Instrument for the penetration of body tissue with cutting and viewing of body structure
First Claim
1. An instrument for the penetration of body tissue comprising:
- a rigid shaft having a distal end,a tissue contacting element at the distal end of said shaft shaped to enlarge an opening in body tissue as the tissue contacting element and said shaft are advanced, said tissue contacting element having a distal end, and at least part of said tissue contacting element being transparent to permit viewing of body tissue therethrough, andan advancing element at said tissue contacting element, said advancing element having a cutting edge to penetrate the body tissue and extending from adjacent the distal end of said tissue contacting element towards said shaft.
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Accused Products
Abstract
An instrument is described for the penetration of body tissue with a hollow shaft, the point of which is formed as a conical, beveled, or tapered window. An optic with a lighting unit is brought to the point through the hollow shaft. The optic ends at an axial distance behind the summit of the point. An advancing element having a cutting edge extends along the point. The instrument can be inserted while viewing the structure to be penetrated. In so doing, the structure adjacent the point can be observed over substantially the entire surface area thereof. Preferably, a second optic is run to the summit of the point, which in addition enables improved observation of the area lying directly in front of the point.
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Citations
25 Claims
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1. An instrument for the penetration of body tissue comprising:
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a rigid shaft having a distal end, a tissue contacting element at the distal end of said shaft shaped to enlarge an opening in body tissue as the tissue contacting element and said shaft are advanced, said tissue contacting element having a distal end, and at least part of said tissue contacting element being transparent to permit viewing of body tissue therethrough, and an advancing element at said tissue contacting element, said advancing element having a cutting edge to penetrate the body tissue and extending from adjacent the distal end of said tissue contacting element towards said shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An instrument for the penetration of body tissue comprising:
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a rigid elongated shaft having a distal end, a tissue contacting element at the distal end of said shaft shaped to penetrate body tissue to enlarge an opening therein as the tissue contacting element and said shaft are advanced, said tissue contacting element having a distal end, and said tissue contacting element being substantially entirely transparent to permit viewing of body tissue therethrough, an advancing element at said tissue contacting element, said advancing element having a cutting edge lying outwardly of said tissue contacting element and extending from adjacent to the distal end thereof towards said shaft, said tissue contacting element having a proximal end at and adjacent to the distal end of said shaft, said proximal end of said tissue contacting element being of substantially the same lateral size and shape as the distal end of said shaft. - View Dependent Claims (12)
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13. An instrument for penetration of body tissue comprising:
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an elongated shaft having a longitudinal axis and a distal end, a window at the distal end of said shaft, said window having a longitudinal axis and a distal end portion spaced from said distal end of said shaft, at least the distal end portion of said window being transparent, said window having a surface configuration substantially symmetrical about the longitudinal axis thereof, said longitudinal axis of said window being in alignment with the longitudinal axis of said shaft, and at least one cutting element having a cutting edge to penetrate the body tissue and extending from adjacent the distal end portion of said window towards said shaft, whereby light may be transmitted through the transparent portion of said window and said cutting element will effect the advance of said instrument into said body tissue. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An instrument for penetration of body tissue comprising:
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a rigid elongated shaft having a longitudinal axis and a distal end, a transparent window at the distal end of said shaft, said window having a longitudinal axis and a distal end portion spaced from said distal end of said shaft, said transparent window having a surface configuration substantially symmetrical about the longitudinal axis thereof, said longitudinal axis of said transparent window being in alignment with the longitudinal axis of said shaft, at least one cutting element having a cutting edge to penetrate the body tissue and extending from adjacent the distal end of said transparent window towards said shaft, said window having a proximal end at and adjacent to the distal end of said shaft, said proximal end of said window being of substantially the same lateral size and shape as the distal end of said shaft, whereby light may be transmitted through said transparent window and said cutting element will effect the advance of said instrument into said body tissue.
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Specification