Self-contained biological indicator
A self-contained biological indicator (“SCBI”) is disclosed. The SCBI may include a first ampule and a second ampule. The first ampule may contain a first volume of a first growth medium, and the second ampule may contain a second volume of a second growth medium. The SCBI is configured such that the first ampule may be broken before the second ampule. The SCBI may be analyzed for changes in fluorescence of the first growth medium. Then, the SCBI may be analyzed for changes in a color of the second growth medium.
1. A self-contained biological indicator, comprising:
a first ampule having a first top and a first bottom, the first ampule containing a first volume of a first growth medium;
a second ampule having a second top and a second bottom, the second ampule containing a second volume of a second growth medium;
a cap,
a vial coupled to the cap and containing at least a portion of the first ampule and a portion of the second ampule, and
a counter cap disposed about the vial, the counter cap including a stop surface disposed between 0.1 inches and 1.5 inches below a rim of the cap,
wherein the cap is disposed above the first ampule and the second ampule, the first ampule is disposed adjacent to the second ampule, and the first top is disposed closer to the cap than the second top.
2. The self-contained biological indicator of claim 1 further comprising an insert, wherein at least a portion of the insert is disposed below the first ampule and the second ampule, and the first bottom and the second bottom contact the insert.
3. The self-contained biological indicator of claim 1 , wherein the first ampule is longer than the second ampule.
4. The self-contained biological indicator of claim 3 , wherein the first ampule is between 0.5 inches and 1.5 inches longer than the second ampule.
5. The self-contained biological indicator of claim 4 , wherein the first ampule is 1 inch longer than the second ampule.
6. The self-contained biological indicator of claim 2 , wherein the insert includes a first surface and a second surface further from the cap than the first surface, and wherein the first bottom contacts the first surface and the second bottom contacts the second surface.
7. The self-contained biological indicator of claim 6 , wherein the first surface is disposed between 0.1 inches to 1.5 inches above the second surface.
8. The self-contained biological indicator of claim 7 , wherein the first surface is disposed 0.8 inches above the second surface.
9. The self-contained biological indicator of claim 1 , wherein the first top contacts the cap.
10. The self-contained biological indicator of claim 1 , wherein the first growth medium is the same as the second growth medium.
11. The self-contained biological indicator of claim 10 , wherein the first growth medium and the second growth medium include 4-methylumbelliferyl α-D-glucoside (MUG).
12. The self-contained biological indicator of claim 1 , wherein the first volume is less than the second volume.
13. The self-contained biological indicator of claim 12 , wherein the first volume is between 50 μl and 150 μl and the second volume is greater than approximately 150 μl.
14. The self-contained biological indicator of claim 13 wherein the first volume is 100 μl and the second volume is 300 μl.
15. The self-contained biological indicator of claim 1 , wherein the vial and the cap are coupled by a tongue and a groove.
16. The self-contained biological indicator of claim 1 , wherein the stop surface is disposed 0.8 inches from the rim of the cap.