Transcutaneous analyte sensors, applicators therefor, and associated methods
The present embodiments relate generally to applicators of on-skin sensor assemblies for measuring an analyte in a host, as well as their method of use and manufacture. In some aspects, an applicator for applying an on-skin sensor assembly to a skin of a host is provided. The applicator includes an applicator housing, a needle carrier assembly comprising an insertion element configured to insert a sensor of the on-skin sensor assembly into the skin of the host, a holder releasably coupled to the needle carrier assembly and configured to guide the on-skin sensor assembly while coupled to the needle carrier assembly, and a drive assembly configured to drive the insertion element from a proximal starting position to a distal insertion position, and from the distal insertion position to a proximal retraction position.
1. A needle hub for applying an on-skin sensor assembly to a skin of a host, the needle hub comprising:
a base comprising an anti-rotation feature, the base configured to be at least partially disposed in a first aperture of an on-skin sensor assembly,
wherein the needle hub is configured to couple with an insertion element; and
wherein the base comprises a flat surface configured to mate with a top surface of the on-skin sensor assembly, thereby maintaining the insertion element in a substantially perpendicular orientation to the top surface of the on-skin sensor assembly.
2. The needle hub of claim 1 , wherein the anti-rotation feature is configured to prevent rotation of the base within the first aperture.
3. The needle hub of claim 1 , wherein the anti-rotation feature comprises a key having a shape complementary to at least a portion of the first aperture.
4. The needle hub of claim 1 , further comprising at least one upper arm.
5. The needle hub of claim 1 , further comprising at least one lower arm.
6. The needle hub of claim 5 , wherein the at least one lower arm is configured to contact a lower surface of a needle carrier assembly adjacent to a second aperture in the needle carrier assembly.
7. The needle hub of claim 1 , wherein the insertion element comprises a needle.
8. The needle hub of claim 7 , wherein the needle comprises an open side configured to receive a sensor of the on-skin sensor assembly.
9. The needle hub of claim 4 , wherein the at least one upper arm is flexible.
10. The needle hub of claim 8 , wherein the needle has a C-shaped, U-shaped, or V-shaped cross section.
11. The needle hub of claim 1 , wherein the needle hub is coupled to the insertion element by heat staking, snap-fit, friction-fit, clamshell, or insert molding.