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Devices

Syringes, needles, pens and the cold chain — the hardware questions.

48 topics2,155 posts14 solved Moderators: hana.sato, KLindqvist About this category

Syringes & needles 18 Pens & autoinjectors 18 Cold chain 12

48 topics

Topic	Participants	Replies	Views	Activity
Domestic fridge temperature mapping: a cheap experiment — what changed since Devices › Cold chain cold chain storage freeze-thaw temperature excursion Domestic fridge temperature mapping: a cheap experiment — what changed since — setting out what I have, and where I think it stops being reliable. What changes if the standard account of Domestic fridge…	+145	155	46k	12mo
Temperature loggers worth the money — the long version Devices › Cold chain storage freeze-thaw temperature excursion Closed On the subject in the title: Temperature loggers worth the money — the long version Working notes rather than a conclusion. A narrow question about Temperature loggers worth the money, deliberately narrow,…	+110	127	48k	6mo
A ten-fold dose error caught before injection — one year on Devices › Syringes & needles dead volume needle gauge & length subcutaneous injection syringe units On the subject in the title: A ten-fold dose error caught before injection — one year on Working notes rather than a conclusion. Two things I would like separated before anyone answers on ten-fold dose error…	+151	157	9.4k	12mo
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Devices › Syringes & needles dead volume needle gauge & length subcutaneous injection Solved On the subject in the title: 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Working notes rather than a conclusion. A follow-up question about 0.3 ml versus 0.5 ml that I did not know to ask the…	+108	124	27k	2mo
Fixed versus detachable needles: the trade-offs Devices › Syringes & needles dead volume subcutaneous injection syringe units worked example Solved Posting this under the heading it deserves: Fixed versus detachable needles: the trade-offs Everything below is what sits behind that. I was wrong about fixed versus detachable needles in a thread last spring…	+117	121	7.3k	18mo
A ten-fold dose error caught before injection Devices › Syringes & needles needle gauge & length worked example syringe units dead volume Closed A ten-fold dose error caught before injection — setting out what I have, and where I think it stops being reliable. Trying to work out what would count as evidence on ten-fold dose error caught, before…	+95	103	26k	10mo
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Devices › Syringes & needles syringe units subcutaneous injection needle gauge & length dead volume Wiki 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters — setting out what I have, and where I think it stops being reliable. A follow-up question about 0.3 ml versus 0.5 ml that I did not know to ask…	+104	114	6k	6d
Pen dose counters: what a click does and does not guarantee Devices › Pens & autoinjectors missed dose subcutaneous injection storage Under review On the subject in the title: Pen dose counters: what a click does and does not guarantee Working notes rather than a conclusion. Pen dose counters — I have the observation and I do not trust my interpretation…	+116	122	1.6k	8mo
Follow-up: Dead volume across syringe and needle combinations Devices › Syringes & needles syringe units worked example subcutaneous injection dead volume Solved Dead volume across syringe and needle combinations — setting out what I have, and where I think it stops being reliable. A follow-up question about Dead volume across syringe that I did not know to ask the…	+81	98	22k	18mo
Dead volume across syringe and needle combinations Devices › Syringes & needles needle gauge & length subcutaneous injection dead volume syringe units On the subject in the title: Dead volume across syringe and needle combinations Working notes rather than a conclusion. Something about dead volume across syringe does not reconcile and I would like a second…	+72	80	28k	5mo
Second pass at: Pen dose counters: what a click does and does not guarantee Devices › Pens & autoinjectors dead volume storage subcutaneous injection Second pass at: Pen dose counters: what a click does and does not guarantee — setting out what I have, and where I think it stops being reliable. Two things I would like separated before anyone answers on Pen…	+63	68	51k	13mo
Airline travel with a temperature-sensitive injectable — what changed since Devices › Cold chain cold chain storage temperature excursion Airline travel with a temperature-sensitive injectable — what changed since Writing it up because I had to work it out twice and would rather nobody else did. What changes if the standard account of Airline…	+89	95	5.3k	9mo
Travel coolers and how long they really hold Devices › Cold chain temperature excursion storage freeze-thaw On the subject in the title: Travel coolers and how long they really hold Working notes rather than a conclusion. A narrow question about travel coolers, deliberately narrow, because the broad version has…	+78	84	14k	12mo
Pen mechanics when the cartridge is nearly empty — does this still hold? Devices › Pens & autoinjectors storage subcutaneous injection missed dose dead volume Asking directly, because I could not find a straight answer: Pen mechanics when the cartridge is nearly empty — does this still hold? Pen mechanics — I have the observation and I do not trust my…	+37	47	61k	6mo
Temperature loggers worth the money Devices › Cold chain cold chain storage freeze-thaw Temperature loggers worth the money — setting out what I have, and where I think it stops being reliable. Something about temperature loggers worth the money does not reconcile and I would like a second pair…	+46	50	8k	9mo
Filter needles: when they help and what they cost you Devices › Syringes & needles needle gauge & length subcutaneous injection dead volume On the subject in the title: Filter needles: when they help and what they cost you Working notes rather than a conclusion. Trying to work out what would count as evidence on filter needles, before collecting…	+45	50	19k	5mo
Travel coolers and how long they really hold — the long version Devices › Cold chain storage freeze-thaw cold chain Solved Pinned Travel coolers and how long they really hold — the long version — setting out what I have, and where I think it stops being reliable. A narrow question about Travel coolers, deliberately narrow, because the…	+19	23	45k	14mo
Gauge and length selection for subcutaneous injection Devices › Syringes & needles syringe units needle gauge & length worked example subcutaneous injection Solved Gauge and length selection for subcutaneous injection Writing it up because I had to work it out twice and would rather nobody else did. A follow-up question about gauge and length selection that I did not…	+50	55	1.3k	8mo
Second pass at: Gauge and length selection for subcutaneous injection Devices › Syringes & needles subcutaneous injection syringe units worked example needle gauge & length Posting this under the heading it deserves: Second pass at: Gauge and length selection for subcutaneous injection Everything below is what sits behind that. The question about Gauge and length selection that…	+50	58	14k	15mo
A fridge failure and how I assessed the contents afterwards Devices › Cold chain cold chain storage temperature excursion A fridge failure and how I assessed the contents afterwards Writing it up because I had to work it out twice and would rather nobody else did. The question about fridge failure that I actually want answered…	+14	18	46k	17h
Revisiting: Filter needles: when they help and what they cost you Devices › Syringes & needles worked example needle gauge & length subcutaneous injection dead volume Closed Revisiting: Filter needles: when they help and what they cost you — setting out what I have, and where I think it stops being reliable. Trying to work out what would count as evidence on Filter needles,…	+48	52	6.6k	11mo
Fixed versus detachable needles: the trade-offs — does this still hold? Devices › Syringes & needles syringe units needle gauge & length dead volume subcutaneous injection Solved Fixed versus detachable needles: the trade-offs — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below. Working notes on Fixed versus detachable…	+8	12	39k	15h
Needle changes between doses on a reusable pen Devices › Pens & autoinjectors subcutaneous injection dead volume missed dose storage Posting this under the heading it deserves: Needle changes between doses on a reusable pen Everything below is what sits behind that. The question about needle changes between doses that I actually want…	+34	38	1.5k	10mo
A pen that felt like it delivered nothing: diagnosing it afterwards Devices › Pens & autoinjectors storage subcutaneous injection missed dose dead volume Solved On the subject in the title: A pen that felt like it delivered nothing: diagnosing it afterwards Working notes rather than a conclusion. Question about a metering device rather than about a syringe, because…	+35	39	584	6mo
Reading U-100 graduations, with a conversion table Devices › Syringes & needles dead volume worked example subcutaneous injection needle gauge & length Posting this under the heading it deserves: Reading U-100 graduations, with a conversion table Everything below is what sits behind that. A question about reading U-100 graduations that I think has a definite…	+35	41	2k	1d
About the Syringes & needles category Devices › Syringes & needles syringe units dead volume needle gauge & length Pinned Wiki Insulin syringe graduations, dead volume, gauge and length selection, and reading units correctly. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded…		4	45k	1mo
Needle changes between doses on a reusable pen — does this still hold? Devices › Pens & autoinjectors dead volume missed dose storage Solved Wiki Needle changes between doses on a reusable pen — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below. Posting a small dataset on Needle changes…	+1	5	38k	13mo
Why a pen's dose steps are fixed and what that costs you — one year on Devices › Pens & autoinjectors storage subcutaneous injection missed dose Solved Closed Asking directly, because I could not find a straight answer: Why a pen's dose steps are fixed and what that costs you — one year on Question about a metering device rather than about a syringe, because the…	+30	34	2.9k	11mo
Priming a pen and whether the primed volume is wasted Devices › Pens & autoinjectors storage missed dose dead volume Solved Wiki Priming a pen and whether the primed volume is wasted Writing it up because I had to work it out twice and would rather nobody else did. I have spent a fortnight trying to pin priming a pen down and I want to…	+19	23	1.3k	2d
Reading a syringe in poor light, and how to avoid needing to — what changed since Devices › Syringes & needles dead volume subcutaneous injection syringe units needle gauge & length Posting this under the heading it deserves: Reading a syringe in poor light, and how to avoid needing to — what changed since Everything below is what sits behind that. What changes if the standard account of…	+3	7	27k	27d

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