The reported event of helix mechanism issue was confirmed while the reported event of unable to implant and lead dislodgement were not confirmed.As received, a complete lead was returned in one piece.For analysis.Visual inspection found the helix extended, bent, stretched, and clogged with blood.X-ray examination found the inner coil over-torqued consistent with procedural damage.The cause of helix mechanism issue was isolated to the helix being damaged, clogged with blood, and over-torque of the inner coil.
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