Method of implantation of left ventricular mechanical assist device HeartMate III
View Patent ↗The invention relates to medicine, namely to cardiac surgery. The object of the invention is to raise the effectiveness of implantation of the HeartMate III left ventricular assist device by minimizing postoperative complications and improving the long-term results of device operation. The HeartMate III left ventricular assist device is implanted in compliance with the phased nature of the procedure. The site of implantation of the outflow cannula is carefully selected. The proposed method of implantation of the HeartMate III left ventricular assist device makes it possible to minimize the surgical causes of device thrombosis and bleeding, to avoid kinking of the outflow graft, to reduce the percentage of development of infection complications of the cable exit region, and thus to improve the long-term results of device operation.
1. A method of implantation of a left ventricular assist device including placement of the device in the left ventricle of a patient, comprising:
connecting the patient to a parallel cardiopulmonary bypass (CPB);
performing the following steps;
(i) while monitoring the patient by transesophageal echocardiography, selecting a site for placement of an inflow cannula,
(ii) implanting a sewing cuff using pi-shaped sutures with synthetic pledgets, by sewing through an entire thickness of the myocardium thereby fixing edges of the sewing cuff at a left ventricular chamber side, such that when the sutures are tied the pledgets are completely on an outside of the sewing cuff thereby adequately sealing a fixation region of the sewing cuff to minimize probability of bleeding,
(iii) connecting the device to the sewing cuff and placing the device intrapericardially,
(iv) tunneling a driveline by making a skin incision longitudinally with a scalpel for improving healing of an output region of the driveline, and leaving a loop of the driveline intrapericardially to maintain externalization of a silicone part of the driveline,
(v) creating an anastomosis between an outflow graft and ascending aorta, while performing de-airing prior to and after said anastomosis, and affixing a bend-relief after the creation of the anastomosis between the outflow graft and the ascending aorta, to avoid kinking of the outflow graft,
(vi) after formation of proximal anastomosis, and prior to removal of a vascular clamp from the outflow graft, activating the left ventricular assist device disconnecting the CPB from the patient.
2. The method according to claim 1 , wherein said selecting a site for placement of the inflow cannula and said sewing of the sewing cuff is performed by using a technique of “cut then sew”.
3. The method according to claim 1 , wherein said implantation of the sewing cuff is performed by a hemostatic and non-obstructive technique comprising:
forming a first pair of first and second perforations by a first needle performing a maneuver, wherein the first perforation is formed by the needle passing through the entire thickness of the myocardium at a distance of about 1-1.5 cm from an edge of the incision, and is followed by the second perforation formed by the needle, which while returning back, passes through a middle of the thickness of the myocardium on the outside thereof at a distance of about 5 mm from the edge of the incision; and
forming a second pair of the first and second perforations using a second needle performing said maneuver.
4. The method according to claim 1 , wherein an operational speed of the device is selected with allowance for adequate unloading of the left ventricle and an even position of the interventricular septum.
5. The method according to claim 1 , wherein in order to avoid deformation of the driveline, an internal part of the driveline is not fixed, so as to ensure some mobility in the event the patient gains weight, and an outside part of the driveline is fixed to the skin using a silicone tube around 10 cm long and two sutures for a 1 month time period.