Structure and method of switchable multi-mode dental handpiece

1 . A switchable multi-mode dental handpiece comprising:

a root canal mirror assembly comprising,

an image sensor for capturing external images, and

a flexible hose connected at one end to the image sensor and at the other end to a rigid tube, wherein pushing or pulling the rigid tube actuates extension or retraction of the image sensor within a handpiece housing, and a transmission line traversing the flexible hose and the rigid tube and connecting to the image sensor;

a root canal operation assembly comprising,

a working head mounted on a driving device,

a steering wheel connected to the driving device and fixed within the handpiece housing using bearings,

a connecting rod connecting the steering wheel for altering the angle of the steering wheel, wherein the direction of the working head changes with the angle of the steering wheel, and the transmission line connecting to the driving device; and

at least one mode switching push handle installed on the handpiece housing and slidable thereon, wherein the mode switching push handle is connected to the rigid tube and the connecting rod, and pushing or pulling the mode switching push handle downward or upward actuates extension or retraction of the image sensor and/or the working head within the handpiece housing.

2 . The switchable multi-mode dental handpiece of claim 1 , wherein the root canal mirror assembly further comprises a plurality of flexible hoses, each correspondingly connected to a plurality of rigid tubes.

3 . The switchable multi-mode dental handpiece of claim 1 , wherein the root canal mirror assembly further comprises an image sensor housing enclosing the image sensor, the image sensor housing being connected at one end to the flexible hose and having a light-transmitting portion at the other end.

4 . The switchable multi-mode dental handpiece of claim 1 , wherein the number of the at least one mode switching push handle is one, and when the mode switching push handle is pushed downward, the driving device and the working head flip upward while the image sensor retracts into the handpiece housing, and when the mode switching push handle is pushed upward, the driving device and the working head fold downward while the image sensor extends out of the handpiece housing.

5 . An operation method of the switchable multi-mode dental handpiece according to claim 1 , comprising:

pushing downward or upward the at least one mode switching push handle mounted on the handpiece housing, wherein the mode switching push handle actuates the connecting rod which rotates the steering wheel;

causing the driving device and the working head connected to the steering wheel to flip upward or fold downward through a housing opening to a handpiece head portion or retract into the handpiece housing;

wherein, during the pushing downward or upward of the mode switching push handle, the mode switching push handle indirectly pulls or extends the flexible hose by pulling the rigid tube, thereby retracting or extending the image sensor into or out of the handpiece housing.

6 . The operation method of claim 5 , wherein the number of the at least one mode switching push handle is one, and when the mode switching push handle is pushed downward, the driving device and the working head flip upward while the image sensor retracts into the handpiece housing, and when the mode switching push handle is pushed upward, the driving device and the working head fold downward while the image sensor extends out of the handpiece housing.

7 . The operation method of claim 5 , wherein the mode switching push handle comprises a first mode switching push handle for individually controlling extension and retraction of the image sensor at the handpiece head portion, and a second mode switching push handle for individually controlling upward and downward folding of the driving device and the working head.