It's part of equipment called a cannula used for carrying out medical procedures.
https://www.thefreedictionary.com/cannula

Kyphoplasty consists of injecting a balloon into the vertebrae with a cannula, then pushing a filler into the balloon (according to what I've seen online - I'm not a medical expert). That would tie in with the 3 cannula types used and therefore invoice for.

Dermal filler cannulas - Premium specialty needles - TSK ...https://www.tsklab.com › dermal-filler-cannulas
Dermal filler cannulas with blunt tips have been developed for use with HA and non HA dermal fillers. The length and flexibility allow aesthetic ...


Needles vs Cannulas in the aesthetic practice - DPI ...https://en.dpi-cosmetology.com › 2020/06/23 › needles...
23 Jun 2020 — There are several advantages to using blunt-tipped cannulas for facial augmentation in areas such as the tear trough, forehead, temples and ...


WO/2018/112690 ARTHROSCOPIC CANNULA - PatentScopehttps://patentscope.wipo.int › search › detail
28 Jun 2018 — The arthroscopic cannula comprises: a cannula body (1); a spacer (2), wherein the spacer (2) is provided inside the cannula body (1), ...

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Note added at 5 hrs (2021-09-01 11:32:10 GMT)
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Balloon Kyphoplasty for Acute T8 Compression Fracturehttps://www.spineuniverse.com › ... › Case Study Library
An 11G cannula was selected as the smallest cannula for kyphoplasty. Placement of the cannula into the posterior one-third of the T8 vertebral body ...

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Note added at 7 hrs (2021-09-01 14:09:25 GMT)
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Cannula Core Knowledge (Online) - DH Traininghttps://www.dhaesthetictraining.org › clinical-courses
I have limited/no experience in using blunt cannulas for dermal fillers, am I still eligible for this course? All aesthetic medical practitioners who are ...