Endoscopic surgical clip applier

• US 8,486,091 B2
• Filed: 08/16/2012
• Issued: 07/16/2013
• Est. Priority Date: 08/29/2008
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Sorrentino, Gregory, Whitfield, Kenneth H.
• Primary Examiner(s): EREZO, DARWIN P
• Application Number:
  US13/586,931
• Publication Number:
  US 20120310259A1
• Time in Patent Office: 334 Days
• Field of Search: 606139-142
• US Class Current: 606/143
• CPC Class Codes: A61B 17/0682 for applying U-shaped staples or clamps, e.g. without a forming anvil
• CPC Class Codes: A61B 17/083 Clips, e.g. resilient
• CPC Class Codes: A61B 17/105 Wound clamp magazines for packaging sharps A61B50/3001
• CPC Class Codes: A61B 17/12 for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord specially adapted for vas deferens or fallopian tubes A61F6/20; materials for ligaturing blood vessels A61L17/00
• CPC Class Codes: A61B 17/128 for applying or removing clamps or clips
• CPC Class Codes: A61B 17/1285 for minimally invasive surgery
• CPC Class Codes: A61B 2017/12004 for haemostasis, for prevention of bleeding

Abstract

An apparatus for application of surgical clips to body tissue is provided and includes a handle assembly; a shaft assembly including a housing extending distally from the handle assembly and defining a longitudinal axis; a plurality of surgical clips disposed within the shaft assembly; a jaw mounted adjacent a distal end portion of the shaft assembly, the jaw being movable between an open spaced-apart condition and a closed approximated condition; and a pusher bar reciprocally disposed within the housing of the shaft assembly and being detachably connectable to the housing of the shaft assembly, the pusher bar being configured to load a distal-most surgical clip into the jaws during distal movement and remain connected to the housing of the shaft assembly and in a distally advanced position during an approximation of the jaws.

Claims

1. An apparatus for application of surgical clips to body tissue, the apparatus comprising:

an elongate endoscopic shaft assembly extending distally from a handle assembly and defining a longitudinal axis, the shaft assembly including;

a housing;

a jaw mounted adjacent a distal end portion of the housing, the jaw being movable between an open spaced-apart condition and a closed approximated condition;

a clip carrier disposed in the shaft assembly and defining a clip channel,

a plurality of surgical clips slidably disposed within the clip channel of the clip carrier;

a pusher bar reciprocally disposed within the housing of the shaft assembly, the pusher bar being configured to load a distal-most surgical clip, of the plurality of surgical clips, into the jaws during each distal advancement of the pusher bar, the pusher bar including a proximally extending catch;

a clip follower slidably disposed within the clip channel of the clip carrier and disposed proximally of the plurality of surgical clips, the clip follower includes a lock-out tab extending from a surface thereof, the lock-out tab defining a window, wherein the window of the lock-out tab receives the catch of the pusher bar following a firing of a final surgical clip thereby preventing movement of the pusher bar in a proximal direction.

2. The apparatus according to claim 1, wherein following a firing of a final surgical clip the clip follow is prevented from moving proximally.

3. The apparatus according to claim 2, wherein the pusher bar defines a catch window, and wherein the catch of the pusher bar extending proximally into the catch window;

and

wherein the lock-out tab is biased against a surface of the pusher bar such that following the firing of the final surgical clip, the lock-out tab of the clip follower is in registration with the catch window of the pusher bar, whereby the lock-out tab extends into the catch window, and whereby the window of the lock-out tab is moved into axial alignment with a travel path of the catch of the pusher bar to receive the catch of the pusher bar.

4. The apparatus according to claim 3, further comprising:

a connector plate reciprocally disposed within the shaft assembly, wherein the connector plate is detachably connectable to the pusher bar, wherein during an initial distal movement of the connector plate the pusher bar is distally advanced and during a further distal movement of the connector plate the connector plate is disconnected from the pusher bar.

5. The apparatus according to claim 4, further comprising:

an advancer plate reciprocally disposed within the shaft assembly, the advancer plate including at least one fin engageable by a shoulder of the pusher bar, wherein the shoulder of the pusher bar engages the at least one fin of the advancer plate during a distal and a proximal movement of the pusher bar to effectuate one of a distal and proximal movement of the advancer plate.

6. The apparatus according to claim 5, wherein the clip follower includes:

a first tab projecting from a first surface thereof; and

a second tab projecting from a second surface thereof,

wherein the first tab of the clip follower is engaged by the advancer plate as the advancer plate is moved distally to move the clip follower distally to an incrementally advanced position, whereby the plurality of surgical clips are concomitantly moved to an incrementally advanced position, and

wherein the second tab of the clip follower engages a stop feature as the advancer plate is moved proximally, whereby the clip follower is held in the incrementally advanced position.

7. The apparatus according to claim 6, wherein the second tab of the clip follower engages stop features projecting from the clip carrier.

8. The apparatus according to claim 5, wherein the advancer plate is interposed between the pusher bar and the clip follower.

9. The apparatus according to claim 8, wherein following the firing of the final surgical clip, the lock-out tab of the clip follower extends through the advancer plate and into the catch window of the pusher bar.

10. The apparatus according to claim 4, wherein the pusher bar includes a first spring clip supported thereon for connecting to a stationary feature provided in the housing of the shaft assembly when the pusher bar is in an advanced position for maintaining the pusher bar in the advanced position.

11. The apparatus according to claim 10, wherein the pusher bar further includes a second spring clip supported thereon for engaging a first feature of the connector plate, wherein the first feature of the connector plate disengages from the second spring clip following the initial distal movement of the connector plate.

12. The apparatus according to claim 1, wherein the pusher bar includes a pusher formed at a distal end thereof, wherein the pusher has a narrow profile for contacting a backspan of a surgical clip that has been loaded into the jaw at a single location.

13. The apparatus according to claim 12, wherein the pusher defines a plane that is oriented substantially orthogonal to an axis defined by the backspan of the loaded surgical staple.

14. The apparatus according to claim 1, further comprising a ratchet assembly that is prevented from re-setting itself when the pusher bar does not return to a fully proximal position.

15. The apparatus according to claim 14, further comprising:

a handle assembly including a trigger and a drive bar reciprocally translatable by the trigger upon an actuation thereof, wherein the shaft assembly is supported by and extends distally from the handle assembly.

16. The apparatus according to claim 14, wherein the ratchet assembly is disposed in the handle assembly.