Method and apparatus for dispersion of microbes in a liquid suspension
An apparatus for dispersing microbes in a biological sample such as a liquid suspension sample and measuring turbidity of the liquid suspension is disclosed. The apparatus is configured for dispersing the microbes in a liquid suspension without destroying the integrity of the microbes and measure the turbidity of the sample suspension at the same time or in the same sample set up without having to move the microbe sample from one equipment to another.
1. An apparatus for dispersing microbes in a biological sample and measuring turbidity of the biological sample, the apparatus comprising:
a transparent container for holding a quantity of the biological sample in a sealed chamber, the container having a closed bottom end and an open top end, wherein the open top end is closable with a cap;
an ultrasonic transducer having a transducer head portion that generates ultrasonic vibrations;
a container-receiving guide block for holding the container in an operating configuration in which the container's bottom end and the transducer head are in direct contact, wherein the container-receiving guide block has a top end and a bottom end and a sidewall defining a longitudinally oriented bore extending from the top end to the bottom end of the container-receiving guide block for receiving the container, wherein the bottom end aligns the closed bottom end of the container with the transducer head;
a light source for shining light into the quantity of the biological sample for measuring the turbidity of the sample;
a lid assembly, movable between an open position and a closed position, that is configured and adapted for engaging the top end of the container and urging the container toward the transducer head when the container is being held by the container-receiving guide block and the lid assembly is in the closed position, so that the container bottom surface is in contact with the transducer head and the ultrasonic vibrations generated by the transducer head is transmitted through the container wall to the sample and disperse the microbes in the sample;
wherein the lid assembly is provided with a spring-loaded mechanism formed by a hub and a receptacle nested inside the hub for engaging the top end of the container and urge the container toward the transducer head, wherein the hub is affixed to the lid assembly and having an opening through which the receptacle is received within the hub and can slide up and down, wherein the receptacle having a cavity defined by its sidewalls for receiving the top end of the container, the hub and the receptacle forming a chamber between the sidewalls of the receptacle and the hub wherein a coil spring is captured inside the chamber and urges on the receptacle downward;
a photo diode for measuring the sample's turbidity by detecting the light scattered by the microbes in the sample; and
an opening provided on the sidewall of the container-receiving guide block, the opening providing a viewing access to the container for the photo diode for measuring the sample's turbidity.
2. The apparatus of claim 1 wherein the biological sample is a liquid suspension sample.
3. The apparatus of claim 1 , configured for measuring the sample's turbidity concurrently as the microbes in the sample is being dispersed.
4. The apparatus of claim 1 , wherein the transducer head is provided with a recess having a chamfered edge that makes a contact with the container's bottom end for efficient transfer of ultrasonic vibration from the transducer head to the container.
5. The apparatus of claim 4 , wherein the container has a cylindrical shape and the recess provided in the transducer head has a circular opening and the chamfered edge makes the contact with the container along an annular region for providing a close contact between the container bottom surface and the transducer head for efficient transfer of ultrasonic vibration from the transducer head to the container.
6. The apparatus of claim 1 , wherein the light source for the turbidity measurement is provided near the top end of the container-receiving guide block.
7. The apparatus of claim 6 , wherein the light source is provided with a hole for receiving the container therethrough, wherein the hole is aligned with the longitudinally oriented bore of the container-receiving guide block.
8. An apparatus for dispersing microbes in a biological sample and measuring turbidity of the biological sample, the apparatus comprising:
an ultrasonic transducer having a transducer head portion that generates ultrasonic vibrations;
a container-receiving guide block for holding a container of microbes in a biological sample in an operating configuration in which the container's bottom end and the transducer head come in direct contact, wherein the container-receiving guide block has a top end and a bottom end and a sidewall defining a longitudinally oriented bore extending from the top end to the bottom end of the container-receiving guide block for receiving the container, wherein the bottom end aligns the closed bottom end of the container with the transducer head, and wherein the container-receiving guide block provides a light source for measuring the turbidity of the biological sample;
a lid assembly, movable between an open position and a closed position, that is configured and adapted for engaging the container and urge the container toward the transducer head when the container is being held by the container-receiving guide block and the lid assembly is in the closed position, so that the container bottom surface is in direct contact with the transducer head and the ultrasonic vibrations generated by the transducer head is transmitted through the container's wall to the sample and disperse the microbes in the sample;
wherein the lid assembly is provided with a spring-loaded mechanism formed by a hub and a receptacle nested inside the hub for engaging the top end of the container and urge the container toward the transducer head, wherein the hub is affixed to the lid assembly and having an opening through which the receptacle is situated within the hub and can slide up and down, wherein the receptacle having a cavity defined by its sidewalls for receiving the top end of the container, the hub and the receptacle forming a chamber between the sidewalls of the receptacle and the hub wherein a coil spring is captured inside the chamber and urges on the receptacle downward;
a photo diode for measuring the sample's turbidity; and
an opening provided on the sidewall of the container-receiving guide block, the opening providing a viewing access to the container for the photo diode for measuring the sample's turbidity.
9. The apparatus of claim 8 wherein the biological sample is a liquid suspension sample.
10. The apparatus of claim 8 , configured for measuring the liquid suspension's turbidity concurrently as the microbes in the liquid suspension is being dispersed.
11. The apparatus of claim 8 , wherein the transducer head is provided with a recess having a chamfered edge that makes a contact with the container's bottom end for efficient transfer of ultrasonic vibration from the transducer head to the container.
12. The apparatus of claim 11 , wherein the container has a cylindrical shape and the recess provided in the transducer head has a circular opening and the chamfered edge makes the contact with the container along an annular region for providing a close contact between the container bottom surface and the transducer head for efficient transfer of ultrasonic vibration from the transducer head to the container.
13. The apparatus of claim 8 , wherein the light source for the turbidity measurement is provided near the top end of the container-receiving guide block.
14. The apparatus of claim 13 , wherein the light source is provided with a hole for receiving the container therethrough, wherein the hole is aligned with the longitudinally oriented bore of the container-receiving guide block.