Disposable cold pack for blood specimen
AssigneeThe Kendall Company
InventorHarish A. Patel
Life of this patent
Estimating the term…
Abstract
A disposable cold pack for cooling and storing a sample of freshly drawn blood at 28.degree. to 40.degree. F. for 45 minutes has an outer flexible insulation layer and a pair of sealed flexible plastic envelopes. In one embodiment, the envelopes are arranged one within the other and the outer one secured to the insulation, the inner envelope being filled with water and frangible, the outer one containing ammonium nitrate in a ratio to water from 1.24:1 to 1.26:1 by weight, and a closure for securing the pack in folded position around the sample container. In another embodiment the envelopes are arranged side by side with a connecting passageway between them releasably sealed in closed condition.
Claims11
A disposable cold pack for cooling and storing a container filled with a sample of freshly drawn blood comprising
- a temperature regulation means which comprises the elements of a first sealed flexible envelope of plastic material,
- a supply of dry solid ammonium nitrate disposed within said first envelope,
- a second sealed and frangible envelope containing a supply of water disposed within said first envelope and arranged to be broken by pressure applied externally to said first envelope to release said supply of water into said supply of ammonium nitrate within said first sealed envelope to activate said cold pack,
- the weight ratio of ammonium nitrate to water being from 1.24:1 to 1.26:1, the total weight of ammonium nitrate and water being from 180 to 200 grams, the elements of said temperature regulating means cooperatively functioning, upon the breaking of said second envelope, to cool said sample to a temperature low enough to avoid composition changes therein, but high enough to avoid freezing thereof, for a period of at least 45 minutes.
- said cold pack being adapted to be folded around said sample container with the container in contact with said first envelope.
A disposable cold pack for cooling and storing a container filled with a sample of freshly drawn blood comprising
- A. a temperature regulation means which comprises the elements of a single sealed flexible outer envelope of plastic material,
- B. an outer insulating layer of flexible foam plastic material engaging the outer face of said outer envelope and secured thereto, said insulating layer extending fully across the face of said first envelope and substantially beyond at least one margin of said envelope to form a flexible flap,
- C. a supply of dry solid ammonium nitrate disposed within said outer envelope,
- D. an inner sealed and frangible envelope containing a supply of water disposed within said outer envelope and arranged to be broken by pressure applied externally to said outer envelope to release said supply of water into said supply of ammonium nitrate within said outer sealed envelope to activate said cold pack,
- the weight ratio of ammonium nitrate to water being from 1.24:1 to 1.26:1 and the total weight of ammonium nitrate and water being from 180 to 200 grams,
- a closure member secured to said insulation layer flap at the margin thereof remote from said outer envelope for releasably maintaining said cold pack in folded position with said insulation layer outermost extending completely around the outer circumference of said folded cold pack,
- said cold pack being adapted to be folded around said sample container with the container in contact with said outer envelope for the elements of said temperature regulation means cooperatively functioning to chill said blood sample rapidly and to maintain it at a temperature of 28.degree. to 40.degree. F. for at least 45 minutes after activation in room temperature surroundings.
A disposable cold pack for cooling and storing a container filled with a sample of freshly drawn blood comprising
- a first sealed flexible envelope of plastic material,
- an outer insulating layer of flexible foam plastic material engaging the outer face of said outer envelope and secured thereto, said insulating layer extending fully across the face of said first envelope,
- A. temperature regulation means comprising the elements of a supply of dry solid ammonium nitrate disposed within said first envelope,
- B. a second sealed flexible envelope of plastic material disposed outside of and adjacent the first,
- C. a supply of water disposed within said second envelope,
- the weight ratio of ammonium nitrate to water being from 1.24:1 to 1.26:1 and the total weight of ammonium nitrate and water being from 180 to 200 grams,
- D. means connecting said first and second envelopes to permit mixing of the contents of the two envelopes, said elements of said temperature regulation means cooperatively functioning, upon said mixing, to chill said sample to a temperature low enough to avoid composition changes therein, but high enough to avoid freezing thereof, for a period of at least 45 minutes, and
- means for releasably sealing said connecting means to maintain the contents of the two envelopes separate.
Dependencies are inferred from the claim text.