Method and system for tissue treatment with critical/supercritical carbon dioxide

Patent metadata

Field	Value
Publication number	US-2018044639-A1
Application number	US-201615235202-A
Country	US
Kind code	A1
Filing date	Aug 12, 2016
Priority date	Aug 12, 2016
Publication date	Feb 15, 2018
Grant date	—

Abstract

Methods of decontaminating bone tissue and an apparatus or system for the same are provided. The methods can be multi-batch processes and include contacting the bone tissue having contaminants with carbon dioxide to decontaminate the bone tissue and to form carbon dioxide having contaminants. The contaminated carbon dioxide is collected and the contaminants are removed to obtain purified carbon dioxide which can be recycled to treat contaminated bone tissue. The contaminated carbon dioxide can be purified by bubbling it through water and/or an organic solvent followed by acid treatment, filtering and liquefying the carbon dioxide. Contaminants that can be removed from contaminated bone tissue, and in turn, from contaminated carbon dioxide include infectious organisms, bacteria, viruses, protozoa, parasites, fungi and mold or a mixture thereof.

First claim

What is claimed is:

1 . A method of decontaminating bone tissue, the method comprising:
contacting the bone tissue having contaminants therein with carbon dioxide to decontaminate the bone tissue and form carbon dioxide having contaminants; collecting the carbon dioxide having contaminants; and separating the contaminants from the collected carbon dioxide.

2 . A method of decontaminating bone tissue of claim 1 , comprising treating the contaminated bone tissue with ethanol gradient dehydration.

3 . A method of decontaminating bone tissue of claim 2 , further comprising flushing with liquid carbon dioxide the contaminated bone tissue treated with ethanol gradient dehydration.

4 . A method of decontaminating bone tissue of claim 3 , further comprising subjecting the contaminated bone tissue to critical point dehydration and/or supercritical carbon dioxide treatment; and releasing the carbon dioxide at a controlled rate.

5 . A method of decontaminating bone tissue of claim 4 , wherein the temperature and pressure of carbon dioxide is raised to or above 31.1° C. and 1100 psi.

6 . A method of decontaminating bone tissue of claim 4 , wherein supercritical carbon dioxide treatment is carried out at approximately 105° C. and approximately 7000 psi.

7 . A method of decontaminating bone tissue of claim 1 , further comprising removing the contaminated carbon dioxide, purifying the contaminated carbon dioxide with supercritical fluid, liquefying the purified carbon dioxide and using liquid purified carbon dioxide as a cooling fluid.

8 . A method of decontaminating bone tissue of claim 1 , wherein contaminated carbon dioxide is separated by bubbling through water and/or an organic solvent to remove contaminants comprising lipids, disease causing pathogens, viruses or bacteria.

9 . A method of decontaminating bone tissue of claim 8 , further comprising treating the carbon dioxide bubbled through water and/or the organic solvent with acid treatment, filtering and liquefying the carbon dioxide.

10 . A method of decontaminating bone tissue of claim 9 , wherein the liquefied carbon dioxide is purified to 99.9% free of lipids, disease causing pathogens, viruses or bacteria.

11 . A method of decontaminating bone tissue of claim 9 , further comprising generating processing charts including vanishing interfacial tension and carbon dioxide pressure.

12 . A method of decontaminating bone tissue of claim 1 , wherein the bone tissue comprises bone fibers, bone chips, bone particles, bone matrices or mixtures thereof.

13 . A method of decontaminating bone tissue of claim 1 , further comprising providing a delivery vehicle for the bone tissue having contaminants, the delivery vehicle comprising a carrier or covering.

14 . A method of decontaminating bone tissue of claim 1 , wherein the method of decontaminating the bone tissue is a multiple batch process.

15 . A method for purifying contaminated carbon dioxide from contaminated bone tissue, the method comprising:
collecting contaminated carbon dioxide from carbon dioxide treated contaminated bone tissue; separating contaminants from the collected contaminated carbon dioxide to obtain purified carbon dioxide.

16 . A method for purifying carbon dioxide from contaminated bone tissue of claim 15 , wherein the contaminated carbon dioxide is separated from the contaminants by bubbling the contaminated carbon dioxide through water and/or an organic solvent to remove the contaminants comprising lipids, disease causing pathogens, viruses or bacteria.

17 . A method for purifying carbon dioxide from contaminated bone tissue of claim 16 , further comprising treating the carbon dioxide bubbled through water and/or the organic solvent with acid treatment, filtering and liquefying the carbon dioxide.

18 . A method for purifying carbon dioxide from contaminated bone tissue of claim 17 , wherein the liquefied carbon dioxide is purified to 99.9% free of lipids, disease causing pathogens, viruses or bacteria.

19 . A system for treating contaminated bone tissue with purified carbon dioxide, the system comprising a bone tissue chamber configured for holding contaminated bone tissue and receiving purified carbon dioxide into the bone tissue chamber and evacuating contaminated carbon dioxide from the bone tissue chamber; a purified carbon dioxide supply configured for supplying purified carbon dioxide to the bone tissue chamber to decontaminate the bone tissue; a collection chamber configured to receive contaminated carbon dioxide from the bone tissue chamber and evacuate contaminated carbon dioxide from the collection chamber; and a purification chamber configured to receive contaminated carbon dioxide from the collection chamber and to remove contaminants from the contaminated carbon dioxide by a purification material to obtain purified carbon dioxide, the purification chamber configured to evacuate the purified carbon dioxide and supply it to the bone tissue chamber.

20 . A system for treating contaminated bone tissue with purified carbon dioxide of claim 19 , further comprising a controller and a signal transmission system functionally interconnecting the controller with the bone tissue chamber, the purified carbon dioxide supply, the collection chamber and the purification chamber, the controller comprising computer readable instructions to cause the controller to effect the evacuation of contaminated carbon dioxide from the bone tissue chamber to the collection chamber, send the contaminated carbon dioxide to the purification chamber, and to dispense the purified carbon dioxide to the bone tissue chamber.

Assignees

• Warsaw Orthopedic Inc

Inventors

• Decaro Mark
• Wei Guobao

Classifications

• A61L2103/00

  Materials or objects being the target of disinfection or sterilisation · CPC title

• A61L2/16

  using chemical substances · CPC title

• A61L2103/05

  Living organisms or biological materials · CPC title

• A61L2202/14

  Means for controlling sterilisation processes, data processing, presentation and storage means, e.g. sensors, controllers, programs · CPC title

• B01D11/0284

  Multistage extraction · CPC title