US 3,978,862 AGranted

Surgical cutting device

AssigneeStryker Corporation

InventorMarshal Morrison

Life of this patent

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Abstract

A surgical cutting device, particularly a sagittal saw, having an elongated tubular housing containing therein a driving mechamism which extends outwardly from one end of the housing and has a saw blade mounted thereon. A driving connection, such as a flexible drive cable or the like, extends into the other end of the housing and is drivingly connected to the driving mechanism. The driving mechanism includes a crank structure connected between a rotatable input shaft and one end of a blade mounting member, which member has the saw blade mounted on the other end thereof. A pivot structure coacts with the blade holding member for permitting angular oscillation of the blade holding member while also simultaneously permitting the blade holding member to be reciprocated in the longitudinal direction thereof. The crank structure causes the blade holding member to be simultaneously angularly oscillated and linearly reciprocated, whereby the blade is cyclically moved around a substantially elliptical path.

Claims10

Dependent claims

In a surgical cutting device having a housing, an elongated blade holding member movably supported relative to said housing, said blade holding member being adapted to have a cutting blade mounted on the outer end thereof, and drive means mounted on said housing and interconnected to said blade holding member for moving same, comprising the improvement wherein:

said drive means includes crank means rotatable about an axis and connected to said blade holding member adjacent the inner end thereof for causing the inner end of said blade holding member to be movably displaced in a circular pattern within a plane which is substantially perpendicular to the rotational axis of said crank means, said crank means including a drive crank member which is rotatable about and eccentrically displaced relative to said rotational axis, said crank member being disposed directly in engagement with said blade holding member adjacent the inner end thereof;
and
support means pivotally and linearly slidably supporting said blade holding member on said housing for permitting simultaneous angular oscillation and linear reciprocation of said blade holding member within a plane substantially perpendicular to said rotational axis in response to rotation of said crank means, said support means engaging said elongated blade holding member intermediate the ends thereof so as to be disposed between the rotatable crank means and the blade, said support means including a support member mounted on said housing for angular movement about a support axis which is fixed relative to said housing, said support member comprising a support crank member which is rotatable about and eccentrically displaced relative to said support axis, said support axis being substantially parallel to but spaced from said rotational axis, one of said support and crank members having slot means associated therewith and extending in the elongated direction of said blade holding member for slidably supporting said blade holding member for linear movement in a direction which is parallel to the longitudinal direction of said blade holding member and perpendicular to said support axis;
and
driving means drivingly interconnecting the drive crank member and the support crank member for simultaneous rotation, whereby the cutting edge of the blade is cyclically moved through a path which defines a closed endless loop in response to movement of said blade holding member by said crank means.

2 more elements

In a surgical cutting device having a housing, an elongated blade holding member movably supported on said housing, said blade holding member being adapted to have a cutting blade releasably attached to the outer end thereof, the improvement comprising drive means drivingly coacting with the blade holding member for causing the cutting edge of said blade to be cyclically moved through a path which defines a closed noncircular endless loop, said drive means including first eccentric means rotatable about a first axis which is substantially perpendicular to the plane defined by said loop, said first eccentric means being drivingly engaged with a portion of said holding member for causing circular displacement thereof in a plane which is substantially perpendicular to said first axis, said drive means including second eccentric means rotatable about a second axis which is spaced from but substantially parallel to said first axis, said second eccentric means being drivingly engaged with a part of said blade holding member for causing movement of said part within said plane in a direction substantially transverse to the longitudinally extending direction of said blade holding member, relative movement permitting means coacting between said second eccentric means and said blade holding member for permitting relative slidable movement therebetween substantially in the longitudinal direction of said blade holding member, said relative movement permitting means preventing relative movement between the blade holding member and said second eccentric means in said transverse direction so that said part of the blade holding member is moved in said transverse direction in response to rotation of said second eccentric means, and means drivingly interconnecting said first and second eccentric means for simultaneous rotation about their respective axes.

Dependencies are inferred from the claim text.

Facts

Application: 05/500,373Filed 26 Aug 1974
Granted: 7 Sep 1976
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B27B 19/006
Other reciprocating saws with power drive; Fret-saws: with oscillating saw blades; Hand saws with oscillating saw blades
A61B 17/142
Surgical saws: with reciprocating saw blades, e.g. with cutting edges at the distal end of the saw blades
A61B 17/144
With reciprocating saw blades, e.g. with cutting edges at the distal end of the saw blades: with cutting edges at the side of the saw blades
B23D 49/165
Pad sawing devices: with means to move the saw blades in an orbital path