A clamping device for flexible hoses in medical apparatus and a holding element for flexible hose clamping device in medical apparatus, wherein the device comprises: - a housing seating for receiving a tract of flexible hose; - a pinch for flexible hoses exhibiting a piston which is mobile in an axial direction, solidly bearing a pinching projecting element cooperating with a fixed element for abutting the seating for occluding, by pinching, the tract of flexible hose housed in the housing seating, the pinch being able to assume at least an open configuration in which the seating receives the tract of flexible hose and at least a closed configuration in which it occludes, by pinching, the tract of hose received in the seating, - wherein the holding element has at least a body comprising: - at least a mounting portion, removably mountable on the device for clamping flexible hoses, - at least a retaining portion for the tract of a flexible hose and - at least a support portion, interposed between the mounting portion and the retaining portion, the body being provided with at least an elastically deformable zone for enabling selective displacement of the retaining portion with respect to the mounting portion, when the holding element is mounted on the device for clamping flexible hoses, between an engaged position in which it is destined to maintain the tract of a flexible hose in position with respect to the clamping device, and at least an access position, displaced with respect to the engaged position, in which it is destined to enable insertion and/or extraction of the tract of flexible hose into and/or out of the clamping device, wherein the mounting portion is conformed in such a way as to maintain the retaining portion stably mounted on the device in the engaged position and in the access position of the retaining portion; the retaining portion being destined, in the engaging position, to maintain the tract of flexible hose in the housing seating and being destined in the access position to allow insertion or extraction of said tract of flexible hose into or from said housing seating. - a housing seating for receiving a tract of flexible hose; - a pinch for flexible hoses exhibiting a piston which is mobile in an axial direction, solidly bearing a pinching projecting element cooperating with a fixed element for abutting the seating for occluding, by pinching, the tract of flexible hose housed in the housing seating, the pinch being able to assume at least an open configuration in which the seating receives the tract of flexible hose and at least a closed configuration in which it occludes, by pinching, the tract of hose received in the seating, - wherein the holding element has at least a body comprising: - at least a mounting portion, removably mountable on the device for clamping flexible hoses, - at least a retaining portion for the tract of a flexible hose and - at least a support portion, interposed between the mounting portion and the retaining portion, the body being provided with at least an elastically deformable zone for enabling selective displacement of the retaining portion with respect to the mounting portion, when the holding element is mounted on the device for clamping flexible hoses, between an engaged position in which it is destined to maintain the tract of a flexible hose in position with respect to the clamping device, and at least an access position, displaced with respect to the engaged position, in which it is destined to enable insertion and/or extraction of the tract of flexible hose into and/or out of the clamping device, wherein the mounting portion is conformed in such a way as to maintain the retaining portion stably mounted on the device in the engaged position and in the access position of the retaining portion; the retaining portion being destined, in the engaging position, to maintain the tract of flexible hose in the housing seating and being destined in the access position to allow insertion or extraction of said tract of flexible hose into or from said housing seating.