Retractable disposable tip reusable trocar obturator
First Claim
1. A retractable and reusable trocar obturator having a removable tip, comprising:
- a trocar sheath having a proximal end and a distal end;
a dilating obturator, said dilating obturator fitting in close relationship within said trocar sheath, said dilating obturator defining a narrow, central, longitudinal bore with proximal and distal apertures, said dilating obturator having a smooth conical tip centered about said distal aperture, said conical tip extending from said distal end of said trocar sheath, said conical tip smoothly mediating a transition between said distal aperture and said distal end of said trocar sheath;
a manually operable narrow stylet, said narrow stylet fitting in close relationship with said dilating obturator, said stylet having an exceedingly sharp, cutting tip; and
biasing means for urging said narrow stylet away from said distal end of said dilating obturator to retract said narrow stylet within said dilating obturator, said biasing means coupled to said narrow stylet;
wherebysaid narrow stylet fits into said dilating obturator and said dilating obturator fits into said trocar sheath to provide the trocar obturator, said cutting tip of said narrow stylet exposed for puncturing a patient'"'"'s body cavity when said urging of said biasing means is overcome by manual pressure from a surgeon'"'"'s hand, said cutting tip then made available for puncturing a body cavity of said patient so that a resulting wound may be dilated by said dilating obturator to ultimately allow said distal end of said trocar sheath to enter said body cavity with minimal patient injury, said cutting tip immediately retracting into said dilating obturator when said manual pressure of said surgeon'"'"'s hand is removed.
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Accused Products
Abstract
A manual dilating trocar uses an automatically retracting stylet. The stylet is threaded through a dilating obturator which is, in turn, inserted into a trocar sheath. A spring near the handle of the stylet serves to urge the stylet cutting tip into a retracted position so that it can be held within the dilating tip of the dilating obturator. When a surgeon seeks to pierce a body cavity so as to perform laparoscopic surgery or the like, the handle is engaged to overcome the bias of the spring so that the stylet'"'"'s cutting tip is exposed. Upon piercing of the exterior body-cavity layer, the stylet may be withdrawn to ensure that no underlying organs or tissue are damaged by the sharp stylet tip. Once the dilation of the initial stylet wound has been completed and the trocar sheath has been introduced into the body cavity, the dilating obturator may also be removed from within the trocar sheath in order to provide a channel into the body cavity. In an alternative embodiment, the stylet may be spring biased to expose the cutting tip, and a lock pin may be used so that energy stored in the spring can be brought to bear upon the stylet and to deliver a sharp cutting thrust of the stylet tip against any tough or obstructive tissue.
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Citations
15 Claims
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1. A retractable and reusable trocar obturator having a removable tip, comprising:
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a trocar sheath having a proximal end and a distal end; a dilating obturator, said dilating obturator fitting in close relationship within said trocar sheath, said dilating obturator defining a narrow, central, longitudinal bore with proximal and distal apertures, said dilating obturator having a smooth conical tip centered about said distal aperture, said conical tip extending from said distal end of said trocar sheath, said conical tip smoothly mediating a transition between said distal aperture and said distal end of said trocar sheath; a manually operable narrow stylet, said narrow stylet fitting in close relationship with said dilating obturator, said stylet having an exceedingly sharp, cutting tip; and biasing means for urging said narrow stylet away from said distal end of said dilating obturator to retract said narrow stylet within said dilating obturator, said biasing means coupled to said narrow stylet;
wherebysaid narrow stylet fits into said dilating obturator and said dilating obturator fits into said trocar sheath to provide the trocar obturator, said cutting tip of said narrow stylet exposed for puncturing a patient'"'"'s body cavity when said urging of said biasing means is overcome by manual pressure from a surgeon'"'"'s hand, said cutting tip then made available for puncturing a body cavity of said patient so that a resulting wound may be dilated by said dilating obturator to ultimately allow said distal end of said trocar sheath to enter said body cavity with minimal patient injury, said cutting tip immediately retracting into said dilating obturator when said manual pressure of said surgeon'"'"'s hand is removed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification