Method and apparatus for testing bag-like means

• US 5,524,478 A
• Filed: 04/05/1995
• Issued: 06/11/1996
• Est. Priority Date: 07/28/1992
• Status: Expired due to Fees

• Current Assignee: Charter International PLC (Enovis Corp.)
• Original Assignee: Charter International PLC (Enovis Corp.)
• Inventors: Rhodes, Ian, Skingsley, John, Joy, Brian, Smith, Rod
• Primary Examiner(s): Williams, Hezron E.
• Assistant Examiner(s): WIGGINS, JOHN DAVID
• Application Number:
  US08/417,472
• Time in Patent Office: 433 Days
• Field of Search: 73/40, 73/40.7, 73/41, 73/45, 73/45.2
• US Class Current: 73/40
• CPC Class Codes: G01M 3/227 for flexible or elastic containers
• CPC Class Codes: G01M 3/3218 for flexible or elastic containers

Abstract

An apparatus for simultaneously detecting leaks in a plurality of flexible, collapsible bag-like devices is disclosed. The apparatus comprises a platen having a plurality of openings for receiving bag-like devices or contraceptive devices such as a female condom made of latex, polyurethane, or other polymer material. The apparatus has a first pressurizing device for pressuring the bag-like device in the platen with a medium such as air. A pressure sensor is used for detecting a failure to hold a selected pressure in each of the pressurized bag-like devices. The apparatus has an identification device for identifying bag-like devices exhibiting a failure to hold the selected pressure. An evacuation device for evacuating the bag-like device is used. The apparatus has a second pressurizing device for pressurizing the bag-like device with a leak detection medium and a detector for detecting any leak detection medium leaking from the bag-like device. A method for testing bag-like devices or contraceptive devices is, also, disclosed.

Claims

1. An apparatus for simultaneously detecting leaks in a plurality of flexible, collapsible bag-like means comprising:

at least one platen having a plurality of apertures for supporting and receiving bag-like means;

first pressurizing means for pressurizing said bag-like means in said platen with a pressurizing medium;

pressure sensor means for detecting a failure to hold a selected pressure in each of said pressurized bag-like means;

identification means for identifying bag-like means exhibiting said failure to hold said selected pressure;

evacuation means for evacuating said bag-like means;

second pressurizing means for pressurizing said bag-like means with a leak detection medium, where the second pressurizing means is to be applied only to each of said pressurized bag-like means that are able to withstand without failure said selected pressure of said first pressurizing means; and

detection means for detecting any said leak detection medium leaking from said bag-like means.

2. The apparatus of claim 1, further comprising a conveyer for transporting a plurality of said platens, to and from said apparatus for simultaneously detecting leaks in a plurality of bag-like means.

3. The apparatus of claim 2, wherein said first and second pressurizing means comprises at least one gas source and a header having a plurality of gas inlets, said header being movably disposed for contacting said platen in a sealing relationship so that each said gas inlet is in communication with one bag-like means in said platen.

4. The apparatus of claim 3, wherein said header is mounted above said conveyer for reciprocating movement with said transported platens.

5. The apparatus of claim 4, wherein said header further comprises a sealing means around each said gas inlet for individually sealing each of said bag-like means in said platen.

6. The apparatus of claim 3, claim 4, or claim 5, wherein said header further comprises first valve means for selectively introducing said pressurizing medium into said bag-like means.

7. The apparatus of claim 6, wherein said header comprises a second valve means for selectively introducing said leak detection medium into each bag-like means.

8. The apparatus of claim 7, wherein said identification means comprises means for controlling said second valve means in response to a bag-like means exhibiting said failure to hold said selected pressure.

9. The apparatus of claim 1, further comprising a collection tray and means for sealing said collection tray with said platen, said collection tray collects said leak detection medium leaked from said bag-like means.

10. The apparatus of claim 9, further comprising means for removing leak detection medium from said collection means and transferring said leak detection medium to said detection means.

11. The apparatus of claim 10, further comprising a molecular sieve, said molecular sieve separates said pressurizing medium from said leak detection medium before said leak detection medium is transferred to said detection medium.

12. The apparatus of claim 11, wherein separated leak detection medium passes to detection means, said detection means being a mass spectrometer for detecting said leak detecting medium.

13. The method of claim 12, wherein said leak detection medium is helium.

14. The apparatus of claim 1, further comprising means for purging said leak detecting medium from said bag-like means.

15. A method for simultaneously detecting leaks in a plurality of flexible, collapsible bag-like means comprising the steps of:

positioning a plurality of said bag-like means on a platen, said platen having a plurality of apertures, each aperture being adapted to receive and retain one of said bag-like means;

pressurizing each of said bag-like means to a selected pressure with a pressurizing medium;

detecting any failure to hold said selected pressure in each of said bag-like means and identifying any bag-like means exhibiting said failure to hold said selected pressure;

evacuating each bag-like means;

charging each bag-like means with a leak detection medium, where the charging is only performed on each of said bag-like means that are able to withstand without failure said selected pressure of said pressurizing; and

detecting any leak of said leak detection medium from said bag-like means.

16. The method of claim 15, wherein said pressurizing is performed individually for each of said bag-like means by one of a plurality of pressurizing means.

17. The method of claim 16, further comprising deactivating a selected pressurizing means for an identified bag-like means exhibiting a failure to hold said selected pressure.

18. The method of claim 15 or claim 16, further comprising positioning and sealing said platen on a collection tray for collecting said leak detection medium leaking from said bag-like means.

19. The method of claim 18, further comprising withdrawing a mixture of said pressurizing medium and said leak detection medium from said collection tray and separating said pressurizing medium from said leak detection medium by a molecular sieve.

20. The method of claim 19, further comprising passing said mixture through a molecular sieve to separate said pressure medium and said leak detection medium, said pressure medium being vented as exhaust and separated leak detection medium being passed to a means for detecting said leak detection medium.

21. The method of claim 15, further comprising purging said bag-like means and platen with air.