Thermal bath systems and thermally-conductive particulate thermal bath media and methods

Abstract

Thermally-conductive laboratory bath media can be used to replace conventional wet media or dry solid blocks in existing thermal baths for heating or cooling samples with advantageous maintenance and microbial control benefits. The media is typically in the form of metallic or metallic-coated pellets that have rounded edges, hardened surface, a smooth polished finish, and are sized small for efficient thermal communication between pellets and samples. Laboratory bath improvements are disclosed with various advanced controls and adaptations for thermal control as well as infection control.

Description

CROSS REFERENCES TO RELATED APPLICATION[0001]The present application claims the benefit of prior filed U.S. Provisional Application Ser. No. 61 / 068,505, filed Mar. 7, 2008. By this reference, the full disclosure, including the claims and drawings, of U.S. provisional application Ser. No. 61 / 068,505 is incorporated herein as though now set forth in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to thermal instrument baths. More particularly, it especially relates to laboratory thermal baths and media for use therein to provide instrument maintenance and microbial contamination control benefits.[0004]2. Related Art[0005]Laboratory thermal baths such as water baths and dry blocks are well-established laboratory instruments for heating or cooling objects, vessels, or samples contained therein. Laboratory thermal baths comprise a thermal source, a temperature control unit, power source, insulation, and a tub to contain wet or dr...

AI Technical Summary

Benefits of technology

[0009]The present invention provides thermal bath media capable of maintaining a relatively constant temperature, having optimal shape and size, and maintenance and contamination control benefits. Central to many aspects of the present invention is thermally-conductive particulate media distinguished from conventional thermal bath media. Some of the most favorable qualities of the thermally-conductive particulate media is appreciated with media in the form of smooth, oblong pellets having their widest dimension between two and thirty millimeters, wherein said materials are capable of providing thermal transfer when used in standard laboratory thermal bath. In particular, the thermally-conductive pellets are non-granular and not jagged so as not to pierce or puncture objects inserted into them, and are moisture and gas impermeable to prevent the harboring of contaminants, and are sufficiently smooth, stiff and incompressible, and in some instances are sufficiently elliptical but noncircular in at least one cross-section to permit easy insertion of vessels to promote efficient thermal transfer. The media may comprise pellets having a mixture of uniform or non-uniform shapes and sizes.

[0011]The materials of the thermally-conductive pellets are dry and naturally more resistant to microbial growth and than water and therefore less likely to harbor and contribute to transmitting microorganisms in the laboratory. Microbial growth can be further diminished by autoclaving or by routinely applying antimicrobial agents such as fungicides, algaecides virucides, and bactericides to the thermally-conductive pellets. Such antimicrobial agents can be permanently incorporated into the thermally-conductive pellets or otherwise onto the thermally-conductive pellets as a coating. Such coatings can prevent hazardous biofilm formation and produce a microbial contamination barrier. Examples of antimicrobial coatings include solutions comprised of ionic silver, ionic copper, or any permanent or semi-permanent disinfectant.

[0012]A further advantage of the thermally-conductive pellets hereof over conventional dry thermal bath media comprised of drilled out aluminum blocks is the ability of the pellets to conform to varied sizes and shapes of vessels placed in the laboratory thermal tub. The thermally-conductive pellets fill around the vessel providing sufficient thermal communication between the pellets and the vessel, thereby allowing the vessel and its contained specimen to reach the intended temperature.

Problems solved by technology

One drawback to the present thermal bath media is that laboratory thermal baths are generally set at temperatures ideal for biological activity, and therefore can promote the growth of invading microorganisms on or within the media, including bacteria, yeast, fungi, and virus.

This can place laboratory personnel at risk, compromise laboratory supplies and equipment, jeopardize sterile operations, and require substantial routine instrument cleaning and maintenance.

However, these agents are impermanent, and without rigorous maintenance and regular renewal, they become less effective.

Such biofilms comprised of Escherichia coli, staphylococcus, or other microorganisms responsible for difficult-to-treat infections in humans, pose a significant risk to personnel and patients in laboratories and healthcare facilities.

Furthermore, objects or capped or uncapped vessels containing samples that are placed into the water of the laboratory thermal bath are prone to tipping over and floating.

Such events can lead to the contamination or destruction of costly samples or sample contamination of the thermal bath and the laboratory.

Moreover, thermal baths require frequent water replenishment and routine cleaning and maintenance, which can be time-consuming and costly.

In particular, solid aluminum block systems limit the vessels that can be used to the size and shape of the drilled-out receptacles in their bodies.

Laboratory vessels due to their unique size or shape usually necessitate the purchase of numerous aluminum blocks or the costly production of custom aluminum block systems.

The characteristics of particulate matter impact the raw material cost as well as the cost and ease of using, handling, and processing the particulate matter for any particular application.

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