WO1995001129A1 - A suture needle - Google Patents

A suture needle Download PDF

Info

Publication number
WO1995001129A1
WO1995001129A1 PCT/US1994/004808 US9404808W WO9501129A1 WO 1995001129 A1 WO1995001129 A1 WO 1995001129A1 US 9404808 W US9404808 W US 9404808W WO 9501129 A1 WO9501129 A1 WO 9501129A1
Authority
WO
WIPO (PCT)
Prior art keywords
flat surfaces
suture needle
tip portion
needle according
needle
Prior art date
Application number
PCT/US1994/004808
Other languages
French (fr)
Inventor
James D. Silverman
Original Assignee
W.L. Gore & Associates, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by W.L. Gore & Associates, Inc. filed Critical W.L. Gore & Associates, Inc.
Priority to AU71995/94A priority Critical patent/AU7199594A/en
Publication of WO1995001129A1 publication Critical patent/WO1995001129A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
    • A61B17/06—Needles ; Sutures; Needle-suture combinations; Holders or packages for needles or suture materials
    • A61B17/06066—Needles, e.g. needle tip configurations
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/0084—Material properties low friction
    • A61B2017/00849—Material properties low friction with respect to tissue, e.g. hollow organs

Definitions

  • the present invention relates to the field of suture needles.
  • Suture needles with cutting edges are conventionally made with tip portions having at least two substantially flat surfaces with a cutting edge disposed between the at least two flat surfaces.
  • the flat surfaces are at a slight angle with respect to the longitudinal axis of the needle; these surfaces converge to form the point of the needle.
  • a common problem with needles of this type is burring or bending of the point of the needle because of insufficient metal at the point to resist the stresses imposed on the point during use.
  • U.S. Patent 3,094,123 to Kurtz attempts to address these problems by removing the point of a cutting needle by grinding it away into an arc-like shape with the arc substantially perpendicularly intersecting the longitudinal centerline of the needle. This solution strengthens the tip of the needle but compromises the piercing effectiveness of the needle.
  • U.S. Patent 3,636,955, also to Kurtz proposes an alternative solution by describing a point formed by grinding away the needle tip to form a single planar surface that the inventor calls a chisel-type cutting edge. The planar surface is preferably 45° with respect to the longitudinal centerline of the needle.
  • U.S. Patent 4,128,351 also to Kurtz describes a similar solution.
  • Patent 4,513,747 to Smith proposes a similar solution wherein each flat surface of the tip portion is ground away at a greater angle with respect to the needle centerline than the angle formed by the remainder of the flat surface. This method thus requires an additional grinding step for each flat surface. If four flat surfaces are used, it does not avoid the manufacturing difficulty of achieving a common intersection point with the new tip surfaces.
  • the present invention is a surgical needle having, in sequence, a shaft portion, a tip portion, a conical point portion and a point.
  • the needle has a longitudinal centerline.
  • the shaft portion constitutes most of the length of the needle and is intended primarily to provide a useful gripping surface by which the needle may be grasped by a conventional needle driver.
  • the shaft portion is typically of rounded cross section although other cross sections such as square or triangular are possible.
  • the shaft portion may be cylindrical or tapered along its length, and may also be either straight or curved along its length wherein the longitudinal centerline is consequently also straight or curved.
  • the tip portion comprises at least two flat surfaces and preferably has a cutting edge disposed between the flat surfaces.
  • the tip portion may, for example, have as many as five flat surfaces and five cutting edges.
  • Each flat surface lies in a plane that intersects the longitudinal centerline at a plane intersection angle.
  • the conical point portion is of substantially round cross section adjacent to the point and forms a cone angle defined as the angle between a plane tangent to the surface of the conical point portion and the longitudinal centerline. The cone angle is greater than the plane intersection angle.
  • the conical point portion of the surgical needle of the present invention achieves a strong, burr-resistant point offering both good strength and good piercing characteristics with corresponding low penetration forces.
  • the strength results from the cone angle being greater than the plane intersection angle, and also from the symmetric, round cross section of the conical point portion adjacent to the actual point. These two factors provide an increased cross sectional area adjacent to the point, thereby providing a substantial strength increase over conventional, prior art needles.
  • the use of a point having a symmetrical, round cross section provides for the greatest strength and resistance to burring or bending of the tip.
  • the conical point portion is simple to manufacture because of its symmetry. It may be made, for example, by grinding while rotating the needle with respect to the grinding surface. The conical point portion also reduces the need for four or more flat surfaces of the tip portion to be aligned to intersect at a common point.
  • the conical point portion may also be made to have a generally parabolic shape having a curved rather than straight profile.
  • the flat surfaces of the tip portion may also be made concave by the use of hollow grinding techniques.
  • Flat surfaces herein include concave, hollow ground surfaces as well as truly flat surfaces.
  • the plane should intersect with the edges of the concave surface.
  • the use of a conical point portion also allows for the use of a smaller plane intersection angle, which in turn further reduces penetration forces during use.
  • a suture may be affixed to the end of the needle opposite the point by various methods known in the art.
  • Figure 1A describes a side or profile view of the suture needle of the present invention.
  • Figure IB describes a cross section of a conical point portion having a substantially rounded cross section.
  • Figure 1C is a side view of the suture needle that has been rotated
  • Figures 2A and 2B are perspective views of the side views presented by
  • Figures 1A and IB respectively.
  • Figure 3 describes a perspective close-up view of the conical point portion and adjacent tip portion of the surgical needle.
  • Figure 4 is a side view that describes the angular relationship between the conical point portion and the flat surfaces of the tip portion.
  • Figure 5 describes a perspective view of a conical point portion having a generally parabolic shape.
  • Figure 6 is a side or profile view of a conical point portion having a generally parabolic shape and showing the angular relationship between the conical point portion and the flat surfaces of the tip portion.
  • Figure 1A describes a side view of the suture needle of the present invention.
  • Needle 10 has a shaft portion JL «• tip portion H, a conical point portion 15 and a point 17.
  • Tip portion H comprises at least two flat surfaces 19.
  • a cutting edge 21 may be disposed between the flat surfaces 19.
  • Conical point portion 15 is of substantially round cross section adjacent to point l ⁇ .
  • substantially round cross section is meant a round or substantially rounded cross section without any sharp, angular or square edges.
  • Substantially round cross sections include elliptical cross sections and sections incorporating straight edges connected by radiused edges such as the conical point portion 15 cross section of Figure IB.
  • Figure IC is a side view of the suture needle 10 that has been rotated 45° about the longitudinal centerline 23 with respect to the view of Figure IB.
  • the suture needle described in these figures has four flat surfaces 19 comprising the tip portion 13_, wherein a cutting edge 2 ⁇ , may be disposed between each adjacent pair of flat surfaces 19.
  • the use of four flat surfaces for the figures is descriptive only and is intended to represent all tip portion configurations having at least two flat surfaces, an optional cutting edge disposed between the two flat surfaces, a conical point portion and a point.
  • Figures 2A and 2B are perspective views of the side views presented by Figures 1A and IB respectively.
  • Figure 3 describes a perspective close-up view of the conical point portion 15 and adjacent tip portion 13 of the surgical needle.
  • the corresponding side view of Figure 4 describes cone angle C between a plane tangent to the surface of the conical point portion 15 and the longitudinal centerline 23, and plane intersection angle £ between the plane of a flat surface 21 and longitudinal centerline 23. It is apparent from Figures 3 and 4 that cone angle C is greater than plane intersection angle JPI.
  • These views also show how the use of conical point portion 15 allows the use of a smaller plane intersection angle P_l than would otherwise be practical because the point would be extremely weak with such a small plane intersection angle if a separate conical point portion was not used.
  • the conical point portion ⁇ > may be of a generally parabolic shape having a curved profile 16 as shown by the perspective view of Figure 5. Such a curved profile is of a substantially round cross section adjacent to the point.
  • the plane 25 tangent to the conical point portion 15 is to be fitted tangent to the conical point portion at the midpoint of the length 27 of the conical point portion 15. This is described by Figure 6.
  • the length 27 of the conical point portion 15 is defined as the shortest distance between the point Y7_ and the intersection of the conical point portion 15 and the flat surface 19.

Abstract

A suture needle (10) having, in sequence, a shaft portion (11), a tip portion (13), a conical point portion (15) and a point (17). The shaft portion (11) may be straight or curved, and cylindrical or tapered. The tip portion (13) has at least two substantially flat surfaces (19). The conical point portion (15) is of conical shape having a substantially round cross section adjacent to the point (17) of the needle (10). A plane (25) tangent to the surface of the conical point portion (15) makes a greater angle (C) with respect to the longitudinal centerline (23) of the needle (10) than does the angle (PI) formed by the intersection of a plane through a flat surface (19) of the tip portion (13) and the longitudinal centerline (23) of the needle (10).

Description

TITLE OF THE INVENTION
A SUTURE NEEDLE
FIELD OF THE INVENTION
The present invention relates to the field of suture needles.
BACKGROUND OF THE INVENTION
Suture needles with cutting edges are conventionally made with tip portions having at least two substantially flat surfaces with a cutting edge disposed between the at least two flat surfaces. The flat surfaces are at a slight angle with respect to the longitudinal axis of the needle; these surfaces converge to form the point of the needle. A common problem with needles of this type is burring or bending of the point of the needle because of insufficient metal at the point to resist the stresses imposed on the point during use.
Additionally, if four or more flat surfaces are used to form the tip portion of the needle, it is quite difficult to manufacture the needle to repeatedly achieve a point resulting from a common, perfect intersection of the four or more flat surfaces with the longitudinal centerline of the needle.
U.S. Patent 3,094,123 to Kurtz attempts to address these problems by removing the point of a cutting needle by grinding it away into an arc-like shape with the arc substantially perpendicularly intersecting the longitudinal centerline of the needle. This solution strengthens the tip of the needle but compromises the piercing effectiveness of the needle. U.S. Patent 3,636,955, also to Kurtz, proposes an alternative solution by describing a point formed by grinding away the needle tip to form a single planar surface that the inventor calls a chisel-type cutting edge. The planar surface is preferably 45° with respect to the longitudinal centerline of the needle. U.S. Patent 4,128,351 also to Kurtz describes a similar solution. U.S. Patent 4,513,747 to Smith proposes a similar solution wherein each flat surface of the tip portion is ground away at a greater angle with respect to the needle centerline than the angle formed by the remainder of the flat surface. This method thus requires an additional grinding step for each flat surface. If four flat surfaces are used, it does not avoid the manufacturing difficulty of achieving a common intersection point with the new tip surfaces.
SUMMARY OF THE INVENTION
The present invention is a surgical needle having, in sequence, a shaft portion, a tip portion, a conical point portion and a point. The needle has a longitudinal centerline. The shaft portion constitutes most of the length of the needle and is intended primarily to provide a useful gripping surface by which the needle may be grasped by a conventional needle driver. The shaft portion is typically of rounded cross section although other cross sections such as square or triangular are possible. The shaft portion may be cylindrical or tapered along its length, and may also be either straight or curved along its length wherein the longitudinal centerline is consequently also straight or curved. The tip portion comprises at least two flat surfaces and preferably has a cutting edge disposed between the flat surfaces. The tip portion may, for example, have as many as five flat surfaces and five cutting edges. Each flat surface lies in a plane that intersects the longitudinal centerline at a plane intersection angle. The conical point portion is of substantially round cross section adjacent to the point and forms a cone angle defined as the angle between a plane tangent to the surface of the conical point portion and the longitudinal centerline. The cone angle is greater than the plane intersection angle.
The conical point portion of the surgical needle of the present invention achieves a strong, burr-resistant point offering both good strength and good piercing characteristics with corresponding low penetration forces. The strength results from the cone angle being greater than the plane intersection angle, and also from the symmetric, round cross section of the conical point portion adjacent to the actual point. These two factors provide an increased cross sectional area adjacent to the point, thereby providing a substantial strength increase over conventional, prior art needles.
For a surgical needle where it is apparent that forces applied to the point may be from any direction, the use of a point having a symmetrical, round cross section provides for the greatest strength and resistance to burring or bending of the tip. Further, the conical point portion is simple to manufacture because of its symmetry. It may be made, for example, by grinding while rotating the needle with respect to the grinding surface. The conical point portion also reduces the need for four or more flat surfaces of the tip portion to be aligned to intersect at a common point.
The conical point portion may also be made to have a generally parabolic shape having a curved rather than straight profile.
The flat surfaces of the tip portion may also be made concave by the use of hollow grinding techniques. Flat surfaces herein include concave, hollow ground surfaces as well as truly flat surfaces. For purposes of calculating a plane intersection angle for these concave surfaces, the plane should intersect with the edges of the concave surface. The use of a conical point portion also allows for the use of a smaller plane intersection angle, which in turn further reduces penetration forces during use.
A suture may be affixed to the end of the needle opposite the point by various methods known in the art.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1A describes a side or profile view of the suture needle of the present invention. Figure IB describes a cross section of a conical point portion having a substantially rounded cross section. Figure 1C is a side view of the suture needle that has been rotated
45° about the longitudinal centerline in comparison to the view of Figure 1A. Figures 2A and 2B are perspective views of the side views presented by
Figures 1A and IB respectively. Figure 3 describes a perspective close-up view of the conical point portion and adjacent tip portion of the surgical needle. Figure 4 is a side view that describes the angular relationship between the conical point portion and the flat surfaces of the tip portion.
Figure 5 describes a perspective view of a conical point portion having a generally parabolic shape. Figure 6 is a side or profile view of a conical point portion having a generally parabolic shape and showing the angular relationship between the conical point portion and the flat surfaces of the tip portion.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1A describes a side view of the suture needle of the present invention. Needle 10 has a shaft portion JL «• tip portion H, a conical point portion 15 and a point 17. Tip portion H comprises at least two flat surfaces 19. A cutting edge 21 may be disposed between the flat surfaces 19. Conical point portion 15 is of substantially round cross section adjacent to point l∑. By substantially round cross section is meant a round or substantially rounded cross section without any sharp, angular or square edges.
Substantially round cross sections include elliptical cross sections and sections incorporating straight edges connected by radiused edges such as the conical point portion 15 cross section of Figure IB. Figure IC is a side view of the suture needle 10 that has been rotated 45° about the longitudinal centerline 23 with respect to the view of Figure IB.
The suture needle described in these figures has four flat surfaces 19 comprising the tip portion 13_, wherein a cutting edge 2Λ, may be disposed between each adjacent pair of flat surfaces 19. The use of four flat surfaces for the figures is descriptive only and is intended to represent all tip portion configurations having at least two flat surfaces, an optional cutting edge disposed between the two flat surfaces, a conical point portion and a point. Figures 2A and 2B are perspective views of the side views presented by Figures 1A and IB respectively.
Figure 3 describes a perspective close-up view of the conical point portion 15 and adjacent tip portion 13 of the surgical needle. The corresponding side view of Figure 4 describes cone angle C between a plane tangent to the surface of the conical point portion 15 and the longitudinal centerline 23, and plane intersection angle £1 between the plane of a flat surface 21 and longitudinal centerline 23. It is apparent from Figures 3 and 4 that cone angle C is greater than plane intersection angle JPI. These views also show how the use of conical point portion 15 allows the use of a smaller plane intersection angle P_l than would otherwise be practical because the point would be extremely weak with such a small plane intersection angle if a separate conical point portion was not used. The conical point portion ϋ> may be of a generally parabolic shape having a curved profile 16 as shown by the perspective view of Figure 5. Such a curved profile is of a substantially round cross section adjacent to the point. For purposes of determining cone angle C for these parabolic shapes, the plane 25 tangent to the conical point portion 15 is to be fitted tangent to the conical point portion at the midpoint of the length 27 of the conical point portion 15. This is described by Figure 6. The length 27 of the conical point portion 15 is defined as the shortest distance between the point Y7_ and the intersection of the conical point portion 15 and the flat surface 19.

Claims

We Cl aim :
1. A suture needle comprising, in sequence, a shaft portion, a tip portion, a conical point portion and a point, and further having a longitudinal centerline, wherein the tip portion has at least two flat surfaces, said flat surfaces each being in a plane that intersects the centerline at a plane intersection angle, and further having a conical point portion of substantially round cross section, wherein said conical point portion forms a cone angle between a plane tangent to the surface of the conical point portion and the longitudinal centerline, and wherein said cone angle is greater than said plane intersection angle.
2. A suture needle according to claim 1 wherein the shaft portion is a cylindrical shaft portion of substantially constant diameter along the length of the shaft portion.
3. A suture needle according to claim 1 wherein the shaft portion is a tapered shaft portion of varying diameter along the length of the shaft portion.
4. A suture needle according to claim 1 wherein the shaft portion is substantially straight along the length of the shaft portion.
5. A suture needle according to claim 1 wherein the shaft portion is substantially curved along the length of the shaft portion.
6. A suture needle according to claim 2 wherein the tip portion has two flat surfaces.
7. A suture needle according to claim 3 wherein the tip portion has two flat surfaces.
8. A suture needle according to claim 4 wherein the tip portion has two flat surfaces.
9. A suture needle according to claim 5 wherein the tip portion has two flat surfaces.
10. A suture needle according to claim 2 wherein the tip portion has three flat surfaces.
11. A suture needle according to claim 3 wherein the tip portion has three flat surfaces.
12. A suture needle according to claim 4 wherein the tip portion has three flat surfaces.
13. A suture needle according to claim 5 wherein the tip portion has three flat surfaces.
14. A suture needle according to claim 2 wherein the tip portion has four flat surfaces.
15. A suture needle according to claim 3 wherein the tip portion has four flat surfaces.
16. A suture needle according to claim 4 wherein the tip portion has four flat surfaces.
17. A suture needle according to claim 5 wherein the tip portion has four flat surfaces.
18. A suture needle according to claim 2 wherein the tip portion has five flat surfaces.
19. A suture needle according to claim 3 wherein the tip portion has five flat surfaces.
20. A suture needle according to claim 4 wherein the tip portion has five flat surfaces.
21. A suture needle according to claim 5 wherein the tip portion has five flat surfaces.
PCT/US1994/004808 1993-07-01 1994-05-04 A suture needle WO1995001129A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU71995/94A AU7199594A (en) 1993-07-01 1994-05-04 A suture needle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8650093A 1993-07-01 1993-07-01
US08/086,500 1993-07-01

Publications (1)

Publication Number Publication Date
WO1995001129A1 true WO1995001129A1 (en) 1995-01-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/004808 WO1995001129A1 (en) 1993-07-01 1994-05-04 A suture needle

Country Status (3)

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US (1) US5464422A (en)
AU (1) AU7199594A (en)
WO (1) WO1995001129A1 (en)

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WO1996041575A1 (en) * 1995-06-10 1996-12-27 Forschungszentrum Karlsruhe Gmbh Surgical suturing needle
EP0809968A1 (en) * 1996-05-30 1997-12-03 Ethicon, Inc. Taper point needle
US6129741A (en) * 1995-06-10 2000-10-10 Forschungszentrum Karlsruhe Gmbh Surgical suturing needle
WO2004006988A2 (en) 2002-07-17 2004-01-22 Tyco Healthcare Group Lp Union stress needle

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US8915943B2 (en) 2007-04-13 2014-12-23 Ethicon, Inc. Self-retaining systems for surgical procedures
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US20130238021A1 (en) 2010-04-29 2013-09-12 Jeffrey M. Gross High-Density Self-Retaining Sutures, Manufacturing Equipment and Methods
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JP2014504894A (en) 2010-11-03 2014-02-27 アンジオテック ファーマシューティカルズ， インコーポレイテッド Indwelling suture material for eluting drug and method related thereto
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996041575A1 (en) * 1995-06-10 1996-12-27 Forschungszentrum Karlsruhe Gmbh Surgical suturing needle
US6129741A (en) * 1995-06-10 2000-10-10 Forschungszentrum Karlsruhe Gmbh Surgical suturing needle
EP0809968A1 (en) * 1996-05-30 1997-12-03 Ethicon, Inc. Taper point needle
WO2004006988A2 (en) 2002-07-17 2004-01-22 Tyco Healthcare Group Lp Union stress needle
EP1545326A2 (en) * 2002-07-17 2005-06-29 Tyco Healthcare Group Lp Union stress needle
EP1545326A4 (en) * 2002-07-17 2010-06-09 Tyco Healthcare Union stress needle
US7981137B2 (en) 2002-07-17 2011-07-19 Tyco Healthcare Group Lp Uniform stress needle

Also Published As

Publication number Publication date
AU7199594A (en) 1995-01-24
US5464422A (en) 1995-11-07

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