Precision depth guided instruments for use in vertebroplasty

• US 6,019,776 A
• Filed: 10/14/1997
• Issued: 02/01/2000
• Est. Priority Date: 10/14/1997
• Status: Expired due to Term

• Current Assignee: NeuroTherm, Inc. (Abbott Laboratories)
• Original Assignee: Parallax Medical, Inc. (Abbott Laboratories)
• Inventors: Jensen, Mary E., Dion, Jacques E., Preissman, Howard
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): REIP, DAVID OWEN
• Application Number:
  US08/950,382
• Time in Patent Office: 840 Days
• Field of Search: 600/562, 600/564, 600/565, 600/566, 600/567, 604/164, 604/165, 604/170, 606/170, 606/171, 606/184, 606/185, 606/61, 606/73, 623/16, 623/17
• US Class Current: 606/185
• CPC Class Codes: A61B 17/3403 Needle locating or guiding means guides for suture needles A61B17/0482; guiding or tracking by nuclear magnetic resonance G01R33/285
• CPC Class Codes: A61B 17/3472 for bones, e.g. intraosseus injections
• CPC Class Codes: A61B 17/3494 with safety means for protection against accidental cutting or pricking, e.g. limiting insertion depth, pressure sensors for the peridural space A61B17/3401
• CPC Class Codes: A61B 17/3496 Protecting sleeves or inner probes; Retractable tips for protecting body piercing guide needles A61M25/0612
• CPC Class Codes: A61B 17/8811 characterised by the introducer tip, i.e. the part inserted into or onto the bone
• CPC Class Codes: A61B 2090/061 for measuring dimensions, e.g. length
• CPC Class Codes: A61B 2090/062 penetration depth

Abstract

Precision depth guided instruments are provided for use in performing percutaneous implantation of hard tissue implant materials. A depth guided stylet include a point adapted for piercing hard tissue, self-tapping threads for self-tapping into hard tissue, and, optionally, a second set of threads for meshing with threads within a overfitting cannula. The stylet may include an elongated rod having a first section having a first diameter, and a second section having a second diameter larger than the first diameter. A cannula for use with a depth guided stylet includes an elongated tube having first and second open ends adapted for a depth guided stylet to pass therethrough. The cannula may include threads along at least a portion of an interior circumference of the elongated tube, which are adapted to mate with threads on an exterior circumference of the depth guided stylet. Alternatively, a set of intersecting grooves may be included in the handle of the cannula to mate with a protrusion on the handle of the stylet. A method of using the instruments is also disclosed, as is a kit which includes the instruments and which is used to open a pathway into hard tissue.

Claims