DIAGNOSTIC MYELOGRAPHY NEEDLE

• US 3,709,211 A
• Filed: 07/02/1970
• Issued: 01/09/1973
• Est. Priority Date: 07/02/1970
• Status: Expired due to Term

• Current Assignee: Fred B. Hawkins
• Original Assignee: Fred B. Hawkins
• Inventors: Hawkins, Fred B.
• Primary Examiner(s): Howell, Kyle L.
• Application Number:
  US05/051,959
• Time in Patent Office: 922 Days
• Field of Search: 128/2B,2R,2F,2A,2.5D,221,347,348,350,DIG.5 27/24A
• US Class Current: 600/573
• CPC Class Codes: A61B 17/32 Surgical cutting instruments A61B18/042 takes precedence; suture cutters A61B17/0467; instruments for ligaturing or cutting A61B17/128; instruments for rupturing the amniotic membrane A61B17/4208; specially adapted knives for eye surgery A61F9/0133
• CPC Class Codes: A61B 17/3401 Puncturing needles for the peridural or subarachnoid space or the plexus, e.g. for anaesthesia local anaesthesia A61M19/00
• CPC Class Codes: A61B 2017/347 Locking means, e.g. for locking instrument in cannula
• CPC Class Codes: A61M 1/84 Drainage tubes; Aspiration tips for negative pressure wound therapy A61M1/90; for surgical cutting instruments A61B17/32

Abstract

A surgical needle for injecting and removing fluid material from channels of the human body such as the spinal canal. The needle is provided with a lumen closed by a stylus during insertion. The stylus is removed for permitting the injection of fluid and a second stylus smaller than the lumen and projecting beyond the end of the needle is inserted to prevent the body tissues from closing the lumen during aspiration of the injected fluids.

Claims

1. A diagnostic myelography needle for injecting fluids into and aspirating fluids from the spinal canal of a living patient, comprising a generally cylindrical head, said head having an axial bore extending therethrough, a socket formed in one end of said head communicating with the axial bore in said head, a hub integrally formed with said head and extending laterally therefrom, said hub having a closable bore extending therethrough communicating with the bore in said head, an elongate cylindrical shank formed on the end of said head opposite said socket, said shank having an axial bore extending therethrough communicating with the bore in said head, an angularly truncated sharpened cutting needle edge on the end of said shank opposite said head, a plug slidably seated in said socket, cooperating interfitting means on said plug and socket to align said plug and socket and prevent relative rotation therebetween, an elongate rod fixed on said plug to extend through the bore in said shank, said rod having a diameter substantially less than the diameter of the bore in said shank, a restraining element fixed to the distal end of said rod and extending slightly beyond said needle edge of the shank to hold nerve roots and meninges away from the open needle end of said shank and prevent clogging thereof by soft tissues, whereby to reduce pain to the patient during aspiration of fluids used for diagnosis of inter-spinal lesions.

2. A myelography needle as claimed in claim 1, wherein said restraining element comprises a single loop formed on the distal end of said rod, said loop having its major lateral dimension slightly less than the diameter of the bore of said shank, said rod and said loop having a length such that upon seal seating of said plug in said socket the terminal end of said loop will extend slightly beyond the truncated end of said shank.

3. A device as claimed in claim 1, wherein the cooperating interfitting means on said plug and socket for aligning and preventing relative rotation therebetween comprises a notch formed in said socket and a guide key formed in said plug for engagement in said notch.