DSG™ (Dynamic Surgical Guidance) Technology

The DSG Technology is based on the principle that the electrical conductivity of tissue varies by the type of tissue. Electrical conductivity is the property of a material to conduct an electrical current. E.g.,:

  • Cortical bone has low conductivity
  • Cancellous bone has medium conductivity
  • Periosteum and blood have high conductivity

This parameter, varying conductivity, can be very helpful in differentiating between various tissue types while drilling a pedicle prior to screw placement.

How does the PediGuard® probe work?

A bipolar sensor is embedded at the tip of each PediGuard probe. A low frequency and low voltage current is pulsed through an electrode in the probe. Based on the local conductivity, the sensor can accurately inform the surgeon of the type of tissue the tip is in. This in turn can alert the surgeon prior to a cortical breach during pedicle preparation. The surgeon is informed in real time of the tissue type by changes in the pitch and cadence of an audio signal and a flashing LED light. All PediGuard probes have been programmed such that they will emit an audio signal of:

  • Low pitch at a slow cadence in cortical bone
  • Medium pitch at a medium cadence in cancellous bone
  • High pitch at a fast cadence in periosteum and blood
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