Company insight
Secure push-pull connectors and cables
LEMO has a reputation for offering high-quality, push-pull connectors and cable assemblies to the medical industry. It has a wide array of both technical and manufacturing expertise, which it provides to customers to drive future medical device development.
EMO’s latest release of IEC 60601 brings protection against electrical hazards to higher standards. This impacts medical device interconnections in three specific aspects. The first is increased ESD protection threshold from eight to 15kV. The second is increased means of patient protection or means of operator protection (MOPP/ MOOP) values and redefinition of clearance and creepage requirements. The third is the application of the above improvements to normalised finger tests.
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LEMO can help with: ■Advising on cable assembly techniques with solutions, such as the use of dielectric barriers in the form of heat shrink tubing on contact terminations.
■Sleeved contacts, which increase the separation distance during mated and unmated condition.
■Compliant product with insulation barriers to increase the separation distances at the rear of the connector. This is also possible with PCB- mounted connectors.
■Compact designs to make the most efficient use of the space available.
ESD protection
The purpose of electrostatic discharge (ESD) protection is to avoid voltages from medical devices coming into contact with operators. The new IEC60601-1 defines an increased value of 15kV as a minimum insulation voltage between conductors and the operator in a mated condition.
LEMO offer solutions to achieve this. For example, on the REDEL P series, it can either select a thicker dress nut that can also add IP66 sealing or utilise high voltage inserts that significantly increase the creepage and clearance distances. Alternatively, all models in the SP series
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“LEMO offers most of its configurations in both standard and reverse gender allowing customers maximum flexibility in its designs.”
The IEC 60601-1 (3rd edition) differentiates between the risk to patients and the risk to operators. A MOP can therefore be classified as MOPP/MOOP. When applied to connectors, the typical values to consider for MOOP/MOPP compliances are pin-to-pin creepage and clearances distances defined for several voltage classes in the IEC 60601 standard. LEMO offers MOPP/ MOOP models with
protection, care should be taken in designing the system with consideration given to the direction of current or voltage. For example, supplying the power through the less accessible side or socket style contacts. LEMO offers most of its configurations in both standard and reverse gender, allowing customers flexibility in its designs. ●
www.lemo.com Medical Device Developments /
www.nsmedicaldevices.com
LEMO’s equipment ensures that vital medical locations have safe electrical connections.
fulfil this requirement because of the design, which features the unique and patented inner locking mechanism.
Means of protection
Medical devices must incorporate two means of protection (MOP) to isolate patients and operators from the risks of electrocution. A MOP can be safety insulation, a protective earth, a defined creepage distance or an air gap (clearance). These can be used in various combinations.
specially qualified inserts in both REDEL 1P or 2P series.
Test finger
Finger test conformity is the third aspect of operator and patient protection – the design guarantees that no access is possible to the electrical contacts. This geometrical barrier prevents the risk of electrical shock when unmated. The test is performed using the normalised test finger according to IEC 61032. Although the compliant inserts offer
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