Dental treatment instrument

A dental treatment instrument comprising:

• a first tip unit including a first tip cover and a first tip bracket element coupled to the first tip cover, wherein the first tip cover is configured to support a first tip and the first tip bracket element is detachable from the first tip cover;
• a bridge unit configured to be gripped by a user and including a bridge cover in a shape of a hollow cylinder and a bridge bracket;
• and
• a second tip unit including a second tip cover and a second tip bracket element coupled to the second tip cover, wherein the second tip cover is configured to support a second tip and the second tip bracket element is detachable from the second tip cover;
• wherein each of the first tip unit and the second tip unit is configured to be replaceable with respect to the bridge unit,
• wherein the bridge cover includes a first end and a second end and extends from the first end to the second end,
• wherein the bridge bracket is in a shape of a hollow cylinder having an inner circumferential surface and an outer circumferential surface, includes a first end and a second end and extends from the first end of the bridge bracket to the second end of the bridge bracket,
• where a length of the bridge cover from the first end of the bridge cover to the second end of the bridge cover is greater than a length of the bridge bracket from the first end of the bridge bracket to the second end of the bridge bracket,
• wherein the bridge bracket includes:
• a first lengthwise groove formed along a first lengthwise direction of the bridge bracket from the first end of the bridge bracket toward the second end of the bridge bracket,
• a first circumferential groove extending from the first lengthwise groove and formed along a first circumferential direction of the bridge bracket,
• a second lengthwise groove formed along a second lengthwise direction of the bridge bracket from the second end of the bridge bracket toward the first end of the bridge bracket, the first lengthwise direction being opposite to the second lengthwise direction, and
• a second circumferential groove extending from the second lengthwise groove and formed along a second circumferential direction of the bridge bracket different from the first circumferential direction,
• wherein each of the first lengthwise groove, the first circumferential groove, the second lengthwise groove, and the second circumferential groove is a groove passing through from a portion of the inner circumferential surface to a portion of the outer circumferential surface,
• wherein the first tip bracket element of the first tip unit includes a first tip bracket, a first tip fixing step and a first coupling end portion, and the first tip bracket extends in the second lengthwise direction from the first tip fixing step, and the first coupling end portion extends in the first lengthwise direction from the first tip fixing step and is in a shape of a cylinder having a first outer circumferential surface, and a dimeter of the first tip fixing step is larger than each of a diameter of the first tip bracket and a dimeter of the first coupling end portion,
• wherein the second tip bracket element of the second tip unit includes a second tip bracket, a second tip fixing step and a second coupling end portion, and the second tip bracket extends in the first lengthwise direction from the second tip fixing step, and the second coupling end portion extends in the second lengthwise direction from the second tip fixing step and is in a shape of a cylinder having a second outer circumferential surface, and a dimeter of the second tip fixing step is larger than each of a diameter of the second tip bracket and a dimeter of the second coupling end portion,
• wherein the first tip bracket of the first tip bracket element is provided inside the first tip cover of the first tip unit and coupled to the first tip cover of the first tip unit, and the second tip bracket of the second tip bracket element is provided inside the second tip cover of the second tip unit and coupled to the second tip cover of the second tip unit,
• wherein the first tip bracket element further includes a first coupling protrusion protruding from the first outer circumferential surface of the first coupling end portion in a radial direction vertical to the first lengthwise direction, and the second tip bracket element further includes a second coupling protrusion protruding from the second outer circumferential surface of the second coupling end portion in a radial direction vertical to the second lengthwise direction,
• wherein the first coupling protrusion of the first tip bracket element is configured to couple with the first circumferential groove of the bridge bracket by inserting the first coupling protrusion along the first lengthwise groove in the first lengthwise direction and rotating the first coupling protrusion in the first circumferential direction in a state that the first tip bracket of the first tip bracket element is provided inside the first tip cover of the first tip unit and coupled to the first tip cover of the first tip unit and the bridge bracket is provided inside the bridge cover,
• and the second coupling protrusion of the second tip bracket element is configured to couple with the second circumferential groove of the bridge bracket by inserting the second coupling protrusion along the second lengthwise groove in the second lengthwise direction and rotating the second coupling protrusion in the second circumferential direction in a state that the second tip unit and coupled to the second tip cover of the second tip unit and the bridge bracket is provided inside the bridge cover,
• wherein the first tip bracket element of the first tip unit is decoupled from the bridge circumferential direction and moving the first coupling protrusion along the first lengthwise groove in the second lengthwise direction in a state that the first tip bracket of the first tip bracket element is provided inside the first tip cover and the first tip unit and coupled to the first tip cover of the first tip unit and the bridge bracket is provided inside the bridge cover,
• wherein the second tip bracket element of the second tip unit is decoupled from the bridge bracket inside the bridge cover by rotating the second coupling protrusion in the first circumferential direction and moving the second coupling protrusion along the second lengthwise groove in the first lengthwise direction in a state that the second tip bracket of the second tip bracket element is provided inside the second tip cover of the second tip unit and coupled to the second tip cover of the second tip unit and the bridge bracket is provided inside the bridge cover,
• wherein the bridge bracket, at least a part of the first tip fixing step of the first tip bracket element, and at least a part of the second tip fixing step of the second tip bracket element are provided inside the bridge cover, and
• wherein the first tip cover of the first tip unit and the bridge cover are connected to each other at a first portion of the dental treatment instrument and have a same external diameter at the first portion of the dental treatment instrument, and the second tip cover of the second tip unit and the bridge cover are connected to each other at a second portion of the dental treatment instrument and have a same external diameter at the second portion of the dental treatment instrument.