A device prepares leaflets for cardiovascular valve reconstruction from a pericardial tissue sheet harvested from a patient. A cutter is adapted to cut a predetermined pattern having a selected leaflet size. A tissue marker automatically aligned with the predetermined cutting pattern is configured to mark suture positions on the leaflet in response to placement of the cutter. Cutting of a leaflet from the tissue sheet and marking of suture positions on the leaflet are obtained concurrently. A set of such devices spanning a variety of leaflet sizes may be provided in a kit that results in an ability to quickly obtain a properly sized and marked leaflet for reconstruction.

A hand-held knockout driver includes a main housing having a handle portion, a motor positioned within the main housing, a pump assembly driven by the motor, and a secondary housing coupled to the main housing and defining a bore therein. The hand-held knockout driver also includes a working piston moveable within the bore from a rest position to an actuated position to define a piston throw distance therebetween. The hand-held knockout driver also includes a draw stud coupled to the working piston, a die coupled to the secondary housing, and a punch coupled to the draw stud opposite the working piston for movement therewith relative to the die. The die has a depth greater than the piston throw distance.

An apparatus for creating holes in a workpiece includes a knockout punch tool having a movable piston. The apparatus also includes a draw stud assembly having a connector attachable to the movable piston, a draw stud, and a quick connect mechanism including mating first and second thread segments on the connector and the draw stud, respectively. The connector and the draw stud are movable between a first relative orientation where the mating first and second thread segments are misaligned to permit axial movement between the connector and the draw stud, and a second relative orientation where the mating first and second thread segments are aligned and engaged to inhibit axial movement between the connector and the draw stud.

A punch according to some embodiments of the disclosure includes a body having a punching edge and a wall forming a passageway therethrough, the wall having a multi-start thread formed thereon, and a draw stud according to some embodiments of the disclosure includes an elongated cylinder having a multi-start thread thereon which is configured to be coupled to the multi-start thread of the punch. The number of starts provided on the punch corresponds to the number of starts provided on the draw stud. The multi-start thread on the punch is engaged with the multi-start thread on the draw stud in use. A method using same to punch a hole in sheet metal is also provided.

A punch according to some embodiments of the disclosure includes a body having a punching edge and a wall forming a passageway therethrough, the wall having a multi-start thread formed thereon, and a draw stud according to some embodiments of the disclosure includes an elongated cylinder having a multi-start thread thereon which is configured to be coupled to the multi-start thread of the punch. The number of starts provided on the punch corresponds to the number of starts provided on the draw stud. The multi-start thread on the punch is engaged with the multi-start thread on the draw stud in use. A method using same to punch a hole in sheet metal is also provided.

A hand-held knockout driver includes a main housing having a handle portion, a motor positioned within the main housing, a pump assembly driven by the motor, and a secondary housing coupled to the main housing and defining a bore therein. The hand-held knockout driver also includes a working piston moveable within the bore from a rest position to an actuated position to define a piston throw distance therebetween. The hand-held knockout driver also includes a draw stud coupled to the working piston, a die coupled to the secondary housing, and a punch coupled to the draw stud opposite the working piston for movement therewith relative to the die. The die has a depth greater than the piston throw distance.

A film cutting apparatus includes: a punch plate including a first punch protruded on an upper surface and a second punch protruded on a lower surface; a first die plate having a first hole corresponding to the first punch, the first die plate providing a surface on which a film is provided; a second die plate having a second hole corresponding to the second punch, the second die plate providing a surface on which a film is provided; at least two guide bars penetrating the first die plate and the punch plate and fixed to the second die plate; a first elastic member between the first die plate and the punch plate; a second elastic member between the punch plate and the second die plate; and an elevator configured to press the first die plate.

An assembly includes a punch and a clamping assembly. The punch includes a body having a front end and a rear end. The front end has a cutting edge. A passageway extends through the body and a counterbore is provided proximate to a second end of the body. The clamping assembly includes first and second jaws pivotally attached to each other. Each jaw includes a main body having a nose extending from a front surface thereof. The nose has an outer surface which has a diameter which is smaller than the outer diameter of the main body. When the clamping assembly is mated with the punch, the noses seat within the counterbore, and the front surfaces of the main bodies engage against the rear end of the body of the punch.

An apparatus for creating holes in a workpiece includes a knockout punch tool having a movable piston. The apparatus also includes a draw stud assembly having a connector attachable to the movable piston, a draw stud, and a quick connect mechanism including mating first and second thread segments on the connector and the draw stud, respectively. The connector and the draw stud are movable between a first relative orientation where the mating first and second thread segments are misaligned to permit axial movement between the connector and the draw stud, and a second relative orientation where the mating first and second thread segments are aligned and engaged to inhibit axial movement between the connector and the draw stud.

A film cutting apparatus includes: a punch plate including a first punch protruded on an upper surface and a second punch protruded on a lower surface; a first die plate having a first hole corresponding to the first punch, the first die plate providing a surface on which a film is provided; a second die plate having a second hole corresponding to the second punch, the second die plate providing a surface on which a film is provided; at least two guide bars penetrating the first die plate and the punch plate and fixed to the second die plate; a first elastic member between the first die plate and the punch plate; a second elastic member between the punch plate and the second die plate; and an elevator configured to press the first die plate.