A system comprising: a prosthetic heart valve comprising: a collapsible and expandable annular frame, configured to be collapsed to a radially collapsed state for mounting on a delivery apparatus and expanded to a radially expanded state inside the body; wherein the frame comprises four rows (112a, 112b, 112c, 112d) of angled struts forming three rows of hexagonal cells, wherein each of the hexagonal cells comprises six struts (144, 146, 148) including: two opposing side struts extending parallel to a flow axis of the valve, a pair of lower angled struts, extending downwardly from respective lower ends of the side struts and converging toward each other, and a pair of upper angled struts extending upwardly from respective upper ends of the side struts and converging toward each other; wherein a first row of angled struts is located at an inflow end of the frame, a second row of angled struts is located adjacent the first row of angled struts in a flow direction, a third row of angled struts is located adjacent the second row of angled struts in the flow direction, and a fourth row of angled struts is located at an outflow end of the frame, the flow direction extending along the flow axis from the inflow end to the outflow end; and a delivery catheter comprising an inflatable balloon, wherein the prosthetic heart valve is crimped in its radially compressed state on the balloon of the delivery apparatus, and wherein the balloon is configured to be inflated to expand to radially expand the prosthetic valve at the desired deployment location, preferably within a native aortic valve. a prosthetic heart valve comprising: a collapsible and expandable annular frame, configured to be collapsed to a radially collapsed state for mounting on a delivery apparatus and expanded to a radially expanded state inside the body; wherein the frame comprises four rows (112a, 112b, 112c, 112d) of angled struts forming three rows of hexagonal cells, wherein each of the hexagonal cells comprises six struts (144, 146, 148) including: two opposing side struts extending parallel to a flow axis of the valve, a pair of lower angled struts, extending downwardly from respective lower ends of the side struts and converging toward each other, and a pair of upper angled struts extending upwardly from respective upper ends of the side struts and converging toward each other; wherein a first row of angled struts is located at an inflow end of the frame, a second row of angled struts is located adjacent the first row of angled struts in a flow direction, a third row of angled struts is located adjacent the second row of angled struts in the flow direction, and a fourth row of angled struts is located at an outflow end of the frame, the flow direction extending along the flow axis from the inflow end to the outflow end; and a collapsible and expandable annular frame, configured to be collapsed to a radially collapsed state for mounting on a delivery apparatus and expanded to a radially expanded state inside the body; wherein the frame comprises four rows (112a, 112b, 112c, 112d) of angled struts forming three rows of hexagonal cells, wherein each of the hexagonal cells comprises six struts (144, 146, 148) including: two opposing side struts extending parallel to a flow axis of the valve, a pair of lower angled struts, extending downwardly from respective lower ends of the side struts and converging toward each other, and a pair of upper angled struts extending upwardly from respective upper ends of the side struts and converging toward each other; two opposing side struts extending parallel to a flow axis of the valve, a pair of lower angled struts, extending downwardly from respective lower ends of the side struts and converging toward each other, and a pair of upper angled struts extending upwardly from respective upper ends of the side struts and converging toward each other; wherein a first row of angled struts is located at an inflow end of the frame, a second row of angled struts is located adjacent the first row of angled struts in a flow direction, a third row of angled struts is located adjacent the second row of angled struts in the flow direction, and a fourth row of angled struts is located at an outflow end of the frame, the flow direction extending along the flow axis from the inflow end to the outflow end; and a delivery catheter comprising an inflatable balloon, wherein the prosthetic heart valve is crimped in its radially compressed state on the balloon of the delivery apparatus, and wherein the balloon is configured to be inflated to expand to radially expand the prosthetic valve at the desired deployment location, preferably within a native aortic valve.