Cerebral dilator
First Claim
Patent Images
1. A dilator assembly for creation of a bloodless opening comprising:
- (a) an outer needle having an open distal end, an open proximal end and a first aperture through which fluid may pass;
(b) an inner needle which is insertable into said outer needle, said inner needle having a closed distal end, a proximal end, and a second aperture alignable with said first aperture when said inner needle is fully inserted into said outer needle, said distal end of said inner needle forming a seal with the outer needle when fully inserted, and said proximal end of said inner needle having a means for connecting to a fluid source; and
(c) an expandable sac attached to said outer needle intermediate said proximal end and said distal end.
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Abstract
A surgical dilator for dilation of cerebral tissue, having an outer needle, an inner needle insertable into the outer needle and an expandable sac attached to the outer needle, which permits access to a tumor, cerebral ventricle or other tissue by dilating the cerebral tissue in its path and indicates when such tumor, ventricle or other tissue has been entered by the release of fluid through the outer needle. Also, a method of verifying entry into a tumor, ventricle or other tissue and creating a bloodless opening to such tumor, ventricle or other tissue in cerebral tissue utilizing the surgical dilator.
142 Citations
30 Claims
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1. A dilator assembly for creation of a bloodless opening comprising:
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(a) an outer needle having an open distal end, an open proximal end and a first aperture through which fluid may pass; (b) an inner needle which is insertable into said outer needle, said inner needle having a closed distal end, a proximal end, and a second aperture alignable with said first aperture when said inner needle is fully inserted into said outer needle, said distal end of said inner needle forming a seal with the outer needle when fully inserted, and said proximal end of said inner needle having a means for connecting to a fluid source; and (c) an expandable sac attached to said outer needle intermediate said proximal end and said distal end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for creating a bloodless opening in cerebral tissue comprising:
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(a) providing a dilator assembly comprising an outer needle having an open distal end, an open proximal end and a first aperture through which fluid may pass;
an inner needle which is insertable into said outer needle, said inner needle having a closed distal end, a proximal end, and a second aperture alignable with said first aperture when said inner needle is fully inserted into said outer needle, said distal end forming a seal with the outer needle when fully inserted, and said proximal end having a means for connecting to a fluid source; and
an expandable sac attached to said outer needle intermediate said proximal end and said distal end;(b) inserting into cerebral tissue said dilator assembly with said inner needle inserted into said outer needle and said expandable sac deflated; (c) removing said inner needle from said outer needle sufficient to permit drainage of fluid through the outer needle; (d) reinserting said inner needle into said outer needle with said first aperture and said second aperture in alignment; (e) passing an inflation fluid through said inner needle, second aperture and first aperture to inflate said expandable sac; (f) releasing said inflation fluid from said expandable sac deflating said sac; and (g) removing said dilator assembly from said cerebral tissue. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A method for determining entry of a dilator assembly into a brain tumor comprising:
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(a) providing a dilator assembly comprising an outer needle having an open distal end, an open proximal end and a first aperture through which fluid may pass;
an inner needle which is insertable into said outer needle, said inner needle having a closed distal end, a proximal end, and a second aperture alignable with said first aperture when said inner needle is fully inserted into said outer needle, said distal end forming a seal with the outer needle when fully inserted, and said proximal end having a means for connecting to a fluid source; and
an expandable sac attached to said outer needle intermediate said proximal end and said distal end;(b) inserting into cerebral tissue said dilator assembly with said inner needle inserted into said outer needle and said expandable sac deflated; and (c) removing said inner needle from said outer needle sufficient to permit drainage of fluid through the outer needle;
said drainage indicating entry into said tumor.
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30. A method for removing fluid from cerebral tissue comprising:
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(a) providing a dilator assembly comprising an outer needle having an open distal end, an open proximal end and a first aperture through which fluid may pass;
an inner needle which is insertable into said outer needle, said inner needle having a closed distal end, a proximal end, and a second aperture alignable with said first aperture when said inner needle is fully inserted into said outer needle, said distal end forming a seal with the outer needle when fully inserted, and said proximal end having a means for connecting to a fluid source; and
an expandable sac attached to said outer needle intermediate said proximal end and said distal end;(b) inserting into cerebral tissue said dilator assembly with said inner needle inserted into said outer needle and said expandable sac deflated; and (c) removing said inner needle from said outer needle sufficient to permit drainage of fluid through the outer needle.
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Specification