JPH0880349A - Unit for removing injection needle - Google Patents

Abstract

PURPOSE: To easily remove injection needles from used syringes and to discard these needles. CONSTITUTION: Pawl members 11, 11... are radially disposed via guiding blocks 13 on a rotary base 12 and this rotary base is provided with stationary cam plates 17, 17 in correspondence to these respective pawl members 11. The rotary base 12 is rotated as a whole and vertically driven by means of driving mechanisms 20. At this time, the pawl members 11, 11... are driven forward and backward via the cam grooves of the stationary cam plates 17, 17. The pawl members 11, 11,..., thereupon, remove the injection needles A2 coupled by screwing to the syringes A and drop the needles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection needle removing device for easily removing an injection needle from a used syringe or blood collecting device and discarding it.

[0002]

2. Description of the Related Art Used syringes and blood collection devices (hereinafter, simply referred to as syringes) are required to be discarded after removing the injection needle from the injection cylinder. The injection needle is generally made of metal and requires a disposal process different from that of an injection cylinder made of plastics or glass.It has a sharp tip and is dangerous. Because it can be a source of infection. It should be noted that the injection needle is generally attached to the injection barrel via a male and female fitting connection, but there are many cases where the injection needle is connected by a screw connection.

Therefore, there is known an injection needle removing device capable of automatically removing and discarding the injection needle from the injection cylinder by a simple operation (Japanese Patent Laid-Open No. 5-269174).
Issue). This is mainly composed of a rotary unit having a plurality of claw members arranged in a circle and swinging up and down at the same time, and the claw member has a horizontal posture in which the tip is engaged with the screw drive part of the injection needle. , The tip is disengaged from the screw driving part, and the injection needle can be inclined downward. Therefore, with the claw member in a horizontal position, insert the injection needle in the center,
By driving the claw member to the inclined posture while rotating the whole in the direction of removing the injection needle, the injection needle can be removed from the injection cylinder, and the removed injection needle can be dropped into the lower waste pot.

[0004]

According to the prior art, since the injection needle is rotationally driven in the detaching direction via the pawl member that swings up and down, the engagement between the pawl member and the screw drive portion of the injection needle. There is a problem in that the joint depth gradually becomes shallower during the rotational driving, the pawl member may come off the screw driving portion quickly, and the detaching operation of the injection needle may become uncertain. In addition, since the claw member is forced to shallowly engage the screw driving portion to rotationally drive the injection needle, there is a problem that the tip of the claw member may be damaged early.

Therefore, in view of the problems of the prior art, an object of the present invention is to replace the claw member with the vertical swing,
An object of the present invention is to provide an injection needle removal unit in which the operation of removing the injection needle is surely performed by driving the needle back and forth and the nail member is not prematurely damaged.

[0006]

The structure of the present invention for achieving the above object has a radial guide groove, and a rotary base that moves up and down while rotating, and is slidably housed in each guide groove. It is provided with a plurality of claw members and a plurality of fixed cam plates that drive each claw member back and forth through a cam groove, and each claw member has a screw drive unit whose tip is an injection needle when the rotation base is raised. The gist is to take a retracted position in which the tip is disengaged from the screw drive portion when the rotation base is lowered by taking the advance position that engages with.

The guide groove may be formed in a guide block on the rotary base, or the rotary base may be vertically movably installed between an upper plate and a lower plate connected via a spacer rod. Good.

[0008]

According to the structure of the invention, the pawl member can be driven back and forth through the cam groove of the fixed cam plate by moving the rotary base up and down, and when the forward position is taken, the tip end is an injection. Engage with the screw drive of the needle. Therefore,
If the rotating base is rotated and lowered in this state, the claw member descends together with the rotating base while rotating in the detaching direction of the injection needle, and finally takes the retracted position to move the injection needle from the syringe barrel. It can be removed and dropped down. The claw member at this time can start the backward movement at the same time when the injection needle is removed by appropriately determining the shape of the cam groove.

If the guide groove is formed in the guide block on the rotary base, the claw member housed in the guide groove can be set at an arbitrary height position by changing the height of the guide block. The guide block at this time may be formed integrally with the rotation base, or may be separately provided and mounted on the rotation base.

When the rotary base is assembled between the upper plate and the lower plate, the rotary base, the upper plate, and the lower plate can be formed as a compact integrated rotary unit as a whole, and therefore, can be combined with any drive mechanism. Thereby, the device for removing the injection needle can be easily configured. At this time, the fixed cam plate may be fixed to either the upper plate or the lower plate.

[0011]

Embodiments Embodiments will be described below with reference to the drawings.

The injection needle removing unit 10 comprises a plurality of claw members 11, 11 ... And a rotary base 12 on which the claw members 11, 11 ... Are mounted via a guide block 13 (FIG. 1). The base 12 is incorporated between an upper plate 14 and a lower plate 15 so as to be vertically movable.

The upper plate 14 and the lower plate 15 have set screws 1 at both ends.
6a, 16a screw type spacer rod for inserting,
16 are assembled in parallel vertically (FIGS. 1 and 2). The upper plate 14 is a disc having a through hole 14a in the center, and the lower plate 15 has a through hole 15a in the center.
It is a disk forming gear teeth 15b on the outer circumference. The lower surface of the lower plate 15 has a boss-shaped step portion 15 around the through hole 15a.
c is formed.

The rotary base 12 has an annular groove 12 on the outer circumference.
It is a disk having a (FIGS. 2 and 3). Rotating base 12
Are formed on the outer peripheral portion of the spacers so as to correspond to the spacer rods 16, 16 ... And each spacer rod 16 is slidable with respect to the corresponding through hole 12b. It has been inserted.

A star-shaped guide block 13 is formed in the center of the rotary base 12, and the guide block 13
Are formed on the upper surface of each of them in a radial shape. A through hole 13b reaching the lower surface of the rotation base 12 is formed in the center of the guide block 13. The guide block 13 may be mounted on the upper surface of the rotation base 12 separately from the rotation base 12 instead of being formed integrally with the rotation base 12. However, in the latter case, a through hole continuous with the through hole 13b is provided in the central portion of the rotary base 12.

The claw members 11, 11 ... Include the guide block 1
3 is a plate-like member that is slidably housed in the guide grooves 13a, 13a ... (FIGS. 3 and 4). The tip of each claw member 11 is sharpened into an isosceles triangle, and a groove 11a is formed which opens toward the tip. Further, a locking pin 11b protruding leftward and rightward is attached to the rear end portion of the claw member 11. Both ends of the locking pin 11b are provided with cam grooves 17a and 17 of a pair of fixed cam plates 17 and 17 vertically provided on the lower surface of the upper plate 14.
It is engaged with a. However, each cam groove 17a is composed of a combination of a straight portion in the upper portion and a diagonal portion in the lower portion, and the lower portion is an elongated hole that is bent outward.

Instead of the elongated holes, the cam grooves 17a, 17a may be formed with opposed grooves in which the opposite ends of the locking pin 11b engage with each other inside the fixed cam plates 17, 17. Further, the locking pin 11b may be omitted by forming the projections that project to the left and right of the claw member 11 integrally with the claw member 11. Further, the fixed cam plates 17, 17 ... May be erected on the upper surface of the lower plate 15 instead of being erected on the lower surface of the upper plate 14.

Therefore, the claw members 11, 11 ...
4. When the rotation base 12 is moved up and down in parallel with respect to the lower plate 15, the locking pin 11b of each claw member 11 is moved to the cam groove 17
By engaging with the cam grooves 17a, 17a,
According to the shape of 17a, it can be moved back and forth along the corresponding guide groove 13a (FIG. 5). That is,
The claw members 11, 11 ... Should be in the forward position all at once when the rotation base 12 is in the ascending limit (solid line in the figure), and should be in the retract position all at once when the rotation base 12 is in the descending limit. Can be done (two-dot chain line in the figure). Also, the claw member 11,
11 can maintain the forward movement position when the rotation base 12 is above the intermediate position (dotted line in the figure). This is because the upper portions of the cam grooves 17a, 17a ... Are straight portions. In addition, at the upper limit and the lower limit of the rotation base 12, the locking pin 11b of each claw member 11 is
It is regulated by being located at the upper and lower ends of the corresponding cam grooves 17a, 17a.

By incorporating the injection needle removing unit 10 into the casing C, an injection needle removing device can be constructed (FIGS. 1 and 2).

The removal unit 10 includes a set screw 18a,
By fixing the disc 18 to the lower surface of the lower plate 15 via 18a ..., With respect to the intermediate plate C1 inside the casing C,
It is assembled so that it can rotate freely. However, the intermediate plate C1 is formed with a large-diameter through hole C1a into which the boss-shaped step portion 15c of the lower plate 15 is rotatably fitted, and the lower plate 15 and the intermediate plate C1 and the intermediate plate C1 and the circular plate are formed. Ring-shaped sliding plates C1b, C1b are interposed between the 18's. A waste pot D having a charging port D1 is removably loaded under the intermediate plate C1, and the charging port D1 is located directly below the through hole 15a in the central portion of the lower plate 15.

On the upper surface of the intermediate plate C1, the removal unit 1
A drive mechanism 20 for driving 0 is assembled.

The drive mechanism 20 has a motor 21, a drive gear 22, a rotary shaft 23, and a pair of swing arms 24, 24 as main components.

The drive gear 22 has a boss that rotatably penetrates the intermediate plate C1, and the intermediate plate C is inserted through a set screw 22a.
By fixing the disc 22b so that 1 is sandwiched, it is rotatably attached to the intermediate plate C1. Further, ring-shaped sliding plates C1c and C1c are interposed between the intermediate plate C1 and the drive gear 22 and the circular plate 22b. The drive gear 22 meshes with the gear teeth 15b of the lower plate 15 on the upper surface of the intermediate plate C1. An auxiliary gear 22c is formed above the drive gear 22.
2c is meshed with a cylindrical gear 21a fixed to the shaft end of the motor 21. Therefore, the lower plate 15 is connected to the drive gear 2
2, the auxiliary gear 22c, the cylindrical gear 21a, the motor 2
It is connected to 1.

The rotary shaft 23 is rotatably supported on the upper surface of the intermediate plate C1 via a bracket (not shown). A worm wheel 23b is fixed to an intermediate portion of the rotary shaft 23, and rotary disks 23c and 23c having eccentric pins 23c1 are fixed to both ends thereof. The rotary shaft 23 includes a cylindrical gear 21a at the shaft end of the motor 21, auxiliary gears 21b and 21c that are vertically connected, another auxiliary gear 21d and the worm 2.
The motor 21 can be rotationally driven in one direction via the 1e and the worm wheel 23b.

An eccentric pin 2 is attached to one end of each swing arm 24.
An elongated hole 24a with which 3c1 is engaged is formed. Also,
Each swing arm 24 is swingably supported by a bracket 24b protruding from the upper surface of the intermediate plate C1 via a pin 24c. In addition, at the tip of each swing arm 24,
The drive pin 24d is mounted toward the inside. The drive pins 24d, 24d engage with the concave groove 12a formed on the outer periphery of the rotation base 12 in the diametrical direction of the rotation base 12, and support the rotation base 12.

When the motor 21 is rotated, the detaching unit 10 is rotated via the drive gear 22 and the lower plate 15, so that the claw members 11, 11 ... Can also be rotated together with the detaching unit 10. On the other hand, at this time, since the rotary shaft 23 also rotates in one direction, the swing arms 24, 24
Through the eccentric pins 23c1 and 23c1 to the pin 24c,
Therefore, the rotary base 12 supported by the drive pins 24d and 24d can be vertically reciprocated. Therefore, the claw members 11, 11, ... On the rotation base 12 can be in the forward movement position and the backward movement position in correspondence with the vertical movement of the rotation base 12. However, the top dead center and the bottom dead center of the rotation base 12 by the swing arms 24, 24 are set to the cam groove 17
It is assumed that the rotation base 12 is set to meet the ascending limit and the descending limit of the rotation base 12 regulated by a, 17a, ....

That is, the claw members 11, 11 ... Can be rotated as a whole by rotationally driving the removal unit 10 via the motor 21, and at the same time, the rotation base 12 is moved up and down to move to the forward position. And can be driven to the retracted position.

The casing C is composed of a main body having an intermediate plate C1 and a removable cover plate C2 in combination. The cover plate C2 is located directly above the removing unit 10 and is a guide suitable for the used syringe A. A cylinder C3 is projected.

The used syringe A is assumed to be a blood sampling device, and the holder A1 and the injection needle A screwed to the holder A1.
It consists of 2 and. The base of the injection needle A2 is provided with a screw drive portion A2a that forms a wing-shaped engagement protrusion in a cross shape in all directions. An auxiliary needle A2c with a rubber cover A2b is attached above the injection needle A2.
Can collect blood by attaching the injection needle A2 to the holder A1, inserting the injection needle A2 into the blood vessel, and inserting a blood collection container consisting of a vacuum container into the holder A1 and piercing the bottom of the blood collection container. .

An engaging portion C3 that engages with the flange A1a of the holder A1 and prevents the holder A1 from rotating at the upper end of the guide cylinder C3.
a and C3a are formed. Further, an auxiliary guide cylinder C3b is vertically provided below the guide cylinder C3, and a lower end of the auxiliary guide cylinder C3b is close to the upper plate 14 of the detaching unit 10.

Now, when the rotary base 12 is placed at the top dead center, the claw members 11, 11 ... Are set to the forward position and the syringe A with the injection needle A2 is inserted into the guide cylinder C3, the guide cylinder C3 is inserted.
Can store and position the holder A1.
At this time, the lower end of the holder A1 has a through hole 14 in the upper plate 14.
The needle A2 penetrates the inside of the detaching unit 10 from the top to the bottom while advancing to a, and the tips of the claw members 11, 11 ... Can be engaged with the screw drive portion A2a of the needle A2 ( (Solid line in FIG. 5).

Subsequently, the motor 21 is activated and the injection needle A
By rotating the claw members 11, 11 ... in the direction in which 2 comes off,
The injection needle A2 has a loose screw connection with the holder A1 and can be removed from the holder A1. Also, the claw members 11, 1
1 ... rotate base 12 as injection needle A2 comes off.
Since it moves downward together with it, there is no risk of preventing the injection needle A2 from coming off.

The claw members 11, 11 ... Set the reduction ratios between the motor 21, the removal unit 10 and the rotary shaft 23, the moving amount of the rotary base 12, and the shapes of the cam grooves 17a, 17a. , The screw drive part A2a is rotated by a sufficient number of rotations until the injection needle A2 is disengaged from the holder A1 by the time it moves downward while maintaining the forward position and reaches the intermediate position (dotted line in Fig. 5). To do. Also, the claw member 11,
11 ... is assumed to move downward a little faster than the advancing speed when the injection needle A2 rotates and the injection needle A2 advances downward according to the screw lead. Therefore, the claw member 1
1, 11, ... Are the injection needles A2 before reaching the intermediate position.
Can be removed from the holder A1, and thereafter, as the rotary base 12 descends to the bottom dead center, the cam groove 17
It is possible to move to the retracted position all at once via a, 17a, ... And to release the engagement with the screw drive portion A2a. Therefore, the injection needle A2 removed from the holder A1 can be dropped into the waste pot D via the input port D1.

In this way, from the holder A1 to the injection needle A2
After removing the holder, the holder A1 may be removed from the guide cylinder C3 and discarded. The motor 21 continues its operation thereafter, and stops when the rotation base 12 returns to the top dead center, and prepares for the next processing of the syringe A.

In the above description, the syringe A may be a general syringe composed of an injection cylinder and an injection needle attached to the injection cylinder, instead of a blood sampling device. At this time, the holder A1 is to be read as the injection cylinder A1.

A series of operations for driving the rotary base 12 waiting at the top dead center via the motor 21 and returning it to the top dead center via the bottom dead center are performed by using an appropriate sensor, for example. , The motor 21 is automatically started when the holder A1 is inserted into the guide cylinder C3, and the motor 21 is automatically stopped upon detecting that the rotary base 12 has returned to the top dead center. If the rotation base 12 is lowered to the intermediate position and the removal of the injection needle A2 is detected, and this is displayed, the removal of the injection needle A2 is completed while the motor 21 completes one cycle of operation. At the same time, the holder A1 can be removed from the guide cylinder C3, and the operating procedure for handling the used syringe A can be further facilitated. Further, even when a predetermined number or more of injection needles A2 are accommodated in the waste box D, a display for replacing the box D may be displayed.

Further, the motor 21 may be driven not only by a commercial power source but also by an independent battery power source, and the drive mechanism 20 drives the upper plate 14 instead of driving the lower plate 15. You may do it. The drive mechanism 20 rotates the removal unit 10 and
It suffices if the rotation base 12 can be driven up and down,
The specific configuration is arbitrary. Further, the claw member 1
The guide grooves 13a for accommodating 1, 11 ... Can be directly formed on the rotary base 12 without using a special guide block 13.

It should be noted that the nail members 11, 11 ... Can be arbitrarily matched to the shape of the injection needle A2 as long as the tip thereof engages with the screw driving portion A2a of the injection needle A2 and can rotate the injection needle A2. It can be transformed into Further, the present invention is
Since the claw members 11, 11 ... Rotate the injection needle A2, the invention can be applied to not only the screw connection injection needle A2 but also the fitting connection injection needle. However, the claw members 11, 11 ... At this time press the outer periphery of the cylindrical fitting coupling portion of the injection needle A2 from four directions,
In order to rotate the injection needle A2 without slipping, the tip of the needle A2 can be recessed, and the tip or the whole can be made of an elastic material having a high friction coefficient. Also,
It suffices to arrange any number of the claw members 11, 11 ... In a radial manner.

[0039]

As described above, according to the present invention, the rotary base having the guide groove, the plurality of claw members housed in the guide groove, and the fixed cam plate for driving the claw members back and forth are provided. Since the claw member is driven via the cam groove of the fixed cam plate, by appropriately setting the shape of the cam groove, the claw member can be securely attached to the screw drive part of the injection needle until the removal of the injection needle is completed. Can be engaged,
Therefore, there is an excellent effect that there is no possibility that the removal of the injection needle becomes uncertain and the tip of the claw member is damaged early.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a usage state.

FIG. 2 is an explanatory view of the entire vertical section

FIG. 3 is an exploded perspective view of essential parts

FIG. 4 is an overall cross-sectional explanatory view

[Fig. 5] Operation explanatory diagram

[Explanation of symbols]

 A2 ... Injection needle A2a ... Screw driving part 11 ... Claw member 12 ... Rotation base 13 ... Guide block 13a ... Guide groove 14 ... Upper plate 15 ... Lower plate 16 ... Spacer rod 17 ... Fixed cam plate 17a ... Cam groove

Claims (3)

[Claims] 1. A rotary base having a radial guide groove that moves up and down while rotating, a plurality of claw members slidably accommodated in the guide grooves, and the claw members via cam grooves. A plurality of fixed cam plates that are driven back and forth, and when each of the claw members is moved up, the tip of the claw member is in the forward position where it engages with the screw drive portion of the injection needle, An injection needle removal unit, characterized in that, when the needle is lowered, the retracted position is such that the tip end comes off the screw drive part. 2. The needle needle removing unit according to claim 1, wherein the guide groove is formed in a guide block on the rotation base. 3. The needle needle removing unit according to claim 1, wherein the rotary base is vertically movably installed between an upper plate and a lower plate connected via a spacer rod.