JP2010000276A - Indwelling needle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indwelling needle having improved maneuverability, being capable of storing the distal end of a needle section safely within a tube body, and preventing the tube body from hindering operation of the indwelling needle even when the distal end of the needle section is projected from the tube body. <P>SOLUTION: The indwelling needle 1 includes the hollow needle section 2 having the bent distal section, a hub 3, and the flexible tube body 51 for storing the distal end of the needle section 2. The hub 3 has a cylindrical section 32 extending forward, and the cylindrical section 32 has a slit 33 extending in the front and back directions. The tube body 51 receives the needle section 2 slidably within itself and is located on the rear end side of the needle section 2 within the cylindrical section 32. A sliding tube 52 for freely sliding the needle section 2 is arranged on the rear end of the tube body 51. The sliding tube 52 has an operating lever 54 exposed from the slit 33. A plurality of cuts 51a are formed in the outer top surface of the tube body 51. By moving the operation lever 54 forward, the tube body 51 receives the distal end of the needle section 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an indwelling needle comprising a hollow needle portion whose tip portion is bent downward, a hub provided at the rear end of the needle portion, and a flexible tube body that can accommodate the tip of the needle portion. About.

Conventionally, a needle part having a bent part in the middle and a tip part bent downward, a hub provided at the rear end of the needle part, and a slit-like cut part are exposed to the outside of the hub. An indwelling needle comprising a flexible tube body and a fixing member provided at the tip of the tube body, holding the fixing member and pulling it to the tip of the needle part, and accommodating the tip part of the needle part from the cutting part in the tube body Is known (see, for example, Patent Document 1). Thereby, a used indwelling needle can be safely discarded.
JP 2008-554 A

  In the conventional indwelling needle, the holding member provided at the tip of the tube body is gripped and pulled to the tip of the needle portion so that the needle portion is accommodated in the tube body, so that the hand holding the fixing member approaches the tip of the needle portion. There is a possibility that the tip of the needle portion may be stuck in the hand that erroneously grips the fixing member. For this reason, in the conventional indwelling needle, it was necessary to pull the fixing member while paying close attention, and the operability was poor.

  Further, in the conventional indwelling needle, when the tip of the needle portion is protruded from the tube body, the tube body is exposed to the outside of the hub. It becomes. In addition, the tube body is easily caught, and the indwelling needle may fall off the patient's body surface unintentionally.

  In view of the above points, the present invention improves operability, can safely accommodate the tip of the needle portion in the tube body, and the tube body can be used even when the tip of the needle portion protrudes from the tube body. An object is to provide an indwelling needle that does not get in the way.

  In order to achieve the above object, the present invention provides a hollow needle part having a bent part in the middle and a tip part bent downward, a hub provided at the rear end of the needle part, and a tip of the needle part. In an indwelling needle having a flexible tube body that can be accommodated, the hub is provided with a cylindrical portion that extends forward and covers the rear end of the needle portion, and the cylindrical portion is provided with a slit that extends in the front-rear direction. The tube body is slidably inserted into the needle portion, and is initially located in the tubular portion and on the rear end side of the needle portion, and at the rear end of the tube body, the needle portion is located in the tubular portion. A sliding cylinder that is slidable between the bent part and the rear end of the tube part is provided, and an operating lever that is exposed outward from the slit of the cylindrical part is provided on the sliding cylinder, and the upper outer surface of the tube body A plurality of cut portions are provided at intervals in the front-rear direction, and the operation lever is moved forward along the slit of the cylindrical portion. Wherein the cube body to accommodate the tip of the needle.

  According to the present invention, when the operation lever exposed from the hub is pushed forward, the tube body slides forward and the tip of the needle portion can be accommodated. For this reason, the hand which pushes an operation lever does not approach the front-end | tip of a needle part, and can accommodate and discard a needle part with a tube body more safely compared with the conventional one. In the initial state, the tube body is located in the cylindrical portion of the hub, and therefore the tube body does not get in the way when the indwelling needle of the present invention is placed on the patient.

  Here, when the tube body is slid forward, the tube body may be caught by the bent portion of the needle portion and cannot move forward, but in the present invention, there is an interval in the front-rear direction on the upper outer surface of the tube body. The tube body can be bent easily by opening the cut portion at the bent portion. Therefore, the tube body of the present invention can move forward smoothly without being caught by the bent portion of the needle portion.

  In the present invention, the tube body is provided with a blocking portion that closes the tip, and a hole is provided at a position eccentric to the central axis of the tube body at the tip of the tube body. When the tip of the needle is exposed so that the tip of the body is curved and the operating lever is advanced along the slit of the cylindrical body and the tip of the needle is pulled out of the hole of the tube body, It is preferable that the tip is accommodated in the tube body.

  According to such a configuration, since the tip of the needle part is exposed from the hole of the tube body, the tip of the tube body is in a curved state. When the operation lever is advanced to house the tip of the needle part in the tube body and the tip of the needle part comes out of the hole of the tube body, the tube body is released from the curved state due to its own elastic force. Thereby, the position of the tip of the needle part and the hole of the tube body is displaced, and the tip of the needle part can be prevented from protruding from the hole again.

  In the present invention, if the operation lever is moved forward along the slit of the cylindrical body and a retraction preventing mechanism for preventing the operation lever from retreating when the tip of the needle portion is accommodated in the tube body, the needle is provided. It can prevent more reliably that the front-end | tip of a part protrudes from a tube body again.

  An embodiment of the indwelling needle of the present invention will be described with reference to FIGS. The indwelling needle of the embodiment is a so-called Huber needle and punctures an access port of a subcutaneously implantable catheter, for example. As shown in FIG. 1, the indwelling needle 1 of the embodiment includes a hollow needle portion 2 and a hub 3 provided at the rear end of the needle portion 2. An infusion tube 4 is connected to the rear end of the hub 3, and nutrients and the like supplied from the infusion tube 4 are supplied to the patient via the hub 3 and the needle portion 2.

  The needle part 2 has a bent part 2a in the middle, and the tip part is bent at about 90 degrees downward. A blade portion 2 b is provided at the tip of the needle portion 2. The hub 3 includes a hub body 31 that is connected to the rear end of the needle portion 2 and supports the needle portion 2, and a cylindrical portion 32 that extends from the front end of the hub body 31 toward the needle portion 2 side. A slit 33 is formed on the peripheral surface of the cylindrical portion 32 and extends laterally so as to be located on the side.

  In the cylindrical part 32, the flexible tube body 51 which inserts the needle part 2 is arrange | positioned. A sliding cylinder 52 is connected to the rear end of the tube body 51. The sliding cylinder 52 is provided with an operation lever 54 exposed from the slit 33 of the cylindrical part 32 through the connection part 53 to the outside of the cylindrical part 32.

  The slit 33 is formed with a first narrow portion 33 a located on the rear end side and a second narrow portion 33 b located on the front end side. Both narrow portions 33 a and 33 b are larger than the width of the connection portion 53. It is set narrowly. The front end side and the rear end side of the first narrow portion 33a are inclined, and the first narrow portion 33a holds the operation lever 54 at the rear end position (the initial position) of the slit 33 so as to be releasable. Engage with the front side surface of the connecting portion 53.

  Thereby, it can suppress that the operation lever 54 is moved forward unintentionally. Even if the operating lever 54 is accidentally moved forward and the engagement between the front side surface of the connecting portion 53 and the first narrow portion 33a is released, the first width is reduced on the rear side surface of the connecting portion 53. The operation lever 54 can be retracted to the rear end position of the slit 33 by pushing the narrow portion 33a.

  Further, the rear end side of the second narrow portion 33b is inclined, and the advancement of the operation lever 54 is allowed so that the connecting portion 53 spreads the second narrow portion 33b. The front end side of the second narrow portion 33 b is a stepped portion, and after the one end operation lever 54 has advanced to the front end position of the slit 33, the step portion on the front end side of the second narrow portion 33 b is the connecting portion 53. The rear side surface is locked to prevent the operation lever 54 from retreating. That is, the stepped portion on the front end side of the second narrow portion 33b of the embodiment corresponds to the backward movement prevention mechanism of the present invention.

  On the upper outer surface of the tube body 51, a plurality of cut portions 51 a are formed that are cut in the semicircular shape to the inner peripheral surface with a space in the front-rear direction. The distal end of the tube body 51 is closed by a closing portion 51b formed by thermocompression bonding. In addition, a hole 51 c is provided in the peripheral wall at the tip of the tube body 51. That is, the hole 51 c is eccentric with respect to the central axis of the tube body 51. The needle portion 2 is inserted into the hole 51 c so as to push and bend the distal end portion of the tube body 51 upward, and the distal end portion of the needle portion 2 is exposed to the outside of the tube body 51. A cylindrical cover 6 is provided at the tip of the needle portion 2 and covers the blade portion 2b.

  When using the indwelling needle 1 of the embodiment, the cover 6 is removed, and the tip of the needle part 2 is placed by puncturing, for example, an access port of a subcutaneous implantable catheter. When discarding the used indwelling needle 1, the operation lever 54 is advanced along the slit 33. When the operation lever 54 is moved forward, the tube body 51 is also moved forward via the connecting portion 53 and the sliding cylinder 52. At this time, as shown in FIG. 2, the tube body 51 can be bent easily by opening the notch 51a at the bent portion 2a. Therefore, the tube body 51 can be easily slid along the needle portion 2 without being caught by the bent portion 2 a of the needle portion 2.

  When the operation lever 54 is advanced to the front end position of the slit 33, the rear side surface of the connection portion 53 that has passed over the second narrow portion 33b is locked to the step on the front side surface of the second narrow portion 33b. Retreat is prevented from being canceled. At this time, as shown in FIG. 3, the distal end of the needle part 2 comes out of the hole 51 c of the tube body 51, and the curved state of the distal end part of the tube body 51 is released by its own elastic force. The part is accommodated in the tube body 51. Since the hole 51c is eccentric with respect to the central axis of the tube body 51, the blade part 2b of the needle part 2 does not protrude from the hole 51c to the outside of the tube body 51 again.

  Thus, the needle part 2 can be easily covered with the tube body 51 by the operation on the hub 3 side, and the indwelling needle can be discarded more safely than the conventional product. In the initial state, the tube body 51 is located in the cylindrical portion 32 of the hub 3, so that the tube body 51 does not get in the way when the indwelling needle 1 is placed in the patient. Further, by making the blocking portion 51b thick, it is possible to prevent the tip of the needle portion 2 from being exposed through the blocking portion 51b.

  In the embodiment, the cut portion 51a reaches the inner peripheral surface of the tube body 51. However, if the tube body 51 can slide smoothly without being caught by the bent portion 2a, the cut portion 51a does not need to reach the inner peripheral surface of the tube body 51.

Explanatory drawing which shows embodiment of the indwelling needle of this invention. Explanatory drawing which shows the state which advanced the operation lever of the indwelling needle of embodiment. Explanatory drawing which shows the state which accommodated the front-end | tip part of the needle part in the tube body of the indwelling needle of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Indwelling needle, 2 ... Needle part, 2a ... Bending part, 2b ... Blade part, 3 ... Hub, 31 ... Hub main body, 32 ... Cylindrical part, 33 ... Slit, 33a ... 1st narrow part, 33b ... 1st 2 narrow part, 4 ... infusion tube, 51 ... tube body, 51a ... notch part, 51b ... closed part, 51c ... hole, 52 ... sliding cylinder, 53 ... connecting part, 54 ... operating lever, 6 ... cover .

Claims (3)

A hollow needle portion having a bent portion in the middle and a tip portion bent downward, a hub provided at the rear end of the needle portion, and a flexible tube body that can accommodate the tip of the needle portion. In the indwelling needle provided,
The hub is provided with a cylindrical portion that extends forward and covers the rear end of the needle portion, and the cylindrical portion is provided with a slit that extends in the front-rear direction.
The tube body is slidably inserted into the needle portion, and is in the cylindrical portion in the initial state and located on the rear end side of the needle portion,
At the rear end of the tube body, a sliding cylinder is provided that is slidable between the bent part of the needle part and the rear end within the cylindrical part,
The sliding cylinder is provided with an operation lever that is exposed outward from the slit of the cylindrical portion,
A plurality of incisions are provided on the upper outer surface of the tube body at intervals in the front-rear direction,
An indwelling needle characterized in that the tube body accommodates the tip of the needle portion by advancing the operation lever along the slit of the cylindrical portion.   2. The indwelling needle according to claim 1, wherein the tube body includes a closing portion that closes the distal end, and a hole portion is provided at a position eccentric to the central axis of the tube body at the distal end portion of the tube body. The tip of the needle is exposed so that the tip of the tube body is bent from the position of the needle, and when the operation lever is advanced along the slit of the cylindrical body and the tip of the needle is pulled out of the hole of the tube body, the needle An indwelling needle characterized in that the tip of the part is accommodated in the tube body.   The indwelling needle according to claim 1 or 2, wherein when the operation lever is advanced along the slit of the cylindrical body and the tip of the needle portion is accommodated in the tube body, the retraction prevention mechanism prevents the operation lever from retreating. An indwelling needle characterized by comprising: