地址：上海市闵行区兴梅路485号 xingmei rd 485,shanghai,china
components for 2-channel bp monitor:
1 ea bpm-832 amplifier
2 ea dtx-1 bp transducer
2 ea tc-gra adapter cable
the bpm-832 pressure monitor provides two independent amplifiers for use with bridge-type transducers, including pressure, force, and acceleration. each channel includes a high-gain preamplifier, low-pass filtering, adjustable dc balancing, and a digital readout.
the wide gain range of the bpm-832 and its excellent dc stability make it the perfect choice for interfacing most bridge-type transducers. the digital display can be calibrated in real-world units, such as mmhg, for convenient monitoring. corresponding analog outputs are provided for each channel for external recording.
a variety of transducers is available from cwe, inc. these include blood-pressure transducers, airway pressure transducers, sensitive differential transducers for measuring airflow with a pneumotach, and force transducers. the input connectors are compatible with all cwe and grass instruments® pressure and force transducers. adapter cables are available for most commercial transducers as well.
the bpm-832 is powered by a regulated, wall-mount power supply with all international approvals, including the ce mark. the bpm-832 provides a compact, economical solution for most transducer interfacing applications.
direct arterial bp tracing
|direct bp||indirect bp (nibp)|
|þ "gold standard" for accuracy||þ good accuracy (<+6mmhg) depending on technique|
|þ continuous measurement||þ intermittent measurement|
|þ analog signal suitable for data acquisition||þ requires software to compute measurements|
|þ both systolic and diastolic measurement||þ both systolic and diastolic measurement|
|þ mean bp requires processing of raw signal||þ provides mean bp|
|þ signal must be processed to get heart rate (hr)||þ provides heart rate (hr)|
|þ requires surgery to place catheter||þ no surgery required|
|þ no special restraints required||þ requires restraining animal in holder|
|þ periodic flushing of catheter required||þ periodic inflation/deflation of cuff required|
|þ does not require warming of animal||þ some systems require warming of animal to increase blood flow in extremities (see note)|
measuring blood pressure (bp) is a common requirement for many experimental procedures. it is typically done in one of two ways:
the direct method is straightforward, but requires catheterization of a major artery. the catheter is connected to a blood pressure transducer and suitable amplifier to produce an analog signal. this signal can be observed on an oscilloscope, or fed into a data acquisition system for recording and analysis.
the nibp method uses an inflatable cuff around the tail of the animal, a means of inflating/deflating the cuff, and a means of detecting pulsatile blood flow. depending on the equipment, special software is required to monitor the results, or the measurements can be sent serially to a computer for data collection.
important note: nibp systems differ in the means of pulse detection. mice and rats increase blood flow to their tails as a means of thermoregulation; as the body temperature increases, blood flow is diverted to the tail for heat radiation. the less-sensitive piezo-electric transducers require this heating to get an adequate signal. the more sensitive photoplethysmographic technique normally does not require heating above ambient temperature. it has long been known that heating the animal produces thermostress, and actually increases bp. thus the well-established photoplethysmographic method produces the most accurate measurements.
the table below lists the major features and advantages of each of these methods of measuring bp. click on the highlighted link to go directly to that page.
note: the photoplethysmographic nibp systems sold by cwe are inherently more sensitive than piezo sensor systems, and do not normally require animal heating.
|08-12000||bpm-832||dual-channel pressure monitor with power supply, specify: 115 or 230v|
|10-04210||tc-gra||adapter cable for above transducer|
the bpm-832 is a dual-channel bp amplifier with wide sensitivity range and filters. has front-panel readouts for each channel. accepts standard blood-pressure and other transducers (see below).