Ohmeda Modulus® CD Anesthesia System 

The first true choice in sophisticated data management

Modulus CD: the computer-based, human factors-engineered anesthesia workstation
The Modulus CD is another technological first from Ohmeda. It is the first true choice in sophisticated data management, the first computer-based anesthesia system. And it is the first to offer vital data that is rationalized, managed and clearly presented to deliver the performance critical in demanding cases. For all its sophistication, the Modulus CD is easy to operate. Its controls are logically positioned for intuitive operation. A complete, ergo- nomically advanced anesthesia workstation, the Modulus CD combines unique capabilities in ventilation, drug delivery, gas delivery and data management. Computerization is the core of the Modulus CD. Its data processing architecture meets current performance standards for expansion, speed and processing power. So the Modulus CD goes beyond the assembling of raw data to actually manage information to help capture the nuances of patient and system performance.

Modulus CD displays and controls can be viewed 
from up to 45° overhead, accommodating users 
whether they prefer to sit or stand. 

A multidisciplinary approach to ergonomics
The Modulus CD is unique to anesthesiology for another important reason. It draws together the best of many disciplines from inside and outside the professional community.

System ergonomics are patterned after advanced human factors engineering concepts. Two 9" CRTs present clearly defined amber characters on a black field. This screen size allows use of large characters for alphanumeric data, and for the graphic information presentations that are central to the system's data management.

These displays and their controls can be viewed from at least 45° left and right of center, and from up to 45° overhead to accommodate most users whether they prefer to sit or stand.

Unlike remotely mounted displays, the Modulus CD display module is integrated into the anesthesia system where it is protected from breakage and remains out of the way. Yet, it is positioned near the patient's head to allow simultaneous viewing of the patient and monitored variables.

Even the alarm audio system was specially researched, emulating the latest philosophies of the aerospace industry. The result is a highly advanced, prioritized strategy assisting the clinician in the early recognition of alarm conditions and their relative urgency.

A new platform for evolution
Continuing the pacesetting concept of expansion associated with the Modulus name, the Modulus CD establishes a new platform for anesthesia system evolution. With its computer architecture and disk drive, the system can easily be expanded over time. Newly developed technologies can be added as they become available, keeping the system up to date and helping to protect the hospital's investment.

Technology for advanced data management
The Modulus CD System is unique in its approach to information management. Monitored data can be displayed in quantitative formats, or in qualitative presentations which allow the clinician to visualize patient status at a glance.

The System incorporates both patient and machine monitoring, including measurement of:

• Oxygen concentration
• Oxygen saturation
• Exhaled volume
• Airway pressure
• Non-invasive BP
• Heart rate
• Respiratory rate
• Carbon dioxide
• Nitrous oxide
• Anesthetic agent

The Modulus CD System utilizes high-level monitoring technologies, most of which are proprietary to Ohmeda. The blood pressure monitor is based on DINAMAP™ Monitor technology.

Upper display The upper display screen offers a choice of three presentations:
The analog display replaces a traditional bar graph with a graphic presentation allowing visualization of data at a glance. Shaded areas represent "out of alarm limits" for the monitored variables; diamond-shaped markers in the unshaded areas indicate real time status of each variable.
The polygon display is an alternate graphic presentation of the key monitored variables. The shaded polygon deforms from an equilateral shape as changes occur. By watching this deformation and comparing it to the dotted perimeter, the clinician may quickly detect changes.
The numeric display shows data identical to the analog and polygon displays in the same relative order, but in digital format. Character style and large character size enhance readability.

Lower display The lower screen allows another series of data display options. Available are waveforms, graphic trends, digital trends, ventilation information and pre-use checklists.	All data on the upper real time display is available in trended form on the lower display.
The primary display presents the SPO2, plethysmograph and CO2 waveforms as well as 20-minute trend data for SPO2, CO2, and non-invasive blood pressure.
The graphic trend display shows all the monitored variables in 1-hour, 3-hour or 3 to 6-hour durations.
The digital trend display provides trended data for all variables at 20-second, 1-minute, 5-minute, 10-minute, or 1-hour intervals. In addition, the instantaneous recordings of up to 15 events can be simultaneously displayed.
The ventilation display indicates the primary ventilation parameters: minute and tidal volumes, minimum and plateau airway pressures, and waveforms for airway pressure and CO2.

Technology that assists at each step

Using the upper screen displays to detect change
The Modulus CD features an Alert Zone system which can be employed to inform the clinician of a change in the patient's condition before it reaches crisis proportions. This unique system places an operating range around each monitored variable, and indicates when patient values drift beyond that range.

Alert Zones are graphically depicted by dashes in the analog format. On the polygon, the outer points represent the upper Alert Zone limits; the inner points indicate the lower limits.

Computerization enhances total system performance

New technology for alarm management
The Modulus CD alarm management system is another example of carefully researched Ohmeda technology. Designed to meet the latest international aerospace design standards, the alarm system displays messages for more than 75 different conditions. These messages are categorized into three levels, with differing audio tones. Together, they help to alert the clinician, without being annoying.

Assists the clinician pre-operatively
The Modulus CD can aid in the pre-operative phase with built-in checklists. As with other functions, these checklists are simple to use; merely touch the "Checklist" key to flow from step to step.

Advanced technology also means ease of use
The Modulus CD is a logical system of intuitive operation. Its design allows direct access to operating features, eliminating complex menus, "hidden" systems and time-consuming page-by-page selection. Direct- keys simplify operation by controlling alarm management, display format and system configuration, all of which are grouped by function,

There are a number of display parameters that can be changed, depending on case needs. This can be accomplished manually at any time or the clinician can establish auto setup configurations that can be used to recall the desired parameters. These can be entered, for example, by doctor name or case type. Once saved in computer memory, the clinician can call up a configuration and use it, or change it to another configuration mode, with a simple selection.

The variables which can be saved include:

• Alarm limits
• Alert Zone widths
• Graphic trend duration
• Digital trend interval
• Manual setup page selections
• Non-invasive BP interval
• Alarm volume level
• Printer logging intervals

The logical platform for expansion
The Modulus CD was designed from the outset for expansion through the use of a standard computer architecture with a built-in disk drive. This powerful computerization offers the advantages of fast, economical upgrading and expansion through disk-based software loaded into the computer using the disk drive. To complement expansion, control key labels can be easily upgraded through interchangeable panel faceplates. Select Ohmeda software upgrades are provided free as part of standard Modulus CD service programs. Other enhancements, some including software and hardware, are available as options to Modulus CD users.

One example of a major expansion component is an integrated SpaceLabs cardiovascular package. This package includes ECG, invasive blood pressures and temperatures.

Computerization also yields speed, memory and storage comparable to a personal computer. Through the disk drive, the Modulus CD can automate documentation: up to 100 variables at 20-second intervals over 9 hours can be logged onto a 3.5-inch diskette.

To accommodate increasing documentation and processing requirements, the System includes serial outputs for printer or computer interfacing.

Modulus CD System: the comprehensive anesthesia workstation

Every aspect of the Modulus CD addresses the trend toward the complete workstation: monitoring, data management, ventilation and drug delivery.

Ventilation that helps over the ups and downs
In addition to its other advances, the Modulus CD offers a combination of microprocessor-controlled electronics and state-of-the-art pneumatics in ventilation, through the Ohmeda 7800-series Ventilator.

Wide performance range.
A 50-1500 mL tidal volume range improves the ability of the ventilator to deliver both high and low tidal volumes. The breath rate range is 2-100 B/min, while a 10-100 L/min flow rate range allows delivery of high rates. For any combination of set tidal volume and respiratory rate, automatic adjustment of the I:E ratio is provided through the Inspiratory Flow control. This expands the range of achievable I:E ratios, including inverse ratios.

When selected, the inspiratory pause system adds a pause to the end of the inspiratory cycle, equivalent to 25% of inspiratory time. By improving peripheral distribution of gases, this pause can be an important aid in managing patients with significant airway resistance. Ventilation with the Modulus CD is easy to use, with the capability needed for pediatrics, respiratory disease, obesity and trauma cases.

Integrated safety.
The ventilation system allows selection of an adjustable inspiratory pressure limit from 20 to 100 cmH2O, allowing the user to set the inspiratory pressure limit just above the patient's peak airway pressure as a guard against barotrauma. During mechanical ventilation, the pressure relief system helps to protect against overinflation of the lung by terminating inspiration if airway pressure exceeds the set limit.

The ventilation display provides backup to the Modulus CD System computer. In the event of a System failure or power outage, important monitoring data transfers to the ventilator display to continue monitoring and maintain primary information display.

Protection against barotrauma: adjustable vs. fixed inspiratory pressure limit

Simulation of total occlusion of the expiratory hose: A. In a ventilator with a high, fixed maximum pressure limit (100 cmH2O), airway pressure rises continuously following occlusion of the expiratory patient hose, until the pressure limit is reached. B. With the Ventilator of the Modulus CD, the maximum pressure limit is user adjustable. Despite occlusion, pressure within the circuit remains below the selected limit of 30 cmH2O.

Tec 6 Vaporizer: a vaporizer as sophisticated as Suprane® (desflurane) itself
With the introduction of Suprane®, you now have a uniquely controllable agent that allows rapid uptake and elimination as well as fast, precise control of anesthesia depth.

Taking advantage of these singular characteristics requires a special delivery device. The Tec 6 Vaporizer created by Ohmeda.

The Tec 6 has a large 425 mL sump capacity to accommodate nearly two full bottles of Suprane®. This allows the vaporizer to be used for extended periods before refilling. And, refilling itself can be done while the vaporizer is in use.

The Tec 6 features a number of innovative intra-vaporizer monitors and alarms. It constantly monitors agent status, with an LCD display to clearly indicate agent quantity and a warning if agent level is low. It will even determine if the Tec 6 has been tilted during use, and signal you that output has been shut off.

A separate group of electronic indicators--no output, low agent, warm-up, operational and alarm battery low-- advise you of vaporizer status. The low agent alarm will provide an alert when the level of agent in the sump drops to 50 mL. And the no output alarm is battery backed to help maintain alert status even if power is lost.

Tec 5 Vaporizers: technically advanced for performance, safety
The Tec 5 is the latest in the Ohmeda line of anesthetic agent vaporizers. It offers significant performance and convenience benefits, coupled with important safety features, to improve management of volatile anesthetic agents. All agent-specific Tec 5 models provide essentially constant output through the complete flow range, from 200 mL/min to 15 L/min. They accommodate 225 mL of free anesthetic agent, minimizing the frequency of refilling.

Tec 5 Vaporizers also enhance safety. The proven Selectatec® SM Manifold on the Modulus CD locks the Tec 5 in place, helping to prevent simultaneous activation of more than one vaporizer. Further protection is provided by a unique isolation system which guards against agent mixing by diverting gas flow around, rather than through, the unactivated Tec 5 Vaporizers.

The Tec 6 interlocks in series with Tec 5 and Tec 4 Vaporizers on the Ohmeda Selectatec® backbar.

The accuracy you expect from Ohmeda

Modulus CD flowmeters are backlit with fiberoptic lighting, allowing widely adjustable intensity and even light distribution.

Optional GMS Absorber incorporates a one-piece manifold with molded-in gas passages for inhalation/exhalation check valves, APL valve and switch valve to reduce connections and the associated risk of leaks. The bag-to-ventilator switch is bi-stable.

Optional cable management arm helps organize cables, tubes, sample lines and other leads between patient and system.

Planned for serviceability
The Modulus CD addresses not only clinical requirements but the practical issue of serviceability.

Though completely integrated, each individual patient monitor remains a discrete module. If a monitor requires replacement, the Modulus CD as a whole is unaffected, and the monitor can be changed by merely opening a "drawer" and replacing a module.

Other vital components are also modular. Major electronic components can be changed by replacing accessible circuit boards. Pneumatic components are designed for easy exchange by Ohmeda service technicians or properly trained biomedical engineers.

Dedicated to Anesthesia and Critical Care

Ohmeda Modulus CD