Patent ID: 11931309
Assignee: SUNCALL CORPORATION
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 1:
2. The actuator unit according to claim 1, wherein:
the spherical head part has a large diameter part having the largest diameter, a distal end-side spherical surface part, a diameter of which is reduced toward a distal end side from the large diameter part, and a proximal end-side spherical surface part, a diameter of which is reduced toward a proximal end side from the large diameter part;
the accommodation depression is provided with an annular engagement groove at a portion, which the proximal end-side spherical surface part of the spherical head part faces when the spherical head part is accommodated in the accommodation depression;
a retaining member is inserted into the annular engagement groove; and
the retaining member is shaped such that a force for expanding the retaining member in a radially outward direction is exerted on the retaining member by a movement of the spherical head part in an axial direction, and the retaining member is inserted into the annular engagement groove to prevent passage of the large diameter part of the spherical head part when the force resulting from the movement of the spherical head part in the axial direction is equal to or less than a predetermined value and to be elastically deformed in the radially outward direction by the spherical head part and permit passage of the large diameter part of the spherical head part when the force exceeds the predetermined value.