Tissue slitting methods and systems

• US 9,413,896 B2
• Filed: 03/14/2013
• Issued: 08/09/2016
• Est. Priority Date: 09/14/2012
• Status: Active Grant

• Current Assignee: Spectranetics Corporation (Koninklijke Philips N.V.)
• Original Assignee: Spectranetics Corporation (Koninklijke Philips N.V.)
• Inventors: Bowe, Wade A., Burton, George Woodrow, Dalby, Paul Joseph, Sotak, Ryan Michael, James, Matthew Allan
• Primary Examiner(s): Severson, Ryan J
• Application Number:
  US13/828,310
• Publication Number:
  US 20140081304A1
• Time in Patent Office: 1,244 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/3203 Fluid jet cutting instruments
• CPC Class Codes: A61B 17/32037 for removing obstructions from inner organs or blood vessels, e.g. for atherectomy
• CPC Class Codes: A61B 17/3207 Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016
• CPC Class Codes: A61B 17/320725 with radially expandable cutting or abrading elements A61B17/32075 takes precedence
• CPC Class Codes: A61B 17/32075 Pullback cutting; combined forward and pullback cutting, e.g. with cutters at both sides of the plaque
• CPC Class Codes: A61B 17/3211 Surgical scalpels, knives; Accessories therefor
• CPC Class Codes: A61B 17/50 Instruments, other than pincettes or toothpicks, for removing foreign bodies from the human body locating otherwise A61B5/06; locating by radiation A61B6/00; removing calculi A61B17/22; from the eyes A61F9/00709
• CPC Class Codes: A61B 18/245 for removing obstructions in blood vessels or calculi
• CPC Class Codes: A61B 2017/320004 abrasive
• CPC Class Codes: A61B 2017/320044 Blunt dissectors blunt suture needles A61B2017/06085
• CPC Class Codes: A61B 90/02 Devices for expanding tissue, e.g. skin tissue implements for holding wounds open, surgical tractors A61B17/02; implantable mammary prosthesis A61F2/12; dilators A61M29/00
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/056 Transvascular endocardial electrode systems
• CPC Class Codes: A61N 1/057 Anchoring means; Means for fixing the head inside the heart
• CPC Class Codes: A61N 2001/0578 having means for removal or extraction
• CPC Class Codes: F04C 2270/041 Controlled or regulated
• CPC Class Codes: G10L 21/00 Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility G10L19/00 takes precedence
• CPC Class Codes: H04L 65/403 Arrangements for multi-party communication, e.g. for conferences data switching systems for conference H04L12/18; arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities H04M3/56; television conferencing systems H04N7/15
• CPC Class Codes: H04M 3/568 audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants echo suppression in two-way loud-speaking telephone systems H04M9/02; sound field processing per se H04S7/30

Abstract

Methods and systems for separating an object, such as a lead, from formed tissue are provided. Specifically, a tissue slitting device is configured to engage patient formed tissue at a slitting engagement point. While the object is subjected to a first traction force, the tissue slitting device is caused to move further into the engaged tissue and slit the tissue past the point of engagement. The slitting device causes the tissue to separate along an axial direction of the length of the formed tissue and releases at least some of the force containing the object. The methods and systems are well suited for use in cardiac pacing or defibrillator lead explant procedures.

Claims

1. A tissue slitting apparatus comprising:

a shaft, wherein the shaft is flexible, the shaft having a proximal and a distal end, and wherein the shaft includes an inner lumen running from the proximal to the distal end to receive at least one of an implanted object and a mechanical traction device, the inner lumen defining a longitudinal axis of the shaft;

a tissue abrading device disposed adjacent to the distal end of the shaft, the tissue abrading device comprising;

a leading edge disposed at a distal portion of the tissue abrading device; and

an abrading tip, wherein the abrading tip is disposed adjacent to the leading edge, wherein the abrading tip includes at least one rotating member, the at least one rotating member having at least one abrasive surface, wherein the at least one rotating member is configured to be operatively coupled with an actuator, and wherein the at least one rotating member is configured to rotate relative to the shaft via an actuation force provided by the actuator; and

a shield disposed adjacent to the abrading tip, wherein the shield partially covers the abrading tip and exposes only a portion of the at least one abrasive surface, and wherein the shield extends into the inner lumen and is disposed between a portion of the abrading tip and the longitudinal axis of the shaft;

wherein the at least one abrasive surface is configured to wear a separation in a tissue growth along a side and a length of the tissue growth, and wherein the tissue slitting apparatus separates a first, but not a second, portion of the tissue growth around a circumference of the implanted object as the at least one rotating member rotates relative to the shaft.

2. The tissue slitting apparatus of claim 1, wherein the at least one abrasive surface is manufactured from a material with at least one of a rough surface, knurl, machined surface, formed surface, and diamond deposition surface.

3. The tissue slitting apparatus of claim 2, wherein the material is made of metal.

4. The tissue slitting apparatus of claim 2, wherein the material is made of plastic.

5. The tissue slitting apparatus of claim 1, wherein the tissue abrading device further comprises the actuator.

6. The tissue slitting apparatus of claim 5, wherein the actuator is powered by an electric motor.

7. The tissue slitting apparatus of claim 5, wherein the actuator is powered by a pneumatic motor.

8. The tissue slitting apparatus of claim 5, wherein the actuator is powered by a hydraulic motor.

9. The tissue slitting apparatus of claim 1, further comprising:

a lead locking device configured to lock onto a lead within a vascular lumen;

wherein the inner lumen is configured to allow the lead to pass therethrough, wherein the lead locking device holds the lead while the at least one abrasive surface wears through a section of tissue surrounding at least a portion of the lead.

10. The tissue slitting apparatus according to claim 9, wherein the lead locking device is configured to lock onto an internal structure of the lead.

11. The tissue slitting apparatus according to claim 9, wherein the lead locking device is configured to lock onto an external structure of the lead.