Method for the detection, location and extraction of an intrauterine device

• US 4,572,162 A
• Filed: 01/23/1984
• Issued: 02/25/1986
• Est. Priority Date: 01/23/1984
• Status: Expired due to Term

• Current Assignee: Ortho Pharmaceutical Corporation (Johnson & Johnson)
• Original Assignee: Ortho Pharmaceutical Corporation (Johnson & Johnson)
• Inventors: Tatum, Howard J., Livesay, Billy R., Toews, Melvin R.
• Primary Examiner(s): Shine, W. J.
• Application Number:
  US06/573,073
• Time in Patent Office: 764 Days
• Field of Search: 128/1 R, 128/130, 128/303 R, 128/303.1, 128/653, 128/654
• US Class Current: 128/840
• CPC Class Codes: A61B 17/52 Magnets
• CPC Class Codes: A61B 5/06 Devices, other than using radiation, for detecting or locating foreign bodies for removing same A61B17/50 ; determining position of probes within or on the body of the patient
• CPC Class Codes: A61B 5/062 using magnetic field
• CPC Class Codes: A61F 6/18 Inserters or removers ; Apparatus for loading an intra-uterine device into an insertion tube

Abstract

A system for the detection, location and extraction of an intrauterine device ("IUD") including a magnetic IUD, a locator probe to be used intravaginally and an extractor probe to be used intrauterinally, both containing at least one Hall effect generator. The probe is inserted into the patient and an indicator means is provided to communicate the presence of the IUD, in the case of the locator, or the distance of the IUD from the probe, in the case of the extractor. After positioning the extractor next to the IUD using the indicator for guidance, grasping means in the extractor is actuated to effect temporary attachment of the IUD to the extractor which is then withdrawn from the uterus.

Claims

1. A method for the detection, location and extraction of an intrauterine device having a magnetic portion located in a projecting portion of the device, which comprises the steps of:

a. inserting into the uterus of a patient a probe comprising a grasping means and at least two Hall effect generators disposed perpendicularly to each other in electrical connection with an indicator means which responds to the output voltage of the Hall generators;

b. sensing the location of the magnetic portion with the probe,

c. adjusting the position of the probe in response to the indicator means until the probe is in close proximity to the intrauterine device;

d. actuating the grasping means to grasp a portion of the intrauterine device within the uterus; and

e. extracting the probe together with the intrauterine device from the uterus.

2. The method of claim 1, wherein said probe is constructed of materials which are incapable of holding a magnetic dipole.

3. The method of claim 1, wherein said intrauterine device is a T shaped intrauterine device.

4. The method of claim 3, wherein said magnetic portion is located in the stem of the T shaped intrauterine device.

5. The method of claim 1, wherein the ratio of the distance between the poles of the dipole of the magnetic portion and the cross-section of the magnetic portion is at least 2:

1.

6. The method of claim 5, wherein said ratio is at least 5:

1.

7. The method of claim 1, wherein said grasping means is actuated by a plunger.

8. The method of claim 1, wherein said grasping means comprises at least two opposing finger members which separate when actuated.

9. The method of claim 1, wherein the magnetic portion comprises homogeneously dispersed particulate magnetic material.

10. The method of claim 1, wherein said magnetic material is a rare-earth-cobalt alloy.

11. The method of claim 1, wherein said probe comprises three Hall effect generators disposed perpendicularly to each other.