JPH05111476A - Driving device for blood collecting device - Google Patents

Abstract

PURPOSE:To enable sucking and collecting of a slight amt. of blood from a capillary blood vessel without giving a strong stimulus and a fear feel to a patient. CONSTITUTION:A movable body 8 extendedly provided with a working rod 11 onto which a working cylinder 17 is unpullably and freely advanceably and retractably built is positioned freely advanceably and retractably at the front end of a piston 10 within a casing 1 having a straight cylindrical shape and further, a puncture needle 30 is disposed near the front end of the working cylinder 17. This device is so constituted that the puncture needle 30 can rapidly be advanced by magnetic force and that the blood can be sucked by generating a negative pressure in the inside at the time of retreating of the movable body 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a blood collecting device for collecting a small amount of blood.

[0002]

2. Description of the Related Art A medical examination of blood is essential for medical treatment, and it is always necessary to collect a predetermined amount of blood from a patient. And, as the means for collecting blood, conventionally, a case where blood is drawn from a vein with an appropriate syringe, a fingertip,
In most cases, the skin such as an ear lobe was damaged and a few drops of blood were collected.

The former means, especially when a certain amount of blood is collected, gives a feeling of pain and fear at the time of puncturing, and has a disadvantage that it must be done by a specialist such as a doctor or a nurse. However, it is indispensable for multi-item inspections, but is not frequently performed. On the other hand, the latter means is particularly adopted at the time of a diabetes test, and a small amount of blood can be collected at one time, but it is frequently done.

That is, as is well known, in diabetic diseases, the blood glucose concentration in the blood of a patient must be constantly monitored, and the blood sampling frequency is high, for example, before meals, after meals, and before bedtime. In some cases, it goes up to 7 times a day. A small amount of blood can be collected for each blood glucose concentration test, but the burden on the patient is extremely large because it is frequent. This burden is, for example, pain and fear at the time of puncture, but blood cannot be collected except from sensitive fingertips of the nerves or earlobe, so this burden is doubled, and in the case of frequently used fingertips, after blood collection. There are also many scars left behind, and there is also the problem that infection is likely to occur due to the invasion of bacteria.

In order to reduce such a burden on the patient as much as possible, the prior art is disclosed in, for example, Japanese Patent Laid-Open No. 1-185245.
Alternatively, the invention disclosed in JP-A-62-38140 has been proposed.

[0006]

However, the former invention does not alleviate the burden on the patient in the prior art in that blood is collected from the fingertip, and the puncture needle utilizes the elastic force of the contracted coil spring. Is to move forward,
The puncture action of the puncture needle is strong, and the fear of pain and especially sound and vibration cannot be eliminated. Further, in this configuration, the structure for ensuring the operation of the coil spring is complicated, and it takes time to assemble, and further, in operation, a preliminary operation of temporarily compressing the spring is required, which makes it difficult to handle. Become.

In this respect, the latter invention is capable of collecting blood even at a portion other than the fingertip, and by drawing a certain negative pressure in the blood collecting device, the blood can be sucked out from the portion damaged by the puncture needle. Although the location is not limited and the burden and pain of the wound is reduced, the advancement of the puncture needle uses the elastic force of the coil spring as in the case above, so the problem pointed out in the former invention is solved. Is not. Further, the structure must be such that a negative pressure state can be obtained by a predetermined operation, and therefore the structure is further complicated.

Therefore, the present invention was developed to solve the above-mentioned drawbacks, inconveniences and problems of the prior art.
A small amount of blood can be collected from capillaries without giving a strong irritation or fear to the patient, and the collected blood can be blown out onto the skin.

[0009]

SUMMARY OF THE INVENTION The present invention is a blood-collecting device drive device in which a peripheral edge of a distal end surface can be brought into close contact with skin, and a puncture needle is projected from a distal end by a predetermined forward operation, and the device is sealed at a proximal end portion. A cylindrical tubular portion is provided, a guide passage having a reduced diameter is extendedly communicated with the tip of the cylinder tubular portion at the axial center position, and a first magnet is provided on the tip end wall surface of the guide passage. A movable body in which a piston is provided at the tip of a casing and a cylinder rod penetrating through the base end of the cylinder tubular portion of the casing so as to move forward and backward in the cylinder tubular portion, and an action rod is extendedly provided at the tip of the piston. And the action rod of the movable body cannot be pulled out and is installed in the base end part so that it can move forward and backward, and the second magnet is installed in the tip part so that it can be moved forward and backward in the guide passage of the casing. When, is composed of a puncture needle that is disposed near the distal end of the working cylinder, at a predetermined forward position of the working cylinder,
The action cylinder can be rapidly advanced by the mutual magnetic force between the first magnet of the casing and the second magnet of the action cylinder.

In the retracted posture of the action cylinder, the first magnet is located near the base end, the second magnet is located near the tip end, axially opposed to each other, and the polarity on the base end side of the first magnet is , The same polarity as the tip side of the second magnet.

Alternatively, when the action cylinder is in the retracted posture, the first magnet and the tip end of the second magnet are radially opposed to each other, and the polarity of the first magnet on the base end side is opposite. And the polarity on the tip side of the second magnet is different.

Further alternatively, the first magnet and the second magnet are directly opposed to each other in the radial direction in the retracted posture of the action cylinder, and the polarity on the base end side of the first magnet is equal to the second magnet. The polarity of the tip side of the magnet is the same.

Further, a pressing body is movably moved forward and backward in the base end portion of the assembling cylinder having both ends opened, which is assembled in a posture extending to the base end of the casing, in a posture projecting from the base end of the assembling cylinder. Assembling, an elastic material that repels in the axial direction is arranged between the assembling cylinder and the pressing body, and further, the base end of the cylinder rod of the movable body is attached to the pressing body.

The first magnet of the casing may have a ring shape and may be concentrically arranged in the guide passage.

The puncture needle is fixed to the tip of the working cylinder.

Alternatively, a fitting cylinder portion is provided at the tip of the casing, and the puncture needle protruding from the tip of the fitting cylinder portion of the casing cannot be pulled out due to the forward movement of the working cylinder into the cylinder body that is tightly fitted in the fitting cylinder portion. It may be configured so that it can be moved forward and backward.

[0017]

Therefore, when the cylinder rod of the movable body penetrating the base end of the cylinder tube portion is advanced in the tip direction, the action rod extended to the tip also advances, and the action rod has the tip of the second magnet. And the working cylinder is advanced in the guide passage of the casing.

In the standby stage before advancing the movable body, FIG.
As shown in the above, the second magnet in the working cylinder located closer to the base end when viewed from the whole and the first magnet on the wall surface of the casing front end located closer to the tip when viewed from the whole are opposed to each other along the axial direction. In such a posture, if the polarity of the first magnet on the base end side and the polarity of the second magnet on the front end side are made the same, the magnetic repulsion between them will occur.

Nevertheless, when the movable body is forcibly moved forward, the first magnet and the second magnet are located substantially opposite to each other in the radial direction. Then, since the base end side of the first magnet and the base end side of the second magnet, and the tip end side of the first magnet and the tip end side of the second magnet have different polarities, they are mutually magnetic. , The second magnet advances away from the action rod at the tip of the movable body that was in contact with the advance of the movable body,
Along with this, in the working cylinder containing the second magnet, only the working cylinder advances independently and rapidly in the guide passage due to the forward movement of the second magnet. In this case, since the working rod is housed in the working cylinder so that it cannot be pulled out and can be moved forward and backward, the working cylinder does not pop out forward.
The amount of protrusion is also regulated.

Therefore, at the time of collecting blood, when the distal end surface of the casing is strongly pressed against the skin to move the movable body forward, the first magnet and the second magnet are magnetically attracted to each other at a certain stage, so that the action cylinder is formed. It rapidly advances, and the puncture needle arranged near the tip of the action cylinder is projected from the tip of the casing to pierce the skin.

When the puncture needle and the movable body are retracted,
Due to the action of the piston, the inside of the guide passage is in a negative pressure state, part of the skin rises in the tip of the casing, and a small amount of blood gushes from the capillaries at the skin puncture site.

In the standby stage before advancing the movable body, FIG.
As described above, the retracting posture of the working cylinder is set such that the base end of the first magnet and the tip end of the second magnet are positioned to face each other in the radial direction, and the polarity on the base end side of the first magnet is set. When the polarity of the second magnet on the front end side is made different, both magnets magnetically attract each other in this state posture, and a temporary stable state is obtained.

Therefore, when the movable body is forcibly moved forward to displace the second magnet, the poles of the first magnet and the poles of the second magnet are opposed to each other in the radial direction, so that they are magnetically magnetic from each other. To the position where the distal end of the first magnet and the proximal end of the second magnet face each other in the radial direction, that is, both magnets again The action cylinder is rapidly advanced until the magnetically attracting posture, and the puncturing operation similar to the above is performed.

Alternatively, in the standby stage before advancing the movable body, as shown in FIG. 6, the retracting posture of the working cylinder is set so that the first magnet and the second magnet are directly opposed to each other in the radial direction. However, if the polarities of the base end side of the first magnet and the front end side of the second magnet are made different, both magnets magnetically attract each other even in this state posture, and a stable state is obtained. become.

Therefore, when the movable body is forcibly advanced to displace the second magnet, the tip end of the first magnet and the base end of the second magnet, which have the same polarity, face each other in the radial direction. Therefore, the posture in which the second magnets repel each other and the second magnet passes through the inside of the first magnet and is fully charged and separated in the tip direction of the first magnet, that is, both magnets do not affect each other magnetically. Until, the action tube rapidly advances and the puncturing operation similar to the above is performed.

When the pressing body is assembled to the assembly cylinder extendedly assembled to the base end of the casing, the movable body can be easily moved forward, and the assembly cylinder and the pressing body are repelled in the axial direction. If the elastic material is arranged and the base end of the cylinder rod is attached to the pressing body, the backward movement and return of the movable body after the puncture can be quickly achieved.

If the ring-shaped first magnets are concentrically arranged in the guide passage, the working cylinder containing the second magnet will pass through the first magnet. The mutual magnetic influence of the magnet and the second magnet becomes more reliable, and the desired operation is obtained.

If the puncture needle is fixed to the tip of the action tube, the puncture operation is directly performed by the forward movement of the action tube.

Alternatively, if the puncture needle is housed so that it cannot be pulled out and can be moved forward and backward in a cylinder that is tightly fitted in the fitting cylinder provided at the tip of the casing, the tip of the action cylinder fits into the casing. The puncturing operation is indirectly performed by projecting into the coupling tube portion and advancing the action tube.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. The linear cylindrical casing 1 has a base end portion which is a cylinder cylinder portion 2 whose base end is open, and a distal end portion which is a fitting cylinder portion 3 whose end is open. 2 is provided with a small-diameter guide passage 5 that communicates with the fitting tubular portion 3, and a ring-shaped first magnet 6 is concentrically formed with the guide passage 5 on the wall surface of the tip end portion of the guide passage 5. The guide passage 5 is embedded so as not to be embedded in the guide passage 5.

The first magnet 6 is a permanent magnet, as shown in FIG.
In the case of the embodiment shown in FIG. 3, the polarity of the casing 1 on the base end side is N pole and the polarity on the tip end side is S pole.

As a result of the guide passage 5 having a small diameter, the suction force at the time of negative pressure can be generated more effectively,
Further, the contact step portion 7 is formed in the continuous portion with the cylinder tubular portion 2. Furthermore, the inner peripheral surface of the fitting tubular portion 3 is a tapered wall whose diameter increases toward the tip.

The movable body 8 is provided with a disc-shaped piston 10 having an outer diameter substantially equal to the inner diameter of the cylinder tube portion 2 at the tip of the cylinder rod 9, and the tip of the piston 10 is larger than the inner diameter of the guide passage 5. The working rod 11 having a sufficiently small diameter is extendedly provided, and the O-ring 12 is mounted on the circumferential surface of the piston 10. The male rod is circumferentially provided on the circumferential surface of the base end portion of the cylinder rod 9, and the working rod 11 is provided. The front end of the cylinder is an expanded diameter locking portion 13, and the cylinder rod 9 and the piston 10 can move forward and backward in the cylinder tube portion 2, and the working rod 11 can move forward and backward in the guide passage 5. By mounting the O-ring 12, not only the operation of the movable body 8 becomes smooth but also negative pressure suction becomes more reliable.

The assembling cylinder 14 which is extendedly assembled by tightly fitting the tip end into the base end of the casing 1 has a tubular shape with both ends open, and the inner diameter is reduced in three steps from the base end to the tip. The inner diameter of the tip portion is substantially equal to the outer diameter of the cylinder rod 9, and the inner diameter of the base end portion is substantially equal to the outer diameter of the pressing body 15.

The cylindrical pressing body 15 whose base end is closed is
The assembly cylinder 14 is assembled in the base end portion of the assembly cylinder 14 so as to be able to move forward and backward while projecting from the base end of the assembly cylinder 14, and is screwed into the male screw thread of the cylinder rod 9 in the base end portion. The inner diameter of the distal end portion, which is expanded by encircling the female screw thread, is equal to the inner diameter of the central portion of the assembling cylinder 14 described above. Therefore, the cylinder rod 9 is screwed into the proximal end portion of the pressing body 15, and the pressing body 15 is assembled into the assembling cylinder 14 so as to project from the proximal end. The elastic member 16 made of a coil spring is arranged in the gap formed in the base end portion of the above to repel the assembling cylinder 14 and the pressing body 15 in the axial direction.

In this case, the pressing body 15 and the cylinder rod 9
It is possible to change the length of the cylinder rod 9 and adjust the elastic force and the suction force of the elastic material 16 by adjusting the screwing form with. That is, if the elastic force of the elastic material 16 is loosened, the pressing resistance against the pressing body 15 is weakened, so that the fear can be eased when the blood collection operation is performed by itself. However, when the elastic body is restored and the pressing body 15 is retracted, it is necessary to adjust so that a suction force to the extent that a negative pressure is surely generated in the cylinder tubular portion 2 can be generated. Further, when the length of the cylinder rod 9 becomes shorter, the reciprocating stroke of the piston 10 becomes smaller, so that the suction force becomes weaker.

Next, the working cylinder 17 is a straight cylinder which is slightly longer than the guide passage 5 of the casing 1 and has an outer diameter substantially equal to the inner diameter of the guide passage 5, and the diameter of the base end opening is the action of the movable body 8. The outer diameter of the rod 11 is equal to the outer diameter of the rod 11. Therefore, when the working rod 11 is assembled, the locking portion 13 at the distal end of the working rod 11 locks at the base end to prevent the working rod 11 from slipping out. It can move forward and backward freely.

The second magnet 18 housed in the tip of the working cylinder 17 is a permanent magnet, and in the case of the embodiment shown in FIG. 4, the polarity on the base end side of the working cylinder 17 is the S pole. , And the polarity on the tip side is N pole.

The operation of the working cylinder 17 of the embodiment shown in FIG. 4 is as follows. When the movable body 8 retracts, the action cylinder 17
The second magnets 18 in the inside are located closer to the base end, and the first magnets 6 on the wall surface of the tip end portion of the casing 1 are located closer to the tip end and face each other along the axial direction. (Fig. 4a). Then, when the movable body 8 is moved forward, the different poles of the first magnet 6 and the second magnet 18 magnetically attract each other, and the first magnet 6 and the second magnet 18 move in the radial direction. The second magnet 18 is forwardly displaced to a position directly opposite (Fig. 4b), and only the action cylinder 17 independently and rapidly advances in the guide passage 5 during this displacement.

The operation of the working cylinder 17 of the embodiment shown in FIG. 5 is as follows. When the movable body 8 is retracted, the base end of the first magnet 6 serves as an N pole, the tip end of the second magnet 18 serves as an S pole, and the base end and the tip end are radially opposed to each other. It is magnetically attracted to and is in a stable state (Fig. 5a). Then, when the movable body 8 is moved forward, the first magnet 6
And the second magnet 18 have the same poles repelling each other, the second magnet 18 passes through the inside of the first magnet 6, and the tip of the first magnet 6 and the base of the second magnet 18 The second magnet 18 is displaced forward (FIG. 5b) until the ends are opposed to each other in the radial direction, that is, until the two magnets are again in a position to magnetically attract each other (FIG. 5b). Independently and rapidly advances in the guide passage 5.

Further, the working cylinder 17 of the embodiment shown in FIG.
The operation of is as follows. When the movable body 8 is retracted, the tip of the first magnet 6 serves as an N pole and the tip of the second magnet 18 serves as an S pole, which are directly opposed to each other in the radial direction and magnetically attract each other. Is stable (FIG. 6a). Then, when the movable body 8 is moved forward, the same poles of the first magnet 6 and the second magnet 18 repel each other, and the second magnet 18 passes through the inside of the first magnet 6, The second magnet 18 is displaced forward until the first magnet 6 is fully charged and separated in the distal direction, that is, until both magnets have a posture in which they do not affect each other magnetically (see FIG. 6).
b) At the time of this displacement, only the action cylinder 17 independently and rapidly advances in the guide passage 5.

Next, in the simplest configuration, the puncture needle 30 may be fixed directly to the tip of the working cylinder 17. In this case, the tip of the puncture needle 30 is set to protrude from the tip of the casing 1 by a desired amount at the forward limit of the action cylinder 17. Although this configuration is simple, there is a problem in that replacement of the puncture needle 30 is troublesome.

Therefore, in the illustrated embodiment, the blood reservoir 19 as a cylinder that is tightly fitted in the fitting cylinder 3 of the casing 1.
The puncture needle 30 is housed inside, and the puncture needle 30 can be replaced by replacing the blood reservoir 19.

That is, the blood reservoir 19 has a function of puncturing the skin with the puncture needle 30 and sucking and storing blood. At the same time, the blood puncture needle 30 holds the puncture needle 30 and advances the movement from the action cylinder 17. It is surely transmitted to 30.

The blood reservoir 19 has a fitting cylindrical portion 20 having a base end portion which is closely fitted into the fitting cylindrical portion 3 of the casing 1 and a distal end portion having a thick peripheral wall 21 and having a substantially cylindrical shape. The base end face is provided with an opening 22 into which the forward end of the advancing cylinder 17 can enter at least a desired amount, and a flat recessed face is provided with a tapered recess 23. With a structure in which a through hole 24 that communicates with the through hole 24 is provided, a short tubular projection 25 is provided on the peripheral edge of the concave portion 23 of the distal end surface, and a tubular guide tubular portion 26 that communicates with the through hole 24 is provided inside along the axial direction. Set up.

The blood reservoir 19 is formed in a cylindrical shape by providing a notch 27 substantially eccentrically along the axial direction, and the tip end face of the notch 27 is formed as a back surface of the tapered concave portion 23 at the peripheral edge. Inclining downwards. Therefore, blood clot 19
When the blood is sucked from the guide tube portion 26 provided at the center of the blood, the blood is concentrated on the base end portion of the notch 27 having an extremely small volume, which facilitates the inspection and prevents the unnecessary collection of blood. it can. In addition, the peripheral wall 21 portion of the cutout 27 may be formed as a transparent window hole 28. It should be noted that the fitting tubular portion 20 has a cylindrical shape, and a step portion 29 is formed in a continuous portion with the peripheral wall 21, which is substantially the tip portion.

A disc-shaped sliding piece 31 is attached to the proximal end of the puncture needle 30.
Is integrally provided, and the sliding piece 31 serves as the blood reservoir 19 described above.
The cylindrical portion of the fitting tubular portion 20 is moved forward and backward along the axial direction, and the body of the puncture needle 30 is always located in the guide tubular portion 26 and simultaneously moved forward and backward. Then, between the base end surface of the sliding piece 31 and the step portion 29 of the blood reservoir 19,
A puncture needle 30 is provided so as to prevent the puncture needle 30 from slipping out in the proximal direction by disposing an elastic material 32 that repels in the axial direction and providing a stopper 33 at the proximal end of the fitting tubular portion 20 of the blood reservoir 19. 30 is biased in the proximal direction. However, although this stopper 33 prevents the puncture needle 30 from coming off, it must be opened so that it does not hinder the forward end of the working cylinder 17 from entering a predetermined amount.

At the stage before the start of use, it is advisable to attach the adhesive seal 34 to the distal end surface of the blood reservoir 19.

The driving device for the blood sampling device of the present invention, in which the above-mentioned members are assembled, operates as follows. That is, in FIG. 1, the pressing body 15 retreats due to the repulsive force of the elastic material 16 by the coil spring, and the movable body 8 also retracts accordingly, so that the action cylinder 17 retreats, and its base end portion is the cylinder cylinder. The tip of the second magnet 18 is located inside the portion 2, and the tip of the second magnet 18 is located inside the guide passage 5. The first magnets 6 are close to the ends and close to the ends, and face each other along the axial direction (state of FIG. 4a).

From this state, the adhesive seal 34 is peeled off,
When the protrusion 25 provided on the distal end surface of the blood reservoir 19 is strongly pressed against the skin A and the pressing body 15 is advanced against the repulsive force of the ammunition material 16, the first magnet 6 and the first magnet 6 are moved at predetermined positions. Second magnet 18
Magnetically attract each other, and only the action cylinder 17 is rapidly advanced so that the tip end thereof slides on the slide piece 3 of the puncture needle 30 in the blood reservoir 19.
1 and the puncture needle 30 is advanced to move the puncture needle 3
No. 0 protrudes from the through hole 24, and as shown in FIG.
It projects from 3. Therefore, the amount of protrusion of the tip of the puncture needle 30 can be arbitrarily adjusted by the length of the puncture needle 30, the length of the blood reservoir 19 along the axial direction, the amount of protrusion of the action cylinder 17, and the like.

When the puncture needle 30 protrudes and punctures the skin A, if the pressure on the pressing body 15 is released, the pressing body 15 will immediately retreat and return due to the repulsive force of the ammunition material 16. 17 also retreats back. And the action cylinder 17
Due to the retraction, the puncture needle 30 also retreats due to the repulsive force of the bullet 32, and comes out of the skin A.

When the movable body 8 retracts as the pressing body 15 retreats, the piston 10 acts to create a negative pressure in the cylinder tube portion 2 and a negative pressure in the recess 23. Therefore, the skin A portion after the puncture needle 30 is pulled out rises and is sucked into the recess 23 as shown in FIG. 3, and a small amount of blood from the puncture wound is cut through the through hole 24 and the guide tube portion 26. It collects in the tip of the notch 27.

[0053]

As described above, according to the present invention, since the puncture needle for puncturing the skin is located inside and cannot be visually recognized from the outside, there is no fear of the patient during operation, and the magnetic force is utilized. Since it is moved forward, the impact such as vibration is small, there is no sound, and it is achieved instantly. Therefore, also in this respect, the fear can be minimized. And blood collection after puncture is
Since it is achieved by negative pressure suction at the same time as retracting the puncture needle, the puncture site is not limited to the sensitive fingertip or earlobe of the nerve, and can be performed from a capillary blood vessel such as an arm. Furthermore, at the time of puncturing, pressure around the puncture site is stimulated to stimulate pain points, and the sensation of pain points in the local area where puncture is actually performed is blunted. is there.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along the axial direction showing a state before the use of a blood collecting device of the present invention.

FIG. 2 is a cross-sectional view showing a limit of advancement of a puncture needle.

FIG. 3 is an enlarged cross-sectional view showing a suctioned state of blood after puncture.

FIG. 4 is a cross-sectional view showing an embodiment of the mutual positional relationship between the first magnet and the second magnet, in which a is a state before the operation and b is a state after the operation.

FIG. 5 is a cross-sectional view showing another embodiment of the mutual positional relationship between the first magnet and the second magnet, in which a is the state before the operation and b is the state.
Indicates the state after the operation.

FIG. 6 is a cross-sectional view showing still another embodiment of the mutual positional relationship between the first magnet and the second magnet, in which a shows the state before the operation and b shows the state after the operation.

[Explanation of symbols]

1; casing, 2; cylinder cylinder part, 3; fitting cylinder part,
5; guide passage, 6; first magnet, 8; movable body, 9; cylinder rod, 10; piston, 11; working rod, 1
4; Assembly cylinder, 15; Pressing body, 16; Ammunition material, 17; Working cylinder, 18; Second magnet, 19; Blood reservoir, 20; Fitting cylinder part, 21; Peripheral wall, 22; Opening part, 23 Recessed portion, 24; through hole, 25; protrusion, 26; guide tube portion, 30; puncture needle, 3
2; ammunition.

Claims (8)

[Claims] 1. A driving device of a blood sampling device, wherein a peripheral edge of a distal end surface can be brought into close contact with skin, and a puncture needle (30) is projected from a distal end by a predetermined forward operation. 2) is provided, and a guide passage (5) having a reduced diameter is extendedly communicated with the tip of the cylinder tubular portion (2) at the axial center position, and the guide passage (5) is further provided.
A straight cylindrical casing (1) provided with a first magnet (6) on the wall surface of the distal end of the cylinder (1) and a forward / backward movement into the cylinder cylindrical portion (2) through the base end of the cylinder cylindrical portion (2). A movable body (8) having a piston (10) provided at the tip of a freely positioned cylinder rod (9) and an action rod (11) extended at the tip of the piston (10) A working cylinder in which the working rod (11) cannot be slipped out and is assembled so that it can move forward and backward, and a second magnet (18) is installed in the distal end portion, and which is arranged in the guide passage (5) so that it can move forward and backward. (17) and a puncture needle (30) arranged near the tip of the action cylinder (17)
And a predetermined forward position of the action cylinder (17), the action cylinder (17) rapidly advances by a mutual magnetic force between the first magnet (6) and the second magnet (18). A blood-collecting device drive device. 2. When the action cylinder (17) is in the retracted posture, the first magnet (6) is axially opposed to each other, and the second magnet (18) is axially opposed to each other, and The blood-collector drive device according to claim 1, wherein the first magnet (6) has the same polarity on the proximal end side as the second magnet (18) on the distal end side. 3. When the action cylinder (17) is in the retracted posture, the first magnet (6) and the tip end of the second magnet (18) are radially opposed to each other, and The blood-collector drive device according to claim 1, wherein the polarity of the one magnet (6) on the base end side is different from the polarity of the second magnet (18) on the tip end side. 4. The first magnet (6) and the second magnet (18) are directly opposed to each other in the radial direction in the retracted posture of the action cylinder (17), and the first magnet (6) ) The polarity on the proximal end side,
The drive unit for the blood collecting apparatus according to claim 1, wherein the second magnet (18) has the same polarity on the tip side. 5. The assembly cylinder (14), which is assembled in a posture extending to the base end of the casing (1) and has both ends open, projects from the base end of the assembly cylinder (14). The pressing body (15) is assembled so that it can be moved forward and backward in the posture, and the assembly cylinder (1
An elastic material (16) which repels in the axial direction is arranged between the pressing member (15) and the pressing member (15), and the base end of the cylinder rod (9) is attached to the pressing member (15). The driving device for the blood collecting device according to 2, 3, or 4. 6. The ring-shaped first magnet (6) is concentrically arranged in the guide passage (5).
4. The drive device for the blood collecting device according to 4 or 5. 7. A puncture needle (30) at the tip of the action cylinder (17).
The driving device for the blood collecting device according to claim 1, wherein the device is fixed. 8. A fitting tubular portion (3) is provided at the tip of the casing (1), and the tubular body (19) tightly fitted in the fitting tubular portion (3) is incapable of slipping out and moves forward and backward. The blood collection according to claim 1, 2, 3, 4, 5, or 6, further comprising: a puncture needle (30) which is freely accommodated and projects from the tip of the fitting cylinder part (3) by advancing the action cylinder (17). Drive device.