JP2009254576A - Indwelling needle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indwelling needle device having a constitution preventing blood stagnation in an inner needle while securing a cross section area of a flow passage from a tube to the lumen of the outer needle. <P>SOLUTION: An inner needle 1 has an elongated opening 9 penetrating from its lumen to a periphery and formed along the longitudinal direction of the inner needle 11, when an end close to the distal portion of the inner needle out of the longitudinal both ends of the elongated opening 9 is defined as the distal-side end 9a and an end far therefrom is defined as a proximal-side end 9b, the distal-side end 9a of the elongated opening 9 is in the interior of lumen of the outer needle 8 in a state where the length of the inner needle 1 projecting from the distal portion of the outer needle 8 is the longest, and liquid flowing from the distal-side opening of the inner needle 1 is passed into a space formed between the peripheral face of the inner hub and the inner circumferential face of a shield via a space 16 formed between the inner circumferential face of the outer needle 8 and the inner needle 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an indwelling needle device having a shield for preventing erroneous puncture that can safely store a hard needle after use.

  Indwelling needle devices are widely used in the treatment of infusion, blood transfusion, extracorporeal blood circulation, and the like, and various configuration examples are known. For example, in an indwelling needle with a wing, the puncture needle is held at the tip of a hub having a wing, and an infusion tube is connected to the rear end of the hub. When performing the infusion, the wing portion is fixed to the patient's arm or the like with an adhesive tape or the like, and the puncture state of the puncture needle is maintained.

  On the other hand, in medical facilities, contamination / infection due to erroneous puncture such as a puncture needle is a problem. Therefore, in order to prevent accidental puncture accidents, a structure is known in which a cylindrical shield having wings is slidable with respect to a hub holding a puncture needle. In other words, by sliding the cylindrical shield, the puncture needle can be exposed and housed in the shield. When the puncture needle is discarded after use, the puncture needle is shielded. It can be stored by sliding in.

  Furthermore, because a blood vessel may be damaged by leaving a metallic puncture needle in the blood vessel, it is equipped with a soft outer needle and a hard inner needle, and after puncturing with the inner needle protruding from the outer needle A structure of an indwelling needle that enables the inner needle to be pulled from the outer needle is also known. Also in this case, in order to prevent erroneous puncture, it is possible to store the inner needle in the cylindrical shield in combination with the cylindrical shield as described above when the outer needle is indwelled. Is also known (see, for example, Patent Document 1).

  In such an indwelling needle having a cylindrical shield for preventing erroneous puncture, the tube is connected to a hub that holds the inner needle, and when the inner needle is pulled into the cylindrical shield, the tube is removed from the tube. The flow path leading to the needle lumen goes through the inner needle lumen. However, since the lumen of the inner needle has a small diameter, it is difficult to ensure a sufficient flow rate.

Therefore, in order to secure the flow rate, for example, as shown in FIG. 12, the hub 200 holding the inner needle 100 is formed with a transverse through passage 200e penetrating from the outer peripheral surface thereof to the lumen, and the outer peripheral surface of the hub 200 and the cylinder are formed. An indwelling needle device is disclosed in which a space 150 formed between the inner peripheral surface of the shield shield 400a communicates with the lumen of the hub 200 via the lateral through passage 200a. Thereby, since the space formed between the hub 200 and the cylindrical shield 400a functions as a flow path added to the flow path formed by the lumen of the inner needle 100, a larger flow rate can be secured. . Furthermore, if the hub lumen is made thicker than the lumen of the inner needle 100, a larger flow rate can be ensured as a whole than the flow path of the inner needle 100 only (for example, Patent Document 2). reference).
JP 2001-245980 A WO2006 / 100847

  However, in the indwelling needle device described in Patent Document 2, it is possible to secure a large flow rate as a whole by providing the hub 200 with the lateral through passage 200e communicating with the tube 300 through the lumen thereof. Is much larger than the lumen of the inner needle 100, so that most of the liquid supplied from the tube 300 is between the outer peripheral surface of the hub 200 and the inner peripheral surface of the cylindrical shield 400a via the lateral through passage 200e. Supplied to the space formed. Therefore, blood that has flowed into the inner needle at the time of puncture may stay in the inner needle 100 without being discharged out of the inner needle 100. If blood stays in the inner needle 100, the blood may coagulate in the inner needle 100 to form a thrombus, which is not preferable.

  The present invention provides an indwelling needle device having a configuration capable of preventing the retention of blood in the inner needle while ensuring the cross-sectional area of the flow path from the tube to the lumen of the outer needle.

A shield including a substantially cylindrical shield tube;
A soft outer needle fixed to the tip of the shield;
An inner hub inserted axially into the shield lumen and having a tube connected to its rear end;
A hard inner needle fixed to the distal end of the inner hub and insertable into the lumen of the outer needle,
When the inner hub is located at the tip of the lumen of the shield, the tip of the inner needle penetrates the lumen of the outer needle and protrudes to the outside, and the inner hub is projected to the rear end of the lumen of the shield. In the indwelling needle device that can be stored in the lumen of the shield by moving to the side,
The inner hub is formed with a horizontal through passage that penetrates from the outer periphery to the inner cavity, and a space formed between the outer peripheral surface of the inner hub and the inner peripheral surface of the shield passes through the horizontal through passage. Communicates with the lumen of the inner hub;
A sealing portion is provided on the outer peripheral surface of the inner hub on the rear end side of the lateral through-passage to maintain liquid tightness between the outer peripheral surface of the inner hub and the inner peripheral surface of the shield.
The inner needle has an elongated opening that penetrates from the lumen to the outer periphery and is formed along the longitudinal direction of the inner needle, and has an end close to the distal end of the inner needle among the longitudinal ends of the elongated opening. When the distal end is the distal end and the distal end is the proximal end, the distal end is in the lumen of the outer needle in the state where the inner needle protrudes from the distal end of the outer needle is the longest. ,
The liquid that can flow from the distal end side opening of the inner needle passes through the elongated opening and the outer peripheral surface of the inner hub through a space formed between the inner peripheral surface of the outer needle and the inner needle. It can flow into a space formed between the inner peripheral surface of the shield.

  ADVANTAGE OF THE INVENTION According to this invention, the indwelling needle apparatus of the structure which can prevent the residence of the blood in an inner needle can be provided, ensuring the cross-sectional area of the flow path from a tube to the lumen | bore of an outer needle.

  In a preferred example of the indwelling needle device of the present invention, when the inner needle is divided into two regions with the lower side at the time of puncturing as the lower part and the opposite side as the upper part, the elongated opening is at least in the lower part. Is formed.

  In a more preferred example of the indwelling needle device of the present invention, the elongated opening communicates the lumen of the inner needle with the outside of the inner needle at least at the lowest position of the lower part.

  In a preferred example of the indwelling needle device of the present invention, the proximal end of the elongated opening is in the vicinity of the inner hub.

  In a preferred example of the indwelling needle device of the present invention, the circumferential length of the cross section that is seen when the inner needle is cut in a direction perpendicular to the longitudinal direction at a portion having an elongated opening is assumed to have no elongated opening. It is 2/3 or less of the circumferential length of the cross section.

  In a preferred example of the indwelling needle device of the present invention, the inner peripheral surface of the distal end portion of the outer needle is in contact with the outer peripheral surface of the inner needle, and the inner peripheral surface of the outer needle is closer to the proximal end side than the distal end portion of the outer needle. And the outer peripheral surface of the inner needle are separated from each other. In this case, it is preferable that the distal end side end of the elongated opening is in the vicinity of the portion in contact with the inner peripheral surface of the distal end portion of the outer needle and is located on the proximal end side from the closely contacted portion.

  A preferred example of the indwelling needle device of the present invention further includes an inner hub movement control member detachably attached to the shield. The inner hub movement control member is inserted from the rear end side of the shield so that it can be inserted into and removed from the shield lumen. When the inner needle protrudes from the distal end of the outer needle for the longest length, the inner hub movement control member contacts the inner hub. And a holding portion capable of holding a state in which the tip of the stopper portion is in contact with the inner hub. The holding portion includes a pair of cantilever portions that are coupled to the rear end portion of the stopper portion and can grip the shield by reducing both distances by gripping both from both sides.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a cross-sectional view along the axial direction of an example of the indwelling needle device of the present invention, and FIG. 2 is another cross-sectional view along the axial direction of the indwelling needle device shown in FIG. 3 is a cross-sectional view showing a state in which the inner needle of the indwelling needle device shown in FIG. 1 is drawn into the cylindrical shield, and FIG. 4 shows the inner needle of the indwelling needle device shown in FIG. It is other sectional drawing which shows the state drawn in.

  As shown in FIGS. 1-4, the inner needle 1 is being fixed to the front-end | tip part of the resin-made inner hubs 2, for example. The inner needle 1 is, for example, a metal hollow needle. A tube 3 is connected to the rear end of the inner hub 2. The shield 4 includes, for example, a shield cylinder 4a having a substantially cylindrical shape made of resin, and an outer hub 7 fixed to the tip of the shield cylinder 4a. The inner needle 1 and the inner hub 2 are inserted into the lumen of the shield 4 and are movable in the axial direction. As the material of the shield 4, for example, polycarbonate and polypropylene can be used, and as the material of the inner hub 2, for example, polycarbonate can be used.

  A cylindrical outer needle 8 is fixed in the inner cavity of the outer hub 7. The inner needle 1 is inserted into the lumen of the outer needle 8, and a part of the outer needle 8 protrudes from the distal end of the inner needle 1 in the state shown in FIGS. 3 and 4. The outer needle 8 is formed of a resin material, for example, a polyurethane elastomer.

  An enlarged perspective view of the structure of the inner hub 2 is shown in FIG. As shown in FIG. 5, the inner hub 2 includes a front part 2a, a rear part 2b, and an intermediate part therebetween. According to FIG. 3 and FIG. 3, 4, the space between the outer peripheral surface of the front portion 2 a and the inner peripheral surface of the shield 4 is intermediate between the inner hub 2 via the lateral through passage 2 e formed in the front portion 2 a. The form which is connected with the lumen 10 in the rear part and the rear part 2b can be seen.

  As shown in FIGS. 1 to 5, the inner needle 1 is mounted in the lumen of the front portion 2 a. The rear portion 2b includes a plurality of elastic pieces 21b supported by the distal end side 21a (see FIG. 5) of the rear portion 2b, and a tube connecting portion 21d (see FIGS. 1 to 4). The plurality of elastic pieces 21b are arranged along the circumferential direction, away from the tube connection portion 21d, outside the tube connection portion 21d, and the plurality of elastic pieces 21b and the tube connection portion 21d are concentrically formed. Has been placed. The tube 3 is attached to the tube connecting portion 21d. The plurality of elastic pieces 21b are arranged at regular intervals along the circumferential direction, for example. The diameter of the lumen 10 (see FIGS. 1 to 4) in the intermediate part and the rear part 2b is preferably set to be larger than the outer diameter of the inner needle 1 and equal to or smaller than the inner diameter of the tube 3, for example. .

  As shown in FIGS. 1 to 5, a sealing annular recess 2 c is formed on the outer peripheral surface of the intermediate portion of the inner hub 2. The sealing annular recess 2c is formed on the front end side with respect to a locking recess 21c to be described later and on the rear end side with respect to the lateral through passage 2e, and the O-ring 11 is attached to form a sealing portion. ing. With this configuration, liquid tightness between the outer peripheral surface of the inner hub 2 and the inner peripheral surface of the shield 4 is maintained.

  As shown in FIGS. 1 to 4, an annular locking convex portion 12 b is provided on the rear end side on the inner peripheral surface of the shield tube 4 a so as to correspond to a locking concave portion 21 c described later. On the other hand, as shown in FIGS. 1 to 5, the engagement recesses that can be engaged with the annular engagement protrusions 12 b on the inner peripheral surface of the shield 4 are formed on the surfaces of the elastic pieces 21 b facing the inner peripheral surface of the shield 4. 21c is formed. Thereby, when the inner hub 2 is moved to the rear end side of the shield 4, the inner needle 1 is completely drawn into the shield 4, and the annular locking projection 12b is engaged with the engagement recess 21c. The inner hub 2 can be held by the shield 4 so as not to move in the shield 4.

  In the initial state shown in FIGS. 1 and 2, the inner needle 1 protrudes from the outer needle 8 and can be punctured. In this state, the front portion 2 a of the inner hub 2 is fitted in the inner cavity of the outer hub 7. Therefore, the space formed between the outer surface of the inner hub 2 and the inner surface of the shield 4 in this initial state can be minimized. After puncturing the outer needle 8 and the inner needle 1 in this state, the inner needle 1 is retracted so as not to protrude from the outer needle 8 as shown in FIGS. To.

  In the state shown in FIGS. 3 and 4, the front portion 2 a of the inner hub 2 is detached from the outer hub 7, so that a space 14 is formed between the outer peripheral surface of the front portion 2 a and the inner peripheral surface of the shield 4. Yes. This space 14 communicates with the lumen of the outer needle 8 via a space 15 formed between the inner needle 1 and the inner peripheral surface of the shield 4. Further, the space 14 communicates with the inner cavity 10 in the intermediate portion and the rear portion 2b of the inner hub 2 through the lateral through passage 2e. Thereby, since the space 14 formed between the inner hub 2 and the shield 4 functions as a flow path, a large flow rate can be secured.

  In the state of FIG. 3 and FIG. 4, the inner hub 2 is held with respect to the shield tube 4 by the engagement of the locking recess 21 c and the rear end side locking projection 12 b. Since the inner needle 1 is housed in the shield 4, the risk of erroneous puncture is sufficiently reduced. The engagement between the locking recess 21c and the rear end locking protrusion 12b functions to prevent the inner needle 1 from re-projecting.

  Usually, the indwelling needle device is used in the state shown in FIGS. The puncturing operation is performed by holding the shield tube 4a.

  Next, an example of the structure of the inner needle 1 will be described with reference to FIGS. 6 is an enlarged plan view of an example of an inner needle and an example of an outer needle, FIG. 7 is a sectional view taken along line VII-VII in FIG. 6, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

  As shown in FIGS. 6 and 7, for example, the inner diameter and the outer diameter of the distal end portion 8 a of the outer needle 8 are reduced toward the distal end of the outer needle 8, and at least the inner surface of the distal end portion 8 a of the outer needle 8 is at least. It is preferable that a part is in contact with the outer peripheral surface of the inner needle 1. Thus, it is preferable that the inner peripheral surface of the distal end portion of the outer needle 8 and the outer peripheral surface of the inner needle 1 are in close contact with each other because good puncture properties can be secured. The inner diameter of the outer needle 8 on the rear end side of the portion in contact with the inner needle 1 is slightly larger than the outer diameter of the inner needle 1.

  As shown in FIG. 7, the inner needle 1 has an elongated opening 9 penetrating from the outer periphery to the lumen and formed along the longitudinal direction. Therefore, when the inner needle 1 is in the outer needle 8 (see FIGS. 1 and 2), the lumen of the inner needle 1 and the lumen of the outer needle 8 communicate with each other via the elongated opening 9. When 1 is retracted into the shield 4 (see FIGS. 3 and 4), the lumen of the shield 4 and the lumen of the inner needle 1 are communicated via the elongated opening 9.

  When the patient is punctured with the inner needle 1 and the outer needle 8 in the state as shown in FIG. 1 and FIG. 2, blood passes from the distal end side opening of the inner needle 1 through the lumen into the lumen of the inner hub 2. Inflow. Therefore, the space 13 between the inner peripheral surface of the inner needle 1, the outer needle 8, the inner hub 2, the tube 3, the inner hub 2 and the outer peripheral surface of the inner hub 2 and the inner peripheral surface of the shield 4 by a priming operation described later (see FIG. 9). The physiological saline or the like filled in () is pushed back to the tube 3 side by blood. When the inner needle 1 is drawn into the shield 4 and the indwelling needle device is brought into a state as shown in FIGS. 3 and 4, blood is generated in the space 15 and the space 14 generated by drawing the inner needle 1 into the shield 4. Flow into.

  In this way, after the patient is punctured only with the outer needle 8, it is connected to the tube 3, and from the container (not shown) in which a liquid such as physiological saline is stored through the tube 3 and the inner hub 2. The liquid is supplied to the spaces 14 and 15 in the hub. By this operation, the blood filled in the lumen 10 of the inner hub 2, the lateral through-passage 2 e, and the spaces 14 and 15 in the inner hub flows back to the patient and returns to the lumen 10 of the inner hub 2. The lateral through passage 2e and the spaces 14 and 15 in the inner hub are filled with the liquid. Of the total length in the longitudinal direction of the inner needle 1, the movement of the blood in the lumen of the inner needle 1 to the space 15 is easily performed due to the presence of the elongated opening 9. Therefore, the blood staying in the portion of the inner needle 1 where the elongated opening 9 is formed is also returned to the patient together with the blood in the space 15. Therefore, the amount of blood staying in the lumen of the inner needle 1 can be reduced, and as a result, the risk of blood coagulating in the inner needle 1 and forming a thrombus amount can be reduced.

  When the inner needle 1 and the outer needle 8 are punctured into the patient, that is, when the amount of protrusion of the inner needle 1 from the distal end of the outer needle 8 is the largest, the distal end 9a of the elongated opening 9 is the outer needle. 8, after the inner needle 1 was inserted into the blood vessel and before the outer needle 8 was inserted into the blood vessel, it flowed into the lumen of the inner needle 1 from the opening on the distal end side of the inner needle 1. Blood leakage that leaks out of the outer needle 8 through the elongated opening 9 is prevented.

  If the elongated opening 9 is in a state in which the amount of the inner needle 1 protruding from the tip of the outer needle 8 is the largest, the elongated opening 9 can be configured as long as it does not cause the blood leakage and can exert the blood retention suppressing effect. For example, the distal end 9a of the elongated opening 9 is in the lumen of the outer needle 8 in the state where the inner needle protrudes from the distal end of the outer needle and has the longest length. It is preferable that it is in the vicinity of a portion in contact with the inner peripheral surface of the distal end portion 8a of the needle 8 and on the proximal end side with respect to the contacted portion. On the other hand, as shown in FIG. 9, the proximal end 9 b of the elongated opening 9 is preferably outside the lumen of the inner hub 2 and as close to the distal end of the inner hub 2 as possible. The reasons are as follows.

  The farther the distal end 9a of the elongated opening 9 is from the distal end of the inner needle 1, the more blood is retained in the lumen on the distal end side than the portion where the elongated opening 9 of the inner needle 1 is formed. Therefore, it is preferable that the distal end 9 a of the elongated opening 9 be as close as possible to the distal end of the outer needle 8 in the state where the inner needle 1 protrudes from the distal end of the outer needle 8 to the longest length. Further, the farther the proximal end 9a of the elongated opening 9 is from the proximal end of the inner needle 1, the more the blood stays in the lumen on the rear end side than the portion where the elongated opening 9 of the inner needle 1 is formed. The amount increases. Further, a part of the proximal end side of the inner needle 1 is inserted into the distal end side lumen 2 f that penetrates the distal end side in the axial direction from the lateral through passage 2 e of the inner hub 2 and is fixed to the distal end portion of the inner hub 2. However, in consideration of easiness of fixing to the inner hub 2 and the like in the part of the proximal end side of the inner needle 1 disposed in the inner cavity of the inner hub 2, the elongated opening 9 is not formed. Is preferred. Therefore, it is preferable that the rear end side end 9b of the elongated opening 9 is located outside the lumen of the inner hub 2 and as close to the inner hub 2 as possible.

  As shown in FIG. 8, the circumferential length of the cross section seen when the inner needle 1 is cut in a direction perpendicular to the longitudinal direction at the location having the elongated opening 9 ensures the strength required for the inner needle 1, and There is no limitation as long as the blood that has flowed into the lumen of the inner needle 1 diffuses well into the physiological saline or the like. For example, the length in the circumferential direction of the cross section when it is assumed that the elongated opening 9 is not provided. It is preferably 2/3 or less, more preferably 1/2 or less, even more preferably 1/3 or less, and even more preferably 1/4 or less.

  As shown in FIGS. 6 and 7, in an example of the indwelling needle device of the present invention, the cutting edge of the inner needle 1 includes a pair of first inclined surfaces 1a and a pair of second inclined surfaces 1b. . The first inclined surface 1 a is formed at a predetermined angle with respect to the longitudinal direction of the inner needle 1 and reaches the tip 1 d of the inner needle 1. When the inner needle 1 is divided into two regions with the side facing the skin when puncturing, that is, the lower side being the lower part and the opposite side being the upper part, the elongated opening 9 is formed at least in the lower part. In particular, it is preferable that the elongated opening 9 communicates the lumen of the inner needle 1 with the outside of the inner needle 1 at least at the lowest position of the lower part. The reason is as follows.

  The blood in the lumen of the portion where the elongated opening 9 of the inner needle 1 is formed moves to the space 15 formed between the inner needle 1 and the inner peripheral surface of the shield 4 by gravity, so that the elongated opening is formed. 9 is formed in the lower part of the inner needle 1, the elongated opening 9 of the inner needle 1 is formed without performing an operation for rotating the inner needle 1 about its axis in the shield 4. Blood in the lumen of the part can be moved to the space 15.

  By the way, when the “priming operation” in which the inside of the indwelling needle device is filled with physiological saline or the like is performed, it is performed in an initial state where the inner hub 2 is positioned on the distal end side inside the shield 4. In the example of the indwelling needle device of the present invention described with reference to FIG. 9, the tube lumen, the rear end side lumen 10 of the inner hub 2, the lateral through passage 2 e, the space 13, and the inner surface of the outer needle 8 Through the gap 16 (see FIG. 7) between the inner needle 1 and the outer peripheral surface in this order, physiological saline is mainly introduced into the outer needle 8 and the tube lumen, the rear end side of the inner hub 2 By passing the lumen 10, the lateral through passage 2e, and the distal end side lumen 2f in this order, the physiological saline is mainly flowed into the inner needle 1, and the physiological flow is filled in these flow paths. The air in the road can be discharged.

  Further, in the example of the indwelling needle device of the present invention, it is necessary to draw the inner needle 1 into the shield 4 with the outer needle 8 reaching the blood vessel. In the indwelling needle device of the present invention, the inner lumen 1c (see FIG. 7) that the inner needle 1 has on the tip side of the elongated opening 9 and the space 13 (see FIG. 9) can communicate with each other. A part of the blood flowing in from the distal end side opening of the needle 1 flows into the shield 4 through the elongated opening 9 and the gap 16, but most of the blood flowing from the distal end side opening of the inner needle 1 is in the inner hub. 2 flows into the tube 3 through the front end side lumen 2f, the lateral through passage 2e, and the rear end side lumen 10 (flashback). The blood flowing into the tube 3 can be visually confirmed from the outside of the shield 4. Thereby, it can confirm visually by the flashback of the blood that the outer needle 8 ensured the blood vessel.

  In order to place the outer needle 8 after the puncture of the inner needle 1 and the outer needle 8, a force for pulling the inner hub 2 into the shield tube 4a through the tube 3 is applied, and the state shown in FIGS. . That is, the engagement recess 21c and the rear end side engagement projection 12b are engaged. Thereby, the inner needle 1 is pulled out from the blood vessel, and only the outer needle 8 is punctured.

  Further, when the indwelling needle device is discarded, erroneous puncture can be prevented as long as it is in the state shown in FIGS. That is, since the inner needle 1 is housed in the shield 4 and the inner needle 1 is prevented from re-projecting by the engagement of the locking recess 21c and the rear end locking protrusion 12b. is there.

  In yet another example of the indwelling needle device of the present invention, the shield 4 may be a shield with wings provided with a pair of wings. In this case, the pair of wings are provided at the tip of the shield tube 4a, that is, the end on the side from which the inner needle 1 protrudes. Each of the pair of wing portions is coupled to both side portions of the outer peripheral surface of the shield tube 4a, and has a symmetrical shape with respect to the axis of the shield tube 4a. The puncturing operation is performed by lifting a pair of wings upward along the outer peripheral surface of the shield tube 4a, and holding and holding them.

(Embodiment 2)
Embodiment 2 demonstrates the other example of the indwelling needle apparatus of this invention. FIG. 10 is a perspective view of an example of the indwelling needle device of the present embodiment, and FIG. 11 is a partial cross-sectional view of the indwelling needle device shown in FIG. 10 cut along the longitudinal direction.

  The indwelling needle device shown in FIG. 10 and FIG. 11 has the same configuration as that of the indwelling needle device of the first embodiment except that it further includes an inner hub movement control member 18. Reference numerals are assigned and explanations thereof are omitted.

  As shown in FIGS. 10 and 11, the inner hub movement control member 18 in the indwelling needle device of the present embodiment includes a stopper portion 18a that can be inserted into and removed from the shield 4 lumen from the rear end side of the shield 4, and the following configuration. Department. The stopper portion 18a is inserted into the shield 4 and its tip can be brought into contact with the rear end portion end surface 2n of the inner hub 2 reaching the tip side moving end. The holding portion of the following form has the longest length of the inner needle protruding from the tip of the outer needle 8 by being gripped by the operator, and the tip of the stopper portion 18a is in contact with the rear end portion end surface 2n. In other words, in other words, the state in which the inner hub 2 reaches the distal end side moving end in the shield 4 and the distal end of the stopper portion 18a is in contact with the rear end portion end surface 2n can be held.

  The inner hub movement control member 18 includes a pair of cantilever portions 18b as holding portions. The pair of cantilever portions 18b is connected to the rear end portion of the stopper portion 18a via a substantially semi-cylindrical portion 18c that covers a part of the upper outer periphery of the shield tube 4a of the shield 4 and a bent portion 18d. The substantially semi-cylindrical portion 18 c and the pair of cantilever portions 18 b are disposed slightly apart from the outer peripheral surface of the shield 4 a of the shield 4. The pair of cantilever portions 18 b are arranged around the side portion of the shield 4 and are arranged symmetrically with respect to the center line in the longitudinal direction of the shield 4.

  The pair of cantilever portions 18b can grip the shield 4 by narrowing the distance from each other by gripping both from both sides. While the shield 4 is gripped by the pair of cantilever portions 18b, the relative position of the inner hub movement control member 18 with respect to the shield 4 can be maintained without being displaced. Therefore, when the inner hub 2 has reached the distal end side moving end in the lumen of the shield 4, the pair of cantilever portions 18 b If the shield 4 is gripped, the movement of the inner hub 2 can be prevented during that time, and the puncture operation can be performed reliably.

  As shown in FIG. 10, when a part of each cantilever part 18b is arrange | positioned in the longitudinal direction same position of the wing | blades part 5 and 6 and the shield cylinder 4a, puncture operation shields the wing | blades part 5 and 6 4 is lifted upward along the outer peripheral surface of 4 and can be held by overlapping them. In this way, each cantilever 18b is pressed against the shield 4 by the wings, the distance between the pair of cantilevers 18b is reduced, and the shield 4 is gripped by the pair of cantilevers 18b.

  Since each cantilever part 18b is arrange | positioned around the side part of the shield 4, the outer peripheral surface of the upper part of the shield 4 is exposed. Therefore, in use, the shield 4 can be pressed to the patient side by placing a finger directly on the outer peripheral surface of the upper portion of the shield 4. By this operation, it is possible to easily pull the inner needle 1 into the shield 4 by pulling the tube 3.

  In FIG. 11, the inner needle 1 is in an initial state where the tip protrudes from the outer needle 8 and can be punctured. From the viewpoint of maintaining this state, the length of the stopper portion 18a shown in FIG. 11 is too sufficient. However, as shown in FIG. 11, if the rear end side of the stopper member 18 a protrudes from the rear end of the shield 4, the protruding portion can be grasped with the tube 3 by hand. In this case, it becomes easy to perform an operation of pulling the inner needle 1 into the shield 4 while the inner hub movement control member 18 and the tube 3 are held at the same time.

  Both the indwelling needle device of the first embodiment and the indwelling needle device of the second embodiment are connectors 19 that can be connected to other medical devices at the end portions of the tube 3 that are not connected to the inner hub 2. Are preferably connected. For example, as shown in FIG. 10, the connector 19 may have a female portion 19 a that can be fitted to a male connection member having a luer taper conforming to the ISO (International Organization for Standardization) standard. Or you may have the male part which can be fitted with the female type | mold connection member etc. which have the lure taper corresponding to ISO (International Organization for Standardization) specification. Further, the connector comprises a male part and a cap member that surrounds the male part and has a cap member formed with a spiral groove that can be screwed together with the female connection member, and after the male part is press-fitted into the female connection member, A luer lock connector that can be screwed into the female connection member by rotating the cap member may be used.

  Since the indwelling needle device of the present invention has a structure capable of preventing the retention of blood in the inner needle while ensuring the cross-sectional area of the flow path from the tube to the lumen of the outer needle, the infusion fluid, the blood transfusion, the extracorporeal blood It is suitable for use in treatments such as circulation.

FIG. 1 is a sectional view along an axial direction of an example of the indwelling needle device of the present invention. 2 is another cross-sectional view along the axial direction of the example of the indwelling needle device shown in FIG. 3 is a cross-sectional view showing a state in which the inner needle of the example of the indwelling needle device shown in FIG. 1 is drawn into the shield tube. 4 is another cross-sectional view showing a state in which the inner needle of the indwelling needle device shown in FIG. 1 is drawn into the shield tube. 5 is an enlarged perspective view of an inner hub constituting the indwelling needle device shown in FIG. 6 is an enlarged plan view of the inner needle and the outer needle of the indwelling needle device shown in FIG. 7 is a sectional view taken along line VII-VII in FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 9 is a partially enlarged view of FIG. FIG. 10 is a perspective view of still another example of the indwelling needle device of the present invention. 11 is another sectional view along the axial direction of the indwelling needle device shown in FIG. FIG. 12 is a partial sectional view showing an example of a conventional indwelling needle device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner needle 2 Hub 2a Front part 2b Rear part 2c Sealing cyclic | annular recessed part 2e Transverse passage 21c Locking recessed part 3 Tube 4 Shield 4a Shield cylinder 7 Outer hub 8 Outer needle 9 Elongated opening 10 Lumen 11 O-ring 13, 14, 15 space 16 gap

Claims (7)

A shield including a substantially cylindrical shield tube;
A soft outer needle fixed to the tip of the shield;
An inner hub inserted axially into the shield lumen and connected to a tube at its rear end;
A hard inner needle fixed to the distal end of the inner hub and insertable into the lumen of the outer needle,
When the inner hub is located at the tip of the lumen of the shield, the tip of the inner needle penetrates the lumen of the outer needle and protrudes to the outside, and the inner hub is projected to the rear end of the lumen of the shield. In the indwelling needle device that can be stored in the lumen of the shield by moving to the side,
The inner hub is formed with a horizontal through passage that penetrates from the outer periphery to the inner cavity, and a space formed between the outer peripheral surface of the inner hub and the inner peripheral surface of the shield passes through the horizontal through passage. Communicates with the lumen of the inner hub;
A sealing portion is provided on the outer peripheral surface of the inner hub on the rear end side of the lateral through-passage to maintain liquid tightness between the outer peripheral surface of the inner hub and the inner peripheral surface of the shield.
The inner needle has an elongated opening that penetrates from the lumen to the outer periphery and is formed along the longitudinal direction of the inner needle, and has an end close to the distal end of the inner needle among the longitudinal ends of the elongated opening. When the distal end is the distal end and the distal end is the proximal end, the distal end is in the lumen of the outer needle in the state where the inner needle protrudes from the distal end of the outer needle is the longest. ,
The liquid that can flow from the distal end side opening of the inner needle passes through the elongated opening and the outer peripheral surface of the inner hub through a space formed between the inner peripheral surface of the outer needle and the inner needle. An indwelling needle device that can flow into a space formed between the inner peripheral surface of the shield.   2. The elongated opening is formed in at least the lower part when the inner needle is divided into two regions, with the lower side when puncturing being the lower part and the opposite side being the upper part. Indwelling needle device.   The indwelling needle device according to claim 2, wherein the elongated opening communicates the lumen of the inner needle and the outside of the inner needle at least at a lowermost portion of the lower part.   The indwelling needle device according to any one of claims 1 to 3, wherein the proximal end is in the vicinity of the inner hub.   The circumferential length of the cross section seen when the inner needle is cut in a direction perpendicular to the longitudinal direction at the location having the elongated opening is the circumferential length of the cross section when it is assumed that the elongated opening is not present. The indwelling needle device according to any one of claims 1 to 4, wherein the indwelling needle device is 2/3 or less. An inner peripheral surface of a distal end portion of the outer needle is in contact with an outer peripheral surface of the inner needle, and an inner peripheral surface of the outer needle and an outer peripheral surface of the inner needle on a proximal side from the distal end portion of the outer needle. Are separated from each other,
The indwelling needle device according to claim 2, wherein the distal end side end of the elongated opening is in the vicinity of a location in contact with the inner peripheral surface of the distal end portion of the outer needle and is closer to the proximal end side than the closely contacted location. . An inner hub movement control member detachably attached to the shield;
The inner hub movement control member is
When inserted into the shield lumen from the rear end side of the shield so that the inner needle protrudes from the distal end of the outer needle, the distal end of the inner hub can come into contact with the inner hub. A stopper part,
A holding portion capable of holding a state in which the tip of the stopper portion is in contact with the inner hub,
The said holding | maintenance part is connected with the rear-end part of the said stopper part, and includes a pair of cantilever part which can hold | grip the shield by narrowing a mutual distance by grasping both from both sides. An indwelling needle device according to any of the above items.

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