Measuring Tissue Back-Pressure - In Vivo Injection Forces During Subcutaneous Injection

Allmendinger, Andrea and Mueller, Robert and Schwarb, Edward and Chipperfield, Mark and Huwyler, Jörg and Mahler, Hanns-Christian and Fischer, Stefan. (2015) Measuring Tissue Back-Pressure - In Vivo Injection Forces During Subcutaneous Injection. Pharmaceutical research, 32 (7). pp. 2229-2240.

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Official URL: http://edoc.unibas.ch/42901/

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Limited information is available on injection forces of parenterals representing the in vivo situation. Scope of the present study was to investigate the contribution of the subcutaneous (sc) tissue layer to injection forces during in vivo injection.
Göttingen minipigs received injections of isotonic dextran solutions (1-100 mPas) into the plica inguinalis using different injection rates and volumes (0.025-0.2 mL/s and 2.5 vs. 4.5 mL).
The contribution of the sc back-pressure to injection forces was found to increase linearly with viscosity and injection rate ranging from 0.6 ± 0.5 N to 1.0 ± 0.4 N (1 mPas), 0.7 ± 0.2 N to 2.4 ± 1.9 N (10 mPas), and 1.8 ± 0.6 N to 4.7 ± 3.3 N (20 mPas) for injection rates of 0.025 to 0.2 mL/s, respectively. Variability increased with viscosity and injection rate. Values are average values from 10 randomized injections. A maximum of 12.9 N was reached for 20 mPas at 0.2 mL/s; 6.9 ± 0.3 N was determined for 100 mPas at 0.025 mL/s. No difference was found between injection volumes of 2.5 and 4.5 mL. The contribution of the tissue was differentiated from the contribution of the injection device and a local temperature effect. This effect was leading to warming of the (equilibrated) sample in the needle, therefore smaller injection forces than expected compensating tissue resistance to some parts.
When estimating injection forces representative for the in vivo situation, the contribution of the tissue has to be considered as well as local warming of the sample in the needle during injection.
Faculties and Departments:05 Faculty of Science > Departement Pharmazeutische Wissenschaften > Pharmazie > Pharmazeutische Technologie (Huwyler)
UniBasel Contributors:Huwyler, Jörg
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Plenum Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:29 Nov 2016 09:43
Deposited On:29 Nov 2016 09:43

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