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A cooling device and methods of using the cooling device are described. The cooling device includes a flexible, elongated body member having a first end portion and a second end portion, or is adjustable with the first end portion and the second end portion attached, the elongated body member formin

A cooling device and methods of using the cooling device are described. The cooling device includes a flexible, elongated body member having a first end portion and a second end portion, or is adjustable with the first end portion and the second end portion attached, the elongated body member forming an elongated cavity extending substantially between the first end portion and the second end portion, the cavity having a first substance disposed within the cavity. The cooling device further includes at least one rupturable compartment contained within the cavity, the compartment having a second substance disposed within the compartment. The cooling device also includes fastening means disposed on at least one of the first end portion and the second end portion for detachably fastening the first end portion to the second end portion to secure the cooling device around a circumference of a body part.

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1. A cooling device, comprising: a flexible, elongated body member having a first end portion and a second end portion, the elongated body member forming an elongated cavity extending substantially between the first end portion and the second end portion, the cavity having a first substance disposed

1. A cooling device, comprising: a flexible, elongated body member having a first end portion and a second end portion, the elongated body member forming an elongated cavity extending substantially between the first end portion and the second end portion, the cavity having a first substance disposed within the cavity;at least one rupturable compartment contained within the cavity, the compartment having a second substance disposed within the compartment; andfastening means disposed on at least one of the first end portion and the second end portion for detachably fastening the first end portion to the second end portion to secure the cooling device around a circumference of a body part, or adjustably attached to secure the cooling device around a circumference of a body part, or disposed within an external accessory device that holds the cooling device and can be fastened around a circumference of a body part, wherein the first substance is ammonium nitrate or urea and the second substance is water. 2. A cooling device, comprising: a flexible, elongated body member having a first end portion and a second end portion, the elongated body member forming an elongated cavity extending substantially between the first end portion and the second end portion, the cavity having a first substance disposed within the cavity;at least one rupturable compartment contained within the cavity, the compartment having a second substance disposed within the compartment; andfastening means disposed on at least one of the first end portion and the second end portion for detachably fastening the first end portion to the second end portion to secure the cooling device around a circumference of a body part, or adjustably attached to secure the cooling device around a circumference of a body part, or disposed within an external accessory device that holds the cooling device and can be fastened around a circumference of a body part, wherein the first substance is water and the second substance is ammonium nitrate or urea. 3. A method of cooling a body part, comprising: placing a cooling device around a circumference of the body part, wherein the cooling device comprises:a flexible, elongated body member having a first end portion and a second end portion, or having an adjustable elastic looped body, the elongated body member forming an elongated cavity extending substantially between the first end portion and the second end portion, the cavity having a first substance disposed within the cavity;at least one rupturable compartment contained within the cavity, the compartment having a second substance disposed within the compartment; andfastening means disposed of at least one of the first end portion and the second end portion for detachably fastening the first end portion to the second end portion;fastening the first end portion of the cooling device to the second end portion of the cooling device, or looping the cooling device around a circumference of a body part using an adjustable elastic body; andrupturing the rupturable compartment to cause the first substance to mix with the second substance within the cavity,wherein mixing of the first substance and the second substance causes an endothermic reaction to occur. 4. The method of claim 3, wherein the rupturable compartment is ruptured before the cooling device is placed around the circumference of the body part. 5. The method of claim 3, wherein the rupturable compartment is ruptured after the cooling device is secured around the circumference of the body part. 6. The method of claim 3, wherein the fastening means is selected from the group consisting of: a hook and loop fastener, a snap fastener, a single-sided adhesive material, a double-sided adhesive material, and a tie wrap, a knot, adjustably fastened or inserted in an external accessory that is holding the cooling element onto the body. 7. The method of claim 3, wherein the first substance is ammonium nitrate or urea and the second substance is water. 8. The method of claim 3, wherein the first substance is water and the second substance is ammonium nitrate or urea. 9. The method of claim 3, wherein the body part is a neck. 10. The method of claim 3, wherein the body part is a wrist. 11. The method of claim 3, wherein the body part is a head. 12. A cooling device, comprising: a flexible, elongated body member having a first end portion and a second end portion (either with the ends adjustably attached or unattached), the elongated body member forming an elongated cavity extending substantially between the first end portion and the second end portion, the cavity having a first substance disposed within the cavity;at least one rupturable compartment contained within the cavity, the compartment having a second substance disposed within the compartment; andfastening means disposed on at least one of the first end portion and the second end portion for detachably fastening the first end portion to the second end portion to secure the cooling device around a circumference of a body part, or having the first end portion adjustably attached to the second end portion,wherein rupturing of the rupturable compartment causes the second substance to be ejected from the compartment and mix with the first substance within the cavity, andwherein mixing of the first substance and the second substance causes an endothermic reaction to occur. 13. The cooling device of claim 1, wherein rupturing of the rupturable compartment causes the first substance to mix with the second substance within the cavity, wherein mixing of the first substance and the second substance causes an endothermic reaction to occur, and wherein a temperature of the mixture of the first substance and the second substance is less than a temperature of the body part. 14. The cooling device of claim 1, wherein the fastening means is selected from the group consisting of: a hook and loop fastener, a snap fastener, a single-sided adhesive material, a double-sided adhesive material, a tie wrap, a knot, an adjustable elastic means, and an external accessory device that can be fastened to the user's body and holds the cooling device. 15. The cooling device of claim 1, wherein the elongated cavity is configured to wrap substantially around a person's neck, a person's head, or a person's wrist when the first end portion is fastened to the second end portion or adjustably attaches the first end and second end portion together. 16. The cooling device of claim 1, wherein the body member is comprised of a disposable material. 17. The cooling device of claim 2, wherein rupturing of the rupturable compartment causes the first substance to mix with the second substance within the cavity, wherein mixing of the first substance and the second substance causes an endothermic reaction to occur, and wherein a temperature of the mixture of the first substance and the second substance is less than a temperature of the body part. 18. The cooling device of claim 2, wherein the fastening means is selected from the group consisting of: a hook and loop fastener, a snap fastener, a single-sided adhesive material, a double-sided adhesive material, a tie wrap, a knot, an adjustable elastic means, and an external accessory device that can be fastened to the user's body and holds the cooling device. 19. The cooling device of claim 2, wherein the elongated cavity is configured to wrap substantially around a person's neck, a person's head, or a person's wrist when the first end portion is fastened to the second end portion or adjustably attaches the first end and second end portion together. 20. The cooling device of claim 2, wherein the body member is comprised of a disposable material. 21. The cooling device of claim 12, wherein the body member is comprised of a disposable material.