Circular fastener cartridges for applying radially expandable fastener lines

1. A fastener cartridge for use with a circular fastener, the fastener cartridge comprising:

(a) a circular deck extending radially outward from an interior dimensioned to slidably house a circular knife, the circular deck comprising:

(i) a first circular reference line having a first radius,

(ii) a second circular reference line having a second radius greater than the first radius, and,

(iii) a third circular reference line having a third radius that is smaller than the first radius;

(b) a first radial array of fastener cavities positioned intermediate said first circular reference line and said second circular reference line, wherein each fastener cavity of the first radial array of fastener cavities is dimensioned to house a respective fastener, wherein each fastener cavity of the first radial array of fastener cavities comprises a first end and a second end, wherein said first ends and said second ends are aligned with one of said first circular reference line and said second circular reference line, wherein each said fastener cavity of the first radial array of fastener cavities defines an axis extending from said first end to said second end, and wherein said axes form a circular zigzag pattern around the circular deck; and

(c) a second radial array of fastener cavities extending along the third circular reference line, wherein each fastener cavity of the second radial array of fastener cavities is dimensioned to house a fastener.

2. The fastener cartridge of claim 1 , wherein said first radial array of fastener cavities are positioned to form radially-expandable fastener arrays.

3. A staple cartridge for use with a surgical stapler, the staple cartridge comprising:

(a) an annular deck extending radially outward from an interior dimensioned to contain a circular blade, the annular deck comprising:

(i) a first reference curve axis having a first radius

(ii) a second reference curse axis having a second radius greater than the first radius,

(iii) a third reference curve having a third radius that is smaller than each of the first radius and the second radius;

(b) a first array of staple cavities positioned intermediate said first reference curve and said second reference curve, wherein each staple cavity of the first array of staple cavities house a respective staple, wherein each staple cavity of the first array of staple cavities comprises a first end and a second end, wherein said first ends and said second ends are aligned with one of said first reference curve and said second reference curve, wherein each said staple cavity of the first array of staple cavities defines an axis extending from said first end to said second end, and wherein said axes of the first array of staple cavities form a zigzag pattern around said annular deck; and

(c) a second array of staple cavities extending along the third reference curve, wherein each staple cavity of the second array of staple cavities house a respective staple.

4. The staple cartridge of claim 3 , wherein said first array of staple cavities are positioned to form radially-expandable staple arrays.

5. The staple cartridge of claim 3 , wherein said axes extending from said first end to said second end of each said staple cavity are secants to said first reference curve said second reference curve.

6. A stapler, comprising:

(a) a shaft defining a shaft axis;

(b) an anvil; and

(c) a staple cartridge opposing said anvil, said staple cartridge comprising:

(i) a circular deck dimensioned to slidably house a circular blade, the circular deck comprising:

(A) first circular reference line having a first radius; and

(B) a second circular reference line axis having a second radius greater than the first radius, and

(C) a third circular reference line having a third radius that is smaller than both the first radius and the second radius,

(ii) a first array of staple cavities positioned intermediate said first circular reference line and said second circular reference line, wherein each staple cavity of the first array of staple cavities houses a respective staple, wherein each staple cavity of the first array of staple cavities comprises a first end and a second end, wherein said first ends and said second ends are aligned with one of said first circular reference line and said second circular reference line, wherein each said staple cavity of the first array of staple cavities defines an axis extending from said first end to said second end, and wherein said axes of the first array of staple cavities form a zigzag pattern around said deck; and

(iii) a second array of staple cavities disposed on the third circular reference line, wherein each staple cavity of the second array of staple cavities houses a respective staple, wherein each staple cavity of the second array of staple cavities forms a triangular staple pattern with a pair of adjacent staple cavities of the first array of staple cavities.

7. The stapler of claim 6 , wherein said array of staple cavities are positioned to form radially-expandable staple arrays.

8. The stapler of claim 6 , wherein said axes are secants to said first circular reference line and said circular reference line.

9. The stapler of claim 6 , further comprising a knife, wherein said circular deck comprises an inner edge defining an inner edge axis having an inner radius, and wherein said knife is configured to translate to cut tissue clamped between said deck and said anvil.

10. A fastener cartridge, comprising:

(a) a deck, comprising:

(i) an inner circular reference line having a first radius; and

(ii) an outer circular reference line having a second radius greater than the first radius;

(b) a first array of fastener cavities positioned intermediate said inner circular reference line and said outer circular reference line, wherein each fastener cavity of the first array of fastener cavities houses a respective fastener, wherein each fastener cavity of the first array of fastener cavities comprises a first end and a second end, wherein said first ends and said second ends are aligned with one of said inner axis and said outer axis, and wherein said first array of fastener cavities forms a circular zigzag pattern between said inner axis and said outer axis; and

(c) a second array of fastener cavities disposed in a circular pattern having a third circular reference line smaller than the inner circular reference line, wherein each fastener cavity of the second array of fastener cavities houses a respective fastener, wherein each fastener cavity of the second array of fastener cavities forms a triangular shape with a pair of adjacent fastener cavities of the first array of the fastener cavities.