An interventional apparatus for performing an interventional procedure, wherein the interventional apparatus comprises: - an elongated interventional device comprising a first lumen accommodating an optical shape sensing fiber for allowing optical shape sensing for a determination of a position of the interventional device by optical shape sensing and a second lumen for accommodating an elongated interventional instrument, - an optical shape sensing device for determining the position of the elongated interventional device by optical shape sensing by using the optical shape sensing fiber, characterized in that the interventional apparatus further comprises: - a handle comprising a) a first guide (20, 51) for guiding the optical shape sensing fiber, which is also guided within the interventional device, from a first proximal opening of the handle to a distal portion of the handle, wherein the distal portion of the handle is adapted to be connected to a proximal portion of the interventional device, wherein the first guide (20, 51) only has radii of curvature being larger than 10 mm, and b) a second guide for guiding an elongated interventional instrument from a second proximal opening of the handle to the distal portion of the handle, wherein portions of the first guide and the second guide close to the first proximal opening and the second proximal opening are parallel to each other, and wherein the interventional device and the handle are attached to each other such that the optical shape sensing fiber is guided from the first proximal opening of the handle to the distal portion of the handle and then into the first lumen of the interventional device and such that the interventional instrument is guidable from the second proximal opening of the handle to the distal portion of the handle and then into the second lumen of the interventional device. - an elongated interventional device comprising a first lumen accommodating an optical shape sensing fiber for allowing optical shape sensing for a determination of a position of the interventional device by optical shape sensing and a second lumen for accommodating an elongated interventional instrument, - an optical shape sensing device for determining the position of the elongated interventional device by optical shape sensing by using the optical shape sensing fiber, characterized in that the interventional apparatus further comprises: - a handle comprising a) a first guide (20, 51) for guiding the optical shape sensing fiber, which is also guided within the interventional device, from a first proximal opening of the handle to a distal portion of the handle, wherein the distal portion of the handle is adapted to be connected to a proximal portion of the interventional device, wherein the first guide (20, 51) only has radii of curvature being larger than 10 mm, and b) a second guide for guiding an elongated interventional instrument from a second proximal opening of the handle to the distal portion of the handle, wherein portions of the first guide and the second guide close to the first proximal opening and the second proximal opening are parallel to each other, and wherein the interventional device and the handle are attached to each other such that the optical shape sensing fiber is guided from the first proximal opening of the handle to the distal portion of the handle and then into the first lumen of the interventional device and such that the interventional instrument is guidable from the second proximal opening of the handle to the distal portion of the handle and then into the second lumen of the interventional device. - a handle comprising a) a first guide (20, 51) for guiding the optical shape sensing fiber, which is also guided within the interventional device, from a first proximal opening of the handle to a distal portion of the handle, wherein the distal portion of the handle is adapted to be connected to a proximal portion of the interventional device, wherein the first guide (20, 51) only has radii of curvature being larger than 10 mm, and b) a second guide for guiding an elongated interventional instrument from a second proximal opening of the handle to the distal portion of the handle, wherein portions of the first guide and the second guide close to the first proximal opening and the second proximal opening are parallel to each other, and wherein the interventional device and the handle are attached to each other such that the optical shape sensing fiber is guided from the first proximal opening of the handle to the distal portion of the handle and then into the first lumen of the interventional device and such that the interventional instrument is guidable from the second proximal opening of the handle to the distal portion of the handle and then into the second lumen of the interventional device.