Send Html as parameter from javascript to asp.net mvc controller

I need to pass some HTML markup to the controller (please see my detalle variable), using jquery, in the action is that I have the problem when I try to send the detalle, it said that is not found, somebody can help me?

           $('#BtnPrint').click(function() {

                var detalle = "<br><br>";

                detalle += " Yo: <b>" + '@Model.DoctorText' + "</b>";
                if ('@Model.Exequartur' != "") {
                    detalle += ", exequatur: <b>" + '@Model.Exequartur' + "</b>    <br>";
                }

                detalle += "   certifico haber examinado a: <b>" + '@Model.PatientName' + "</b> <br>";
                @*if (@Model.ide != "")
                {
                    detalle += " cedula: <b>" + txtcedula.Text + "</b>    <br>";
                }*@

                detalle += " quien presenta: <b>" + '@Model.Affections' + "</b>    <br>";
                detalle += " por lo que recomiendo: <b>" + '@Model.Recomendations' + "</b>    <br>";
                detalle += "<br> dado en: <b>" + ' @Model.Place' + "</b>, " + '@Model.MedicalCertificateDate' +
                    "    <br>";
                detalle += "<br><br><br><br>  ";
                $('#myVar').val(detalle); 



            var win = window.open(
                "@Url.Action("DetailsPrint", "Reports", new {area = "Configurations", id = @Model.Patient.Person.AuthorId, body = detalle, description = "Certificado Medico"})" )  ;

                ////  var win = window.open('http://stackoverflow.com/', '_blank');
                if (win) {
                    //Browser has allowed it to be opened
                    win.focus();
                } else {
                    //Browser has blocked it
                    alert("Porfavor, debes permitir que se abran las ventanas emergentes o el reporte no va a salir :'( ");
                }

            });