Who is CDI?
CDI designs and markets high-end medical grade AC to DC custom and standard power supplies. These are primarily intended for OEM medical device applications. Our medical power supply products are smaller, more robust and more efficient than competing products, offering medical device manufacturers numerous practical and economic benefits. We have been doing this since 1979 when the company was founded.
Do you make dc to dc converter modules?
No we do not make dc to dc converters and are often mistaken for a company with a similar name. We have no affiliation with this company or organization.
Can CDI design custom medical power supplies?
CDI has been designing and manufacturing complex custom medical power supplies for almost three decades. These designs range from a 200 WATT four output power supply for patient eye diagnostics to a 9-output 1KW ultrasound power supply. Many of our custom and standard power supplies deliver medical power for; patient monitors, respiratory systems and ophthalmic surgical devices. These require stringent safety certifications for patient-connected equipment meeting the needs of worldwide medical safety standards.
What is a medical power supply?
Commercial power supplies are typically built to the IEC950 or UL 1950 standards. A true medical power supply must comply with IEC601-1 or UL 60601-1 (formerly UL 2601-1). The primary differences between commercial and medical power supplies address the need to eliminate shock hazard to patients and the medical teams that care for them. Medical power supplies must also comply with the IEC requirement CISPR11 (for industrial, scientific, and medical apparatus) that addresses EMC limits.
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How does UL60601-1 differ from UL2601-1
UL 2601-1 is identical in content to UL 60601-1. The only difference between them is how the material is organized. UL 2601-1 contained the entire text of IEC 60601-1, the US differences in the front, and the two amendments in the back. This format was difficult to use, since the material was in three separate locations.
UL 60601-1 integrated the US differences and the two amendments directly into the text of IEC 60601-1, which made it easier to use. There were no technical changes.
How are CDI's medical power supplies different from commercial power supplies?
When designing Medical Devices, a consideration for safety takes precedence over all others. Several factors contribute to effective isolation, including spacing between conductive parts. Although IEC 60601 standards lay down minimum spacing distances, it is important to note that these are greater than spacing distances prescribed by relevant standards for commercial use power supplies.
A Medical power supply must also be able to withstand various hi-pot potentials based on the maximum line voltage and the level of insulation used. To meet this standard reinforced or double insulation is required in supplies that for example operate from a 240Vac mains. Medical power supplies must withstand a dielectric test at 4kVac for medical applications, whereas the corresponding number for commercial use is just 3kVac.
Leakage current specifications for all IEC601-1 approved power supplies are more stringent than for non-medical units. The maximum permissible earth leakage is 300μA for worldwide approvals, but this figure applies to the medical device as a whole, not just the power supply. To allow for additional leakage in other system components a medical power supply should have an even lower leakage current than the system requirement. CDI offers custom and catalog power supplies with leakage currents from 50uA to 135uA at 120Vac.
What about EMC?
A medical power supplies EMC performance is an issue for medical applications. All modern power supplies are switch-mode designs. Unfortunately, switch-mode supplies generate electromagnetic interference and require filters to limit the effect. CDI’s solution is to minimize the amount of interference the power supply generates in the first place. Our new "Eagle II Series" utilizes ZVS technology. The amount of electromagnetic interference generated is greatly reduced and a small onboard filter enables the power supplies to meet the most demanding EMC requirements for electronic equipment commonly used in hospitals, clinics and doctors offices.
What do these benefits mean to the Medical Device OEM?
CDI products offer medical device manufacturers greater design flexibility and lower overall system costs with our catalog "Eagle Series" power supplies. The models offer small footprints, and numerous voltage and current combinations. This gives design engineers the ability to reduce the overall size of their products and the flexibility to change voltages without impacting product safety certification.
What are CDI's target markets?
While the Company’s products are suitable for virtually any medical electronics application requiring a power supply, CDI is initially focusing on high technology markets that offer the best potential for near-term market penetration and profitability. These include ultrasound, surgical, ophthalmic surgical, ventilator and diagnostic equipment markets.
Does CDI intend to offer additional products?
We are presently working on our next generation hi-efficiency, ZVS designs that will utilize tomorrow’s technology today. We plan to address a broader range of medical power supply applications. We expect to introduce much of our next product family in 2008. You can often view these product specifications on our website products page noted as "Coming Soon".
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