Therapeutic magnet

• US 4,303,062 A
• Filed: 07/09/1980
• Issued: 12/01/1981
• Est. Priority Date: 07/09/1980
• Status: Expired due to Term

• Current Assignee: Aeromarine SRL
• Original Assignee: Intervet Incorporated (Merck & Co., Inc.)
• Inventors: Vars, Charles A.
• Primary Examiner(s): Howell, Kyle L.
• Application Number:
  US06/167,116
• Time in Patent Office: 510 Days
• Field of Search: 128/1.3, 128/356, 335/302, 335/303
• US Class Current: 600/12
• CPC Class Codes: A61D 1/16 Magnets for the stomach A61D1/12 takes precedence

Abstract

A therapeutic magnet for retention in the stomach of an animal comprises a plastic coated sintered ceramic magnet. The magnet is elongate and of uniform rectangular cross section in planes transverse to its principal dimension. The direction of magnetization is transverse to the principal dimension. The plastic coating serves to retain the separate parts of the magnet in the event of inadvertent fracture of the magnet.

Claims

1. A therapeutic magnetic bar for retention in the second stomach or reticulum of cattle, comprising

an elongate magnet formed of a sintered material having the general formula Mo.6 (Fe₂ O₃), in which MO represents an oxide or oxides of one or more of the metals chosen from the group comprising barium, strontium and lead, said magnet being large enough for permanent retention in said second stomach, having a rectangular cross section in planes transverse to its principal dimension and being magnetized transversely to said dimension with its pole faces comprising the surfaces of greatest area, the length in said principal dimension being at least twice any one of the dimensions in said cross section,

and

a continuous polymeric coating enveloping said magnet and having a substantially uniform thickness and a tear strength sufficient to resist rupture in the event that said magnet is fractured.

2. The therapeutic magnetic bar of claim 1, in which said cross section is substantially uniform throughout said principal dimension.

3. A method of treating cattle for ingestion of ferrous metal objects, consisting of inserting into the second stomach or reticulum a bar comprising an elongate magnet formed of a sintered material having the general formula MO.6 (Fe₂ O₃), in which MO represents an oxide or oxides of one or more of the metals chosen from the group comprising barium, strontium and lead, said magnet being large enough for permanent retention in said second stomach, having a rectangular cross section in planes transverse to its principal dimension and being magnetized transversely to said dimension, with its pole faces comprising the surfaces of greatest area, the length in said principal dimension being at least twice any one of the dimensions in said cross section, and a continuous polymeric coating enveloping said magnet and having a substantially uniform thickness and a tear strength sufficient to resist rupture in the event that said magnet is accidentally fractured.