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. An applicator for applying an on-skin sensor assembly to a skin of a host, the applicator comprising:
an on-skin sensor assembly;
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;
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;
a sensor retention sleeve disposed around at least a portion of the insertion element and the sensor and configured to decouple from the insertion element and the sensor when the insertion element and the sensor are inserted into the skin of the host; and
a sensor retention element disposed against at least one of the insertion element and the sensor in a first position and configured to rotate away from the insertion element and the sensor in a second position,
wherein the sensor retention sleeve is configured to retain the sensor within the insertion element before the sensor is inserted into the skin of the host.
2. The applicator of claim 1 , wherein the on-skin sensor assembly comprises an electronics unit.
3. The applicator of claim 2 , wherein the sensor is connected to the electronics unit in the applicator housing.
4. The applicator of claim 1 , further comprising an elastomeric sensor retention element coupled to the applicator housing at a first end and coupled to at least one of the insertion element and the sensor, the elastomeric sensor retention element configured to retain the sensor within the insertion element prior to activation of the drive assembly.
5. The applicator of claim 4 , wherein, upon activation, the insertion element is configured to progress in the proximal direction such that the elastomeric sensor retention element decouples from the at least one of the insertion element and the sensor.
6. The applicator of claim 1 , further comprising a sensor retention element comprising a tab configured to retain the sensor within the insertion element prior to activation of the drive assembly.
7. The applicator of claim 1 , wherein the sensor comprises a strain relief feature configured to limit the sensor from bending at a bend radius smaller than a predetermined bend radius.
8. The applicator of claim 1 , wherein the needle carrier assembly comprises a tapered needle hub configured to split the sensor retention sleeve during insertion of the sensor.
9. An applicator for applying an on-skin sensor assembly to a skin of a host, the applicator comprising:
an on-skin sensor assembly;
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, wherein the sensor comprises a strain relief feature configured to limit the sensor from bending at a bend radius smaller than a predetermined bend radius;
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.
10. The applicator of claim 9 , wherein the strain relief feature comprises an elastomeric material.
11. The applicator of claim 9 , wherein the on-skin sensor assembly comprises an electronics unit.
12. The applicator of claim 11 , wherein the sensor is connected to the electronics unit in the applicator housing.
13. The applicator of claim 9 , further comprising an elastomeric sensor retention element coupled to the applicator housing at a first end and coupled to at least one of the insertion element and the sensor, the elastomeric sensor retention element configured to retain the sensor within the insertion element prior to activation of the drive assembly.
14. The applicator of claim 13 , wherein, upon activation, the insertion element is configured to progress in the proximal direction such that the elastomeric sensor retention element decouples from the at least one of the insertion element and the sensor.
15. The applicator of claim 9 , further comprising a sensor retention element comprising a tab configured to retain the sensor within the insertion element prior to activation of the drive assembly.
16. The applicator of claim 9 , further comprising a sensor retention element disposed against at least one of the insertion element and the sensor in a first position and configured to rotate away from the insertion element and the sensor in a second position.
17. The applicator of claim 9 , further comprising a sensor retention sleeve disposed around at least a portion of the insertion element and the sensor, wherein the needle carrier assembly comprises a tapered needle hub configured to split the sensor retention sleeve during insertion of the sensor.