Method for Tying Sewing Threads

1. Field of the Invention

The invention relates to an applicator for tying a thread for stitching a wound with individual stitches.

2. Description of the Prior Art

Different techniques are known for stitching wounds in bodily cavities by means of a thread which has to be tied. These however require difficult manipulations with needle and thread under considerable expenditure of patience and time and a specific routine.

The object of the invention consists in providing a device which may be handled in an uncomplicated manner and allows of reliable and rapid tying of threads for individual stitches in body cavities through a long endoscope tube.

In accordance with the invention, this problem is resolved in the case of the applicator defined in the foregoing by means of a coil comprising hollow windings for reception of a thread which coil is advantageously joined at an angle to an axial passage of a shaft. The thread passes through said axial passage and has an extremity led to the outside at a distal position of the applicator and may at this point be secured in an auxiliary device. Then the thread may be drawn through the shaft passage and immobilised at the proximal shaft extremity.

The applicator in accordance with the invention may be utilised with an endoscope tube, for example as shown in the German patent specification No. 3319049, so that the thread led through the coil and shaft may be offered up together with the needle to the wound which is to be stitched, to which end the wound walls are pierced by the needle using a needle holder which is also led through the endoscope tube, both under observation.

Drawing a thread provided with a needle into the applicator is performed prior to the insertion of the applicator through the endoscope tube into the bodily cavity space, as will be described in the following with reference to the drawings in which an example is illustrated.

FIG. 1 is a side view of the applicator in accordance with the invention in,

FIG. 2 is a side view of an auxiliary device for drawing the thread through the applicator shaft,

FIG. 3 is an enlarged side view of a distal extremity of the applicator with portions broken away,

FIG. 4 is an end view with portions broken away of the applicator winding,

FIG. 5 is an enlarged side view with a portion broken away of the distal shaft extremity with the sewing thread end and loop of the auxiliary device according to FIG. 2,

FIG. 6 is a partial side view that shows the application of a single stitch, with a reduced number of windings of the coil as compared to FIG. 3,

FIGS. 7 to 12 are partial side views that show the stages for forming the first half of a knot,

FIGS. 13 to 15 are partial side views that show the stages for forming the second half of a knot,

FIG. 16 is a partial side view that shows the closing of the double knot.

The applicator 1 comprises a helical tubular coil 2 having at least one full turn, which is advantageously connected to the distal shaft extremity at an angle to a shaft 3 which has a handle 4. The hollow turns of the coil form a passage 5 whose wall is slotted at the outside along part lengths of the turns, so that these slots 6 are delimited at their extremities by residual wall portions 7.

The coil passage 5 is followed by a short distal length of a longitudinal duct through the shaft in the form of an axial shaft passage 8 which has a bend 8a led radially outwards and then has a bend 8b led back to the proximal length of the axial shaft passage 8. Between the arcuate passage sections 8a and 8b, the shaft wall is transversely connected to an excision 9 in the form of a longitudinal channel in the outer surface of the shaft 3.

The shaft passage 8 may be closed off proximally by means of an elastic seal 10 against the atmosphere, and the handle is extended proximally by two mutually opposed handle sections 11 which advantageously have a V-shaped incision for gripping a sewing thread end.

An auxiliary device 12 according to FIG. 2, whose function will also be described, is provided moreover for utilisation with the applicator 1. The auxiliary device comprises a rod 13 which has an elastic catcher loop 14 (wire eye). A sleeve 15 providing a stop is pushed over the distal extermity of the rod 13 and inserted together with the same through the seal 10 into the passage 8 of the shaft 3, until the stop 15a bears on the seal. The rod 13 may then be passed through the passage 8 without damaging the loop 14, until the elastic loop 14 projects outwards via the deflector section 8a (FIG. 5).

The applicator is utilised in the following manner to form a double-loop knot for a sewing thread.

A sewing thread 16 is inserted manually into the distal extremity of the coil passage 5 and pushed through the coil 2, to which end thinner threads passing to the outside via the slots 6 may in each case be pushed back into the passage 5 under the residual wall sections 7. According to FIG. 5, the thread 16 will finally emerge from the excision 9 via the deflector section 8a and be passed through the loop 14. The thread is drawn along by drawing the rod 13 back with the thread 16 within the loop 14, until it projects out of the proximal extremity of the shaft 3, so that it may be led in a figure-8 around the securing means 11 and gripped in an incision 11. The protective sleeve 15 is also removed together with the rod 13. The applicator 1 carrying the sewing thread which is distally provided with a needle in conventional manner may now be introduced into the body cavity through an endoscope tube, e.g. according to German patent application No. 3319049. The needle 17 may then be gripped by means of a needle holder which is also inserted into the body cavity via the tube, and the single stitch may be made according to FIG. 6. The needle 17 is then pulled axially through the coil 2 (FIGS. 7 and 8) and laid around the thread end projecting out of the coil 2. The coil 2 is then twisted out of the loop formed thereby, by turning the applicator 1, so that the thread 16 forms the first half of a knot (FIG. 8). The thread loop is then pulled together according to FIG. 12, that is to say by holding the needle 17 fast and pulling the applicator whereof the proximal handle extremity has the thread fastened to it.

The needle 17 is then pulled through the coil 2 again axially by means of the needle holder according to FIG. 13, and the coil 2 is twisted out of the loop (FIG. 14) so that the second half of a knot is formed thereby which, as apparent from FIGS. 15 and 16, ties the knot upon being pulled tight.

After this, the two thread ends may be cut off, the needle and the applicator may be withdrawn from the body cavity and the applicator may be prepared for the next individual stitch.