US 11,109,880 B2Granted

Surgical instrument with ultrasonic tip for fibrous tissue removal

AssigneeStryker European Operations Holdings LLC

InventorCathal Heavey

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Abstract

An ultrasonic tip for fibrous tissue removal. The ultrasonic tip may be configured for at least torsional vibration and coupled to a distal end of a shaft of a surgical instrument with the shaft including a vibration conversion mechanism. The ultrasonic tip includes a plurality of slots extending between inner and outer circumferential surfaces to form a plurality of teeth. A depth of one of the slots at the outer circumferential surface is greater than a depth of the slot at the inner circumferential surface to define a sloped surface. The teeth include a cutting edge defined between the outer circumferential surface and a side surface defining the slot. The cutting edge includes a positive rake angle. The teeth may further include an inner cutting edge defined between the sloped surface and the inner circumferential surface with the inner cutting edge having a positive rake angle.

Claims18

Dependent claims

An ultrasonic device comprising:

a shaft extending axially between a proximal end and a distal end with said shaft defining a central lumen configured to apply suction to tissue and including a vibration conversion mechanism configured to produce combined torsional and longitudinal vibration;
and
a head portion extending from said shaft axially along an axial axis to a distal end with said head portion comprising an inner circumferential surface, an outer circumferential surface, and a plurality of slots extending from said distal end and between said inner and outer circumferential surfaces to form a plurality of teeth,
wherein a depth of one of said plurality of slots at said outer circumferential surface is greater than a depth of said one of said plurality of slots at said inner circumferential surface to define an inner cutting edge having an inner positive rake angle configured to slice tissue so as to be suctioned into said central lumen,
wherein one of said plurality of teeth comprises a side cutting edge having a side positive rake angle with said side cutting edge defined between said outer circumferential surface and a side surface defining said one of said plurality of slots, said side surface of said one of said plurality of slots extending between said inner and outer circumferential surfaces of said head portion, and
wherein each of said plurality of teeth comprises a distal end, and a distal cutting edge defined between said distal end and said one of said plurality of slots, wherein said distal cutting edge comprises a distal positive rake angle such that said distal cutting edge is configured to meet the tissue at an obtuse angle during the torsional vibration.

3 more elements

An ultrasonic device comprising:

a shaft extending axially between a proximal end and a distal end with said shaft including a vibration conversion mechanism to produce combined torsional and longitudinal vibration;
and
a head portion extending from said shaft axially along an axial axis to a distal end with said head portion comprising an inner circumferential surface, an outer circumferential surface, and a plurality of slots extending from said distal end and between said inner and outer circumferential surfaces to form a plurality of teeth,
wherein one of said plurality of teeth comprises a side cutting edge having a side positive rake angle with said side cutting edge defined between said outer circumferential surface and a side surface defining one of said plurality of slots, said side surface of said one of said plurality of slots extending between said inner and outer circumferential surfaces of said head portion, and
wherein each of said plurality of teeth comprises a distal end, and a distal cutting edge defined between said distal end and said one of said plurality of slots, wherein said distal cutting edge comprises a distal positive rake angle such that said distal cutting edge is configured to meet tissue at an obtuse angle during the combined torsional and longitudinal vibration.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/843,740Filed 15 Dec 2017 · continuation
Priority: 17 Jun 2015
Published: US 2018/0103976 A119 Apr 2018
Granted: 7 Sep 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

A61B 17/320068
Surgical cutting instruments: using mechanical vibrations, e.g. ultrasonic
A61B 2017/320078
Working tips with special features, e.g. extending parts: tissue manipulating surface
A61B 2017/320098
Using mechanical vibrations, e.g. ultrasonic: with transverse or torsional motion
A61B
Medical diagnosis and surgery