A minimally invasive orthopedic bone attachment system comprising a pedicle screw and guide support sleeve for insertion of the screw. The first differential pair unit includes a first active load, a first transistor differential pair and a first current source. The cooler is operated to control to protect the frost on the products, once formed. The housing includes an airbag-accommodating space and laterally adjacent, but separated from the airbag-accommodating space, a gas-generator-accommodating space.