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Catheter assembly

A technology for an assembly and a catheter body, which is applied to catheters, guiding needles, and instruments introduced into the body, etc., can solve the problems of inability to perform blood suction, and the inner needle is easily flexed, and achieves restraint of deflection, restraint damage, and restraint. Effect of Variation in Sliding Resistance

Active Publication Date: 2020-07-24
TERUMO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the case of using a catheter assembly for infusion or hemodialysis, if the tip of the catheter sticks to the wall of the blood vessel or the tip of the catheter is crushed during blood suction, blood cannot be pumped
In addition, for example, when a catheter assembly equipped with a relatively long catheter is punctured on a patient for intravenous infusion, the inner needle tends to bend easily.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0062] Such as figure 1 and figure 2 As shown, the catheter assembly 10A of the first embodiment includes: a catheter 12; a catheter sheath 14 connected to the base end side of the catheter 12; an inner needle 16 having a sharp needle point 17 at the front end and inserted through the catheter 12; The needle cover 18 is connected to the inner needle 16; and the deflection suppressing mechanism 20 suppresses deflection of the inner needle 16 at the time of puncturing.

[0063] In the catheter assembly 10A, the user (doctor, nurse, etc.) grips the needle sheath 18 and punctures the patient's blood vessel with the distal end thereof. In an initial state before use (before puncturing a patient), catheter assembly 10A has a double-tube structure in which inner needle 16 is inserted through catheter 12 , and inner needle 16 protrudes from the distal end of catheter 12 by a predetermined length.

[0064] figure 1 Catheter assembly 10A in an initial state shown in the figure const...

no. 2 approach

[0099] Figure 5 The catheter assembly 10B of the second embodiment shown includes: a catheter 60; a catheter sheath 62 connected to the catheter 60; a catheter operation member 64 connected to the catheter sheath 62; an inner needle 66 inserted into the catheter 60; a sheath 68, which is attached to the inner needle 66; and a deflection suppressing mechanism 70, which suppresses deflection of the inner needle 66 at the time of puncturing.

[0100] The catheter 60 is a flexible thin-diameter tubular member. The catheter 60 has: a lumen 60 a penetrating in the axial direction; a distal opening 60 b opened at the distal end of the catheter 60 ; and a proximal opening opened at the proximal end of the catheter 60 . In an initial state before use (before puncturing a patient), the catheter assembly 10B has a double-tube structure in which the inner needle 66 is inserted through the catheter 60 , and the inner needle 66 protrudes from the distal end of the catheter 60 by a predete...

no. 3 approach

[0124] Such as Figure 8 As shown, the catheter assembly 10C includes: a catheter 82; a catheter sheath 84, which fixes and holds the catheter 82; a catheter operation member 86, which is mounted on the catheter sheath 84; and a hollow needle 88, which can be inserted into the catheter in a detachable manner. 82; a needle cover 89, which fixes and holds the inner needle 88; and a deflection suppression mechanism 90, which suppresses the deflection of the inner needle 88 during puncturing. Catheter Assembly 10C in Figure 8 In the shown initial state before use, the multilayer tube structure (multilayer tube part) in which the catheter 82 and the inner needle 88 overlap is formed.

[0125] The catheter 82 is a flexible thin-diameter and elongated tubular member. The catheter 82 has: a lumen 82 a penetrating in the axial direction; a front end opening 82 b opened at the front end of the catheter 82 ; and a base end opening opened at the base end of the catheter 82 . The diame...

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PUM

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Abstract

A catheter assembly (10A) is provided with a catheter (12), an internal needle (16), and a warp suppressing mechanism (20) which suppresses warping of the internal needle (16). The catheter (12) includes a peripheral wall portion having a lateral flow passageway structure (22) including at least one liquid passageway. The warp suppressing mechanism (20) includes a slidable-contact supporting portion (54) configured to slidably support the catheter (12) when the catheter (12) is advanced relative to the internal needle (16). In an initial state, the slidable-contact supporting portion (54) is positioned on the proximal end side of the liquid passageway which is positioned on the most-distal-end side of the lateral flow passageway structure (22).

Description

technical field [0001] The present invention relates to a catheter assembly for puncturing a blood vessel and indwelling a catheter for, for example, infusion of a patient or hemodialysis for a patient. Background technique [0002] Conventionally, catheter assemblies have been used, for example, to perform infusions, hemodialysis, and the like on patients. Such a catheter assembly includes a catheter, a catheter sheath fixed to a proximal end of the catheter, an inner needle inserted into the catheter, and a needle sheath fixed to the proximal end of the inner needle (for example, Japanese Patent No. 5108882). In use of the catheter assembly, the catheter is punctured into the patient's blood vessel together with the inner needle, and after the puncture, the inner needle is pulled out from the catheter while the catheter is being punctured into the patient. Thus, the catheter is indwelled in the patient's blood vessel. [0003] When a catheter assembly is used for infusio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M25/06A61M1/36
CPCA61M25/005A61M25/008A61M25/06A61M25/0606A61M25/065A61M1/14A61M1/36A61M5/158A61M5/3286A61M5/3293A61B5/150992A61M1/3661A61M2005/1585A61M1/16A61M25/0693
Inventor 石田昌弘
Owner TERUMO KK
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