A sling blade apparatus allows percutaneous transaction of fascia or ligaments and in particular for use in transaction of the human transverse carpal ligament. A flexible sling guide is deployed percutaneously beneath the transverse carpal ligament and when drawn taut interfaces intimately with the transverse carpal ligament. The sling in turn serves as a guide along which cutting instruments can be passed to transect the ligament while simultaneously serving as a protective shield for the adjacent median nerve.
