WO2019244354A1

WO2019244354A1 - Cannula device

Info

Publication number: WO2019244354A1
Application number: PCT/JP2018/023857
Authority: WO
Inventors: 達夫斉藤; ホンソクリン
Original assignee: 株式会社日本生物製剤
Priority date: 2018-06-22
Filing date: 2018-06-22
Publication date: 2019-12-26

Abstract

According to one embodiment of the present invention, the cannula device comprises a cannula having a blunt end, and an auxiliary needle having a sharp end and a groove formed from the sharp end along the longitudinal direction. The cannula is accommodated in the groove.

Description

Cannula device

の一 One aspect of the present invention relates to a cannula device.

装置 Devices for inserting a cannula under the skin are known. For example, U.S. Pat. No. 6,037,064 describes an apparatus with a central body provided with a groove and having a sharp distal tip. The groove is arranged to slide the cannula over the distal tip along the groove.

JP-T-2017-522995

用いる When using the above device, the user has to set the cannula to the device, so that the operation for inserting the cannula into the body from the skin is troublesome. Therefore, a mechanism that allows the cannula to be more easily inserted into the body from the skin is desired.

A cannula device according to one aspect of the present invention includes a cannula having a blunt end, an auxiliary needle having a sharp end and a groove formed along the longitudinal direction from the sharp end, and the cannula is housed in the groove. Is done.

In such a side surface, the cannula is accommodated in the groove of the auxiliary needle, so that the cannula and the auxiliary needle can be handled integrally. Since the auxiliary needle has a sharp end, the auxiliary needle containing the cannula can be inserted into the skin as it is, and the cannula can be inserted under the skin. With this mechanism, the cannula can be more easily inserted into the body from the skin.

According to one aspect of the present invention, a cannula can be more easily inserted from the skin into the body.

It is a perspective view of a cannula device concerning an embodiment. FIG. 2 is an exploded perspective view of the cannula device according to the embodiment. It is an enlarged view of the tip of the cannula device concerning an embodiment. FIG. 4 is a sectional view taken along line IV-IV of FIG. 1. It is a figure showing how to use a cannula device concerning an embodiment. It is a figure showing how to use a cannula device concerning an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference symbols, without redundant description.

[Configuration of Cannula Device]
The configuration of the cannula device 1 according to the embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of the cannula device 1. FIG. 2 is an exploded perspective view of the cannula device 1. FIG. 3 is an enlarged view of the tip of the cannula device 1. FIG. 4 is a sectional view taken along line IV-IV of FIG.

The cannula device 1 is an instrument for inserting a cannula under the skin of a living body. The target to which the cannula device 1 is applied is not limited, and may be, for example, a human or an animal. The purpose of use of the cannula device 1 is not limited. For example, the cannula device 1 may be used for medical operations such as arbitrary surgery, treatment, and diagnosis. The function of the cannula device 1 is not limited, and may be, for example, administration of an active ingredient into a body, discharge of a body fluid, and the like. Specific uses of the cannula device 1 include, but are not limited to, intra-articular injection and cerebrospinal fluid collection.

The cannula device 1 includes a cannula 10, an auxiliary needle 20, and a stopper 30.

The cannula 10 is an elongated tube inserted into the body. The cannula 10 may be placed intradermally for a predetermined period of time (eg, 6, 10, 12, or 24 hours). The cannula 10 includes a blunt end (distal end) 11 to be inserted into the body, a proximal end 12 opposite to the blunt end 11, and a side surface 13 connecting the blunt end 11 and the proximal end 12. A blunt end refers to an end processed so that the outer surface is not sharp. In the present embodiment, the outer surface of the blunt end 11 is formed in a hemispherical shape. However, the specific shape of the blunt end 11 is not limited to a hemisphere, and may be, for example, a chamfered shape.

小さな A small opening 14 is formed at the side surface 13 slightly away from the blunt end 11. The opening 14 is in communication with a conduit of the cannula 10 and functions as an outlet for discharging a substance supplied from the conduit out of the cannula 10 or a conduit for the substance outside the cannula 10. Functions as an inlet for guiding to the road. In the present embodiment, the opening 14 has an elongated shape extending along the longitudinal direction of the cannula 10, but the shape of the opening 14 is not limited to this, and may be arbitrarily determined.

コネクタ A connector 40 is provided at the base end 12. The connector 40 is a component for connecting the cannula 10 to another device or device (for example, a syringe, a conduit, or the like). For example, the connector 40 may be formed of a resin such as polypropylene. The configuration attached to the proximal end 12 is not limited to the connector 40, and another configuration may be employed.

A scale 15 is provided on the side surface 13 of the cannula 10. The scale 15 is provided, for example, for the purpose of allowing an operator to know the length of the cannula 10 that has entered the body. However, the scale 15 is not an essential component and may be omitted.

The auxiliary needle 20 is a semi-cylindrical needle that assists in inserting the cannula 10 into the body. The auxiliary needle 20 has a groove 21 formed along the longitudinal direction from a tip capable of puncturing the skin. The cannula device 1 is used while the cannula 10 is accommodated in the groove 21. For example, the cannula 10 may be housed in the groove 21 in advance.

先端 The tip of the auxiliary needle 20 is a sharp end 22. The sharp end refers to an end processed to be sharp. In the present embodiment, when the auxiliary needle 20 is viewed in a plan view from the opening side of the groove 21, the sharp end 22 is formed to have a V-shape. The sharp end 22 allows the auxiliary needle 20 to pierce the skin.

The groove 21 is formed from the sharp end 22 to a base end 23 located on the opposite side of the sharp end 22. Accordingly, the auxiliary needle 20 has a shape in which a part of the side surface of the cylinder is cut from the acute end 22 to the proximal end 23 along the longitudinal direction. The inner wall of the groove 21 has a curved shape that is the inner side surface of the semi-cylinder. The cross-sectional shape of the inner wall obtained by cutting the auxiliary needle 20 along the radial direction of the auxiliary needle 20 has an arc shape (C shape). As shown in FIG. 4, the central angle θ of the cross-sectional shape of the arc-shaped groove 21 may be set to be larger than 180 °. By forming the groove 21 in this manner, the width of the opening of the groove 21 becomes smaller than the inner diameter of the groove 21, so that the cannula 10 can be more securely retained in the groove 21. The central angle θ may be any value between 240 ° and 300 °, specifically, any value between 260 ° and 280 °, and more specifically, 270 °. There may be. The central angle θ may be another arbitrary value, for example, 180 ° or less.

内径 In order to accommodate the cannula 10 in the groove 21, the inner diameter of the groove 21 is set to be equal to or larger than the outer diameter of the cannula 10. The width of the opening of the groove 21 may be substantially the same as the outer diameter of the cannula 10, and more specifically, may be the same as or slightly larger than the outer diameter of the cannula 10. Alternatively, the width of the opening of the groove 21 may be larger than the outer diameter of the cannula 10, for example, may be significantly larger than the outer diameter. Here, the “width of the opening of the groove” is a length of the opening in a direction orthogonal to the longitudinal direction of the groove 21, which is grasped when the auxiliary needle 20 is viewed from above the opening of the groove 21.

The depth of the groove 21 may be greater than the outer diameter of the cannula 10. By forming the groove 21 in this manner, the entire cannula 10 in the radial direction is accommodated in the auxiliary needle 20, so that a situation in which the cannula 10 hits the skin when the auxiliary needle 20 punctures can be avoided. However, the depth of the groove 21 is not limited to this. For example, when the cannula device 1 is viewed from the side, the depth of the groove 21 is set so that a part of the cannula 10 is slightly exposed from the auxiliary needle 20. May be set.

溝 In the longitudinal direction of the auxiliary needle 20, the groove 21 accommodates at least a part of the cannula 10 and accommodates at least a part including the blunt end 11. Therefore, when the cannula 10 is received in the groove 21, the blunt end 11 is located closer to the base end 23 than the sharp end 22. The length of the groove 21 along the longitudinal direction may be large enough to accommodate the entire cannula 10. Alternatively, a part of the cannula 10 (for example, a part of the cannula 10 including the proximal end 12) may not be accommodated in the groove 21 of the auxiliary needle 20.

The stopper 30 is a component for preventing the cannula 10 housed in the groove 21 of the auxiliary needle 20 from unintentionally coming out of the auxiliary needle 20 from the groove 21. The stopper 30 has a short cylindrical shape in which a part of the side surface is cut out along the longitudinal direction. As shown in FIG. 4, the cross-sectional shape obtained by cutting the stopper 30 along the radial direction of the stopper 30 has a C-shape. The inner diameter of the stopper 30 is substantially the same as the outer diameter of the auxiliary needle 20. The width of the notch 31 of the stopper 30 extending along the longitudinal direction is smaller than the outer diameter of the cannula 10, so that the stopper 30 covers at least a part of the groove 21. By setting the width of the notch 31 of the stopper 30 in this way, it is possible to prevent the unintended cannula 10 from jumping out of the auxiliary needle 20. Here, the “width of the notch of the stopper” refers to the length of the notch 31 in a direction orthogonal to the longitudinal direction of the stopper 30, which is grasped when the stopper 30 is viewed in plan from the side of the notch 31 of the stopper 30. That's it.

寸法 The size of the cannula device 1 is not limited at all, but may be set as follows, for example. The length of the cannula 10 may be any value between, for example, 15 mm and 100 mm, for example, between 15 mm and 20 mm, between 30 mm and 35 mm, between 45 mm and 50 mm, between 55 mm and 60 mm, or between 75 mm and 80 mm. Is also good. The position of the scale 15 is not limited. For example, the scale 15 may be provided every 10 mm from the blunt end 11. The outer diameter of the cannula 10 may be any value between 0.15 mm and 1 mm, for example, 0.18 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.65 mm, It may be 0.7 mm or 0.8 mm. The inner diameter of the cannula 10 may be any value between 0.1 mm and 0.9 mm, for example, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm , 0.55 mm, 0.6 mm, or 0.7 mm.

The radius of curvature of the blunt end 11 may be, for example, 0.08 mm to 0.5 mm, for example, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm Or 0.4 mm. The distance from the blunt end 11 to the opening 14 (more specifically, the distance from the blunt end 11 to the blunt end of the opening 14) may be, for example, 0.2 mm to 1 mm, for example, 0.25 mm , 0.3 mm, 0.6 mm, 0.7 mm, or 0.9 mm. The length of the opening 14 in the longitudinal direction may be, for example, 0.4 mm to 2 mm, for example, 0.6 mm, 1.0 mm, or 1.3 mm. The depth of the edge of the opening 14 (the distance from the blunt end (or the proximal end) of the edge of the opening 14 to the deepest portion of the edge in the radial direction of the cannula 10) is, for example, 0.05 mm to 0 mm. It may be 0.5 mm, for example, 0.06 mm, 0.1 mm, 0.2 mm, or 0.3 mm.

The length of the auxiliary needle 20 is set longer than the cannula 10, for example, may be set several millimeters longer than the cannula 10. For example, the length of the auxiliary needle 20 may be any value between 17 mm and 103 mm, for example, between 17 mm and 23 mm, between 32 mm and 38 mm, between 47 mm and 53 mm, between 57 mm and 63 mm, or between 77 mm and 83 mm. May be done. The inner diameter of the auxiliary needle 20 may be set in consideration of the accommodation of the cannula 10, and the outer diameter of the auxiliary needle 20 may be set in consideration of puncturing the skin.

The length of the stopper 30 is shorter than the lengths of the cannula 10 and the auxiliary needle 20, and may be, for example, 5 mm, 10 mm, or 20 mm.

材料 The material used for manufacturing the cannula device 1 is not limited. For example, the cannula 10 and the auxiliary needle 20 may be formed of stainless steel such as SUS304. The material of the stopper 30 may be selected so that, when the cannula device 1 is sterilized, a gas for sterilization also passes through a portion hidden by the stopper 30, and may be formed of, for example, polyurethane foam or polypropylene. .

[How to use the cannula device]
A method of using the cannula device 1 will be described with reference to FIGS. 5 and 6 are diagrams showing how to use the cannula device 1.

The user first prepares the cannula device 1. At this point, the cannula 10 is housed in the groove 21 of the auxiliary needle 20 and the stopper 30 is fitted in the auxiliary needle 20, so that the cannula 10 does not go out of the groove 21 out of the auxiliary needle 20. The user attaches a desired device to the connector 40 to connect the device to the cannula 10. 5 and 6, the syringe barrel 50 is connected to the cannula 10 via the connector 40.

When inserting the cannula 10 into the body, the user stabs the sharp end 22 of the auxiliary needle 20 into the skin of the living body B while maintaining the state in which the cannula 10 is housed in the groove 21 (see FIG. 5). ). The user pierces the skin with the auxiliary needle 20 at least until the blunt end 11 of the cannula 10 enters under the skin of the living body B, but the specific puncture depth is not limited. When a part of the cannula 10 including the blunt end 11 enters under the skin, the user removes the stopper 30 and removes the auxiliary needle 20 while maintaining the state of the cannula 10, and only the cannula 10 is removed from the body by this operation. (See FIG. 6). The timing for removing the stopper 30 is not limited. For example, the user may remove the stopper 30 before piercing the auxiliary needle 20 into the skin of the living body B. Thereafter, the user performs a desired treatment on the living body using the cannula 10.

[effect]
As described above, the cannula device according to one aspect of the present invention includes a cannula having a blunt end, an auxiliary needle having a sharp end, and a groove formed in the longitudinal direction from the sharp end, A cannula is received in the groove.

In the cannula device according to another aspect, the groove may be formed from the acute end to the proximal end of the auxiliary needle. By forming the groove over the entire length of the auxiliary needle, the structure of the auxiliary needle can be simplified, and the cannula can be securely accommodated in the groove of the auxiliary needle.

では In the cannula device according to another aspect, the groove may have a length that accommodates the entire cannula. By setting the length of the groove in this way, the entire cannula can be accommodated in the groove.

では In the cannula device according to another aspect, the cross-sectional shape of the groove along the radial direction of the auxiliary needle may be an arc. By setting the shape of the groove according to the shape of the side surface of the cannula, the cannula can be securely accommodated in the groove of the auxiliary needle.

では In the cannula device according to another aspect, the central angle of the arc-shaped cross-sectional shape of the groove may be larger than 180 °. By setting the shape of the groove in this manner, the width of the opening of the groove becomes smaller than the diameter of the groove, so that it is possible to suppress the cannula from unintentionally coming out of the auxiliary needle from the groove.

では In the cannula device according to another aspect, the depth of the groove may be greater than or equal to the outer diameter of the cannula. By setting the dimensions of the groove in this way, the entire cannula can be reliably accommodated in the groove.

カ The cannula device according to another aspect may further include a stopper covering at least a part of the groove accommodating the cannula. This stopper can prevent the cannula from unintentionally coming out of the auxiliary needle from the groove.

[Modification]
The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.

In the above embodiment, the groove 21 is formed from the acute end 22 to the proximal end 23 of the auxiliary needle 20, but this groove does not have to reach the proximal end of the auxiliary needle, and extends from the acute end 22 to the middle of the side surface of the auxiliary needle. Over the entire surface.

In the above embodiment, the cross-sectional shape of the groove 21 is an arc shape, but the cross-sectional shape of the groove is not limited to this, and may be, for example, a V-shape or a square box shape. Therefore, the inner wall of the groove may be not a curved surface but a combination of planar shapes. Alternatively, the inner wall of the groove may have a shape combining a curved surface and a flat surface.

ストッパ A stopper having a different structure from the stopper 30 in the above embodiment may be used. For example, the stopper may be a tape attached along the circumferential direction of the auxiliary needle.

DESCRIPTION OF SYMBOLS 1 ... Cannula device, 10 ... Cannula, 11 ... Blunt end, 12 ... Base end, 13 ... Side surface, 14 ... Opening, 15 ... Scale, 20 ... Auxiliary needle, 21 ... Groove, 22 ... Sharp end, 23 ... Base end, 30 ... stopper, 40 ... connector, 50 ... syringe.

Claims

A cannula having a blunt end;
An auxiliary needle having a sharp end and a groove formed along the longitudinal direction from the sharp end,
The cannula was received in the groove;
Cannula device.
The groove is formed from the sharp end to the base end of the auxiliary needle,
The cannula device according to claim 1.
The groove has a length to accommodate the entire cannula;
The cannula device according to claim 1.
The cross-sectional shape of the groove along the radial direction of the auxiliary needle is an arc shape,
The cannula device according to any one of claims 1 to 3.
A central angle of the arc-shaped cross-sectional shape of the groove is greater than 180 °;
The cannula device according to claim 4.
The depth of the groove is not less than the outer diameter of the cannula,
The cannula device according to any one of claims 1 to 4.
The cannula device according to any one of claims 1 to 6, further comprising a stopper covering at least a part of the groove accommodating the cannula.