Assembly for adminstering IV solution
First Claim
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1. An assembly for administering an IV solution to a patient which comprises:
- (a) a needle; and
(b) a cannula surrounding the needle, the walls of which cannula are of a multiple phase polymeric composition comprising;
(i) a first phase which is continuous and comprises a substantially non-hydrophilic polymeric component capable of absorbing no more than about 30% water; and
(ii) a second phase which comprises a hydrophilic polymeric component capable of absorbing at least 50% water;
wherein said cannula is capable of absorbing water to an extent that it softens with a softening ratio of at least about 2;
1 and/or swells with a swelling ratio of at least about 1.3;
1; and
when substantially completely hydrated, has a tensile energy to break of at least about 700 N-cm/cm3 and a 2.5% Secant modulus of less than about 7,000 N/cm2.
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Abstract
An article, suitable for use as a body implant, is made from a novel composition comprising a multiple phase polymer composition comprising:
(a) a first phase which comprises a substantially nonhydrophilic polymeric component; and
(b) a second phase which comprises a hydrophilic polymeric component;
said composition (i) being capable of absorbing water to an extent that it softens with a softening ratio of at least about 2:1 and/or swells with a swelling ratio of at least about 1.3:1; and (ii) when substantially completely hydrated has an energy to break of at least about 700 N-cm/cm3 and a 2.5% Secant modulus of less than about 7,000 N/cm2.
223 Citations
14 Claims
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1. An assembly for administering an IV solution to a patient which comprises:
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(a) a needle; and (b) a cannula surrounding the needle, the walls of which cannula are of a multiple phase polymeric composition comprising; (i) a first phase which is continuous and comprises a substantially non-hydrophilic polymeric component capable of absorbing no more than about 30% water; and (ii) a second phase which comprises a hydrophilic polymeric component capable of absorbing at least 50% water; wherein said cannula is capable of absorbing water to an extent that it softens with a softening ratio of at least about 2;
1 and/or swells with a swelling ratio of at least about 1.3;
1; and
when substantially completely hydrated, has a tensile energy to break of at least about 700 N-cm/cm3 and a 2.5% Secant modulus of less than about 7,000 N/cm2. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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2. An assembly for administering an IV solution to a patient which comprises:
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(a) a needle; and (b) a tubular cannula positioned within the needle, the walls of which cannula are of a multiple phase polymeric composition comprising; (i) a first phase which is continuous and comprises a substantially non-hydrophilic polymeric component capable of absorbing no more than about 30% water; and (ii) a second phase which comprises hydrophilic polymeric component capable of absorbing at least 50% water; wherein said cannula is capable of absorbing water to an extent that it softens with a softening ratio of at least about 2;
1 and/or swells with a swelling ratio of at least about 1.3;
1; and
when substantially completely hydrated, has a tensile energy to break of at least about 700 N-cm/cm3 and a 2.5% Secant modulus of less than about 7,000 N/cm2. - View Dependent Claims (3, 4, 5, 6)
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Specification