Lyophilizing and forming biologicals having a predetermined unit dosage

• US 4,521,975 A
• Filed: 07/30/1982
• Issued: 06/11/1985
• Est. Priority Date: 05/04/1981
• Status: Expired due to Term

• Current Assignee: Vital Signs Incorporated (Becton Dickinson & Co)
• Original Assignee: Vital Signs Colorado, Inc. (Becton Dickinson & Co)
• Inventors: Bailey, Donald L.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/403,309
• Time in Patent Office: 1,047 Days
• Field of Search: 536/21, 34/5
• US Class Current: 34/285
• CPC Class Codes: B01L 3/5085 for multiple samples, e.g. microtitration plates
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F26B 5/06 the process involving freezing
• CPC Class Codes: G01N 2035/00445 Other cooling arrangements

Abstract

A pledget of biological material of predetermined unit dosage is formed by a lyophilizing process. The lyophilizing process involves establishing a specific batch volume of sterile water, dissolving a preestablished amount of biological material in the batch volume of water, filling at least one container with a portion of the solution of water and dissolved material, and lyophilizing the solution in the container into the pledget. The amount of biological material to be dissolved in the water is established in relation to the volume and number of containers, the desired predetermined unit dosage of each pledget, and the desired number of pledgets to be formed at a time.

Claims

1. A process involving lyophilization of biological material for producing pledgets of biological material in predetermined unit dosages for providing at least one of said pledgets in a syringe, comprising the steps of:

providing a predetermined amount of liquid;

providing a predetermined amount of biological material;

providing a container including a top portion and having a plurality of wells formed in said container, each of said wells defining a volume for receiving a desired amount of biological material solution;

forming a desired solution of biological material to produce pledgets of predetermined unit dosages using the magnitude of the predetermined amount of the liquid, the volume of each of said wells, and the predetermined magnitude of the amount of biological material;

placing said biological material solution in said wells of said container;

positioning said container in a chamber;

lyophilizing said biological material solution in said wells using said chamber to produce pledgets, each of said pledgets having a predetermined dosage of biological material;

removing each container from said lyophilizing chamber;

exposing said pledgets of said biological material in said wells wherein said pledgets can be removed;

removing each of said pledgets having a predetermined dosage of biological material from said plurality of wells, wherein said pledgets are separated from any apparatus used with said lyophilizing step; and

placing at least one of said pledgets in a barrel of the syringe for use in preventing coagulation of blood.

2. A process, as claimed in claim 1, further including:

receiving blood into the syringe; and

using at least said one pledget having a predetermined dosage of biological material to prevent coagulation of the blood received in the syringe barrel.

3. A process, as claimed in claim 1, wherein:

the step of providing a container includes providing a container having an upper layer in which said wells are formed and a lower layer made of a material having greater conductivity than said upper layer.

4. A process, as claimed in claim 1, wherein:

the step of placing said biological material solution into said wells includes immersing said container into a reservoir containing said biological material solution.

5. A process, as claimed in claim 1, wherein:

the step of placing said biological material solution into said wells includes directly contacting said wells with said biological material solution.

6. A process involving lyophilization for producing at least one pledget of biological material having a predetermined unit dosage, said one pledget being adapted to be placed in a syringe, comprising the steps of:

establishing a desired volume of water;

weighing out an amount of biological material;

providing a tray having a plurality of wells formed therein, each of said wells defining a volume;

forming a biological material solution to provide predetermined unit dosages of biological material using the magnitude of the volume of the water, the magnitude of the volume of each of said wells, and the magnitude of the amount of the biological material;

transferring said biological material solution to said tray by placing a portion of said biological material solution in each of said wells;

positioning said tray in a chamber;

lyophilizing said biological material in each of said wells to form pledgets having predetermined unit dosages of said biological material, said lyophilizing steps including;

insulating said tray to establish a temperature gradient that is cooler at the bottom of said biological material solution in said wells of said tray than at the top of said biological material solution in said wells of said tray, and

stopping said insulating after said biological material solution has been frozen and prior to evacuating said chamber and heating said chamber;

removing said tray from said chamber after lyophilization;

exposing said pledgets having predetermined unit dosages of said biological material in said wells so that said pledgets can be removed; and

removing said pledgets from each of said plurality of wells.

7. A process, as claimed in claim 6, further including the step of:

providing a cover on said tray during said insulating step to prevent contamination of said biological material.