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; and
an obturator having a distal end configured to engage the distal end of the coil spring such that rotation of the obturator is effective to rotate the distal end of the coil spring relative to the housing.
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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.
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Citations
11 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; and an obturator having a distal end configured to engage the distal end of the coil spring such that rotation of the obturator is effective to rotate the distal end of the coil spring relative to the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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; wherein releasing the coil spring comprises releasing a distal end of the coil spring from an obturator engaging the coil spring such that the distal end of the coil spring rotates relative to a proximal end of the coil spring and relative to a housing coupled to the proximal end of the coil spring. - View Dependent Claims (10)
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11. 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; wherein releasing the coil spring includes detaching an obturator from a housing coupled to a proximal end of the cannula to release a distal end of the coil spring from a distal end of the obturator.
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Specification