JP2001070452A - Cannula introducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the force which is coaxial with the progression direction of a cannula and in a direction opposite thereto a needle body wen the cannula is guided to a blood vessel assured by a needle. SOLUTION: This cannula introducing device 50 consists of a cannula body 10 which consists the cannula 11 and of a cannula supporting cylinder 12 for supporting this cannula 11, the needle body 20 which consists of the needle 21 for pricking to be inserted into the cannula and a needle supporting cylinder 22 for supporting the needle, and a guide means which guides the cannula 11 into the blood vessel assured by pricking of the needle 21 while rotating the cannula 11 around the needle 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cannula introduction device, and more particularly, to a cannula introduction device provided with a guide means for guiding a cannula in a blood vessel through which the needle is punctured while rotating the needle around the needle, thereby securely inserting the cannula into the blood vessel. The present invention relates to a guide device for guiding a cannula.

[0002]

2. Description of the Related Art Generally, it takes a long time to complete a blood transfusion or infusion of a transfusion to a patient, so that the patient must keep a posture in which a puncture site is fixed for a long time.
The burden on the patient must be large, it must be as safe and reliable as possible, and if the blood transfusion is performed directly with a syringe needle punctured in the blood vessel, the patient will only move slightly. The injection needle may cut the blood vessel or cause severe pain, or the sharp tip may cause the injection needle to easily come off the puncture site, which is undesirable. Therefore, conventionally, for infusion of blood transfusion or infusion, etc., a cannula body composed of a cannula and a cannula support cylinder, a needle inserted into the cannula and a needle body composed of a needle support cylinder supporting the needle are configured. Was implemented with a cannula introduction device. That is, such a cannula introduction device was used in the following procedure. First, puncture the needle percutaneously to secure the blood vessel, then support and fix the needle with one hand,
With the other hand, advance the cannula along the needle towards the tip of the needle, guide the cannula into the blood vessel secured by the needle, and then remove the needle from the blood vessel, via the cannula guided into the blood vessel. It performs blood transfusion and infusion of infusions.

In the above-described conventional cannula introduction device 80, in order to guide the cannula 61 into a blood vessel, as shown in FIG. 5, an operator supports the needle 70 with one hand and the other with the other hand. It has been performed by advancing the cannula 61 by hand toward the tip of the needle 71.
In order to advance 1, it is necessary to apply a force F1 to the cannula 61 in the tip direction of the needle 71. However, the force F1 is applied to the cannula 61 by one hand, and the reaction of the force F1 causes the cannula to be moved by the other hand that supports the needle 70 unless the surgeon is conscious of the needle 70 so as not to move. It has often been observed that a force F2 that is coaxial with and directly opposite to the force F1 that acts on the needle 61 acts on the needle body 70. In particular, when urgent blood transfusion or the like must be performed, the needle 7
Applying the force F2 to zero was frequently observed. On the other hand, the needle 71 punctured in the blood vessel 90 is a little as small as about 1 to
Even if the force F2 is applied in the direction opposite to the tip direction of the needle 1, the needle 71 will easily fall out of the blood vessel 90 whose angle has been ensured, and as a result, the cannula 61 will not be able to be guided into the blood vessel 90 and will be punctured again. Had to be redone. However, such re-puncture is not only painful due to the puncture, but also causes delay in blood transfusion and the like, which is not only a great burden for the patient, but also a considerable burden for the operator. In particular, such a phenomenon can be caused by puncturing the blood vessel 9.
The smaller the value of 0, the more noticeable the expression.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is provided to solve the inconvenience of the above-mentioned conventional cannula introduction device, and its object is to guide a cannula to a blood vessel secured by a needle. Another object of the present invention is to provide a cannula introduction device having a configuration in which a force acting on the needle body in the same direction as the traveling direction of the cannula is not applied to the needle body.

[0005]

In order to solve the above-mentioned problems, a configuration adopted by a cannula introduction device according to the present invention includes a cannula body including a cannula, a cannula support cylinder for supporting the cannula, and a cannula inside the cannula. A needle body comprising a puncture needle inserted through the needle and a needle support tube supporting the needle, and guide means for guiding the cannula into a blood vessel secured by puncture of the needle while rotating the cannula around the needle In the cannula introduction device, the guide means includes a portion of the support tube and a portion of the cannula support tube which are threaded so that the cannula support tube can be screwed into the needle support tube.

According to the above configuration, if the cannula support cylinder is rotated to release the screw of the cannula support cylinder screwed to the needle support cylinder, the cannula advances toward the tip of the needle and the cannula advances. Since no force acts in the opposite direction coaxially with the direction, the cannula can be reliably and smoothly guided into the blood vessel.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a cannula introduction device 50 according to the first embodiment. The cannula introduction device 50 shown in FIG.
1C and the cannula body 10 shown in FIG. 1C. The needle body 20 includes a needle 21 and a needle support tube 22. The needle support tube 22 has the rear end of the cannula support tube 12 inside. A hollow cylindrical storage part 22b to be inserted and stored is formed. Then, as shown in FIG.
(b) A cutout 23 is formed in a part of the circular peripheral wall 22a near the front end to be inclined toward the needle tip. Further, the needle support cylinder 2
2, a frusto-conical needle base 22c for fixing the needle 21 is formed in the accommodating portion 22b as shown in FIGS. 1B and 3, and the needle base 22c has a cannula support cylinder. 1
2 can be fitted at the rear end.

Next, the cannula body 10 will be described. As shown in FIG. 1C, the cannula body 10 comprises a cannula 11 and a cannula support tube 12, and the cannula support tube 12 has a rear end portion and a front end portion. Is formed in a cylindrical shape, and the middle portion is formed in a truncated cone shape. The proximal end of the cannula 11 is fixed to the front end of the cannula support tube 12, and the needle 21 is inserted into the cannula 11. ing. In the rear end portion of the cannula support tube 12, a truncated conical hollow portion 12b is substantially the same as the needle base 22c so as to be fitted to the needle base 22c as shown in FIGS. The cannula support cylinder 12 has an insertion hole 12c for the needle 21 at an intermediate portion thereof. Furthermore, the circular outer peripheral surface 1 at the rear end of the cannula support cylinder 12
As shown in FIGS. 2 and 3, 2a is in contact with the inner peripheral surface of the peripheral wall of the storage portion 22b, and a guide member 13 is formed to project from the circular outer peripheral surface 12a. Note that the guide member 13 is not limited to the plate shape as shown in FIGS. 1C and 2 and may be a rod shape. Also, the cannula support tube 12
May be provided with wings.

The cannula introduction device 50 shown in FIG. 1 having the above configuration is operated as follows. First,
The needle 21 is inserted into the rear end of the cannula support tube 12, and the needle 21 is inserted into the cannula 11. Then, when the hollow portion 12b formed at the rear end of the cannula support tube 12 is housed in the housing portion 22b of the needle body 20 by being fitted to the needle base 22c, the guide member 13 of the cannula support tube 12 just has the notch 23. At the rear end (the upper end in FIG. 1). Further, in this state, the needle 21 inserted into the cannula 11 is, as shown in FIG.
It protrudes by about 2 to 3 mm from the front end of one. The assembled cannula introduction device 50 shown in FIG. 1A is pierced into the skin,
Puncture with 1 to secure blood vessels.

[0010] Then, if a blood vessel can be secured, cannula 1
1 will be guided into the blood vessel. As described above, when the rear end of the cannula support cylinder 12 is fitted to the needle base 22c, the guide member 13 is configured to contact the rear end of the notch 23. The notch can be slid along the inclined wall surface toward the front end (the lower end in FIG. 1) of the notch. Since the notch 23 is formed so as to be inclined in the needle tip direction, the guide member 13
By sliding the cannula from the rear end to the front end of the notch 23, the cannula body 10 and, consequently, the cannula 11 advance toward the distal end of the needle 21 while rotating around the needle 21. When the guide member 13 reaches the front end of the notch 23, the notch 23 is sized so that the tip of the cannula 11 reaches the tip of the needle 21, so that the cannula 11 is smoothly inserted into the blood vessel secured by the needle 21. Can guide you.

As described above, the notch 23 formed in the needle support tube 22 and the guide member 13 formed in the cannula support tube 12 may apply a force in a direction substantially perpendicular to the center line of the cannula 11. The needle support tube 11 is supported and fixed because it is guided into the blood vessel while rotating.
The force F2 shown in FIG. 5 acting coaxially with and in the opposite direction to the traveling direction of the cannula 11 does not act. Therefore,
Since the needle 21 that secures the blood vessel does not come out, the cannula 11 can be reliably guided into the blood vessel.

The needle 21 of the cannula introduction device 50 is usually formed of stainless steel or the like, the cannula 11 is formed of a soft synthetic resin such as polyethylene, and the needle support tube 22 and the cannula support tube 12 are formed of polyurethane or polypropylene. It is formed of a rigid synthetic resin. Further, a lubricating material such as stearic acid is added to the rigid synthetic resin so that the cannula support tube 12 and the needle support tube 2
By reducing the frictional resistance between the two, a configuration that allows easy rotation may be adopted.

FIG. 4 shows a cannula introduction device 50 according to an embodiment of the present invention. This cannula introduction device 50 includes the needle body 20 of FIG. 4B and the cannula body 10 of FIG. 4C similarly to the cannula introduction device 50 according to the first embodiment. A cylindrical needle base 22c is formed at the front end of the needle support cylinder 22, and the base of the needle 21 is fixed thereto. On the other hand, the cannula body 10 is
1 and a frusto-conical cannula support tube 12. A cylindrical hollow portion 12b fitted into and screwed into the needle base 22c is formed in the cannula support tube 12 to have substantially the same size as the needle base 22c. Have been.

As shown in FIG. 4, the outer peripheral surface of the needle base 22c of the needle support tube 22 and the hollow portion 1 of the cannula support tube 12
The inner peripheral surface of the cannula support tube 12b is threaded.
Is inserted into the needle base 22c, and the cannula support cylinder 12 and the needle base 2
2c can be screwed.

When the cannula support tube 12 is screwed into the needle support tube 22, the needle 21 projects slightly from the tip of the cannula 11, as shown in FIG. 4 (a). The blood vessel can be secured by puncturing the blood vessel with the needle 21. The screws 14 and 24 formed by threading the needle support tube 22 and the cannula support tube 12 are sized so that the tip of the cannula 11 reaches the tip of the needle 21 in a loosened state. If the cannula support tube 12 is rotated to loosen the screw 24 of the screwed cannula support tube 12, the cannula 11 rotates around the needle 21 and advances to the tip of the needle 21. It is possible to smoothly and reliably guide the blood vessel into the blood vessel without the force F2 acting in the opposite direction coaxial with the blood vessel.

Incidentally, the cannula introduction device 5 according to the present invention.
0 is not limited to the above embodiment, and it goes without saying that modifications and changes are possible without departing from the spirit of the present invention.

[0017]

According to the present invention, the following effects can be obtained by the above-described configuration. In the cannula introduction device 50 according to the first aspect, if the screw 24 of the cannula support tube 12 screwed to the needle support tube 22 is loosened, the cannula 11
Since it advances in the direction of the tip of the needle 21 while rotating around the needle 1, a force F2 coaxial with and in the opposite direction to the advance direction of the cannula 11 does not act on the needle body 20 supported and fixed. Therefore, as long as the blood vessel is secured by the needle 21, the needle 2
1 ensures that the cannula 11 does not come out of the blood vessel
Can be guided into the blood vessel, and puncturing is not performed again, so that the burden on the patient and the burden on the operator can be reduced.

[Brief description of the drawings]

FIG. 1 shows a cannula introduction device according to a first embodiment, (a) is a side view of a cannula introduction device, (b) is a side view of a needle body, and (c) is a cannula. It is a side view of a body.

FIG. 2 is an enlarged front view of the cannula introduction device according to the first embodiment.

FIG. 3 is a longitudinal sectional view of the cannula introduction device according to the first embodiment.

4A and 4B show a cannula introduction device according to an embodiment of the present invention, wherein FIG. 4A is a side view of the cannula introduction device, FIG. 4B is a side view of the needle body, and FIG. It is a side view of a body.

FIG. 5 is a diagram showing a state of introducing a cannula in a conventional cannula introduction device.

[Explanation of symbols]

 10. Cannula body 11.61. Cannula 12. Cannula support tube 12a. Circular outer peripheral surface of cannula support cylinder 12b. 12. hollow portion of cannula support tube Guide member 14. Screw 20.70. Needle 21.71. Needle 22. Needle support tube 22a. Circular peripheral wall of needle support cylinder 22b. Storage part (hollow part) 22c. Needle base 23. Notch 24. Screw 50. 80. Cannula introduction device Conventional cannula introduction device

Claims (1)

[Claims] 1. A cannula body comprising a cannula, a cannula support tube for supporting the cannula, a needle body comprising a puncture needle inserted into the cannula, and a needle support tube for supporting the needle. In a cannula introduction device comprising a guide means for guiding a needle into a blood vessel secured by puncturing the needle while rotating the needle around the needle, the guide means supports the needle support cylinder so that the cannula support cylinder can be screwed into the needle support cylinder. A cannula introduction device, wherein a part of a tube and a part of a cannula support tube are threaded.