JPS6041213Y2 - Suture with needle without step - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a nailed suture, in which the diameter of the needle and thread are made the same, resulting in a stepless nailed suture.

Conventionally, in surgery to attach a prosthetic valve to the heart, continuous or U-shaped sutures are performed due to the relationship with the prosthetic valve, but if the needle is inserted in the wrong place midway through, the thread and needle must be moved back to the beginning. You will have to put it back and pierce it again.

In this case, with the currently used nailed sutures, the thread diameter 1 and the needle diameter 2 have different thicknesses (Fig. 1), and there is a step at the joint, making it easy to return the thread and needle. become unable to do so.

In such cases, conventional methods have been to accept the slight difference in the piercing position as is, or to cut the thread and pierce it again from the beginning.

Such re-piercing is undesirable as it requires a lot of time for the surgery and poses a danger to life.

Furthermore, when penetrating a fragile tissue such as an aged blood vessel with a conventional stepped nailed suture, the tissue is often damaged, resulting in delayed healing or leakage from the blood vessel. Sutures with threads are never preferred.

Therefore, the present inventor developed and provided a stepless nailed suture thread in which the thread and needle diameters are the same, making it easier to return the thread and needle during suturing surgery, and preventing damage caused by tissue penetration. I tried to prevent it.

Embodiments according to the present invention will be described below with reference to the accompanying drawings.

Reference numeral 3 denotes a stepless suture thread, and the thread 1 and the joined end 2' of the needle 2 are constructed to have the same diameter.This stepless nailed suture thread 3 is manufactured as follows.

That is, as shown in FIG. 2, the tip 2' of the needle is formed with a gentle slope along the needle diameter from the connecting end 4 in order to eliminate the difference in level.
Either form a straight insertion hole 5' with a suitable gentle slope as shown in Figure a, or form a straight insertion hole 5' into which the thread 1 can be easily inserted as shown in Figure 3. Process it so that it has .

In the former case, the specification of Japanese Patent Application No. 51-028428 (
It can be easily formed by processing using a laser beam as disclosed in Japanese Unexamined Patent Publication No. 52-111294.

In the latter case, it is formed by ordinary mechanical processing such as turning.

In any case, the thickness created by the insertion hole 5 and the outer diameter of the needle 2 is made so that it gradually becomes thinner as it approaches the entrance of the hole 5, and the thickness d is determined by caulking this part to attach the thread to the needle. The yarn diameter is set to be approximately half of the reduction in yarn diameter that would occur if the

6.7 is a caulking type upper die and lower die, both of which operate as shown by the arrows.

Insert the thread 1 into the inner diameter 5 of the needle 2 between the caulking molds, place the thread 1 on the mounting table 8, and at the same time place the caulking end surface 4' of the needle 2 on the lower mold 7.
The needle 2 is brought into contact with one side 8' of a mounting table 8 provided in contact with the mold, and the outer periphery of the needle 2 is placed on another mounting table 9 provided close to the caulking mold.

The caulking dies 6, 7 have slopes 6', 7' which are the same as the slope formed at the joining end of the needle and thread, as shown in FIGS. 4a and 4b.

In this way, by operating the caulking molds 6 and 7, the inserted large and medium thread 1
By caulking, the diameter is reduced by 2d, and the connecting end 4 of the needle 2 is formed to have the same diameter as the thread 1, so caulking can be easily performed.

At this time, since the end 4' of the needle 2 connected to the thread 1 is abutted against the mounting table 8, the thread does not break at the end 4'.

The same applies to the case where the thread is inserted into the needle and swaged as shown in FIG.

Needle diameter 0.43mm Hole diameter 0.26m Therefore, the wall thickness at the back is 0
．． 0857rr! When a nylon thread with a diameter of 0.1023 TrrIn was inserted into a suture needle whose thickness at the n1 joint end was 0.030, and the thread was swaged using the swage mold described above, the needle base end was given a predetermined inclination, and the joint It was possible to process the outer diameter of the end to be the same as the thread diameter.

That is, the needle diameter at the joint end is the same as the thread diameter, the thread diameter in the hole is narrowed by twice the wall thickness d of the joint end, and the needle outer diameter has a gentle slope from the joint end to the needle side. The shape becomes thicker.

As detailed above, the present invention can be caulked so that the diameter of the joined end of the needle and thread is the same for both the needle and thread, so that it is possible to easily produce a stepless nailed suture thread. Can be done.

Therefore, by using a stepless nailed suture, not only can normal suturing operations be performed without causing additional damage to the tissue to be penetrated, but also it is possible to return the thread and needle and re-penetrate the suture. It is also easily possible and is very effective in suture processing.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a joint of a nailed suture according to the conventional example, Fig. 2 is an explanatory diagram showing a joint of a nailed suture according to the present invention, and Figs. 3a and b are sutures in the present invention. FIGS. 4a and 4b are cutaway views showing the joined tip of the needle, and are an explanatory view of the nailed suture caulking device according to the present invention and a front view of the caulking mold. 1... Thread, 2... Needle, 3...
Stepless nailed suture, 4...Connected end, 4'.
...Connection end surface, 5゜5' ...Insertion hole, 6
, 7... Caulking type, 6', 7'... Inclined, 8, 9... Mounting table.

Claims (1)

[Scope of utility model registration request] A nailed suture without a step, which is caulked so that the diameters of the needle and thread at the joint end of the nailed suture are the same, and the joined end on the needle side of the joint end is gently sloped.