plateau, said diaphragm means also including a cylindrical portion extending in a sealing relationship between the outer edge of said flat portion of said diaphragm means and said upper surface portion of said housing member, said cylindrical portion of said diaphragm means being located around the sides of said pressure plateau, the inner diameter of said cylindrical portion of said diaphragm means being larger than the outer diameter of said pressure plateau; fluid inlet means located in said housing, said fluid inlet means for supplying fluid to said pressure plateau at one end of said channel in said pressure plateau; and fluid outlet means located in said housing, said fluid outlet means for removing fluid from said pressure plateau at the other end of said channel in said pressure plateau, fluid flowing through said channel, over said flat top surface of said pressure plateau, and around the sides of said pressure plateau, whereby fluid pressure is transmitted to said diaphragm means.
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16. A pressure diaphragm for facilitating the measurement of fluid pressure, comprising:
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a housing member having an upper surface portion; a flat, circular pressure plateau located on and extending above said upper surface portion of said housing member; a channel recessed in said pressure plateau, said channel extending diametrically across said pressure plateau; flexible diaphragm means located above the top and around the sides of said pressure plateau, said diaphragm means being spaced away from the top and sides of said pressure plateau, said diaphragm means being maintained in a sealing relationship with said upper surface portion of said housing member; fluid inlet means for supplying fluid to said pressure plateau at one end of said channel in said pressure plateau; and fluid outlet means for removing fluid from said pressure plateau at the other end of said channel in said pressure plateau.
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17. A method of facilitating the measurement of fluid pressure using a pressure diaphragm, comprising:
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locating a pressure plateau on the upper surface portion of a housing member, said pressure plateau extending above said upper surface portion of said housing member, said pressure plateau being essentially circular and having an essentially flat top and essentially cylindrical sides; recessing a channel in said flat top of said pressure plateau, said channel extending diametrically across said pressure plateau; locating thin, flexible diaphragm means above and spaced away from said flat top and said cylindrical sides of said pressure plateau, said diaphragm means including a cylindrical portion located around said pressure plateau, the inner diameter of said cylindrical portion of said diaphragm means being larger than the outer diameter of said pressure plateau, said diaphragm means being maintained in a sealing relationship with said upper surface portion of said housing member; supplying fluid to said pressure plateau at one end of said channel in said pressure plateau through fluid inlet means located in said housing, fluid pressure being transmitted to said diaphragm means; and removing fluid from said pressure plateau at the other end of said channel in said pressure plateau through fluid outlet means located in said housing.
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Specification