Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-07-06
1997-09-30
Rimell, Sam
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604165, 604166, 128772, A61M 500
Patent
active
056721587
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present device relates to a catheter introducer for introducing a catheter into a blood vessel.
BACKGROUND ART
In a device to introduce a catheter into a blood vessel such as for angiography, a catheter introducer is used. As shown in FIG. 1, symbol 1 denotes a catheter introducer in general. The catheter introducer 1 includes a sheath section 2, a dilator section 3, a sheath hub 4, a sheath 5, a female hole 6, a dilator hub 7, a dilator 8, a male prism 9, and a side tube 10.
As can be seen in the drawing, the prior art catheter introducer log FIG. 1 is composed of the sheath section 2 consisting of the sheath 5 and the sheath hub 4 and the dilator section 3 consisting of the dilator 8 and the dilator hub 7. The catheter introducer 1 has the dilator section 3 set in the sheath section 2, and is inserted into a blood vessel over a guide wire.
FIGS. 2 and 3 are illustrations showing how the prior art catheter of FIG. 1 introducer is used. In the drawings, symbol 11 denotes a three-way stop cock, a guide wire is designated by symbol 12, subcutaneous tissue is designated by symbol 13, and symbol 14 designates a blood vessel. When the catheter introducer is used, a hollow needle (not illustrated) with an inner needle inserted through it is introduced into the blood vessel 14, and after removing the inner needle, the guide wire 12 is inserted through the hollow needle. The hollow needle is subsequently removed, to leave only the guide wire 12 in the blood vessel. Then, as shown in FIG. 2, the catheter introducer 1 with the dilator section 3 inserted in it is inserted into the blood vessel 14 with the guide wire 12 operating as a guide, and subsequently, with the sheath 5 of the catheter introducer 1 inserted in the blood vessel 14. As shown in FIG. 3, the dilator section 3 and the guide wire 12 are subsequently removed. Then, a catheter is inserted into the sheath 5 which operates to guide the tip of the catheter into the blood vessel 14 to complete the insertion of the catheter into the blood vessel 14. Subsequently, as required, the three-way stop cock 11 may be actuated to supply a medicine, etc. into the blood vessel through the sheath.
If the catheter introducer 1 with the dilator section 3 inserted therein is inserted into the blood vessel 14 with the guide wire operating as a guide while the sheath section 2 is being held and turned clockwise and counterclockwise, the insertion into the blood vessel 14 can be easily achieved. However, to achieve this, any means for mutually arresting the movement of the dilator section 3 and the sheath section 2 is required to prevent the relative rotation between the dilator section 3 and the sheath section 2 as well as preventing the axial displacement thereof.
To prevent the relative rotation and axial displacement of the dilator section 3 with respect to the sheath section 2, several proposals have been disclosed. The proposals are described below. The device as shown in FIG. 1 is disclosed in Japanese Patent Publication No. 91-37430 has a female polygonal hole 6 formed in the sheath section 2 and a male prism 9 formed in the dilator section 3. The male prism 9 of the dilator section 3 is inserted in the female polygonal hole 6 of the sheath section 2 to prevent the relative rotation between the dilator section 3 and the sheath section 2. Furthermore, the female polygonal hole 6 has a groove 6a formed and the male prism 9 has a rib 9a formed so that when the male prism 9 of the dilator section 3 is inserted in the female polygonal hole 6 of the sheath section, the rib 9a of the male prism 9 is fitted in the groove 6a of the female polygonal hole 6 for preventing the axial displacement of the dilator section 3 and the sheath section 2.
FIG. 4 shows a prior art device disclosed in said Japanese Patent Laid-Open No. 90-289269. The male engaging part 15 of the dilator section 3 and the female engaging part 16 of the sheath section 2 are tapered and hexagonal in section. The tapered engagement can prevent the axial displacement and the relative rota
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Kurimoto Munehito
Okada Yosuka
Allison Richard D.
Rimell Sam
Sherwood Medical Company
Smith Montgomery W.
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