INVERTED CONICAL EXPANDABLE RETRACTOR WITH COIL SPRING
First Claim
1. An adjustable access device, comprising:
- a housing;
an expandable cannula extending distally from the housing, the expandable cannula including a coil spring having a proximal end coupled to the housing and a distal end configured to rotate relative to the housing to adjust a diameter of the cannula such that the coil spring is effective to move the expandable cannula between an insertion configuration, in which the cannula has a substantially constant outer diameter between a proximal end and a distal end, and an expanded configuration, in which the diameter of the cannula increases from the proximal end of the cannula to the distal end of the cannula.
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0 Petitions
Accused Products
Abstract
Access devices and related methods are disclosed that generally involve flexible or adjustable cannulas that have a substantially cylindrical insertion configuration and a substantially conical expanded configuration. Various methods and features are provided for transitioning the cannula from the insertion configuration to the expanded configuration while the access device is inserted through tissue to form a conical opening through the tissue. Examples include cables, biasing elements, retaining elements, bimodal rings, and coil springs. The devices and methods disclosed herein can allow for improved retention of the access device, improved angulation of instruments passed through the access device, and can increase the integrity of a seal formed between the access device and surrounding tissue.
130 Citations
14 Claims
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1. An adjustable access device, comprising:
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a housing; an expandable cannula extending distally from the housing, the expandable cannula including a coil spring having a proximal end coupled to the housing and a distal end configured to rotate relative to the housing to adjust a diameter of the cannula such that the coil spring is effective to move the expandable cannula between an insertion configuration, in which the cannula has a substantially constant outer diameter between a proximal end and a distal end, and an expanded configuration, in which the diameter of the cannula increases from the proximal end of the cannula to the distal end of the cannula. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for accessing a surgical site, comprising:
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inserting a cannula of a surgical access device through a tissue wall; releasing a coil spring disposed within the cannula such that the coil spring radially expands to cause the cannula to radially expand into a conical configuration thereby forming a conical opening through the tissue wall. - View Dependent Claims (11, 12, 13, 14)
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Specification