Bone cement delivery apparatus and hand-held fluent material dispensing apparatus

A handheld fluent material dispensing apparatus, comprising:

• a body for supporting a fluent dispensing container;
• a handle depending from the body;
• a trigger carried by the body for pivotal movement relative to the handle;
• a plunger slidably carried by the body;
• and
• a driving pawl pivotally carried by the trigger at positionally adjustable locations along the trigger to vary a fulcrum distance of the trigger between a pivot point of the trigger and a pivot point of the pawl, the pawl configured to engage with the plunger, the driving pawl being pivotally carried by the trigger at continuously adjustable locations along the trigger so as to vary mechanical advantage between the trigger and the pawl in order to vary force supplied to the plunger by the pawl;
• wherein movement of the trigger imparts coaction between the pawl and the plunger to move the plunger relative to the body and cause dispensing of fluent material from the container.

A surgical cement extrusion gun, comprising:

• a frame for carrying a container having surgical bone cement;
• a piston communicating with the container and carried for axial translation by the frame to urge bone cement from the container;
• a trigger for advancing the piston to dispense bone cement from the container;
• and
• a positionally adjustable driving pawl interposed between the piston and the trigger and configured to adjust mechanical advantage between the piston and the trigger so as to vary delivery force imparted to the surgical bone cement within the dispensing container, and
• the trigger includes a shaft carried for extension and retraction within the trigger, the shaft comprising an eyelet for pivotally receiving the driving pawl, the driving pawl is carried for rotation by the eyelet via an eyelet pin, and axial extension and retraction of the shaft within the trigger positionally adjusts a pivot point-for the driving pawl relative to the trigger.

A bone cement delivery apparatus, comprising:

• a body configured to support a bone cement dispensing container;
• a ram carried by the body and configured to advance relative to the body to urge bone cement from the dispensing container;
• a trigger mechanism on the body and configured for actuation to advance the ram;
• and
• a pawl assembly carried by the trigger mechanism to engage the ram, the pawl assembly comprising a pawl carried by the trigger mechanism infinitely adjustable in relation with the trigger mechanism between a relatively low force position and a relatively high force position;
• the trigger mechanism includes a trigger pivotally carried by the body about a pivot axis, the pawl assembly comprising a slidably adjustable pivot point for the pawl;
• and
• the slidably adjustable pivot point includes an elongate slot within the trigger extending generally radially from the pivot point and the pawl includes a traveling eyelet pin carried by the pawl, received within the slot, and being movable to infinitely adjustable positions along the slot.

A handheld fluent material dispensing apparatus, comprising:

• a body for supporting a fluent dispensing container;
• a handle depending from the body;
• a trigger carried by the body for pivotal movement relative to the handle;
• a plunger slidably carried by the body;
• a driving pawl pivotally carried by the trigger at positionally adjustable locations along the trigger to vary a fulcrum distance of the trigger between a pivot point of the trigger and a pivot point of the pawl, the pawl configured to engage with the plunger, and
• a pair of opposed lever pins carried in axially coincident relation by the body and cooperating with the trigger to provide a pivot mechanism for rotatably supporting the trigger from the body for movement relative to the handle;
• the trigger including an adjustment shaft carried for coaxial movement within the trigger, the shaft comprising an eyelet for receiving an eyelet pin, wherein the pawl is carried for rotation by the eyelet pin relative to the eyelet;
• and
• the shaft including a pair of elongate slots extending axially of the shaft, opposite one another, the slots being configured to receive the eyelet pin:
• so as to provide an adjustable position pivot point for the pawl along the trigger,
• wherein movement of the trigger imparts coaction between the pawl and the plunger to move the plunger relative to the body and cause dispensing of fluent material from the container.

A handheld fluent material dispensing apparatus, comprising:

• a body for supporting a fluent dispensing container;
• a handle depending from the body;
• a trigger carried by the body for pivotal movement relative to the handle;
• a plunger slidably carried by the body;
• and
• a driving pawl pivotally carried by the trigger at positionally adjustable locations along the trigger to vary a fulcrum distance of the trigger between a pivot point of the trigger and a pivot point of the pawl, the pawl configured to engage with the plunger, and
• a pair of opposed lever pins carried in axially coincident relation by the body and cooperating with the trigger to provide a pivot mechanism for rotatably supporting the trigger from the body for movement relative to the handle,
• wherein movement of the trigger imparts coaction between the pawl and the plunger to move the plunger relative to the body and cause dispensing of fluent material from the container.

A handheld fluent material dispensing apparatus, comprising:

• a body for supporting a fluent dispensing container;
• a handle depending from the body;
• a trigger carried by the body for pivotal movement relative to the handle;
• a plunger slidably carried by the body;
• a driving pawl pivotally carried by the trigger at positionally adjustable locations along the trigger to vary a fulcrum distance of the trigger between a pivot point of the trigger and a pivot point of the pawl, the pawl configured to engage with the plunger,
• a shaft coaxially located within the trigger for extension and retraction relative to the trigger and operative to positionally adjust location of the pivot point for the driving pawl;
• and
• the driving pawl includes a traveling eyelet pin, the handle includes at least one elongate slot configured to receive the traveling eyelet pin slidably therein, and the shaft is coupled in rotatable relation with the traveling eyelet pin to movably position the pivot point for the driving pawl in relation to the handle as the shaft is extended and retracted,
• wherein movement of the trigger imparts coaction between the pawl and the plunger to move the plunger relative to the body and cause dispensing of fluent material from the container.