Wuxi Ea Biotechnology Limited

Shanghai Kindly Enterprise Development Group Co. Ltd.

Junsheng Li

Jian Li

Ketuo Zhou

In one aspect of the present application, a shell-shaped tooth repositioner is provided, it comprises: N successive shell-shaped tooth repositioners corresponding to N successive steps, respectively, where each of the N shell-shaped tooth repositioners is for repositioning teeth from an initial tooth arrangement of a corresponding step to a target tooth arrangement of the corresponding step, where a first bite plate is provided on a lingual side of a portion corresponding to a first tooth of each of the N shell-shaped tooth repositioners, for opening bite of anterior teeth, where relative positions between the first bite plates on the N shell-shaped tooth repositioners and the first tooth are such that each of the N shell-shaped tooth repositioners is able to open bite of the anterior teeth to an extent that is substantially consistent with a target extent, where N is a natural number greater than 3.

Shell-shaped tooth repositioner

A safe medical needle apparatus, including a needle duct having a needle head, a needle seat, in which the needle tail is installed; a safe protecting shell and a biasing part through which the needle duct can pass; A protuberant stop portion, which is provided on the outer surface of the needle duct near the needle head, and the maximum size of cross section thereof is larger than the outer diameter of the remainder of the needle duct; the safe protecting shell there inside includes sequentially a biasing part cavity near the outlet, a protecting cavity, the across section of which is smaller than the biasing part cavity, a stop portion of the protecting shell and a needle seat cavity near the inlet of the needle duct and matching the needle seat; the size of the stop portion of the protecting shell is smaller than the maximum size of the stop portion of the needle duct, making the needle duct be movable therein but the stop portion of the needle duct be locked thereby, wherein a side of the biasing part cavity having a releasing port. Said biasing part is elastic and includes a through hole, under action of a external force the biasing part is contained in the biasing part cavity and is so biased that the needle duct can pass the through hole, and if the external force is removed, the through hole displaces and staggers with the needle duct under the action of the elasticity.

Growing community of inventors

Shanghai, China

Junsheng Li