Surgical sagittal saw with quick release indexing head and low blade-slap coupling assembly
First Claim
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1. A surgical saw comprising:
- a housing having a distal end, said housing being formed so that there is an opening in the distal end and an interior wall that extends inwardly from the opening;
a motor disposed in said housing;
a head located adjacent the housing distal end opening and a neck integral with the head that extends into the housing distal end opening that is able to rotate within the housing distal end opening, the rotation of the neck resulting in the rotation of the head around an axis that extends from the housing distal end;
a blade mount attached to said head to rotate with said head around the housing distal end, said blade mount having a retention assembly for removably holding a saw blade and being attached to said head to oscillate;
a drive link that extends from said motor to said blade mount through said neck, said drive link configured to, upon actuation of said motor, oscillate said blade mount;
a first ring of a plurality of bearings disposed around the interior wall of said housing so as to be located between the housing interior wall and said neck, said bearings able to move relative to both said housing and said neck and wherein said bearings extend circumferentially around said drive link;
a retaining assembly located between said housing and said neck and around said drive link, said retaining assembly configured to urge said neck against the first ring of bearings and retain said neck in said housing wherein, when said neck is disposed against the first ring of bearings, said neck is able to rotate against the first ring of bearings and around the axis that extends from the housing distal end; and
a lock assembly separate from said retaining assembly that extends between said housing and said neck, said lock assembly having a moveable lock pin that selectively engages in either one of said housing or said neck for releasably holding said neck in a fixed rotational position in the housing bore.
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Abstract
A surgical sagittal saw with a head that is able to index, rotate, relative to the longitudinal axis of the saw housing. The head has a neck that extends into an open distal end of the housing. A biasing assembly holds the head and neck sub-assembly in the open distal end of the housing. The biasing assembly is rotatable relative to the housing. A separate lock mechanism selectively holds the head in a fixed orientation around the saw housing longitudinal axis.
23 Citations
30 Claims
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1. A surgical saw comprising:
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a housing having a distal end, said housing being formed so that there is an opening in the distal end and an interior wall that extends inwardly from the opening; a motor disposed in said housing; a head located adjacent the housing distal end opening and a neck integral with the head that extends into the housing distal end opening that is able to rotate within the housing distal end opening, the rotation of the neck resulting in the rotation of the head around an axis that extends from the housing distal end; a blade mount attached to said head to rotate with said head around the housing distal end, said blade mount having a retention assembly for removably holding a saw blade and being attached to said head to oscillate; a drive link that extends from said motor to said blade mount through said neck, said drive link configured to, upon actuation of said motor, oscillate said blade mount; a first ring of a plurality of bearings disposed around the interior wall of said housing so as to be located between the housing interior wall and said neck, said bearings able to move relative to both said housing and said neck and wherein said bearings extend circumferentially around said drive link; a retaining assembly located between said housing and said neck and around said drive link, said retaining assembly configured to urge said neck against the first ring of bearings and retain said neck in said housing wherein, when said neck is disposed against the first ring of bearings, said neck is able to rotate against the first ring of bearings and around the axis that extends from the housing distal end; and a lock assembly separate from said retaining assembly that extends between said housing and said neck, said lock assembly having a moveable lock pin that selectively engages in either one of said housing or said neck for releasably holding said neck in a fixed rotational position in the housing bore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A surgical sagittal saw, said saw including:
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a housing; a motor disposed in said housing; a blade mount moveably mounted to said housing, said blade mount having a slot for receiving a sagittal saw blade, the saw blade having opposed face surfaces that have a width thereacross and opposed edge surfaces located between the face surfaces, and corners where adjacent face and edge surfaces meet, the slot being defined by opposed top and bottom surfaces in said blade mount and opposed side walls in said blade mount that extend between the top and bottom surfaces, at least one of the side walls having a first surface that is spaced from the surface of the opposed side wall to define a slot first section having a width greater than the width of the face surfaces of the saw blade and a second surface that extends from the first surface and is tapered inwardly so as to have a section thereof that is spaced from the surface of the opposed side wall to define a slot second section having a width less than the width of the face surfaces of the saw blade; a retaining member mounted to said blade mount that extends into the slot second section for receiving a complementary retaining feature of the saw blade; a clamping assembly attached to said blade mount, said clamping assembly having; a head moveably attached to said blade mount, said head having a run position in which said head is located adjacent one of the top or bottom interior surfaces of said blade mount so as to abut one of the face surfaces of the saw blade so as to urge the saw blade from the slot first slot section to the second slot section so that the blade corners distal to the head are pressed against the blade side walls and the blade is pressed towards the retaining member and a load position in which said head is retracted away from the top or bottom interior surface so that the blade can be removed from the blade mount slot; and a manually actuated control member the moves the head between the run and load positions; and a drive mechanism that extends from said motor to said blade mount for oscillating said blade mount in a sagittal pattern. - View Dependent Claims (10, 11, 12, 13, 14, 27)
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15. A surgical sagittal saw, said saw including:
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a housing; a motor disposed in said housing; a blade mount, said blade mount having; a stem with a longitudinal axis that is mounted to said housing to oscillate about the longitudinal axis; and a head integral with said stem so as to move with said stem, said blade mount head defining a slot that is open to receive a surgical sagittal saw blade, the slot being defined by;
opposed top and bottom surfaces in said head; and
opposed side walls in said head that extend between the top and bottom surfaces, at least one side wall formed to have first and second surfaces, the first surface being spaced apart from the opposed side wall so as to define a slot first section that has a width, the second surface tapering inwardly from the first surface so as to define a slot second section that has a width less than the width of the slot first section;a clamping assembly, said clamping assembly including; a clamping head that is moveably mounted to said blade mount stem so as to have a run position in which said clamping head is adjacent one of the slot-defining top or bottom surfaces in said blade mount head so as to abut a sagittal saw blade and urge the blade into the slot second section so that opposed corners of the saw blade abut the opposed slot-defining side surfaces in the saw head and a load position in which said clamping head is spaced from the one of the slot-defining top or bottom surfaces in said blade mount head so that the sagittal saw blade can move into the slot first section; and a manually actuated control member for moving the clamping head between the run and load positions; and a drive link connected between said motor and said blade mount stem configured to, upon actuation of said motor, oscillate said stem so that said blade mount displaces the saw blade in a sagittal motion. - View Dependent Claims (16, 17, 18, 19, 20, 28, 29, 30)
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21. A surgical saw, said saw including:
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a housing, said housing having a distal end with an opening and an interior surface that defines a bore that extends proximally from the distal end opening; a motor disposed in said housing; a saw head located forward of the housing; a neck that extends proximally from said saw head into the housing bore so as to rotate in the housing bore, the rotation of said neck resulting in a like rotation of said saw head; a blade mount mounted to said saw head to rotate with the saw head, said blade mount being configured to removably receive a saw blade and being mounted to said saw head to oscillate around an axis that extends through the saw head; a drive link that extends from said motor, through said neck to said blade mount, said drive link configured to, upon actuation of said motor, oscillate said blade mount; a first ring of bearings disposed around the housing interior surface so as to be located between the housing interior surface and said neck, the first ring of bearings comprising a plurality of individual bearings that are rotatable relative to both said housing and said neck and wherein the first ring of bearings extend around said drive link; a second ring of bearings disposed around the housing interior surface so as to be located between the interior surface and said neck, said second ring of bearings being longitudinally spaced from the first ring of bearings along the housing interior surface and comprising a plurality of individual bearings that are rotatable relative to both said housing and said neck and wherein the second ring of bearings extend around said drive link; a ring disposed over said neck so as to be rotatable relative to said neck, said ring located adjacent the second ring of bearings; a retaining assembly located between said neck and said housing and that is located adjacent said ring, said retaining assembly configured to impose force on both said neck and said ring so as to simultaneously urge said neck against the first ring of bearings and said ring against the second ring of bearings so as to hold said neck in said housing; a lock pin moveably mounted to one of said housing or said neck to releasably engage the other of said neck or said housing so that when said lock pin is so engaged, said lock blocks rotation of said neck in the housing bore. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification