Bone cement injector
First Claim
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1. Apparatus for injecting bone cement for a cartridge in orthopedic surgery, comprising:
- a body;
means for supporting a bone cement containing cartridge on said body;
trigger means actuable for movement on said body;
ram means advanceable on said body in response to actuation of said trigger means for forcing bone cement from said cartridge to a surgical site;
means operatively interposed between said trigger means and ram means and actuable for changing, between a lower force value and a higher force value, the force applicable by said ram means to the cartridge in response to a given actuation of said trigger means, in which said force changing means comprises first and second ram advancing means alternatively selectable for applying a lower force and a higher force to said ram means, and switch means actuable to select between said first and second ram advancing means.
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Accused Products
Abstract
Apparatus for injecting bone cement from a cartridge in orthopedic surgery having a body and structure supporting a bone cement containing cartridge on the body. A trigger structure is actuable for movement on the body. Ram structure is advanceable on the body in response to actuation of the trigger structure for forcing bone cement from the cartridge toward a surgical site. Structure interposed between the trigger structure and ram structure is actuable for changing, between a lower force value and a higher force value, the force appliable by the ram to the cartridge in response to a given actuation of the trigger structure.
1384 Citations
25 Claims
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1. Apparatus for injecting bone cement for a cartridge in orthopedic surgery, comprising:
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a body; means for supporting a bone cement containing cartridge on said body; trigger means actuable for movement on said body; ram means advanceable on said body in response to actuation of said trigger means for forcing bone cement from said cartridge to a surgical site; means operatively interposed between said trigger means and ram means and actuable for changing, between a lower force value and a higher force value, the force applicable by said ram means to the cartridge in response to a given actuation of said trigger means, in which said force changing means comprises first and second ram advancing means alternatively selectable for applying a lower force and a higher force to said ram means, and switch means actuable to select between said first and second ram advancing means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for injecting bone cement from a cartridge in orthopedic surgery, comprising:
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a body; means for supporting a bone cement containing cartridge on said body; trigger means actuable for movement on said body; ram means advanceable on said body in response to actuation of said trigger means for forcing bone cement from said cartridge to a surgical site; means operatively interposed between said trigger means and ram means and actuable for changing, between a lower force value and a higher force value, the force applicable by said ram means to the cartridge in response to a given actuation of said trigger means, in which said ram means comprises an elongate rod advanceable towards the cartridge and having a series of rear facing teeth distributed longitudinally thereon, said trigger means having a head advanceable toward said cartridge, said interposed means comprising a low force pawl and a high force pawl pivotable on said head and extending up and forward into forward driving contact with said teeth for forwardly advancing said rod upon forward movement of said head. - View Dependent Claims (8, 9, 10, 11)
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12. Apparatus for injecting bone cement from a cartridge in orthopedic surgery, comprising:
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a body; means for supporting a bone cement containing a cartridge on said body; trigger means actuable for movement on said body; a rod advanceable on said body in response to actuation of said trigger means for forcing bone cement from said cartridge to a surgical site, said rod having a series of rear facing teeth thereon, said trigger means having a pivot axis, said trigger means having a head carrying said trigger means pivot axis; a low force pawl comprising a relatively short pawl pivotable on said head on an axis remote from said trigger means pivot axis and engaging said rod teeth at a relatively large acute angle; a high force pawl comprising a relatively long pawl pivoted on said head on an axis closer to said trigger means pivot axis and engaging said rod teeth at a relatively smaller acute angle, so as to provide a relatively shorter stroke and larger mechanical advantage to the high force pawl as compared to the low force pawl and so as to provide a larger ram force per increment of force on the trigger means from said high force pawl. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. Apparatus for injecting bone cement from a cartridge in orthopedic surgery, comprising:
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a body; a bone cement containing cartridge supportable on a forward portion of said body, said cartridge having a forward extending shell and a radially outward extending flange on a rear end portion thereof; trigger means actuable for movement on said body; ram means advanceable on said body for forcing bone cement from said cartridge to a surgical site; means operatively interposed between said trigger means and ram means and responsive to actuation of said trigger means for advancing said ram means; cartridge support means for removably fixing said cartridge in forward extending relation on said body ahead of said ram means, said cartridge support means having a radially opening recess for receiving said cartridge flange and guard flange means partly blocking the front end of said recess on three sides thereof to guard against forward escape of said cartridge flange from said recess while said ram means forces bone cement from said cartridge to a surgical site, said guard flange means being open on one side for receiving said shell thereinto during insertion of said cartridge flange in said recess, and resilient detent means operatively associated with said guard flange means near the open side thereof for resiliently blocking unintended escape of said cartridge from said cartridge support means. - View Dependent Claims (21)
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22. Apparatus for injecting bone cement from a cartridge in orthopedic surgery, comprising:
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a body; means for supporting a bone cement containing cartridge on said body; a trigger actuable for movement on said body;
a ram advanceable on said body in response to actuation of said trigger for forcing bone cement from said cartridge to a surgical site;first force applying means responsive to a preselected force on said trigger for applying a first force to said ram so as to inject an initial charge of cement into a surgical site at a first pressure; second force applying means responsive to the same preselected force on said trigger for applying a second and higher force to said ram so as to inject a smaller final charge of cement into such surgical site at a second pressure substantially higher than said first pressure; switch means actuable for substituting said second force applying means in place of said first force applying means. - View Dependent Claims (23)
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24. Apparatus for injecting bone cement from a cartridge in orthopedic surgery, comprising:
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a body; means for supporting a bone cement containing cartridge on said body; a trigger actuable for movement on said body; a ram advanceable on said body in response to actuation of said trigger for forcing bone cement from said cartridge to a surgical site; means operatively interposed between said trigger and ram and actuable for (1) first displacing a relative large quantity of cement at a relatively low pressure into said surgical site to mostly fill the surgical site upon completion thereof, and (2) secondly displacing a smaller final quantity of cement at a substantially higher pressure into said surgical site to complete the filling of the surgical site; said operatively interposed means comprising first and second coupling means alternatively interposed operatively between said trigger and ram for respectively carrying out said first and second displacing and substituting means actuable for substituting said first coupling means for said means coupling means.
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25. Apparatus for injecting bone cement from a cartridge in orthopedic surgery, comprising:
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a body; means for supporting a bone cement containing cartridge on said body; a trigger displaceable on said body; a ram advanceable on said body in response to actuation of said trigger for forcing bone cement from the cartridge to a surgical site; means operatively interposed between said trigger and ram and actuable for changing the length displacement of the ram, from a higher displacement range to a lower displacement range, to be effected by the same length of displacement of the trigger such that the displacement range of the ram can be changed without lengthening or shortening the displacement range of the trigger, said displacement changing means comprising first and second ram advancing means alternatively selectable for respectively displacing said ram a greater distance and a lesser distance in response to the same displacement of said trigger, and switch means actuable to select between said first and second ram advancing means.
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Specification