JP6864180B2 - Indwelling needle assembly - Google Patents

Description

The present invention relates to an indwelling needle assembly comprising an indwelling needle that is punctured into a blood vessel or the like and used for connection with an infusion line or the like.

Conventionally, an indwelling needle in which an inner needle is inserted into an outer needle, guided by the inner needle to puncture a blood vessel, etc., and then the inner needle is removed to connect an infusion line to the indwelled outer needle is used. Are known. However, with conventional indwelling needles, when the inner needle is removed from the outer needle, the patient's blood flows out from the outer needle placed in the blood vessel and adheres to the doctor or nurse, or the removed inner needle is removed by the doctor or nurse. May be accidentally punctured.

Therefore, the outer needle base to which the tubular outer needle and the base end portion of the outer needle are fixed, and the inner needle and the base end portion of the inner needle that can be inserted into the outer needle and the outer needle base are fixed. The inner needle base, the tubular housing that houses the inner needle base so as to be movable in the axial direction and the radial direction, and the outer needle base that is detachably held and held at a predetermined first position with respect to the housing. There is known an indwelling needle assembly including a moving member that can move from the outer needle to the second position in the needle tip direction and a spring that urges the inner needle base toward the base end direction of the housing. For example, see Patent Document 1).

In this indwelling needle assembly, the moving member has a movement blocking portion that prevents the inner needle base from moving in the radial direction in the housing when it is in the first position, and when it is in the second position. It has a pressing portion that presses the inner needle base in the housing in the radial direction and moves the inner needle base in the radial direction.

As a result, in this indwelling needle assembly, the inner needle base is locked to the front position of the housing against the urging force of the spring when the moving member is in the first position. , The movement blocking portion prevents the movement in the radial direction. On the other hand, when the moving member is moved to the second position, the movement blocking portion of the inner needle base in the radial direction is released, and the inner needle base is moved in the housing by the pressing portion. By being pressed in the radial direction and moving in the radial direction, the lock with the housing is released, and the urging force of the spring moves the housing in the proximal direction, and the tip of the inner needle is moved to the base end. It is housed in the housing.

Therefore, according to this indwelling needle assembly, the removed inner needle is housed in the housing, so that blood is scattered when the inner needle is removed from the outer needle, and the inner needle is punctured by a doctor or a nurse by mistake. Can be prevented.

Japanese Unexamined Patent Publication No. 2013-22263

However, in the indwelling needle assembly of Patent Document 1, when the moving member is moved to the second position, the inner needle is retracted by the spring. Therefore, the moving member is moved to the second position and only the outer needle is used. There is an inconvenience that the retreat of the inner needle is erroneously activated while the needle is inserted into the body and positioned.

In view of the above, it is an object of the present invention to provide an indwelling needle assembly capable of performing a more stable procedure while preventing malfunction in view of the problems of the prior art.

The indwelling needle assembly according to the present invention includes a tubular outer needle, an outer needle base to which the base end portion of the outer needle is fixed, an inner needle that can be inserted into the outer needle and the outer needle base, and the like. An inner needle base to which the base end portion of the inner needle is fixed, a tubular housing for accommodating the inner needle base so as to be movable in the axial direction and the radial direction, and a removable outer needle base at the tip portion. Then, a moving member that can move from a predetermined first position to the second position in the needle tip direction of the outer needle with respect to the housing and the inner needle base are urged toward the base end direction of the housing. When the force member and a switch that can move from a predetermined third position with respect to the housing to a fourth position in the direction opposite to the needle tip of the outer needle are provided, and the moving member is in the first position. The inner needle base is provided with a movement blocking portion that prevents the inner needle base from moving in the radial direction in the housing, and the inner needle base is urged by the urging member when the moving member is in the first position. When the moving member is locked to the housing against the force and is prevented from moving in the radial direction by the movement blocking portion and the moving member is moved to the second position, the diameter of the moving blocking portion is increased by the movement blocking portion. The movement prevention in the direction is released, and the switch has a pressing portion that presses the inner needle base in the housing in the radial direction to move the inner needle base in the radial direction when the switch is in the fourth position, and the inner needle has the inner needle. The base is radially pressed in the housing by the pressing portion and moved in the radial direction to release the lock with the housing, and the base end of the housing is released by the urging force of the urging member. It is characterized in that it is moved in a direction and the tip end portion of the inner needle is housed in the housing.

According to the present invention, after holding the housing and puncturing the target portion with the inner needle and the outer needle, the moving member is moved to the second position and only the outer needle is advanced in the radial direction of the inner needle base. You can remove the movement blockage.

Next, simply by moving the switch to the fourth position, the lock between the inner needle base and the housing is released, and the urging member moves the switch toward the base end of the housing. The inner needle can be stored in the housing without the need for it.

At this time, the release of the inner needle base from moving in the radial direction and the release of the lock between the inner needle base and the housing are divided into the operation of the moving member and the switch, respectively, so that the inner needle base is erroneously inside. It is possible to prevent the needle from retreating and causing an unexpected impact. Further, since both the moving member and the switch are moved along the axial direction of the outer needle, it is possible to prevent the needle tip of the outer needle from being shaken in the radial direction during the procedure.

Therefore, according to the present invention, when the inner needle is housed in the housing by the spring, a more stable procedure can be performed while preventing malfunction.

Further, in the present invention, on the outer peripheral surface of the inner needle base, a locked portion to be locked to the housing and a subject pressed by the pressing portion of the switch toward the base end side from the locked portion. Each pressing portion is formed, and on the inner peripheral surface of the housing, a locking portion for locking the locked portion and a supporting portion for supporting the inner needle base on the tip side of the locking portion. The urging member is sandwiched between the support portion of the housing and the locked portion of the inner needle base, and the pressing portion of the switch is inserted into the housing to form the inner needle. The inside is arranged between the locked portion of the base and the pressed portion of the inner needle base, and on at least one of the surfaces of the pressed portion of the inner needle base and the pressing portion of the switch facing each other. An inclined surface is formed in which the needle base is pressed in the radial direction to move the needle base in the radial direction, and the moving member is arranged on the opposite side of the pressing portion with the movement blocking portion sandwiching the inner needle base. Is preferable.

According to this, the above-mentioned indwelling needle assembly can be realized with a simple configuration, and the pressing portion of the switch is inserted into the housing and arranged between the locked portion and the pressed portion of the inner needle base. As a result, the support part of the housing, the urging member, the locked part of the inner needle base, the locking part of the housing, the pressing part of the switch, and the pressed part of the inner needle base can be arranged in this order. The total length of the solid can be shortened.

Further, in the present invention, the moving member has a moving member operating unit that can be fingered when moving the moving member from the first position to the second position, and the switch has the switch on the third position. It has a switch operation unit that can be fingered when moving from a position to the fourth position, and the switch operation unit at the third position is arranged adjacent to the base end side of the moving member operation unit at the first position. It is preferable to be done.

According to this, after holding the housing and puncturing the target portion with the inner needle and the outer needle, for example, the thumb or index finger of the hand holding the housing is hung on the moving member operating portion to reach the tip direction. After moving to the 2nd position, the finger is returned, and the inner needle is pulled out and the housing is removed by putting the finger on the switch operation part adjacent to the original 2nd position and pulling it toward the base end. Can be stored in. Therefore, it is not necessary to use a plurality of fingers or to pick up the finger during the procedure, so that the operation can be easily performed.

Further, in the present invention, the moving member has a moving member operating unit that can be fingered when moving the moving member from the first position to the second position, and the switch has the switch on the third position. It has a switch operation unit that can be hooked when moving from the position to the fourth position.
The switch operating unit at the third position may be configured to be arranged between the moving member operating unit at the first position and the moving member operating unit at the second position.

According to this, after holding the housing and puncturing the target portion with the inner needle and the outer needle, for example, the thumb or index finger of the hand holding the housing is hung on the moving member operating portion to reach the tip direction. After moving to two positions, when returning the finger, the inner needle can be removed and stored in the housing by hooking the finger on the switch operation unit and pulling it toward the base end. Therefore, it is not necessary to use a plurality of fingers or to pick up the finger during the procedure, so that the operation can be easily performed.

Further, when the switch operating unit at the third position is arranged between the moving member operating unit at the first position and the moving member operating unit at the second position, the moving member operating unit is moved from the moving member. It has a pillar portion extending in the radial direction and an eaves portion extending from the pillar portion in the axial direction and the direction intersecting the radial direction, and the switch operating portion is housed in the eaves portion at the first position. It is preferable that it is possible.

According to this, since the switch operating portion at the third position is covered with the eaves portion of the moving member operating portion, malfunction can be prevented.

Further, in the present invention, it is preferable that the moving member is restrained from rotating in the radial direction by at least one of the housing and the switch.

Further, in the present invention, the moving member is configured to form a notch having a cantilever-like shape so as to prevent the moving member from returning to the first position after moving to the second position. It is preferable to be done.

It is an exploded perspective view of the indwelling needle assembly which concerns on one Embodiment of this invention. It is a figure which shows the detail of the inner needle base in the indwelling needle assembly of FIG. It is a figure which shows the detail of the stopper in the indwelling needle assembly of FIG. It is a figure which shows the detail of the inner cylinder in the indwelling needle assembly of FIG. It is a figure which shows the detail of the switch in the indwelling needle assembly of FIG. It is a figure which shows the detail of the outer cylinder in the indwelling needle assembly of FIG. It is sectional drawing which shows the state when the case in the indwelling needle assembly of FIG. 1 moves. It is a figure which shows the base end part of the inner cylinder in the modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of an indwelling needle assembly according to an embodiment of the present invention.

As shown in FIG. 1, the indwelling needle assembly 1 includes an indwelling portion 2 to be indwelled at a target portion, an inner needle 3 inserted into the indwelling portion 2, and an inner needle to which a base end portion of the inner needle 3 is fixed. The base 4 and the housing 5 that movably stores and holds the inner needle base 4 in the axial direction and the radial direction, and the second position in the needle tip direction of the indwelling portion 2 from a predetermined first position with respect to the housing 5. An inner cylinder 6 that is attached so as to be able to slide to a position, a compression spring S that urges the inner needle base 4 toward the base end of the housing 5, and an indwelling portion from a predetermined third position with respect to the housing 5. It is provided with a switch 7 that is attached so as to be able to slide to a fourth position in the direction opposite to the needle tip of 2.

The inner cylinder 6 constitutes the moving member in the present invention. Further, the compression spring S constitutes the urging member in the present invention. The first position is the position of the inner cylinder 6 in FIG. 7A, and the second position is the position of the inner cylinder 6 in FIGS. 7B to 7D, as will be described later. The third position is the position of the switch 7 in FIGS. 7A and 7B, and the fourth position is the position of the switch 7 in FIGS. 7C and 7D.

The indwelling portion 2 includes a tubular outer needle 21 and an outer needle base 22 to which the base end portion of the outer needle 21 is fixed. The outer needle 21 is provided with a shaving bamboo-shaped puncture portion 21a at its tip.

The inner needle 3 is inserted into the outer needle 21 and the outer needle base 22 so that the tip thereof protrudes from the tip of the outer needle 21.

The housing 5 includes an outer cylinder 8 and a stopper 9 fixed to the outer cylinder 8. A protector 10 is attached to the tip of the housing 5 to protect the indwelling portion 2 and the inner needle 3.

FIG. 2 shows the details of the inner needle base 4. 2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a sectional view taken along the line CC of FIG. 2A.

As shown in FIG. 2, the inner needle base 4 is adjacent to the hollow cylindrical inner needle fixing portion 41 into which the inner needle 3 is inserted and fixed, and the base end side of the inner needle fixing portion 41, and fixes the inner needle. A hollow cylindrical filter insertion portion 42 having a diameter larger than that of the portion 41 is provided.

The portion transitioning from the inner needle fixing portion 41 to the filter inserting portion 42 is a stepped portion 43 pressed by the compression spring S together with a protruding portion described later.

A locked portion 44 extending along a direction orthogonal to the axis of the inner needle base 4 is provided on the upper portion and the tip end side of the filter inserting portion 42. The tip surface of the locked portion 44 is flush with the stepped portion 43.

A protruding portion 45 that is pushed downward by the switch 7 when the switch 7 is moved from the third position to the fourth position is provided on the upper portion and the proximal end side of the filter insertion portion 42. The protruding portion 45 is provided with an inclined surface 45a for enabling the pressing. The protruding portion 45 constitutes the pressed portion in the present invention.

The periphery of the filter insertion portion 42 is composed of a transparent member so that the flashback of blood generated in the filter insertion portion 42 can be visually recognized. A filter (air diffuser) 46 (FIG. 1) that allows only gas to pass through and suppresses the passage of liquid is inserted into the filter insertion portion 42.

FIG. 3 shows the details of the stopper 9. 3A is a plan view, FIG. 3B is a front view, FIG. 3C is a left side view, FIG. 3D is a right side view, FIG. 3E is a bottom view, and FIG. 3F is a sectional view taken along the line FF of FIG. 3A.

As shown in FIG. 3, the stopper 9 includes a partial cylindrical portion 91 having a substantially cylindrical bottom surface side cut out and opening, a top plate portion 92 that closes the tip of the partial cylindrical portion 91, and a base end. It has a bottom plate portion 93 to be closed.

The outer diameter of the partial cylindrical portion 91 is about the same as or slightly smaller than the inner diameter of the inner cylinder 6, and the inner diameter of the partial cylindrical portion 91 is about the same as or slightly larger than the inner needle base 4. Has.

A rectangular stopper slit portion 94 extending in the longitudinal direction is formed above and on the tip end side of the partial cylindrical portion 91.

The partial cylindrical portion 91 is formed with a locking storage portion 95 that is adjacent to the tip end side of the stopper slit portion 94 and is locked in a state where the locked portion 44 of the inner needle base 4 is fitted. .. The base end side surface of the locking storage portion 95 supports the tip surface of the locked portion 44, and the locking portion is released when the inner needle base 4 is swung to the support release position described later. It constitutes 95a.

A convex portion 96 that is slidably fitted to the inner cylinder slit portion 63 of the inner cylinder 6 to be described later is provided on the upper portion of the partial cylindrical portion 91 adjacent to the base end side of the stopper slit portion 94.

The top plate portion 92 is configured as an annular and flat plate-shaped member. The axis of the ring coincides with the axis of the housing 5.

A circular through hole 92a into which the inner needle fixing portion 41 of the inner needle base 4 is loosely fitted is formed in the central portion of the top plate portion 92. Since the hole diameter of the circular through hole 92a is slightly larger than the outer diameter of the inner needle fixing portion 41, the circular through hole 92a allows the inner needle base 4 to be removed in the proximal direction and the inner needle. The tip end side of the inner needle base 4 is loosely supported so that the base end side of the base 4 can swing from a predetermined support position described later to a support release position and move in the radial direction.

The surface of the top plate portion 92 on the base end side is a support portion 92b that supports the tip of the compression spring S. Below the top plate portion 92, a recess 92c corresponding to the swing blocking portion 65 of the inner cylinder 6 described later is formed.

The bottom plate portion 93 is configured as a disk-shaped and flat plate-shaped member having a diameter larger than the outer diameter of the partial cylindrical portion 91. The axis of the disk coincides with the axis of the housing 5. On the base end surface of the bottom plate portion 93, a pair of claw portions 93a extending in parallel with the plane including the axis of the housing 5 and the vertical direction are provided adjacent to each other with the axis.

FIG. 4 shows the details of the inner cylinder 6. 4A is a plan view, FIG. 4B is a front view, FIG. 4C is a left side view, FIG. 4D is a right side view, and FIG. 4E is a sectional view taken along the line EE of FIG. 4A.

As shown in FIG. 4, the inner cylinder 6 is a hollow cylinder that is adjacent to the hollow cylindrical outer needle base mounting portion 61 on the base end side of the outer needle base mounting portion 61 and has a larger diameter than the outer needle base mounting portion 61. It is provided with a cylindrical portion 62 having a shape. The outer needle base mounting portion 61 and the cylindrical portion 62 communicate with each other, and their axes coincide with the axes of the housing 5.

The outer peripheral surface of the outer needle base attachment portion 61 is detachably attached by fitting the base end portion of the outer needle base 22 to the outside. Further, the inner needle fixing portion 41 of the inner needle base 4 is inserted into the inner peripheral surface of the outer needle base mounting portion 61 so as to be able to advance and retreat.

The inner diameter of the cylindrical portion 62 is larger than the outer diameter of the partial cylindrical portion 91 of the stopper 9 and smaller than the diameter of the bottom plate portion 93 of the stopper 9. The outer diameter of the cylindrical portion 62 has the same size as the diameter of the bottom plate portion 93 of the stopper 9. As a result, the stopper 9 is inserted into the cylindrical portion 62 so as to be able to advance and retreat from the base end portion side, and the base end of the inner cylinder 6 and the front end side surface of the bottom plate portion 93 are in contact with each other, so that further insertion is suppressed. ..

Above the cylindrical portion 62, a rectangular inner cylinder slit portion 63 extending from the base end portion toward the tip end side along the longitudinal direction is formed. The widths of the inner cylinder slit portion 63 and the stopper slit portion 94 of the stopper 9 in the lateral direction are formed to have the same size. An assembly groove 64 narrower than the inner cylinder slit portion 63 is provided between the base end of the inner cylinder slit portion 63 and the base end of the cylindrical portion 62. On the base end side of the assembly groove 64, there is a pair of inclined portions 64a in which the width of the groove gradually increases toward the base end.

Below the inner peripheral surface of the cylindrical portion 62, a convex rocking blocking portion 65 extending from the tip end to the proximal end side is provided. The rocking blocking portion 65 blocks the movement of the inner needle base 4 in the radial direction, and constitutes the movement blocking portion of the present invention. Further, by fitting the swing blocking portion 65 and the recess 92c of the stopper 9, it is possible to prevent the stopper 9 from relatively rotating inside the inner cylinder 6.

An inner cylinder operating portion 66 for moving the inner cylinder 6 from the first position to the second position is provided at the upper portion and the tip of the cylindrical portion 62. As shown in FIG. 4C, the inner cylinder operating portion 66 is a bridge portion 66b connecting a pair of pillar portions 66a and 66a provided with a plane extending in the vertical direction including an axis and both pillar portions 66a (the present invention). It is formed in an arch shape by (corresponding to the eaves part of.). The inner cylinder operation unit 66 is provided with a pair of pillar portions 66a, 66a separated from the width of the switch operation unit 74 so that the switch operation unit 74, which will be described later, can pass through. The inner cylinder operation unit 66 constitutes the moving member operation unit of the present invention.

The base end side of the pillar portion 66a has a surface that is slightly inclined upward to the tip end side so that the inner cylinder 6 can be easily pushed toward the tip end side of the housing 5 with the thumb or index finger of the hand holding the housing 5. ing.

FIG. 5 shows the details of the switch 7. 5A is a plan view, FIG. 5B is a front view, FIG. 5C is a left side view, FIG. 5D is a right side view, FIG. 5E is a bottom view, and FIG. 5F is a sectional view taken along the line AA of FIG. 5A.

As shown in FIG. 5, the switch 7 includes a rectangular upper plate-shaped member 71 extending along the longitudinal direction, a rectangular lower plate-shaped member 72 extending in parallel below the upper plate-shaped member 71, and an upper portion. It has a connecting portion 73 that joins the base end portion of the plate-shaped member 71 and the base end portion of the lower plate-shaped member 72 and extends in the proximal direction.

As shown in FIGS. 5C and 5D, the width of the upper plate-shaped member 71 in the lateral direction is about the same as the width of the lower plate-shaped member 72 in the lateral direction, and is larger than the width of the joint portion 73 in the lateral direction. Is also large.

Further, the width of the inner cylinder slit portion 63 of the inner cylinder 6 in the lateral direction exceeds the width of the joint portion 73 and is smaller than the width of the upper plate-shaped member 71. As a result, the coupling portion 73 is fitted into the inner cylinder slit portion 63 and is slidable, but the upper plate-shaped member 71 and the lower plate-shaped member 72 do not pass through the inner cylinder slit portion 63 unless they are forcibly deformed.

The upper plate-shaped member 71 is curved along the outer peripheral surface of the inner cylinder 6, the lower plate-shaped member 72 is curved along the outer peripheral surface of the filter insertion portion 42 of the inner needle base 4, and the joint portion 73 is a stopper 9. It is curved along the outer peripheral surface of.

A switch operation unit 74 for moving the switch 7 from the third position to the fourth position is provided on the upper portion and the tip of the upper plate-shaped member 71. The tip end side of the switch operation unit 74 has a surface slightly inclined upward toward the base end side so that the thumb or index finger of the hand holding the housing 5 can easily push the switch operation unit 74 toward the base end side.

A pair of overhanging portions 75, 75 are provided on both side surfaces of the upper plate-shaped member 71 adjacent to the base end side of the switch operating portion 74. The overhanging portions 75 and 75 extend along the lateral direction of the upper plate-shaped member 71, respectively.

At the tip of the lower plate-shaped member 72, a pressing storage portion 76 is formed which penetrates vertically and fits the protruding portion 45 of the inner needle base 4. When the switch 7 moves to the fourth position, the front end side surface of the pressing storage portion 76 comes into contact with the protruding portion 45 of the inner needle base 4 to push the protruding portion 45 downward, and the inner needle base 4 is shaken as described later. It constitutes a pressing portion 76a that causes motion. In the embodiment, the protruding portion 45 is provided with an inclined surface 45a for enabling pressing, but the present invention is not limited to this, and the pressing portion 76a is provided with an inclined surface for enabling pressing. May be good.

Of the bottom surface of the lower plate-shaped member 72, the peripheral edge of the pressing storage portion 76 constitutes a swing prevention mechanism in cooperation with the swing prevention portion 65 of the inner cylinder 6. That is, the peripheral edge portion and the swing blocking portion 65 sandwich the filter insertion portion 42 of the inner needle base 4 from the vertical direction until the inner cylinder 6 is moved from the first position to the second position, and the inner needle base Prevents 4 from swinging downward.

FIG. 6 shows the details of the outer cylinder 8. 6A is a plan view, FIG. 6B is a front view, FIG. 6C is a left side view, FIG. 6D is a right side view, FIG. 6E is a sectional view taken along the line EE of FIG. is there.

As shown in FIG. 6, the outer cylinder 8 has a hollow cylindrical main body 81 having a pair of non-slip portions 81a formed on both side surfaces, and a disk-shaped flat plate provided at the base end of the main body 81. It includes a bottom portion 82 which is a member.

The upper portion of the outer cylinder 8 is formed with an outer cylinder slit portion 83 that is open in a slit shape from the tip to the center.

The tip side of the outer cylinder slit portion 83 has a width equivalent to the width of the inner cylinder operation portion 66 of the inner cylinder 6, and is an inner cylinder storage portion 83a for accommodating the inner cylinder operation portion 66 in the first position. ..

The outer cylinder slit portion 83 is provided with a pair of return prevention portions 83b adjacent to the base end side of the inner cylinder storage portion 83a. The pair of return prevention portions 83b are formed by projecting convexly from the opposite edges of the outer cylinder slit portions 83 in the directions of approaching each other, and when the switch 7 moves from the third position to the fourth position, the pair of return prevention portions 83b is formed. It comes into contact with the overhanging portions 75 and 75 of the switch 7 to prevent further movement.

The outer cylinder slit portion 83 is adjacent to the base end side of the return prevention portion 83b, and is formed with a switch storage portion 83c that is narrower than the inner cylinder storage portion 83a and stores the switch 7.

The bottom portion 82 has a disc shape with a rectangular opening at the center, and locks the claw portion 93a of the stopper 9. At the open end edge of the bottom 82, the front end side surface is an inclined surface so that the claw portion 93a can easily get over it, while the base end side surface can prevent the overcoming claw portion 93a from returning to the base. The surface is perpendicular to the axis of the outer cylinder 8.

The indwelling needle assembly 1 is assembled as follows.

That is, as can be understood from FIGS. 1 to 6, first, the above-mentioned filter (air diffuser) 46 is inserted into the filter insertion portion 42 of the inner needle base 4. Next, while compressing the compression spring S, one end thereof presses the stepped portion 43 of the inner needle base 4, and the spring S is attached to the inner needle fixing portion 41 of the inner needle base 4.

Next, the stopper 9 is attached to the inner needle base 4 from above. That is, the inner needle fixing portion 41 is fitted to the top plate portion 92 at the tip of the stopper 9, the top plate portion 92 presses the other end of the compression spring S, and the locked portion 44 of the inner needle base 4 is stoppered. The stopper 9 is arranged with respect to the inner needle base 4 so as to fit into the locking storage portion 95 of 9. At this time, the locking portion 95a of the locking storage portion 95 locks the locked portion 44 of the inner needle base 4 against the urging force of the compression spring S.

As a result, the tip end side of the inner needle base 4 is supported by the top plate portion 92 so that the base end side of the inner needle base 4 can swing downward.

Next, the switch 7 is attached to the stopper 9 from above. That is, the pressing storage portion 76 of the switch 7 is fitted to the protruding portion 45 of the inner needle base 4, and the lower plate-shaped member 72 of the switch 7 is fitted along the stopper slit portion 94 of the stopper 9.

As a result, the switch 7 is attached to the stopper 9 at the third position.

Next, the tip end portion of the stopper 9 is inserted from the base end side of the inner cylinder 6, and the inner cylinder 6 is inserted into the inner needle base 4, the stopper 9 and until the base end of the inner cylinder 6 contacts the bottom plate portion 93 of the stopper 9. Slide against switch 7.

That is, since the assembly groove 64 of the inner cylinder 6 includes the inclined portion 64a, the coupling portion 73 of the switch 7 and the convex portion 96 of the stopper 9 sequentially get over the assembly groove 64 and are inserted into the inner cylinder slit portion 63. Slit. Further, as the stopper 9 is advanced, the cylindrical portion 62 of the inner cylinder is inserted so as to be sandwiched between the upper plate-shaped member 71 and the lower plate-shaped member 72 of the switch 7. When the stopper 9 is advanced to the tip of the inner cylinder 6, the inner needle fixing portion 41 of the inner needle base 4 is inserted into the outer needle base mounting portion 61, and the swing blocking portion 65 of the inner cylinder 6 is inserted. The recess 92c of the stopper 9 is fitted, and the lower portion of the filter insertion portion 42 of the inner needle base 4 is supported.

When the stopper 9 is further advanced until it comes into contact with the tip of the inner cylinder 6, the switch operation portion 74 of the switch 7 enters and is stored in the arched lower portion of the inner cylinder operation portion 66 of the inner cylinder 6. Since the inner length of the inner cylinder 6 and the outer length of the stopper 9 are about the same, when the stopper 9 is advanced until it comes into contact with the tip of the inner cylinder 6, the base end of the inner cylinder 6 becomes the bottom plate of the stopper 9. It touches part 93.

As a result, the inner cylinder 6 is attached to the stopper 9 at the first position, and the position of the inner cylinder operating portion 66 at the first position of the inner cylinder 6 and the switch at the third position of the switch 7. The position of the operation unit 74 substantially coincides with the position in the longitudinal direction.

At this time, the swing blocking portion 65 of the inner cylinder 6 is supported by sandwiching the filter insertion portion 42 of the inner needle base 4 from above and below by the bottom surface of the second plate-shaped member of the switch 7 and the inner peripheral surface of the stopper 9. Then, the filter insertion portion 42 is prevented from swinging downward with respect to the top plate portion 92.

Further, the rocking prevention portion 65 and the recess 92c of the stopper 9 prevent the stopper 9 from rotating relatively inside the inner cylinder 6.

Next, the base end portion of the inner cylinder 6 is inserted from the tip end side of the outer cylinder 8, and the outer cylinder 8 is inserted into the inner needle base 4, the stopper 9, until the bottom plate portion 93 of the stopper 9 comes into contact with the bottom portion 82 of the outer cylinder. Slide against switch 7 and inner cylinder 6. At this time, the upper plate-shaped member 71 of the switch 7 and the inner cylinder operating portion 66 of the inner cylinder 6 are guided by the outer cylinder slit portion 83 of the outer cylinder 8.

That is, the switch 7 is inserted along the outer cylinder slit portion 83, the upper plate-shaped member 71 of the switch 7 is stored in the switch storage portion 83c, and the inner cylinder operation portion 66 is stored in the inner cylinder storage portion 83a. To do. Further, when the inner cylinder 6 is inserted until it comes into contact with the base end of the outer cylinder 8 and further pushed in the direction of the base end, the claw portion 93a of the stopper 9 is locked over the opening provided in the bottom portion 82 of the outer cylinder 8. To. As a result, the mounting of the outer cylinder 8 is completed, and the inner cylinder 6 is mounted at the first position with respect to the outer cylinder 8.

Next, an adhesive is applied to the base end portion of the inner needle 3, and the base end portion is inserted into the inner needle fixing portion 41 of the inner needle base 4 and adhered.

Next, the indwelling portion 2 is attached to the inner cylinder 6 by fitting the outer needle base attaching portion 61 of the inner cylinder 6 to the outer needle base 22 of the indwelling portion 2. Further, the tip end portion of the outer cylinder 8 is inserted into the base end portion of the protector 10, and the protector 10 is attached to the outer cylinder 8. As a result, the assembly of the indwelling needle assembly 1 is completed.

When using the indwelling needle assembly 1, first, the protector 10 is removed from the indwelling needle assembly 1 to expose the outer needle 21.

Next, the housing 5 is held, and the inner needle 3 and the outer needle 21 are punctured into the target portion of the blood vessel. At this time, the fact that the inner needle 3 and the outer needle 21 were punctured into the blood vessel can be confirmed by the occurrence of blood flashback at the filter insertion portion 42 of the inner needle base 4.

Since the base end portion of the inner needle base 4 is blocked by the filter (air diffuser) 46 inserted into the filter insertion portion 42, blood does not flow out from the base end portion of the inner needle base 4. And the backflow of blood to the tip side is restricted.
To.

As described above, when the inner cylinder 6 is located at the first position, the inner needle base 4 can swing the tip end side of the inner needle fixing portion 41 by the top plate portion 92 of the stopper 9, as shown in FIG. 7A. It is supported and supported by the locking portion 95a of the stopper 9 via the locked portion 44 of the inner needle base 4 against the urging force of the compression spring S.

Further, since the swing blocking portion 65 of the inner cylinder 6 supports the lower portion of the filter inserting portion 42, the swing blocking portion 42 of the filter inserting portion 42 is prevented from swinging downward.

Next, by pushing the inner cylinder operation unit 66 with the thumb or index finger of the hand holding the housing 5, only the outer needle 21 is further delivered into the blood vessel. As a result, when the inner cylinder 6 is moved from the first position toward the tip end to reach the second position, the swing blocking portion 65 is disengaged from the lower part of the filter inserting portion 42 as shown in FIG. 7B, and the filter inserting portion is inserted. It moves to the position of the cylindrical portion 62 having a diameter larger than 42.

As a result, the prevention of the swing of the inner needle base 4 by the swing blocking portion 65 is released.

Next, the switch operation unit 74 of the switch 7 is pulled with the thumb or index finger of the hand holding the housing 5. As a result, when the switch 7 is moved from the third position toward the base end to reach the fourth position, the pressing portion 76a of the switch 7 comes into contact with the protruding portion 45 of the inner needle base 4, as shown in FIG. 7C. Press the protrusion 45. As a result, the inner needle base 4 swings around the top plate portion 92 of the stopper 9, and the filter insertion portion 42 of the inner needle base 4 is displaced downward. Along with this, the locked portion 44 of the inner needle base 4 is displaced downward and disengages from the position supported by the locking portion 95a of the stopper 9, and the locked portion 44 is released from being supported by the locking portion 95a. Will be done.

As a result, as shown in FIG. 7D, the compression spring S expands and moves the inner needle base 4 until it comes into contact with the bottom plate portion 93 of the stopper 9. Along with this, the inner needle 3 fixed to the inner needle base 4 is pulled out from the outer needle 21 and housed in the housing 5.

When the switch 7 reaches the fourth position, the return prevention portion 83b of the outer cylinder 8 comes into contact with the overhanging portion 75 of the switch 7, so that further movement of the switch 7 is prevented.

After that, by removing the outer needle base attachment portion 61 of the inner cylinder 6 from the outer needle base 22, the outer needle 21 with the outer needle base 22 can be placed in the target portion. By connecting an infusion line or the like to the indwelled outer needle base 22, treatment such as infusion is performed.

As described above, according to the present embodiment, after holding the housing 5 and puncturing the inner needle 3 and the outer needle 21 into the target portion, the inner cylinder is used with the thumb or index finger of the hand holding the housing 5. By hooking a finger on the inner cylinder operating portion 66 of 6 and pushing it toward the tip end, only the outer needle 21 can be further sent into the blood vessel, and the prevention of the swing of the inner needle base 4 can be released. Then, the support of the inner needle base 4 against the compression spring S (the urging member) is released by swinging the inner needle base 4 simply by hooking a finger on the switch operation portion 74 of the switch 7 and pulling it toward the base end. , The inner needle base 4 can be moved toward the proximal end by the compression spring S, and the inner needle 3 can be accommodated in the housing 5.

At this time, the prevention of the swing of the inner needle base 4 is released by pushing the inner cylinder operating portion 66 toward the tip end, and the swing of the inner needle base 4 is released from the support by the stopper 9. Since the operations are divided so that the switch operation unit 74 is pulled toward the base end, it is possible to prevent the inner needle 3 from being accidentally triggered to retract and the inner needle being accommodated at an unexpected timing. ..

Further, since the above-mentioned operation of pushing the inner cylinder operation unit 66 toward the tip end and the operation of pulling the switch operation unit 74 toward the base end direction are both along the axial direction of the outer needle 21, they are outside during the procedure. It is possible to prevent the tip of the needle from moving in the radial direction.

Further, in the present embodiment, the position of the inner cylinder operating portion 66 at the first position of the inner cylinder 6 and the position of the switch operating portion 74 at the third position of the switch 7 are substantially the same in the longitudinal direction. The operation of pushing the inner cylinder operating unit 66 toward the tip and the operation of pulling the switch operating unit 74 toward the base end can be performed only by extending and bending the finger. Therefore, it is not necessary to use a plurality of fingers or to pick up the finger during the procedure, so that the operation can be easily performed.

Further, the coupling portion 73 of the switch 7 and the convex portion 96 of the stopper 9 are sandwiched by the opposing edges of the inner cylinder slit portion 63 of the inner cylinder 6, and the upper plate-shaped member 71 of the switch 7 is further formed by the outer cylinder 8. Since it is sandwiched between the return prevention portions 83b and 83b, the stopper 9, the inner cylinder 6 and the outer cylinder 8 are prevented from rotating relatively via the switch 7, so that the procedure can be performed stably. Can be done.

Further, as shown in FIG. 5B, the switch 7 has a substantially tuning fork shape in which the upper plate-shaped member 71 and the lower plate-shaped member 72 are connected by the connecting portion 73, so that the switch operating portion 74 is pulled toward the base end. When operated, compression and tension work along the longitudinal direction of the upper plate-shaped member 71 and the lower plate-shaped member 72. Therefore, since twisting and bending do not occur, the width can be designed to be narrow. Further, since it has the above-mentioned substantially tuning fork shape, the lower plate-shaped member 72 is placed inside the cylindrical portion 62 of the inner cylinder 6 in a state where the pressing storage portion 76 of the switch 7 is fitted to the protruding portion 45 of the inner needle base 4. Can be assembled to fit in. Therefore, according to the present embodiment, the indwelling needle assembly 1 can be miniaturized with a simple configuration.

The present invention is not limited to the above-described embodiment.

For example, in the present embodiment, the inner cylinder operating portion 66 is formed in an arch shape by a pair of pillar portions 66a, 66a and a cross-linking portion 66b connecting both pillar portions 66a, but the cross-linking portion 66b is omitted. The pair of pillars 66a and 66a may be used, the cross-linked portion 66b and the pillar 66a may be omitted to form one pillar 66a, and the pillar 66a may be omitted to form the L-shaped inner cylinder operating portion 66. May be good.

Further, for example, in the present embodiment, the inner cylinder operating portion 66 is formed in an arch shape, and the switch operating portion 74 is arranged inside the arch-shaped inner cylinder operating portion 66 so that the position of the inner cylinder operating portion 66 at the first position of the inner cylinder 6 can be determined. , The position of the switch operation unit 74 at the third position of the switch 7 was matched in the longitudinal direction, but the switch operation unit 74 at the third position was moved to the position of the inner cylinder operation unit 66 at the first position of the inner cylinder 6. It may be arranged adjacent to the base end side.

Further, as shown in FIG. 8, a return prevention mechanism 67 for preventing the inner cylinder 6 from returning to the first position after the inner cylinder 6 is moved from the first position to the second position is provided on the inner cylinder 6. It may be provided at the base end portion.

The return prevention mechanism 67 is formed by a notch from the inner cylinder slit portion 63, and protrudes into the inner cylinder slit portion 63 at the free end of a pair of cantilever-shaped portions extending in the longitudinal direction of the inner cylinder slit portion 63. It is composed as a part. As a result, when the inner cylinder 6 moves from the first position to the second position, the return prevention mechanism 67 is elastically pressed by the convex portion 96 of the stopper 9 so that the inner cylinder 6 can be returned.

The tip end side of the inner cylinder 6 of the return prevention mechanism 67 has an inclined surface so that the convex portion 96 of the stopper 9 can easily get over it. Further, the opposite side edges of the central portion of the return prevention mechanism 67 are cut out in a U shape corresponding to the convex portion 96 so as to prevent the overcoming convex portion 96 from being fitted and returning to the base. ing.

As a result, it is possible to prevent the inner cylinder 6 from returning to the first position and the outer needle 21 from coming off from the puncture site.

1 ... Indwelling needle assembly, 21 ... Outer needle, 22 ... Outer needle base, 3 ... Inner needle, 4 ... Inner needle base, 44 ... Locked part, 45 ... Protruding part (pressed part), 45a ... Inclined surface 5, ... Housing, 6 ... Inner cylinder (moving member), 65 ... Swing blocking part (moving blocking part), 66 ... Inner cylinder operating part (moving member operating part), 66a ... Pillar part, 66b ... Cross-linking part ( Eaves), 7 ... Switch, 74 ... Switch operation part, 76a ... Pressing part, 92a ... Circular through hole (support part), 95a ... Locking part, S ... Compression spring (biasing member).

Claims (7)

A tubular outer needle, an outer needle base to which the base end portion of the outer needle is fixed, an inner needle that can be inserted into the outer needle and the outer needle base, and a base end portion of the inner needle are fixed. An inner needle base, a tubular housing for accommodating the inner needle base so as to be movable in the axial direction and the radial direction, and a tubular housing.
A moving member that is removable and holds the outer needle base at the tip portion and can move from a predetermined first position with respect to the housing to a second position in the needle tip direction of the outer needle.
An urging member that urges the inner needle base toward the base end of the housing,
A switch that can move from a predetermined third position with respect to the housing to a fourth position in the direction opposite to the needle tip of the outer needle is provided.
The moving member has a movement blocking portion that prevents the inner needle base from moving in the radial direction in the housing when it is in the first position.
When the moving member is in the first position, the inner needle base is locked to the housing against the urging force of the urging member and is moved in the radial direction by the movement blocking portion. Is blocked, and when the moving member is moved to the second position, the radial movement blocking by the movement blocking portion is released.
The switch has a pressing portion that presses the inner needle base in the housing in the radial direction to move the inner needle base in the radial direction when the switch is in the fourth position.
The inner needle base is radially pressed in the housing by the pressing portion and moved in the radial direction to release the lock with the housing, and the housing is released by the urging force of the urging member. An indwelling needle assembly characterized in that the tip of the inner needle is accommodated in the housing by being moved in the direction of the proximal end of the needle. In the indwelling needle assembly according to claim 1,
On the outer peripheral surface of the inner needle base, a locked portion that is locked to the housing and a pressed portion that is pressed by the pressing portion of the switch are formed on the base end side of the locked portion, respectively. Being done
On the inner peripheral surface of the housing, a locking portion for locking the locked portion and a supporting portion for supporting the inner needle base are formed on the tip side of the locking portion, respectively.
The urging member is sandwiched between the support portion of the housing and the locked portion of the inner needle base.
The pressing portion of the switch is inserted into the housing and is arranged between the locked portion of the inner needle base and the pressed portion of the inner needle base.
At least one of the surfaces of the pressed portion of the inner needle base and the pressing portion of the switch facing each other is formed with an inclined surface that presses the inner needle base in the radial direction and moves the inner needle base in the radial direction. Being done
The moving member is an indwelling needle assembly characterized in that the movement blocking portion is arranged on the opposite side of the pressing portion with the inner needle base interposed therebetween. In the indwelling needle assembly according to claim 1 or 2.
The moving member has a moving member operating unit that can be fingered when moving the moving member from the first position to the second position.
The switch has a switch operation unit that can be fingered when moving the switch from the third position to the fourth position.
An indwelling needle assembly characterized in that the switch operating portion at the third position is arranged adjacent to the base end side of the moving member operating portion at the first position. In the indwelling needle assembly according to claim 1 or 2.
The switch has a switch operation unit that can be fingered when moving the switch from the third position to the fourth position.
The moving member has a moving member operating unit that can be fingered when moving the moving member from the first position to the second position.
An indwelling needle assembly characterized in that the switch operating unit at the third position is arranged between the moving member operating unit at the first position and the moving member operating unit at the second position. In the indwelling needle assembly according to claim 4,
The moving member operating portion has a pillar portion extending in the radial direction from the moving member and an eaves portion extending from the pillar portion in the axial direction and the radial direction intersecting the first position. An indwelling needle assembly characterized in that the switch operating portion can be stored in the eaves portion. In the indwelling needle assembly according to claim 1 or 2.
The moving member is an indwelling needle assembly in which rotation in the radial direction is suppressed by at least one of the housing and the switch. In the indwelling needle assembly according to claim 1 or 2.
The moving member is an indwelling needle assembly that is prevented from returning to the first position after moving to the second position by forming a notch having a cantilever-like shape.

Images