Liposomes as contrast agents for ultrasonic imaging and apparatus and methods for preparing the same
First Claim
Patent Images
1. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
- (a) placing a liquid media containing liposomes in a vessel,(b) pressurizing said vessel with a cooled gas, thereby dissolving a first portion of said gas into said liquid media, so that a portion of said dissolved gas enters said liposomes, and(c) rapidly depressurizing said vessel by releasing a second portion of said gas from said vessel, thereby causing said dissolved gas having entered said liposomes to form bubbles within said liposomes,and further comprising the step of sizing said liposomes.
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Abstract
Liposomes suitable as ultrasound contrast agents which contain media of various types including gases, gaseous precursors activated by pH, temperature or pressure, as well as other solid or liquid contrast enhancing agents, are described. Methods of using the same as ultrasound contrast agents are also disclosed. The present invention also comprises novel methods for synthesizing liposomes having encapsulated therein gases.
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Citations
86 Claims
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1. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel, (b) pressurizing said vessel with a cooled gas, thereby dissolving a first portion of said gas into said liquid media, so that a portion of said dissolved gas enters said liposomes, and (c) rapidly depressurizing said vessel by releasing a second portion of said gas from said vessel, thereby causing said dissolved gas having entered said liposomes to form bubbles within said liposomes, and further comprising the step of sizing said liposomes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 17, 18, 19, 20, 21, 22, 23, 24, 53, 54)
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8. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel, (b pressurizing said vessel with a gas, (c bubbling said gas through said liquid media, thereby dissolving a portion of said gas in said liquid media, so that a portion of said dissolved gas enters said liposomes, and (d) depressurizing said vessel, and further comprising the step of sizing said liposomes. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 35, 36, 37, 38, 39, 40, 41, 42, 55, 56)
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25. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) flowing a liquid media containing liposomes through a filter, (b) placing said liquid media containing liposomes in a vessel, (c) pressurizing said vessel with a cooled gas, thereby dissolving a first portion of said gas into said liquid media, so that a portion of said dissolved gas enters said liposomes, and (d) rapidly depressurizing said vessel by releasing a second portion of said gas from said vessel, thereby causing said dissolved gas having entered said liposomes to form bubbles within said liposomes. - View Dependent Claims (57, 58, 59)
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26. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel, (b) pressurizing said vessel with a cooled gas, thereby dissolving a first portion of said gas into said liquid media, so that a portion of said dissolved gas enters said liposomes, and (c) rapidly depressurizing said vessel by releasing a second portion of said gas from said vessel, thereby causing said dissolved gas having entered said liposomes to form bubbles within said liposomes, wherein said liquid media contains non-liposomal solids, and further comprising the step of removing said non-liposomal solids from said liquid media. - View Dependent Claims (27, 28, 60, 61, 62)
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29. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel by discharging said liquid media from a syringe, (b) pressurizing said vessel with a cooled gas, thereby dissolving a first portion of said gas into said liquid media, so that a portion of said dissolved gas enters said liposomes, and (c) rapidly depressurizing said vessel by releasing a second portion of said gas from said vessel, thereby causing said dissolved gas having entered said liposomes to form bubbles within said liposomes. - View Dependent Claims (63, 64, 65)
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30. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel, (b) pressurizing said vessel with a cooled gas, thereby dissolving a first portion of said gas into said liquid media, so that a portion of said dissolved gas enters said liposomes, (c) rapidly depressurizing said vessel by releasing a second portion of said gas from said vessel, thereby causing said dissolved gas having entered said liposomes to form bubbles within said liposomes, and (d) directing said bubble containing liposomes from said vessel into a syringe. - View Dependent Claims (66, 67, 68)
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31. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel, (b) pressurizing said vessel with a cooled gas, thereby dissolving a first portion of said gas into said liquid media, so that a portion of said dissolved gas enters said liposomes, (c) rapidly depressurizing said vessel by releasing a second portion of said gas from said vessel, thereby causing said dissolved gas having entered said liposomes to form bubbles within said liposomes and causing said dissolved gas in said liquid media external to said liposomes to form bubbles in said external media, and (d) decavitating said liquid media containing liposomes. - View Dependent Claims (32, 33, 34, 69, 70, 71)
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43. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) flowing a liquid media containing liposomes through a filter, (b) placing said liquid media containing liposomes in a vessel, (c) pressurizing said vessel with a gas, (d) bubbling said gas through said liquid media, thereby dissolving a portion of said gas in said liquid media, so that a portion of said dissolved gas enters said liposomes, and (e) depressurizing said vessel. - View Dependent Claims (72, 73, 74)
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44. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel, (b) pressurizing said vessel with a gas, (c) bubbling said gas through said liquid media, thereby dissolving a portion of said gas in said liquid media, so that a portion of said dissolved gas enters said liposomes, and (d) depressurizing said vessel, wherein said liquid media contains non-liposomal solids, and further comprising the step of removing said non-liposomal solids from said liquid media. - View Dependent Claims (45, 46, 75, 76, 77)
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47. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel by discharging said liquid media from a syringe, (b) pressurizing said vessel with a gas, (c) bubbling said gas through said liquid media, thereby dissolving a portion of said gas in said liquid media, so that a portion of said dissolved gas enters said liposomes, and (d) depressurizing said vessel. - View Dependent Claims (78, 79, 80)
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48. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel, (b) pressurizing said vessel with a gas, (c) bubbling said gas through said liquid media, thereby dissolving a portion of said gas in said liquid media, so that a portion of said dissolved gas enters said liposomes, (d) depressurizing said vessel, and (e) directing said liposomes in which said dissolved gas has entered from said vessel into a syringe. - View Dependent Claims (81, 82, 83)
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49. A method of synthesizing a liposome having encapsulated therein a gas comprising the steps of:
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(a) placing a liquid media containing liposomes in a vessel, (b) pressurizing said vessel with a gas, (c) bubbling said gas through said liquid media, thereby dissolving a portion of said gas in said liquid media, so that a portion of said dissolved gas enters said liposomes, (d) depressurizing said vessel, and (e) decavitating said liquid media containing liposomes. - View Dependent Claims (50, 51, 52, 84, 85, 86)
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Specification