| 摘要 |
Rapid palatal expander which comprises an actuator element (2) provided with a drive head (3) and with two stems (4) with opposite threads, as well as a first and a second main body (5, 6) provided with aligned female threads (7, 8) that are each engaged by a threaded stem (4) of the actuator element (2). Guide means (9) are provided for guiding the simultaneous movement of the main bodies (5, 6) along the longitudinal extension direction Y of the actuator element (2) following the rotation of the drive head (2). Such guide means (9) comprise: a first and a second pair of rods (11, 12), which are fixed in a single body with the first and the second main body (5, 6), respectively, and are slidably mutually engaged with each other in a form relationship in order to guide the movement of the two main bodies (5, 6) with a single degree of freedom in the aforesaid longitudinal direction (Y). |
| 主权项 |
1. Rapid palatal expander which comprises:
a rod-shaped actuator element (2) with main extension in a longitudinal direction (Y), provided with a drive head (3) arranged in a substantially median position thereof, and with two stems (4) which are extended aligned in opposite directions from said drive head (3), with threads in opposite senses provided, a first and a second main body (5, 6) provided with corresponding opposite first and second front face (5A, 6A) with respective female threads (7, 8) obtained aligned, each engaged by a threaded stem (4) of said actuator element (2); guide means (9) for guiding the simultaneous movement of said main bodies (5, 6) along said longitudinal direction. Y following the rotation of said drive head (2); characterized in that said guide means (9) comprise: at least one first rod (11), which is fixed in a single body with said first main body (5), from whose first front face (5A) such rod is extended towards said second main body (6); at least one second rod (12), which is fixed in a single body with said second main body (6), from whose second front face (6A) such rod is extended towards said first main body (5); said first and said second rod (11, 12) being at least partially slidably and mutually engaged with each other in a faun relationship in order to guide the movement of said first and second main body (5, 6) with a single degree of freedom in the aforesaid longitudinal direction (Y). |
