Handle for a surgical instrument with a handle element, a supply tubing set with at least two parallel guided supply line elements (13, 23), at least one application probe with at least two coaxially guided application line elements (12, 22), wherein each supply line element (13, 23) in the handle element can be connected to as associated application line element (12, 22), and a fluid-switch element for fluid-conductive attachment of the at least one application probe to the supply tubing set, wherein the fluid-switch element is arranged as an autonomous component in the handle element of the surgical instrument for fluid-conductive attachment of the application probe to the supply tubing set, wherein in the attached state, each supply line element (13, 23) is in fluidic connection with at least one associated application line element (12, 22), wherein the fluid-switch element furthermore comprises: - an application line attachment region with an integrally formed receiving region for coaxial attachment and fluid-tight connection of the application line elements (12, 22) inside the receiving region to the fluid-switch element, - a supply line attachment region with an integrally formed receiving region for attachment and fluid-tight connection of the supply line elements (13, 23) inside the receiving region to the fluid-switch element, and - at least two bridging elements (16, 26) which are formed integrally in the fluid-switch element and via which the application line attachment region is in fluidic connection with the supply line attachment region, wherein the supply line attachment region and the application line attachment region are arranged in the receiving region (17, 19) formed integrally in the fluid-switch element such that they do not protrude beyond the outer geometry of the fluid-switch element, and - an application probe receiving region for releasable receiving of the application probe, which has at least one locking means via which the application probe can be locked releasably to the fluid-switch element without tools, - wherein the fluid-switch element is configured as a one-piece turned or milled part. - an application line attachment region with an integrally formed receiving region for coaxial attachment and fluid-tight connection of the application line elements (12, 22) inside the receiving region to the fluid-switch element, - a supply line attachment region with an integrally formed receiving region for attachment and fluid-tight connection of the supply line elements (13, 23) inside the receiving region to the fluid-switch element, and - at least two bridging elements (16, 26) which are formed integrally in the fluid-switch element and via which the application line attachment region is in fluidic connection with the supply line attachment region, wherein the supply line attachment region and the application line attachment region are arranged in the receiving region (17, 19) formed integrally in the fluid-switch element such that they do not protrude beyond the outer geometry of the fluid-switch element, and - an application probe receiving region for releasable receiving of the application probe, which has at least one locking means via which the application probe can be locked releasably to the fluid-switch element without tools, - wherein the fluid-switch element is configured as a one-piece turned or milled part.