Needle/stylet combination

• US 4,931,059 A
• Filed: 10/03/1988
• Issued: 06/05/1990
• Est. Priority Date: 11/24/1986
• Status: Expired due to Fees

• Current Assignee: Charles W. Markham
• Original Assignee: Charles W. Markham
• Inventors: Markham, Charles W.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US07/252,740
• Time in Patent Office: 610 Days
• Field of Search: 128/329 R.751-754, 128/305, 128/303 R, 128/654, 604/164, 604/165, 604/178, 606/185
• US Class Current: 606/185
• CPC Class Codes: A61B 2017/00349 Needle-like instruments having hook or barb-like gripping means, e.g. for grasping suture or tissue A61B17/06066 takes precedence
• CPC Class Codes: A61B 2017/3484 Anchoring means, e.g. spreading-out umbrella-like structure
• CPC Class Codes: A61B 2090/3908 Soft tissue, e.g. breast tissue
• CPC Class Codes: A61B 2090/3987 Applicators for implanting markers
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers

Abstract

A needle/stylet combination for use as a marking needle or retraction needle comprising a hollow needle including a barb slot formed in the distal portion thereof having a distal end configured to penetrate tissue, a stylet including a single resilient barb formed on the distal end thereof slidably disposed within the hollow needle, and a stylet retraction limiting structure formed on the stylet in space relationship relative to the distal end of the single resilient barb, the axial length of the spaced relationship thereof being greater than the axial length of the barb slot such that when the single resilient barb is positioned distally relative to the barb slot the hollow needle houses the single resilient barb and when the stylet member is retracted in a distal to proximal direction the proximal portion of the single resilient barb extends outwardly through the barb slot whereby the stylet retraction limiting structure engages the proximal end of the barb slot to retain the distal end of the single resilient barb within the hollow needle and as the stylet is advanced axially in the proximal to distal direction the single resilient barb re-enters the hollow needle.

Claims

1. A needle/stylet combination for use as a marking needle or retraction needle comprising a hollow needle including a barb slot formed in the distal portion thereof, a stylet including a single resilient barb affixed to the distal portion thereof, said stylet and single resilient barb normally disposed within said hollow needle, said single resilient barb including an inclined portion in spaced relationship relative to the distal end of said stylet, said stylet including a channel formed therein to receive the distal end of said single resilient barb and a recess to selectively receive said inclined portion, the axial length from distal end of said stylet to the distal end of said inclined portion being greater than the axial length of said barb slot such that when said single resilient barb is positioned distally relative to said barb slot, said hollow needle houses said single resilient barb and when said stylet is retracted in a distal to proximal direction said inclined portion of said single resilient barb extends outwardly through said barb slot whereby said inclined portion engages the proximal end of said barb slot to retain the distal end of said stylet within said hollow needle and as said stylet is advanced axially in the proximal to distal direction said inclined portion of said single resilient barb re-enters said hollow needle.

2. The needle/stylet combination of claim 1 further includes a needle holder to control proximal to distal movement of said hollow needle relative to the surface of a patient'"'"'s skin when said hollow needle is operably positioned.

3. The needle/stylet combination of claim 2 wherein said needle holder comprises a flexible arcuate member having a gripper formed on the periphery thereof and a centrally disposed aperture formed therethrough disposed in relationship relative to said hollow needle, a retainer element formed on said flexible arcuate member adjacent said centrally disposed aperture to normally engage said hollow needle, said flexible arcuate member being flexed to disengage said retainer element from said hollow needle to permit axial movement thereof.

4. The needle/stylet combination of claim 1 further includes an index means to provide a visual indication of axial alignment of said inclined portion of said single resilient barb relative to said barb slot.

5. The needle/stylet combination of claim 4 wherein said index means comprises a first index formed on the proximal portion of said stylet and a second index formed on the proximal portion of said hollow needle.

6. The needle/stylet combination of claim 1 wherein the proximal end of said inclined portion comprises a cam surface.

7. The needle/stylet combination of claim 1 wherein said recess further includes an inclined notch formed on opposite sides thereof.