Surgical needle abstract
A surgical needle for sutural treatment having a triangle or polygon
body in cross section, including a blunt needle point with a plate
or round end and at least two cutting edges to prevent a health
care provider from mistakenly hurting themselves even if the needle
comes into contact with the tissue of the health care provide, and
to provide a property that enables the needle to pass smoothly through
tissues. A first face of the body may be ground by a grinding apparatus
specially made for the surgical needle to form a tapered slope and
the cutting edges. By pressing a material piece of the needle in
a V-shaped groove it forms a second and third face and readily produces
a high quality surgical needle.
Surgical needle claims
What is claimed is:
1. A surgical needle having a triangular cross section at a body
thereof, said surgical needle comprising:
a face tapered along a longitudinal direction of said body so that
said body has thinner thickness on a tip side thereof than on the
a pair of cutting edges provided at opposite sides of said face
in a longitudinal direction of said body; and
a blunt edge provided in opposition to said face, said blunt edge
expanding to a needle point so that said surgical needle has no
2. A surgical needle as set forth in claim 1 wherein at said needle
point said cutting edges are spaced a part.
3. A surgical needle as set forth in claim 1 wherein said face
is ground in a transverse direction perpendicular to said longitudinal
4. A surgical needle as set forth in claim 1 wherein said body
5. A surgical needle as set forth in claim 1 wherein said body
6. A surgical needle as set forth in claim 1 wherein said face
is formed by grinding and other faces of the surgical needle are
formed by press.
7. A surgical needle as set forth in claim 1 wherein said needle
point has a contact area for contacting tissues, said contact area
providing a predetermined resistance against entry of said needle
into said tissue.
8. A surgical needle as set forth in claim 2 wherein said face
is ground in a transverse direction perpendicular to said longitudinal
9. A surgical needle having a polygonal cross section at a body
thereof, said surgical needle comprising:
a first face tapered along a longitudinal direction of said body
so that said body has thinner thickness on a tip side thereof than
on the opposite side;
a pair of cutting edges provided at opposite sides of said first
face in a longitudinal direction of said body;
a second face provided in opposition to said first face; and
a needle point formed in a plate shape by and between said first
and second faces.
Surgical needle description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority benefits under 35 U.S.C .sctn.119
of Japanese application Serial No. 5-111155 filed Apr. 15th, 1993
the entire disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a surgical needle for a suture and, more
particularly, to a surgical needle having a triangular cross section
at its body and a grinding apparatus for manufacturing the surgical
2. Description of Related Art
Conventional surgical needles are known in the art, such as disclosed
in Japanese Utility Model Publication, No. Showa-62-23457 and Japanese
Patent Publication, No. Heisei-1-54075. Any of these surgical needles
have a triangular cross section and a pointed body to reduce resistance
against penetration when passed through the tissues.
Problems of infections among health providers and patients involved
in infectious diseases, such as hepatitis, AIDS, MRSA (Methicillin-Resistant
Staphylococcus Aureus), and whatever, are raised as major social
problems these days. Such infections may happen by way of a fluid,
such as blood or the like, and as a carrier when a health provider,
such as a doctor or the like, inadvertently hurts herself or himself
with medical instrument. Hence, a needle with a sharp point may
hurt a health provider therefore, the health provider must pay close
attention to handling needles due to the tremendous risks of infection
resulting in the health provider enduring enormous mental pressure
associated with risks.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a safe surgical
needle which minimized the injury to a health provider even if the
provider handles it in an improper manner and thereby to solve the
problems happening in association with medical circumstances these
The foregoing object is accomplished with a surgical needle having
a triangular cross section at a body to include a face tapered along
a longitudinal direction of the body, and a pair of cutting edges
provided at opposite ends of the face in a transverse direction
of the body. An edge provided in opposition to the face is blunted
so that the needle point never enters into tissues unless a predetermined
force or above is applied thereto, thereby blunting a needle point
to prevent a health provider from being hurt at mistake. After pushed
into tissues by a certain force, the surgical needle passes through
the tissues with the cutting edges incising the tissues under reduced
resistance against penetration of the needle.
According to a preferred embodiment of the present invention, the
cutting edges are formed separately from the needle point. The tapered
face could be ground in a transverse direction perpendicular to
the longitudinal direction to make the cutting edges sharper.
In another aspect of the present invention, the body of a surgical
needle has a polygonal cross section. The surgical needle includes
a first face tapered along a longitudinal direction of the body
so that the body has thinner thickness on a tip side thereof, a
pair of cutting edges provided at opposite ends of the first face
in a transverse direction of the body, and a second face provided
in opposition to the first face. The needle point of the surgical
needle is formed in a plate shape so as to be blunt by the first
and second faces. The blunt needle point gives increased resistance
when pushed into tissues, thereby reducing the risks of hurting
health providers by mistake.
In addition, an apparatus for grinding a face of a surgical needle
tapered along a longitudinal direction of a body of the surgical
needle which is able to manufacture the surgical needle having a
polygonal cross section at the body. The apparatus includes a grinder
for grinding in a transverse direction perpendicular to the longitudinal
direction, and a workpiece table for holding a plurality of surgical
needles. The workpiece table includes a top face defining a shape
of a ground face of the surgical needle, and a plurality of grooves
for holding a bottom side of each of the surgical needles, formed
on the top face.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects and features of the present invention
are apparent to those skilled in the art from the following preferred
embodiments thereof when considered in conjunction with the accompanied
drawings, in which:
FIG. 1 is a perspective view showing a surgical needle according
to a preferred embodiment of the present invention;
FIG. 2 is a perspective view showing a cutout of the body of the
surgical needle in FIG. 1;
FIGS. 3(a) to 3(c) are fragmentary illustrations showing a manufacturing
process of a surgical needle in FIG. 1;
FIGS. 4(a), 4(b) are fragmentary illustrations showing operation
of a grinding apparatus for grinding the surgical needle in FIG.
FIGS. 5(a) to 5(f) are perspective views showing point shapes of
surgical needles according to other embodiments of the invention;
FIGS. 6(a) to 6(c) are cross-sectional diagrams illustrating molds
used for pressing the surgical needles according to the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings in detail, in particular, to FIGS. 1
and 2 surgical needle designated by numeral 1 according to a preferred
embodiment of the invention is shown.
As shown in FIG. 1 the surgical needle 1 is a curved needle for
sutural treatments having a triangular cross section. A body 2 is
arranged on a tip side of the surgical needle 1 and an eye 3 is
located on a shaft side for holding a suture. The body 2 has three
faces 4A, 4B, and 4C, and three edges 5A, 5B, and 5C at which the
three faces meet.
Among the faces, a first face 4A is an outer face of the curvature
of the surgical needle 1 and is ground in a transverse direction
by a polishing disk or the like. The other second and third faces
4B and 4C are made by a press within a mold therefor. A first edge
5A, among the three edges, is situated inside the curvature of the
surgical needle and has a blunt verge. Second and third edges located
on opposite sides of the first face 4A have sharp verges.
The body 2 has a configuration having a cross section as shown
in FIG. 2 in succession up to a needle point P of the body. The
first edge 5A has a dull, flattened ridge and reaches the needle
point P while keeping the flattened top. To the contrary, the first
face 4A is a successive surface that approaches to the first edge
5A as it gets closer to the needle point P, and makes the needle
point P to be in a shape like a spatula.
On the other hand, although the second and third edges 5B, 5C are
in succession up to the needle point P of the body 2 these edges
5B, 5C never meet at the needle point P to make the needle point
to be blunt. That is, when the surgical needle 1 is put onto tissues,
such as skin, the needle point P of the body 2 always contacts to
the tissues through a liner or areal section, so that the surgical
needle penetrates the surface of the tissues only when applied with
a predetermined force or more. Once the needle 1 enters the tissues,
sharp cutting edges 5B, 5C incise the tissues to reduce resistance
against penetration, thereby allowing the health providers to handle
the surgical needle 1 smoothly.
Referring to FIGS. 3 and 4 a manufacturing process of the body
2 will be described. The curved needle as described in this embodiment
is furnished to this shape by bending after the needle body is formed
from a straight shaped material piece.
First, a material piece la made of stainless steel or the like
is fixed to a mold 10 having a V-shaped groove 11 and pressed from
the top side, as shown in FIG. 3(a). The material piece 1a, initially
in a cylindrical shape, is transformed into a triangular prism by
means of the V-shaped groove 11 through this work. The V-shaped
groove is composed of a bottom face 11a and the groove side walls
11b, 11c by which the second and third faces 4B, 4C, pressed faces
of the needle, are made. The bottom face 11a of the V-shaped groove
11 crushes the first edge 1A formed between the second and third
faces 4B, 4C to be blunted. When pressed from its top side, the
material piece 1a provides protruded portions, or burrs 7 7 protruded
from the pressed surface at top opposite ends in case the inserted
material 1 a has a large volume.
As shown in FIG. 3(b), a ground face 4A is formed at a portion
opposite to the first edge 5A by grinding. This grinding work is
conducted with the a grinding apparatus shown in FIG. 4. The grinding
apparatus 20 includes a grinding disk 21 in which a rotary side
face is used as a grinding face 21a, and a workpiece table 22 for
setting a plurality of material pieces 1a through clamping. The
grinding face 21a of the grind disk 21 contours a side face in the
form of part of an ellipse as shown in FIG. 3(b).
In FIG. 4(b), a perspective view of the workpiece table 22 a plurality
of the V-shaped grooves 23 juxtaposed to one another are drilled
on the top face 22b of the workpiece table body 22a. The triangular
prism material pieces 1a machined at the process shown in FIG. 3(a)
are set into the grooves 23. These material pieces 1a are fixed
by being suspended between the fixing plate 22 and the workpiece
table body 22a.
The top face 22b of the workpiece table body 22a has a gentle slope
so as to coincide with the grinding side face 21b of the grind disk
21. Therefore, even where the grind disk 21 works for grinding,
the grinding face 21a never interferes with the top face 22a of
the workpiece table 22. In addition, since the material piece 1a
is held by the V-shaped groove at the bottom side thereof, the material
piece 1a is free from stress during grinding work, so that a high-quality
surgical needle is produced.
The grinding face 21a of the rotating grind disk 21 contacts with
the tip of the material piece 1a in such a manner, thereby forming
the first face 4A on the material piece 1a as a ground face. FIG.
3(b) depicts a situation during grinding work. The ground face having
a gently curved side shape is formed on and across the material
1a, and, as this grinding work goes on, the burrs 7 7 are ground
away, thereby forming sharp edges. This grind work is done by the
grind disk 21 moving back and forth a number of times. Consequently,
the grind disk 21 always grinds in the transverse direction perpendicular
to the longitudinal direction of the material piece 1a, so that
the first face 4A becomes a ground face with edges transversely
oriented, thereby forming edges having excellent cutting property.
When the grind work ends, there produces the material piece 1 a
having the body 2 as shown in FIG. 3(c) is produced. That is, the
first edge 5A having the flatten ridge and the ground first face
4A come close with one another at the needle point P of the body
2 to form a plate shape. The adjustment of the down feed amount
of the grind disk allows thickness of the end of the needle point
P to be set in various ways and, as a matter of course, allows the
end of the needle point P to be formed into a liner shape. The second
and third edges 5B, 5C are formed on the opposite sides, of the
first face 4A, at which shaped edges are formed. On the other hand,
such transverse grinding does not work against the edge at the needle
point P because it is done in the extending direction of the edge,
thereby producing the needle point P which is not easy to incise.
After this process, the material piece 1a is made to a surgical
needle 1 as shown in FIG. 1 through a drilling process of an eye
3 not shown and a bending process. The surgical needle 1 according
to this embodiment easily obtains the configuration feature described
above only by being pressed and ground, thereby providing high productivity.
It is to be noted that although in the manufacturing process of
the surgical needle according to the present invention the material
piece 1a is transformed to the triangular prism by press in FIG.
3(a), the material piece could be pressed into a triangular pyramid
using another mold after being ground in a cone and then be furnished
to a body having a suitable triangular cross section during a grinding
process done afterward. Although the surgical needle 1 is constituted
so that the first face 5A is arranged inside of the curvature, the
first face could be arranged outside of the curvature. Moreover,
although the surgical needle 1 has the eye 3 as a construction
for threading a suture, opened at a side face of the shaft of the
needle, the surgical needle could be an eyeless needle with a long
hole drilled to be open in the longitudinal direction of the body
from the end of the shaft. In addition, although the needle has
the curvature in this embodiment, the needle could be straight or
Referring to FIGS. 5 and 6 other shapes of the surgical needle
according to the present invention are shown. FIG. 5 shows perspective
views of various body types of the needle according to the present
invention. FIG. 6 shows vertical cross-sections of various types
of molds used for pressing.
In FIG. 5(a), the body 2 has a knife shaped, ellipse, and round
point. The top of the first edge 5A is crushed to be flatten, so
that the point is in a plate shape as a result of grinding. A body
2B shown in FIG. 5(b) has a sharper ridge of the first edge 5A,
and according to the sharper ridge the point P becomes sharper.
A body 2C shown in FIG. 5(c) is sharpened more than the body 2 or
2B by grinding. In this body 2C, second and third edges 5B, 5C are
formed separately from the needle point P, so that the point P is
round and blunt. A body 2D, as shown in FIG. 5(d), the second and
third faces 4B, 4C are concave and respectively have an indentation
along the longitudinal direction. A body 2E, as shown in FIG. 2E,
has a rectangular cross section, different from the bodies 2 2B,
to 2D having triangular cross sections. This body 2E has four edges
15A to 15D, however, it is enough that the third and forth edges
15C, 15D have sharp ridges. The first face 14A and the second face
14B in opposition to the first face approach each other as they
come close to the point P, and the point P becomes a plate shape.
It is to be noted that although the body 2E has an areal end at
the point P, the end could be a liner shape of a body 2F as indicated
in FIG. 5(f) by adjusting the amount grinding amount.
Such various types bodies 2 2B to 2F are readily formed by changing
molds used for press. FIGS. 6(a) to 6(c) show examples of mold shapes.
The body 2B shown in FIG. 5(b) can be formed with a mold in FIG.
6(a). This mold has no bottom face in the V-shaped groove 31 which
is different from the mold of the embodiment described above and
shown in FIG. 2(a), and therefore, a material piece 1a pressed by
this mold has a sharper first edge 5A. However, though the V-shaped
groove 31 has a tapered lower end, the tapered end is not transferred
to the material 1a because of the nature of the press, and the first
edge 5A remains blunt. Adjustment of capacity of the mold can prevent
the material piece 1a from being pressed with burrs at the partition
line of the mold as shown in FIG. 6(a).
The body 2D in FIG. 5(d) is pressed by a mold 41 shown in FIG.
6(b). Using such a mold 41 allows the concave second and third faces
5B, 5C to be readily formed. The bodies 2E, 2F in FIGS. 5(e), 5(f)
can be produced using a groove 51 having a rectangular cross section
as shown in FIG. 6(c).
Resistance against entering of the surgical needle i into tissues
is determined by a contact area with the tissues at a time that
the point P is put up on the tissues. Changing the shape of the
point to various ones allows the resistance to be adjusted. That
is, it is enough that the point P has at least a shape by which
pressure on the needle is dispersed, and since the skin is elastic,
the end of the body might be a liner or areal shape as long as an
incising point of the skin does not occur.
Thus, diversifying press formation of the material piece 1a using
various types of molds allows various needle points to be produced
without changing other processes, for example, the grinding process.
Accordingly, this manufacturing process makes it possible to produce
a safe point of the surgical needle according to this invention
with various shapes mainly with the purpose that it will be used
as a the surgical needle.
It is understood that although the present invention has been described
in detail with respect to preferred embodiments thereof, various
other embodiments and variations are possible to those skilled in
the art which fall within the scope and spirit of the invention,
and such other embodiments and variations are intended to be covered
by the following claims.