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Disposable non-invasive blood pressure sensorRelated Patent Categories: Surgery, Diagnostic Testing, Cardiovascular, Detecting Blood Vessel Pulsation, Pulse Indicator, Entire Testing Assembly Supported On WristDisposable non-invasive blood pressure sensor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070021674, Disposable non-invasive blood pressure sensor. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION(S) [0001] This patent is a continuation of and claims the benefit of prior U.S. patent application Ser. No. 10/659,617, filed Sep. 10, 2003, entitled "Disposable Non-Invasive Blood Pressure Sensor," which is a continuation of U.S. patent application Ser. No. 10/081,574, filed Feb. 21, 2002, issued as U.S. Pat. No. 6,695,789 and entitled "Disposable Non-Invasive Blood Pressure Sensor" by Roger C. Thede and Kevin R. Evans, all of which are hereby incorporated herein in their entirety by reference thereto. BACKGROUND OF THE INVENTION [0002] The present invention relates to systems and devices for measuring arterial blood pressure. In particular, the invention relates to a two-piece sensor interface assembly for a non-invasive blood pressure measurement device, including a disposable sensing unit. [0003] There has been a continuing need for devices which will measure blood pressure non-invasively and have accuracy comparable to invasive methods. Medwave, Inc. the assignee of the present invention, has developed non-invasive blood pressure measurement devices which are described in the following United States patents: U.S. Pat. No. 5,450,852 entitled CONTINUOUS NON-INVASIVE PRESSURE MONITORING SYSTEM; U.S. Pat. No. 5,640,964 entitled WRIST MOUNTED BLOOD PRESSURE SENSOR; U.S. Pat. No. 5,642,733 entitled BLOOD PRESSURE SENSOR LOCATOR; U.S. Pat. No. 5,649,542 entitled CONTINUOUS NON-INVASIVE BLOOD PRESSURE MONITORING SYSTEM; U.S. Pat. No. 5,720,292 entitled BEAT ONSET DETECTOR; U.S. Pat. No. 5,722,414 entitled CONTINUOUS NON-INVASIVE BLOOD PRESSURE MONITORING SYSTEM; U.S. Pat. No. 5,738,103 entitled SEGMENTED ESTIMATION METHOD; U.S. Pat. No. 5,797,850 entitled METHOD AND APPARATUS FOR CALCULATING BLOOD PRESSURE OF AN ARTERY; U.S. Pat. No. 5,941,828 entitled HAND-HELD NON-INVASIVE BLOOD PRESSURE MEASUREMENT DEVICE; U.S. Pat. No. 6,159,157 entitled BLOOD PRESSURE MEASUREMENT DEVICE WITH SENSOR LOCATOR; and U.S. Pat. No. 6,241,679 entitled NON-INVASIVE BLOOD PRESSURE SENSING DEVICE AND METHOD USING TRANSDUCER WITH ASSOCIATE MEMORY. [0004] As described in these patents, the Medwave non-invasive blood pressure measurement device determines blood pressure by sensing pressure waveform data derived from an artery. As varying pressure is applied to the artery by a sensing chamber, pressure waveforms are sensed by a transducer to produce sensed pressure waveform data. The varying pressure may be applied automatically in a predetermined pattern, or may be applied manually in a somewhat random fashion. The sensed pressure waveform data is analyzed to determine waveform parameters which relate to the shape of the sensed pressure waveforms. One or more blood pressure values are derived based upon the waveform parameters. The Medwave blood pressure measurement devices include both automated devices for continuously monitoring blood pressure (such as in a hospital setting) and hand-held devices which can be used by a physician, or by a patient when desired. These devices represent an important improvement in the field of non-invasive blood pressure measurement. [0005] The non-invasive blood pressure measurement device is typically comprised of a housing unit with a sensor interface assembly attached thereto. The sensor interface assembly includes electrical circuitry, sensing means, including a transducer, and means for applying variable pressure to the artery. The sensor interface assembly is expensive to manufacture and in particular, the most expensive cost associated with it is the electrical circuitry. A problem arises in the hospital, or a clinical setting, where multiple patients use a limited number of non-invasive blood pressure measurement devices. When the sensor interface assembly becomes contaminated or damaged, it is expensive to have it replaced. Therefore, a sensor interface assembly is needed that is less expensive to replace in the non-invasive measurement device. BRIEF SUMMARY OF THE INVENTION [0006] The present invention relates to a non-invasive blood pressure measurement device for determining blood pressure of an artery. The device comprises a housing unit, a base unit and a sensing unit. The base unit is pivotally connected to the housing unit. The base unit includes electrical circuitry, a flexible ring, and a receptacle. The sensing unit includes a pressure transducer for sensing pulses of the underlying artery having a sensing surface, a flexible diaphragm having an active portion for transmitting blood pressure pulses of the underlying artery, interface means coupled between the sensing surface of the transducer and the flexible diaphragm for transmitting the blood pressure pulses within the underlying artery from the flexible diaphragm to the sensing surface of the transducer, a compressible ring, and connection means for detachably connecting the sensing unit to the receptacle of the base unit. BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG. 1 is a perspective view of a blood pressure measurement device of the present invention positioned over a wrist of a patient. [0008] FIG. 2 is a side view of the blood pressure measurement device of FIG. 1. [0009] FIG. 3 is a side view of the blood pressure measurement device with a sensing unit detached from a sensor interface assembly. [0010] FIG. 4A is a top view of a base unit of the blood pressure measurement device. [0011] FIG. 4B is a sectional view of the base unit of the blood pressure measurement device. [0012] FIG. 4C is a bottom view of the base unit of the blood pressure measurement device. [0013] FIG. 5A is a top view of the sensing unit of the blood pressure measurement device. [0014] FIG. 5B is a sectional view of the sensing unit of the blood pressure measurement device. [0015] FIG. 5C is a bottom view of the sensing unit of the blood pressure measurement device. [0016] FIG. 6 is a top exploded view of the base unit and the sensing unit of the blood pressure measurement device. [0017] FIG. 7 is a bottom exploded view of the base unit and the sensing unit of the blood pressure measurement device. DETAILED DESCRIPTION [0018] FIG. 1 illustrates a blood pressure measurement device 10 being used to measure and display blood pressure within an underlying artery within a wrist 12 of a patient. Using a placement guide 14 of measurement device 10, measurement device 10 is placed at the projection of the styloid process bone perpendicular to wrist 12. With device 10, a small amount of force is applied to the radial artery, which runs along the styloid process bone. As the force is applied, blood pressure waveforms are recorded and the corresponding hold down pressure which is being manually applied is also recorded. Using the pressure shape of the blood pressure waveforms, waveform parameters are generated. These parameters, along with universal coefficients determined from clinical samples, are used to calculate pressure values which can then be displayed. Blood pressure measurement device 10 includes placement guide 14, a housing unit 16, a display panel 18, a patient identification toggle 20, a power switch 22, a sensor interface assembly 24 (shown in FIG. 2), including a base unit 26 and a sensing unit 28, and a connection assembly 30 (also shown in FIG. 2) between base unit 26 and housing unit 16. [0019] Housing unit 16 contains the electrical components of measurement device 10. Placement guide 14 is connected to housing unit 16 at the base of housing unit 16. Placement guide 14 straddles the styloid process bone, automatically placing sensing unit 28 over the underlying artery. The shape and configuration of housing unit 16 allows it to hang on the patient's wrist, using placement guide 14 as a type of hook. Housing unit 16 includes a pressure platform 32, which is a flattened depression directly above sensor interface assembly 24. In operation, the user (medical personnel) applies pressure on pressure platform 32 with a thumb or finger. The hold-down force from the user's thumb applies a force in an axial direction (i.e., axial direction with respect to a central cylindrical axis of sensor interface assembly 24) to wrist 12 of the patient. The axial force is transmitted from pressure platform 32 of housing unit 16 to sensor interface assembly 24. Continue reading about Disposable non-invasive blood pressure sensor... Full patent description for Disposable non-invasive blood pressure sensor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Disposable non-invasive blood pressure sensor patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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