# US 4,396,023 A · Apparatus for obtaining blood samples from animals such as mice or rats

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- Number: US 4,396,023 A
- Document ID: US4396023A
- Status: Granted
- Kind: A
- Application number: 06/304,217
- Filed: 1981-09-21
- Granted: 1983-08-02
- Earliest claimed: 1981-09-21
- Inventors: Porter W. Anderson
- Web page: https://patentgrep.com/patent/US4396023A

## CPC

- A61B 5/150351: {Caps, stoppers or lids for sealing or closing a blood collection vessel or container, e.g. a test-tube or syringe barrel}
- A61B 5/150022: {for capillary blood or interstitial fluid}
- A61B 5/150099: {by negative pressure, other than vacuum extraction into a syringe by pulling on the piston rod or into pre-evacuated tubes}
- A61B 5/150229: {Pumps for assisting the blood sampling}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

Blood samples are obtained from the tails of animals such as mice or rats by a disposable tube located in a stopper and disposed in a vacuum flask. The tube is of such length that the tail extends into a receptacle at the end of the tube in which the samples are collected. Vacuum is communicated into the interior of the tube via a hole therein and promotes the flow of blood from the tail. The posterior of the animal makes a vacuum tight seal with the top of the tube on which the animal is seated. The tube is disposable after a single use.

## Claims

### Claim 1

Apparatus for obtaining blood samples from rodents or small animals, such as mice and rats, having tails extending from the posterior thereof comprising a flask, a stopper, a tube having a blood receptacle at one end thereof, said tube and receptacle having a length approximately equal to that of the tail of the animal and an inside diameter slightly larger than the largest diameter of the tail for receiving said tail, said tube being disposed in said stopper at the end thereof opposite to said one end for seating the posterior of said animal in vacuum tight relationship when said stopper and tube are inserted into said flask, means providing communication for vacuum pressure between the interior of said tube and said flask to promote the flow of blood from said tail into said receptacle.

### Claim 2 (depends on 1)

The invention as set forth in claim 1 wherein said receptacle is separable from said tube and is attached thereto for collecting the blood samples.

### Claim 3 (depends on 1)

The invention as set forth in claim 1 wherein said tube has a flange at said opposite end thereof, said flange being seated on said stopper for providing said vacuum seal with the posterior of the animal.

### Claim 4 (depends on 3)

The invention as set forth in claim 3 wherein said tube has a radius between said flange and the outer surface of said tube which provides for clearance between said stopper and said flange for ease of separation thereof.

### Claim 5 (depends on 1)

The invention as set forth in claim 1 wherein said tube consists either of glass or plastic.

### Claim 6 (depends on 5)

The invention as set forth in claim 5 wherein said tube consists of polypropylene plastic.