JPS63257539A - Non-injury needle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to medical engineering, and more particularly to atraumatic needles.

The present invention is found to be most useful when applied to suturing ocular tissue in ophthalmic surgery.

The atraumatic needles of the present invention may also be used for certain other microsurgical procedures,
For example, it can be applied to tissue suturing in neurosurgery, plastic surgery, renal surgery, vascular surgery, especially small vessel surgery, and others.

[Conventional technology]

Significant advances in ophthalmology and microsurgery have made it possible today to lower the incidence of post-operative complications, especially those caused during tissue suturing and resulting from surgical trauma to the treated tissue. It has become an urgent problem to have a non-traumatic needle that contributes to this problem.

Minimizing the damage caused by the wounds inflicted on the operated tissue during suturing is achieved by using an atraumatic needle, i.e. a needle that has the characteristic that the suture thread attached to it does not exceed the maximum cross-sectional dimension of the atraumatic needle. obtained by.

Furthermore, the degree of trauma to the tissue being sutured is a function of the resistance offered by the tissue to the passage of an atraumatic needle through this tissue, i.e. the lower this resistance is, the better the tissue being treated is. Disability due to wounds will be reduced.

In the current state of the art, atraumatic needles are known for suturing ocular tissues in ophthalmic surgery (see Muller, USA, 1973, p. 831).

This known atraumatic needle is in the form of a pointed rod that is curved along its length.

This pointed rod has a small faceted cut and a tail to which the thread is attached.

These cross-sections of the needle cuttings over their entire length are polygonal.

The cutting portion has a pointed portion at its front end, the shape of which is in the shape of a triangular pyramid with a triangular cross section, and the cross section is progressive toward the end of the pointed portion. It's getting bigger. All of these triangles have straight sides.

Along the length of this needle, passing said section, there are located sections whose cross section is trapezoidal, the heights of these trapezoidal sections being substantially the same and equal to the highest height of said section. , and the width of the thicker base of these trapezoids increases steplessly until it reaches its maximum value, and then decreases smoothly to a value equal to the width of the narrower trapezoid base.

The next lengthwise sections of the needle cutting section are of rectangular shape in cross-section, and these rectangular sections have substantially the same height as the preceding section. This rectangular section smoothly merges with the ring-shaped tail section.

The feature of this previously known atraumatic needle, which has an acute angle close to the larger base of the trapezoidal cross-section, provides reliable cutting of the tissue and the passage of the atraumatic needle with the thread. and the structure of the wound groove.

However, the obtuse angle in the trapezoidal cross-section, along with the right angle between the sides of the rectangular cross-section of the terminal portion of the needle-cutting section, acts to bring the tissue into intimate contact with the face of the atraumatic needle, so that the tissue This creates a higher resistance and thus makes the tissue more susceptible to wounding, i.e., the friction forces cause it to become injured at the point of contact with the surface of the atraumatic needle.

When the atraumatic needle is withdrawn from the treated tissue, the periphery of the wound groove provided by the surfaces forming an acute angle between them is uniform and smooth, while other peripheral parts of this wound groove are scarred; In other words, it has "jagged" edges. This prolongs the (overall) post-operative treatment period for the operated tissue.

[Problem that the invention seeks to solve]

The main and essential object of the present invention is to reduce the resistance provided by the Mi weave to which the adjacent sides of each cross-section of the cut portion are sutured, thereby reducing the number of body cells destroyed by frictional forces. An object of the present invention is to provide an improved atraumatic needle that is arranged to reduce the severity of the wound.

[Means for Solving the Problems and Effects Thereof] The object of the present invention is to form a rod with a sharpened tip having a cutting part whose cross section is formed into a polygon, and a tail part so as to hold a thread. This is achieved by characterized in that at least two adjacent sides of the cross-section of the needle are concave over at least part of the length of the cutting portion and intersect at an acute angle. Become.

This construction of the atraumatic needle reduces its cross-sectional area and makes all angles between the sides of the needle acute, so that the tissue to be treated makes little contact with the sides of the needle, which makes it easier for the atraumatic needle to pass through the tissue. This results in a reduction in frictional force.

The edges of the wound groove left by this atraumatic angle after withdrawal of the atraumatic needle are uniform and smooth, which facilitates close juxtaposition of the edges of the wound groove.

Furthermore, the reduced frictional forces reduce the effort required to form a wound groove and pass an atraumatic needle through this groove;
This further facilitates the surgeon's work.

BRIEF DESCRIPTION OF THE DRAWINGS [Examples] These and other advantages of the invention will become more apparent from the detailed description of specific non-limiting exemplary embodiments, with reference to the accompanying drawings, in which: FIG.

The atraumatic needle made in accordance with the present invention has the shape of a longitudinally curved, pointed rod as shown in FIG. A curved wound groove is formed.

This rod with a sharp tip has a cutting tip part 1 (Fig. 1).
and a tail 2 adapted to hold a thread 3.

The entire cross section of this cutting part 1 is formed into a polygon.

The cutting part 1 has a pointed part 4 (Fig. 2) at its front end, and has a pentagonal pyramid shape with a triangular cross section as shown in Fig. 3, and its dimensions are as follows: It increases gradually towards the end of 4.

A portion 6 is disposed passing through the portion 4 in the longitudinal direction of the cutting portion 1, and the cross section of this portion 6 has a substantially trapezoidal shape as shown in FIG. The heights H of these trapezoidal cross-sections are substantially the same and equal to the highest height of the portion 4.

A portion 7 of the cutting portion 1 is located between the portion 6 (FIG. 2) and the tail portion 2, and the cross section of this portion 7 is a rectangular quadrilateral as shown in FIG. Height H
has a height equal to .

The cross section of the tail piece 2 is in the form of a ring, as shown in FIG.
It is determined by the diameter of the thread 3 attached to the tail 2 by means of adhesive.

the base 8 of the triangular cross-section of the pointed portion 4 (Fig. 3);
Base 9 of trapezoidal cross section (Figure 4) and base 10 of square cross section
(Fig. 5) shows the cutting part 1 which is entirely curved in the length direction.
is located on the surface 11 (FIG. 1) of and is a straight line.

Two sides 1 of each cross section of the pointed portion 4 of the needle cutout 1
2 and 13 (FIG. 3) are formed into concave surfaces so as to intersect with each other at an acute angle α and with the base 8 at an acute angle β. In this particular case the angle α is substantially equal to 30° and the angle β is also equal to 30°.

In other cases both angle α and angle β may be in the smallest practically possible range, ie in the range 1° to 60′.

The sides 14, 15 (FIG. 4) and the smaller base 16 located therebetween of the trapezoidal cross-section of the part 6 of the cutting part 1 are also formed concave.

The sides 14 , 15 intersect the small base 16 at an acute angle γ equal to 45° in this particular case, but which can vary in the range of the smallest practicable magnitude from 1° to 60°, and the large base 9 intersect in this particular case at an acute angle δ equal to 30°, but this too can vary between 1° and 60°.

Each adjacent side 17.1 of the quadrangular cross section of the part 7 of the cutting part 1
8, 19 (Fig. 5) are concave and intersect each other at an acute angle ε equal to 30° in this particular case, but in other cases it can vary between 30° and 60”; Sides 17 and 19 are in this special case 45° to base 10.
intersect at an acute angle ζ equal to , but in other cases 45° and 60
' can be changed within the range.

All sides of the cut 1 thus intersect at acute angles.

In another variant of the invention, the bases 8, 9, 10 are also formed concave.

The atraumatic needle of the present invention works as follows.

The atraumatic needle carrying the thread 3 is fixed in position by a section 7 of square cross section by means of a needle holder (not shown in the figure). Next, the atraumatic needle thus prepared is
Its sharpened end 5 is pierced into the tissue to be sutured (not shown in the drawing). As a result, the sharpened end 5 and portion 4 penetrate the tissue first to form the entrance to the wound groove (not shown). The blade formed by the acute angles α and β makes a triangular cut in the tissue, and as the part 4 penetrates deeper into the tissue to be treated, this cut has a height H at the beginning of the part 6 and a base 9 is expanded to the width value. When the sides 12 and 13 penetrate into the tissue, this tissue becomes pulled at the angles α and β by the concavity of the sides 12, 13 and by its own elasticity, so that these sides and the minimum extent We will come into contact.

The tissue is cut by the blade formed by the angles γ and δ as the section 6 with trapezoidal cross section makes its way into the tissue. The wound groove is therefore enlarged to obtain the maximum dimension of the base 9 of the portion 6.

The Mi weave has side edges 14 and 15 of part 6 and small bottom edge 16.
Due to its concavity and its own elasticity, it is pulled at the angles T and δ, and due to the curvature there is minimal contact with the sides 14, 15 and the small base 16.

This reduces friction between the tissue and the sides of the atraumatic needle.

The depth of penetration of the atraumatic needle into the tissue is limited by the needle holder, so that the first part of section 6 extends out of the tissue to be sutured. The needle holder is then removed from the needle section 7, thereby freeing the atraumatic needle and gripping it on the section 6, after which the section 7 and the tail 2 with the thread 3 are connected to the wound formed as shown. passed along the groove.

As the section 7 passes along the wound groove, the m weave surrounds the atraumatic needle across the edge formed by the angles ε and ζ and the surface formed by the base 10.

Due to the concave nature of the surfaces formed by the sides 17, 18, 19 of the square cross-section, there is less tissue contact in this part 7 with the atraumatic needle, which also reduces friction.

This atraumatic needle is then re-pierced, thus forming the entrance to the next wound groove.

The above cycle is repeated until the entire wound is sutured, after which the thread 3 is tied by any known method.

A full-size specimen of the atraumatic needle of the invention was prepared and tested in the laboratory, and it was found that the effort of stabbing and the effort of passing the needle along the wound groove was reduced by 20% or 30% compared to known needles. was proven.

[Brief explanation of the drawing]

1 is a schematic side view of an atraumatic needle according to the invention, showing in longitudinal section a portion of the tail and the thread retained therein; FIG. 2, symbolically straightened in the longitudinal direction; 3 is an enlarged sectional view taken along line m-n1 in FIG. 1, FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 1, and FIG. is an enlarged sectional view taken along line V-V in Figure 1, and Figure 6 is an enlarged cross-sectional view taken along line V-V in Figure 1.
FIG. 3 is an enlarged cross-sectional view taken along line I-VI. 1... Cutting part, 2... Tail part, 3... Thread,
4...Sharp portion, 5...Sharp end, 6
, 7...Segmented portion of the cutting part, 8.9, 10...Base of the cross section of the cutting part, 11...Surface of the cutting part, 12, 13...Side sides of the triangular cross section, 14, 15.
...Side sides of trapezoidal cross section, 16...Small base, 17, 18, 19...Side sides of trapezoid cross section, H...
Height of the cross section, α, β, γ, δ, ε... Angle in the cross section. Margin below Iiy EE

Claims (1)

[Claims] 1. An atraumatic needle formed in a pointed rod, having a cutting part (1) of polygonal cross-section and a tail part (2) adapted to hold a thread; At least two adjacent sides of the cross section of the needle (12, 13, 14, 1
5, 16, 17, 18, 19) are formed concavely over at least part of the length of the cutting part (1) and have an acute angle (α
, γ, ε).