Uniform stress needle
View Patent ↗A linear surgical needle is provided having a body portion including a proximal end section; a central section; and a distal end section. The distal end section has a substantially parabolic configuration for producing a substantially uniform stress profile along a length thereof.
1. A surgical needle, comprising:
a proximal end section configured and adapted to secure a suture thereto;
a central section having a substantially uniform transverse cross-sectional profile; and
a distal end section having a substantially parabolic surface profile for producing a substantially uniform stress along a length thereof, the surface profile being defined by the following equation:
d =(((32 W )/(πσ))*( X n ))^(⅓)
where
d=measured diameter at location X n; ;
W=load normal to the needle;
X n =distance from a distal-most end of the needle; and
σ=chosen stress restraint,
wherein the central section has a cross-sectional profile selected from the group consisting of rectilinear, circular, triangular, I-beam, and ribbon shaped cross-sectional profiles.
2. The surgical needle of claim 1 , wherein the distal end section includes a distal tip having a substantially uniform taper.
3. The surgical needle of 2 , wherein the distal tip has a length which is substantially equal to a diameter of the central section of the needle.
4. The surgical needle of claim 2 , wherein the proximal end section is configured and adapted to secure a suture thereto.
5. A surgical needle, comprising:
a proximal end section configured and adapted to secure a suture thereto;
a central section having a substantially uniform transverse cross-sectional profile; and
a distal end section having a substantially parabolic surface profile for producing a substantially uniform stress along a length thereof, the distal end section having a cross-section defining a circle, the surface profile being defined by the following equation:
d =(((32 W )/(πσ))*( X n ))^(⅓),
where
d=measured diameter at location X n; ;
W=load normal to the needle;
X n =distance from a distal-most end of the needle; and
σ=chosen stress restraint,
wherein the central section has a cross-sectional profile selected from the group consisting of rectilinear, circular, triangular, I-beam, and ribbon shaped cross-sectional profiles.