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<b>Design 2 (Test tube)</b><br> | <b>Design 2 (Test tube)</b><br> | ||
We then designed another prototype. The freeze-dried cell-free pellet is condensed on the bottom of the test tube. There is a water pack on the top (below the cap), and a ring of saw-tooth down below the water pack. When the user presses the cap, the water pack will burst because of the pressure exerted from both cap and saw-tooth, hydrating the freeze-dried cell-free pellet. Also, in order to reduce the effect, brought by light on the cell-free system, there is an opaque membrane outside the tube. Users can tear along the dotted line before use. There is a circle in the middle of the plane of saw-tooth and its size is able to allow the passage of a cotton wool used for sample collection, including nasal swab. | We then designed another prototype. The freeze-dried cell-free pellet is condensed on the bottom of the test tube. There is a water pack on the top (below the cap), and a ring of saw-tooth down below the water pack. When the user presses the cap, the water pack will burst because of the pressure exerted from both cap and saw-tooth, hydrating the freeze-dried cell-free pellet. Also, in order to reduce the effect, brought by light on the cell-free system, there is an opaque membrane outside the tube. Users can tear along the dotted line before use. There is a circle in the middle of the plane of saw-tooth and its size is able to allow the passage of a cotton wool used for sample collection, including nasal swab. | ||
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However, this design is criticized by Prof Chan as the pellet may be not condensed at the bottom of test tube during freeze-drying by reasons of improper transportation, etc. In view of this, we try to condense the cell-free solution at the bottom, for example, use a smaller tube rather than the 15ml tube so that it is easier to make the pellet condensed at the bottom. Also, the cell-free system will be freeze-dried and stored in the test tube prior to distribution to market. Thus, during shipping, low-temperature environment maintenance should be ensured, preventing them from melting and not dispersed around. | However, this design is criticized by Prof Chan as the pellet may be not condensed at the bottom of test tube during freeze-drying by reasons of improper transportation, etc. In view of this, we try to condense the cell-free solution at the bottom, for example, use a smaller tube rather than the 15ml tube so that it is easier to make the pellet condensed at the bottom. Also, the cell-free system will be freeze-dried and stored in the test tube prior to distribution to market. Thus, during shipping, low-temperature environment maintenance should be ensured, preventing them from melting and not dispersed around. |
Revision as of 08:00, 30 October 2017