Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
Afistula needle having a cylindrical metal inner portion fitting coaxially within a cylindrical plastics outer portion, an end part of which fits snugly around the inner portion, the inner diameter of the next adjacent part of the outer portion being greater than the outer diameter of the inner portion whereby concentric flow passages are defined, and a hole or holes through the outer portion adjacent the contact between inner and outer portions.
Claim 2
Dependent Claim
72 words
Afistula needle having a cylindrical metal inner portion fitting coaxially within a cylindrical plastics outer portion, an end part of which fits snugly around the inner portion, the inner diameter of the next adjacent part of the outer portion being greater than the outer diameter of the inner portion whereby concentric flow passages are defined, and a hole or holes through the outer portion adjacent the contact between inner and outer portions.
Claim 3
Dependent Claim
41 words
A fistula needle according to claim 1, wherein at the end of the outer portion remote from the hole or holes there is a body having two branches, into one of which the other end part of the inner portion extends.
Claim 4
Dependent Claim
33 words
Afistula needle according to claim 2, wherein the inner diameter of the branch into which the other end part of the inner portion extends is greater than the outer diameter of the latter.
Claim 5
Dependent Claim
80 words
A fistula needle according to claim 2 or claim 3, wherein the branch into which the other end part of the inner portion extends has a tube within it for holding that end part of the inner portion in position, the outer surface of the tube being a snug fit with the inner surface of the branch and the outer surface of that end part of the inner portion being a snug fit with the inner surface of the tube.
Claim 6
Dependent Claim
15 words
A fistula needle according to claim 4 wherein the tube is made of plastics material.
Claim 7
Dependent Claim
65 words
A fistula needle according to claim 2, wherein the outer diameter of at least part of the other end part of the inner portion is greater than the outer diameter of the main part of the inner portion, and the outer surface of the end part of the inner portion having an increased diameter is a snug fit with the inner surface of the branch.
Claim 8
Dependent Claim
30 words
A fistula needle according to any one of claims 2 to 6, wherein the branched body is made of plastics material and is formed in one with the outer portion.
Claim 9
Dependent Claim
32 words
A fistula needle according to any one of the preceding claims wherein at the said one end
surface of the outer portion merges smoothly into the outer surface of the inner portion.
Claim 10
Dependent Claim
23 words
Fistula needles substantially as herein described, with reference to and as illustrated in Figs.1 to 3 and Fig. 4 of the accompanying drawings.
Claim 11
Dependent Claim
23 words
Fistula needles substantially as herein described, with reference to and as illustrated in Figs.1 to 3 and Fig. 4 of the accompanying drawings.