JPH0377740B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a reduced pressure generating device adapted to aspirate medical liquids such as blood, and to a vacuum generating device adapted to aspirate medical liquids such as blood. The present invention relates to a blood collection system combined with a blood collection device.

(Prior Art) Conventionally, a syringe has been used as a reduced pressure generator for a blood collection device that suctions and collects medical fluids such as blood and tissue exudate from joints and the like.

(Problems to be Solved by the Invention) However, when a syringe intended for injection is used for suction, the following inconveniences occur.

Even with a small syringe, it is difficult or impossible to pull up the inner barrel of the syringe with one hand to collect a predetermined amount of blood. Since the inner cylinder must be pulled up with one hand, the syringe must be held and pressed with the other hand, and the syringe needle must be held in a fixed position at the same time, blood suction is unstable and requires skill.

Because both hands are occupied with the syringe, blood must be drawn directly into the syringe.
Syringes are currently considered disposable to prevent infections such as AIDS and blood hepatitis, which not only causes economic problems but also causes waste of resources and environmental pollution.

When the inner barrel of the syringe reaches the specified position inside the outer barrel of the syringe and blood collection is finished, there is still some vacuum left, and when you loosen the suction, a sudden atmospheric pressure is applied to the blood, causing the blood to flow back under the skin. To prevent congestion and injury to the patient, it is necessary to strongly hold the inner barrel of the syringe against atmospheric pressure, which tends to pull it down, until the needle is withdrawn.

In order to solve the above-mentioned problems, the present inventor attempted to configure a syringe-type reduced pressure generator to generate reduced pressure by pushing down the inner cylinder instead of by pulling up the inner cylinder as in the past, and conducted many prototype studies. After that, reduced pressure can be generated with one hand, and when the syringe inner cylinder reaches the lower end of the syringe, the pressure is equalized from the reduced pressure generator to the injection needle at the same time.In combination with the reduced pressure generator, the injection needle and test A blood collection system using a blood collection device including a tube and a blood collection device has been completed.

Therefore, an object of the present invention is to be able to generate reduced pressure with one hand operation, and to safely stop the generation of reduced pressure.
An object of the present invention is to provide a reduced pressure generating device that can prevent problems caused by subcutaneous backflow of blood.

Another object of the present invention is to provide a blood collection system that allows the user to operate the injection needle and collect blood, etc. with the other hand that does not operate the reduced pressure generator.

Yet another object of the present invention is to provide an economical blood collection system that eliminates the need for disposable vacuum generators and blood collection devices.

(Means for Solving the Problems) In order to achieve the above object, the reduced pressure generating device of the present invention generates reduced pressure by pushing down a piston moving inside a cylindrical tube, and generates a reduced pressure for medical liquids such as blood. In the reduced pressure generating device suitable for suctioning, the rod 14 extends vertically through the center of the tube body 6b and its upper end closing portion 7b and is sufficiently longer than the length of the tube body 6b, and its lower end. is fixed to the
and a piston 15 that fits into the inner wall of the tube and is slidable.
and the rod 1 is fixed to the upper end of the rod 14.
Knob 5 adapted to push down 4 with a finger
and protrudes in the radial direction from the upper end closing portion 7b,
Ear body 8 adapted to hold tube body 6b with one hand
and a suction conduit 46 which is fixed in the longitudinal direction along the outer wall of the tube body 6b, whose upper end is fixed and closed to the upper end closing portion 7b, and whose lower end protrudes from the lower end closing portion 3b of the tube body 6b. , a suction orifice 10 provided at the lower end of the suction pipe 46, and a suction orifice 10 provided at the upper end of the suction pipe 46 adjacent to the lower surface of the upper end closing portion 7b and penetrating the side wall of the pipe 6b. Radial opening 47 communicating with the inside of the tube body 6b
an exhaust passage 13 extending longitudinally through the center of the rod 14; an opening 17 located at the lower end of the exhaust passage 13 on the lower surface of the piston 15; It is characterized by comprising a radial opening 16 that is adjacent to the lower surface of the upper end closing portion 7b and communicates the inside of the tube body 6b with the upper end of the passage 13 when the closing portion 3b is reached.

The blood collection device 40 combined with this reduced pressure generator 1 is made of a slightly elongated solid plastic molded body, and has a convex mounting portion at one end into which an ordinary injection needle 49 and the injection needle 49 can be removably fitted. 49a, and a test tube concave attachment part 52a that is disposed at the base of the convex attachment part 49a and allows the test tube 52 to be attached to the blood collection device 40 by removably fitting the injection needle 49 at a predetermined angle; A concave attachment part 48 of the suction orifice 10 of the reduced pressure generator, which is disposed at the end opposite to the injection needle 49, and a convex attachment part 49a and a test tube concave attachment part 52a, which are disposed inside the blood collection device 40.
and a passageway 50 that communicates with the concave mounting portion 48, respectively.

(Operation) The operation of the blood collection system according to the present invention will be explained with reference to FIG. The reduced pressure generator 1 is connected to the blood collection device 4 using a synthetic rubber tube 41 and an adapter 42.
0, grasp the tube body 6b of the reduced pressure generator 1 at the lower part of the ear body 8 with one hand, push down the knob 5, and position the piston 15 at the position required for the amount of blood to be collected. Grasp the blood collection device 40 with one hand, insert the injection needle 49 into the patient's arm blood vessel in the usual manner, hold the lower end of the test tube 52 of the blood collection device 40 on the patient's arm, and collect blood with one hand. While holding the device 40 firmly, hold the knob 5 with the thumb of the other hand and the barrel between the fingers of the other hand, and gradually push down the thumb to apply reduced pressure to the injection needle 49 to ensure that the blood is drawn correctly. After confirming that the injection needle 49 is correctly positioned in the blood vessel, the piston 15 is moved to the lower end closed portion 3b of the tube body 6b by pressing down on the knob 5 with the thumb.
reach. Meanwhile, the collected blood flow is in test tube 5.
Continue to gently press down on knob 5 while making sure that the flow continues into step 2. The knob 5 is the lower end closing part 3b
At the same time, the openings 16, 17, and 47 of the suction chamber 2' and the exhaust chamber 2'' communicate with each other, and the pressures of the suction chamber 2' and the exhaust chamber 2'' are equalized.

Therefore, in the subsequent operation of the blood collection device 40, the injection needle 49 can be pulled out from the patient's arm without fear of blood leaking under the patient's skin. Blood collection device 4
0 from the adapter 42, another blood collection device is attached to the adapter 42, and the next blood collection is started. The previous blood collection device 40 was made disposable by removing the test tube 52 and sending it for blood testing, and removing only the injection needle 49 and discarding it in a prescribed manner. Since they are formed so that any of them can be combined with each other, they can be washed and sterilized by heating afterwards, and can be immediately reused without the need for a combination search operation. Therefore, in the blood collection system of the present invention, only the injection needle needs to be disposable.

(Example) The features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings.

In FIG. 1, the reduced pressure generator 1 includes a pipe body 6b
an outer cylindrical portion 2b having an upper end closing portion 7b and a lower end closing portion 3b; a rod 14 that extends vertically through the center of the upper end closing portion 7b in an airtight manner and is sufficiently longer than the length of the tube body 6b; A piston-rod device 4 comprising a piston 15 fixed to the lower end of the rod 14 and slidable by fitting into the inner wall of the tube body 6b.
It consists of.

The reduced pressure generator 1 further includes a knob 5 fixed to the upper end of the rod 14 and adapted to push the rod 14 downward with a finger, for example, a disc-shaped knob 5 protruding radially from the upper end closure part 7b; an ear body 8 adapted to hold the tube body 6b with one hand, e.g. projecting in the form of a ring or projecting in two directions, and an upper end fixed longitudinally along the outer wall of the tube body 6b; The lower end portion is fixed to and closed by the upper end closing portion 7b, and the lower end portion is fixed to the lower end closing portion 3b of the tube body 6b.
a suction conduit 46 protruding from the suction conduit 46;
A suction orifice 10 provided at the lower end and a suction orifice 10 provided at the upper end of the suction pipe 46 adjacent to the lower surface of the upper end closing portion 7b and penetrating the side wall of the pipe 6b connect the suction pipe 46 and the inside of the pipe 6b. a radial opening 47 communicating with the rod 14, an exhaust passage 13 extending longitudinally through the center of the rod 14, an opening 17 located on the lower surface of the piston 15 at the lower end of the exhaust passage 13, and the piston 15 being pushed down. and a radial opening 16 that is adjacent to the lower surface of the upper end closing portion 7b and communicates the inside of the tube 6b with the upper end of the passage 13 when the lower end closing portion 3b of the tube 6b is reached. Ru. When the piston 15 is moved from the upper end closure part 7b to the lower end closure part 3b, a variable capacity suction chamber 2' communicating with the suction line 46 is created between the upper end closure part 7b and the piston 15 and the lower end closure part 3b. A variable volume exhaust chamber 2'' communicating with the exhaust passage 13 is defined between the two.

In FIG. 2, a sectional view taken along the line 2-2 in FIG. It may also be configured by being bonded to the tubular body 6b with an adhesive.

In FIG. 3, a sectional view is shown of a blood collection device 40 in combination with the vacuum generating device 1, which is constructed as a slightly elongated solid body made of a molded plastic body, for example made of polypropylene, and which is similar to an ordinary syringe needle. 49, a convex mounting part 49a that removably fits into the injection needle 49 similar to a conventional syringe, and an expandable hole structure in the slightly thin outer wall part that removably fits a test tube 52 for blood collection. Test tube recess attachment part 52
a, the injection needle 49 and the test tube 52 are formed so that they can be commonly fitted into any blood collection device 40,
The attachment is arranged at a predetermined angle such that the tip of the injection needle 49 and the lower end of the test tube 52 are directed by the patient's skin during use, as shown in FIG. The angle is usually around 110 degrees or more.

The blood collecting device 40 further includes a concave mounting portion 48 of the hole structure of the suction orifice 10 of the reduced pressure generating device 1, which is disposed at a position facing the injection needle 49, and a concave mounting portion 48 of the hole structure of the suction orifice 10 of the reduced pressure generating device 1, which is disposed in a position facing the injection needle 49, and a syringe needle which is disposed inside the blood collecting device 40. 49, a passage 50 that communicates the convex attachment part 49a, the test tube concave attachment part 52a, and the concave attachment part 48, respectively.
Among them, the passage portion that communicates the test tube concave attachment portion 52a and the concave attachment portion 48 is the convex attachment portion 49 of the injection needle 49.
a, located above the concave attachment portion 52a of the test tube 52 with respect to the level connecting the convex attachment portion 49a of the injection needle 49 and the concave attachment portion 48 in a plane including the test tube concave attachment portion 52a and the concave attachment port 48; A bent portion 51 is provided to prevent blood from exceeding the test tube 52 and reaching the concave attachment portion 48.

In FIG. 4, a blood collection system in which a reduced pressure generator 1 and a blood collection device 40 are combined is shown in use, and in this blood collection system, the suction orifice 10 of the reduced pressure generator 1 is made of a flexible synthetic rubber tube. 41 and adapter 42 to attach the recessed mounting portion 48 of the blood collection device 40 (see FIG. 3).
is combined with One end of the adapter 42 is configured to fit into the recessed mounting portion 48 . It is preferable to use the flexible synthetic rubber tube 41 because it prevents the vibration of the reduced pressure generating device 1 from being transmitted to the blood collection device 40. Alternatively, the suction orifice 10 itself may be configured to fit into the recessed mounting portion 48, and the reduced pressure generating device 1 and the blood collecting device 40 may be directly connected.

(Effects of the Invention) According to the present invention, unlike the conventional suction collection of blood and exudate that generates reduced pressure using a syringe with both hands, reduced pressure for blood collection can be generated by pushing down the piston with one hand. In addition, it is possible to safely and easily stop the generation of reduced pressure at any time, which prevents the problem of subcutaneous backflow of blood when the injection needle is withdrawn, and allows the user to operate the injection needle and collect blood with the other hand that is not operating the reduced pressure generator. The reduced pressure generator and the blood collection device do not have to be disposable, environmental pollution and resource waste are reduced, and an economical blood collection system can be provided.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the reduced pressure generator according to the present invention, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. FIG. 4 is a sectional view of a combined blood collection device according to the present invention, and FIG. 4 is an explanatory diagram showing the actual use of a blood collection system in which the reduced pressure generator of FIG. 1 and the blood collection device of FIG. 2 are combined. It is. 1...Reduced pressure generator, 2b...Outer cylinder part, 2'...
…Suction chamber, 2″…Exhaust chamber, 3b…
...Lower end closing part, 4...Piston-rod device, 5
...knob, 6b ... pipe body, 7b ... upper end closing part,
8... Ear body, 10... Suction orifice, 13...
Exhaust passage, 14 rod, 15... Piston, 16
...opening, 17...opening, 40...blood collection device, 41...synthetic rubber tube, 42...adapter, 46...suction pipe line, 47...opening, 48...
Concave attachment part, 49... injection needle, 49a... convex attachment part, 50... passage, 51... bending part, 52... test tube, 52a... test tube concave attachment part.

Claims (1)

[Scope of Claims] 1. A reduced pressure generating device that generates reduced pressure by pushing down a piston moving inside a cylindrical tube and is suitable for aspirating medical liquids such as blood,
A rod 14 that extends vertically through the center of the tube body 6b and its upper end closing portion 7b and is sufficiently longer than the length of the tube body 6b, and is fixed to the lower end portion and fitted into the inner wall of the tube body. and a piston 15 that can freely slide.
a knob 5 fixed to the upper end of said rod 14 and adapted to push the rod 14 downward with a finger;
an ear body 8 protruding radially from the upper end closure part 7b and adapted to hold the tube body 6b with one hand;
a suction conduit 46 which is fixed in the longitudinal direction along the outer wall of the tube body 6b, has an upper end fixed to the upper end closing portion 7b and is closed, and has a lower end protruding from the lower end closing portion 3b of the tube body 6b; A suction orifice 10 provided at the lower end of the suction conduit 46, and a suction orifice 10 provided at the upper end of the suction conduit 46 adjacent to the lower surface of the upper end closing portion 7b and penetrating the side wall of the tube body 6b. a radial opening 47 that communicates with the inside of 6b;
An exhaust passage 13 extends longitudinally through the center of the rod 14, and a piston 1 is provided at the lower end of the exhaust passage 13.
5 and an opening 17 located on the lower surface of the piston 1.
5 is pushed down and the lower end closed portion 3 of the tube body 6b
A reduced pressure generating device comprising a radial opening 16 that is adjacent to the lower surface of the upper end closing portion 7b and communicates the inside of the tube body 6b with the upper end of the passage 13 when the pressure reaches the upper end of the upper end closing portion 7b. 2. The reduced pressure generating device according to claim 1, wherein the suction pipe line 46 and the pipe body 6b are integrally constructed. 3. The reduced pressure generating device according to claim 1 or 2, in which the rod 14 and the piston 15 are integrated. 4. In a blood collection system consisting of a combination of a reduced pressure generator 1 and a blood collection device 40, which are suitable for suctioning and collecting medical liquids such as blood, the reduced pressure generator is located at the center of the tube body 6b and its upper end closing portion 7b. a rod 14 that extends vertically through the tube body 6b in an airtight manner and is sufficiently longer than the length of the tube body 6b; a piston 15 fixed to the lower end portion of the rod 14 and slidably fitted on the inner wall of the tube body; a knob 5 fixed to the upper end and adapted to press down the rod 14 with a finger; and an ear body 8 projecting radially from said upper end closure 7b and adapted to hold the tube body 6b with one hand. is fixed in the longitudinal direction along the outer wall of the tube body 6b, the upper end portion is fixed and closed to the upper end closing portion 7b, and the lower end portion is fixed to the lower end closing portion 3b of the tube body 6b.
a suction conduit 46 protruding from the suction conduit 46;
A suction orifice 10 provided at the lower end and a suction orifice 10 provided at the upper end of the suction pipe 46 adjacent to the lower surface of the upper end closing portion 7b and penetrating the side wall of the pipe 6b connect the suction pipe 46 and the inside of the pipe 6b. a radial opening 47 communicating with the rod 14, an exhaust passage 13 extending longitudinally through the center of the rod 14, an opening 17 located on the lower surface of the piston 15 at the lower end of the exhaust passage 13, and the piston 15 being pushed down. a radial opening 16 adjacent to the lower surface of the upper end closing portion 7b and communicating the inside of the tube 6b with the upper end of the passage 13 when the blood reaches the lower end closing portion 3b of the tube 6b; The collection device 40 consists of a slightly elongated solid plastic molded body with a conventional injection needle 49 at one end.
and a convex attachment part 49a into which the injection needle 49 can be removably fitted;
9, a test tube concave attachment portion 52a that can be detachably fitted to the test tube at a predetermined angle, and a concave attachment portion 48 of the suction orifice 10 of the reduced pressure generator disposed at the end opposite to the injection needle 49; , A blood collection system comprising a passage 50 disposed inside the blood collection device 40 and communicating the convex mounting part 49a, the test tube concave mounting part 52a, and the concave mounting part 48, respectively. 5. The blood collection system according to claim 4, wherein the angle between the injection needle 49 and the test tube 52 is 110 degrees or more. 6. The blood collection system according to claim 4 or 5, wherein the recessed mounting portion 48 has a hole structure that can fit into the suction orifice 10. 7 The suction orifice 10 and the concave mounting portion 48
7. The blood collection system according to claim 4, wherein the blood collection system is connected via a flexible plastic tube 41 and an adapter 42 that fits into the recessed mounting portion 48. 8. In the passage 50, the passage portion that communicates the test tube concave attachment portion 52a and the concave attachment portion 48 is within a plane that includes the convex attachment portion 49a of the injection needle 49, the test tube concave attachment portion 52a, and the concave attachment portion 48, Claims 4 to 7 include a bending part 52 arranged and bent above the test tube concave attachment part 52a with respect to the level connecting the convex attachment part 49a and the concave attachment part 48. Blood collection system.