Device for body fluid pressure measurement
First Claim
1. A device for measuring spinal fluid pressure using a needle cannula, comprising:
- a housing including a fluid channel wall that defines a fluid channel, the housing including a tip end configured to receive the needle canula to allow spinal fluid to enter the housing and a fluid port configured to allow spinal fluid to exit the housing;
a valve located in said fluid channel between said tip end and said fluid port, the fluid channel wall having a constant cross-section from the valve to the tip end; and
a pressure transducer at least partially forming said fluid channel wall between the tip end and the valve and adapted to take a static pressure measurement of the spinal fluid pressure with the valve closed using a minimal amount of spinal fluid.
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Abstract
A device for measuring body fluid pressure, such as blood pressure, muscle compartment pressure, and spinal column pressure, is herein described. An invasive implement is inserted into a body area, and a fluid path extends from the body area into a fluid channel in the device. A valve is used to control the flow of fluid through the device and a pressure sensor is placed adjacent to the fluid channel, with the pressure sensor and/or a sealant gel forming a portion of the fluid channel. With the valve closed, pressure builds in the fluid channel and the pressure sensor detects the resulting pressure, and a pressure transducer and supporting electronics converts and communicates the pressure measurement. With this device the pressure sensor can detect pressure without contacting the fluid, so therefore a pressure can be taken with a minimum of fluid extraction. If fluid extraction is desired, the valve is opened and fluid flows from the body area to a fluid port where the fluid may be collected.
85 Citations
15 Claims
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1. A device for measuring spinal fluid pressure using a needle cannula, comprising:
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a housing including a fluid channel wall that defines a fluid channel, the housing including a tip end configured to receive the needle canula to allow spinal fluid to enter the housing and a fluid port configured to allow spinal fluid to exit the housing; a valve located in said fluid channel between said tip end and said fluid port, the fluid channel wall having a constant cross-section from the valve to the tip end; and a pressure transducer at least partially forming said fluid channel wall between the tip end and the valve and adapted to take a static pressure measurement of the spinal fluid pressure with the valve closed using a minimal amount of spinal fluid. - View Dependent Claims (2, 3, 4, 5)
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6. A device for measuring spinal fluid pressure, comprising:
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a housing including a fluid channel wall that defines a fluid channel, the housing including a tip end configured to allow spinal fluid to enter the housing and a fluid port configured to allow spinal fluid to exit the housing, a hollow needle cannula connected to the tip end of the housing and coaxially aligned with the fluid channel; a valve located in said fluid channel between said tip and said fluid port, the fluid channel wall having a constant cross-section from the valve to the tip end; and a pressure transducer located in said fluid channel between said tip end and fluid port and coaxially aligned with the hollow needle cannula so that a pressure measurement of the spinal fluid pressure can be made using a minimal amount of spinal fluid. - View Dependent Claims (7, 8, 9)
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10. A method of measuring spinal fluid pressure, comprising:
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providing a device for measuring spinal fluid pressure including a housing having a fluid channel wall that defines a fluid channel, the housing including a tip end configured to allow spinal fluid to enter the housing and a fluid port configured to allow spinal fluid to exit the housing, a hollow needle cannula attached to the tip end, a substantially rigid obturator positionable in the hollow cannula and fluid channel, a valve located in said fluid channel between said tip end and said fluid port, the fluid channel wall having a constant cross-section from the valve to the tip end, a pressure transducer at least partially forming said fluid channel wall between the tip end and the valve; inserting the needle cannula into a spinal area of the patient with the obturator positioned in the hollow cannula; removing the obturator from the needle cannula; and taking a static pressure measurement of the spinal fluid pressure with the valve closed using a minimal amount of spinal fluid. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification