Manufacturing ref: 3008452825-2023-00577.During an atrial fibrillation procedure, it was noted that the catheter force jumped up to 40g continuously with no variation in the graph.The force was reset but the force jumped again.No tissue contact was confirmed, and the force remained around 40g with a flat graph.Then there was an intermittent message about the catheter being disconnected.The tactisys was exchanged but with no resolution.The catheter was exchanged for a second catheter of the same lot but with no resolution.The catheter was exchanged for a third catheter of a different lot and used with the original tactisys, and the issue was resolved.There were no adverse consequences to the patient.
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Additional information: d9, g3, h2, h3 one bi-directional, curve d-f, tactiflex ablation catheter, sensor enabled was received for evaluation.Log file analysis indicated a manual reset was performed outside the patient and not after insertion into the patient on multiple occasions.Following the first insertion, a check baseline message was displayed and multiple ablation sessions were performed while the message was displayed.Following the second insertion the auto reset function worked briefly, but eventually stopped being carried out and force readings would fluctuate from baseline and eventually a check baseline message was displayed.The auto reset function has a cumulative limit to the amount of contact force reset that can be performed and if this limit is consumed the auto reset function will no longer be carried out without a manual reset being performed.The tactiflex ablation catheter sensor enabled instructions for use states "always zero the contact force reading following insertion into the patient or when moving the catheter from one chamber of the heart to another.Ensure the catheter is not in contact with heart tissue prior to zeroing.¿ additionally, the ensite x ep system contact force module instructions for use states "baseline operation should be checked regularly and if necessary reset to zero, especially under the following circumstances: after the first insertion of the catheter into the body.After reinsertion into the patient¿s body after retraction through a sheath.When the message 'check contact force baseline' displays¿" when the returned device was connected to the tactisys quartz unit, optical fibers 1-3 met specifications for optical properties and contact force was displayed and able to be reset to baseline values with no error messages noted and the deformable body thermocouple met specifications during electrical testing.In addition, the device met specifications during leak testing.The device history record was reviewed to ensure that each manufacturing and inspection operation was performed.The cause of the contact force issue and subsequent delay is consistent with a user related issue.
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