Abstract: An electromagnetic field is applied to transplanted cells during their transplantation culturing to achieve confluence and alignment of transplanted cells into damaged tissue and organs, therefore improving the synchronization of electrical and mechanical tissue or organ functions. The electromagnetic field may be applied by catheter based devices to a selected portion of tissue or to the entire surface of a hollow body cavity or organ, such as a heart chamber. The electromagnetic field is provided by an expansible net or array from a catheter or on an inflatable balloon or stent. The electromagnetic field is also provided by an implantable net or array of electrodes which may either be hardwired to a pulse generator or coupled by means of wireless or inductive transmission.

Abstract: An electromagnetic field is applied to transplanted cells during their transplantation culturing to a chi eve confluence and alignment of transplanted cells into damaged tissue and organs, therefore improving the synchronization of electrical and mechanical tissue or organ functions. The electromagnetic field may be applied by catheter based to a selected portion of tissue or to the entire surface of a hollow body cavity or organ, such as heart chamber. The electromagnetic field is provided by an expansible net or array from a catheter or on an inflatable balloon or stent. The electromagnetic field is also provided by an implantable net or array of electrodes which may either be hardwired to a pulse generator or coupled by means of wireless or inductive transmission.

Abstract: A catheter-delivered electrode array is used to three dimensionally map the endomyocardial monophasic action potential (MAP). The catheter is used in a method for endomyocardial MAP mapping and for establishing diagnostic criteria for the cardiac myocyte injury. During allograft rejection, conduction impairment occurs within the atrial myocardium. Abnormalities of the terminal force of the P wave in Lead V1 (ptfV1) and dispersion of corrected atrial repolarization (Ta-TcD) represent interatrial conduction defects that accompanies the rejection process. Three dimensional endomyocardium monophasic action potential mappings are used to directly monitor the pathophysiological changes in cardiac myocytes. Changes in amplitude, duration and morphology of the action potential were recorded and used to detect the early rejection of the transplant organ with high sensitivity and specificity.

Abstract: An array is placed in contact with or close proximity with an organ or tissue surface to cause electroporation for gene, protein, drug delivery in both ex vivo and in vivo applications. A low DC voltage with a short pulse duration, and long burst pulse is applied to the array. A long rest period is provided between pulse bursts to allow for cell recovery. To enable the application of a low voltage shock in a large organ with same transfection efficiency, four gene, protein and drug delivery systems are illustrated.