JP2014068800A - Infusion needle, infusion needle unit, infusion device and, needle slip-out detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infusion needle, an infusion needle unit, an infusion device, and a needle slip-out detection system capable of reliably detecting that a needle tip slips out of a blood vessel in a simple configuration.SOLUTION: An infusion needle 2 includes an infusion needle body having a tubular-shaped needle tube part 3 the tip of which is opened, and a storage part that can hold a thermistor probe 4 such that, when being inserted inside the needle tube part 3, a space through which liquid can pass is formed between itself and the inner face of the needle tube part 3. The storage part holds a thermistor part 20 provided at the distal end of the thermistor probe 4 in such a manner as protruding it from the tip of the needle tube part 3.

Description

  The present invention relates to an infusion needle, an infusion needle unit, an infusion device, and a needle drop detection system that punctures a patient's blood vessel and injects a drug solution or the like.

  As a method for injecting a drug solution into a patient's blood vessel, a method in which a catheter or an indwelling needle is placed in the blood vessel and the drug solution is injected from the tip is used. For example, in chemotherapy using an anticancer drug as a type of cancer treatment, a catheter or an indwelling needle is placed in a vein, and the anticancer drug (or a drug solution diluted with the anticancer drug) is placed in the blood vessel. It is administered (injected).

  However, some chemical solutions such as anticancer drugs damage not only cancer cells but also normal cells. When such a drug solution is administered, if the indwelling needle or the like is mistakenly removed from the blood vessel, the drug solution leaks into the body tissue outside the blood vessel. There was a risk of damage. Therefore, various methods for detecting that the indwelling needle has moved out of the blood vessel have been proposed. For example, a noise sound is generated from the tip of the indwelling needle, and the presence or absence of the noise sound is detected by a receiving unit attached in the vicinity of the skin punctured with the indwelling needle to determine that the indwelling needle has come out of the blood vessel. A configuration has been proposed (see, for example, Patent Document 1). In addition, a magnetic part was provided near the tip of the indwelling needle, and a change in the magnetic flux density of the magnetic part was detected by a magnetic sensor attached near the skin where the indwelling needle was punctured. The structure which judges this is proposed (for example, refer patent document 2).

JP 2011-200909 A JP 2011-200430 A

  By the way, in the configuration described in Patent Document 1 or Patent Document 2 described above, since the receiving unit and the like are required in addition to the indwelling needle, the configuration is complicated. In addition, when injecting a drug solution into a blood vessel, it is necessary to stick the receiving unit or the like to the skin after puncturing the indwelling needle, which complicates the work. Furthermore, if the attaching position of the receiving unit or the like is shifted, noise sound or the like cannot be received accurately, and it may not be possible to detect that the indwelling needle has come out of the blood vessel.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an infusion needle, an infusion needle unit, an infusion device, and a needle that can reliably detect that the needle tip has come out of the blood vessel with a simple configuration. It is intended to provide a missing detection system.

The present invention has been proposed in order to achieve the above-mentioned object, and in accordance with the present invention, an infusion needle main body having a tubular needle tube portion whose tip is opened,
An infusion needle comprising: a storage portion capable of holding the wire so as to form a space through which the liquid can pass between the inner surface of the needle tube portion when the wire is inserted inside the needle tube portion. And
The storage portion is an infusion needle characterized in that a temperature sensor portion provided at a distal end portion of the wire rod is held protruding from the distal end of the needle tube portion.

  The infusion solution according to claim 1, wherein the storage portion includes a movement restricting portion that abuts a part of the wire and restricts movement toward the distal end side. It is a needle.

What is described in claim 3 is an infusion needle according to claim 1 or claim 2,
A wire rod that is movable between a storage position in which the temperature sensor unit is stored inside the tip of the needle tube unit and a protruding position in which the temperature sensor unit is protruded from the tip of the needle tube unit. It is the infusion needle unit characterized.

According to a fourth aspect of the present invention, the wire includes a slide base at a position away from the temperature sensor unit,
The needle base part which supports the said slide base part in the state which can be moved toward the front end side from the rear end side of the said infusion needle to the rear end side of the said needle tube part is provided. It is an infusion needle unit.

  According to a fifth aspect of the present invention, in the infusion needle unit according to the fourth aspect, the needle base portion includes a movement guide portion that guides the slide base portion along the movement direction.

  According to a sixth aspect of the present invention, in the infusion needle unit according to the fourth or fifth aspect, the slide base portion includes a moving operation portion that protrudes outward from the slide base portion. is there.

According to a seventh aspect of the present invention, one of the needle base or the slide base includes a locked portion, and the other includes a locking portion capable of locking the locked portion.
The locking portion includes a storage locking portion that locks the locked portion in the storage position of the wire, and a protruding locking portion that locks the locked portion in the protruding position of the wire. It is an infusion needle unit as described in any one of Claims 4-6 characterized by the above-mentioned.

What is described in claim 8 is an infusion needle according to claim 1 or claim 2,
A wire rod that is movable between a storage position in which the temperature sensor unit is stored inside from the tip of the needle tube unit and a protruding position in which the temperature sensor unit is protruded from the tip of the needle tube unit;
A temperature detecting means for detecting a temperature change based on temperature information detected by the temperature sensor portion protruding from the tip of the needle tube portion in a state where the tip of the needle tube portion is punctured into the body and liquid is injected; An infusion device characterized by comprising:

What is described in claim 9 is an infusion needle unit according to any one of claims 3 to 7,
A temperature detecting means for detecting a temperature change based on temperature information detected by the temperature sensor portion protruding from the tip of the needle tube portion in a state where the tip of the needle tube portion is punctured into the body and liquid is injected; An infusion device characterized by comprising:

According to a tenth aspect of the present invention, there is provided an infusion needle position determining means for determining whether or not a tip of the needle tube portion is positioned in a blood vessel based on temperature information detected by the temperature sensor unit.
Informing means for informing when the tip of the needle tube part is not located in the blood vessel;
The infusion device according to claim 8 or 9, wherein the infusion device is provided.

A signal transmitting means for transmitting a signal when the infusion needle position determining means determines that the tip of the needle tube portion is not located in a blood vessel,
Signal receiving means for receiving a signal sent from the signal transmitting means,
The infusion device according to claim 10, wherein the notifying means notifies based on a signal received by the signal receiving means.

What is described in claim 12 is a needle drop detection system for an infusion needle having a tubular needle tube portion having an open tip.
In a state where the tip of the needle tube part is punctured into the body and liquid is injected, a temperature sensor part that protrudes from the tip of the needle tube part and measures the temperature,
Based on the temperature information detected by the temperature sensor unit, an infusion needle position determination unit that determines whether or not the tip of the needle tube unit is located in the blood vessel,
Informing means for informing when the tip of the needle tube part is not located in the blood vessel;
A needle omission detection system characterized by comprising:

According to a thirteenth aspect of the present invention, there is provided a signal transmitting means for transmitting a signal when the infusion needle position determining means determines that the tip of the needle tube portion is not located in the blood vessel,
Signal receiving means for receiving a signal sent from the signal transmitting means,
13. The needle dropout detection system according to claim 12, wherein the notification unit notifies based on a signal received by the signal reception unit.

According to the present invention, the following excellent effects can be obtained.
According to the first aspect of the present invention, since the temperature sensor portion is protruded and held from the tip of the needle tube portion, the infusion needle is detached from the blood vessel by detecting a change in temperature measured by the temperature sensor portion. Can be detected reliably. Further, it is not necessary to separately provide a configuration such as a receiving unit outside the infusion needle unit, and the configuration can be simplified. Thereby, the manufacturing cost can be reduced.

  According to the second aspect of the present invention, since the storage portion includes the movement restricting portion that abuts against a part of the wire and restricts the movement toward the distal end side, the temperature sensor portion can be easily positioned. it can. Further, it is possible to prevent the temperature sensor portion from protruding too far from the tip of the needle tube portion, and it is possible to suppress inconvenience that the inner wall of the blood vessel is damaged.

  According to the third aspect of the present invention, the temperature sensor unit is movable between a storage position in which the temperature sensor unit is stored from the tip of the needle tube unit and a protruding position in which the temperature sensor unit is protruded from the tip of the needle tube unit. Since the wire rod is provided, maintaining the temperature sensor portion in the storage position at the time of puncturing the infusion needle unit can prevent the puncture of the blood vessel from being inhibited by the temperature sensor portion, and puncture can be performed smoothly. Further, if the temperature sensor part is projected from the tip of the needle tube part while the infusion needle unit is placed in the blood vessel, the temperature can be detected more accurately. Furthermore, even if the position of the infusion needle unit is inadvertently shifted in this state, the temperature sensor portion contacts the inner wall of the blood vessel before the tip of the needle tube portion, so that the inconvenience that the inner wall of the blood vessel is damaged can be suppressed.

  According to the fourth aspect of the invention, the wire includes the slide base at a position deviated from the temperature sensor portion, and the slide base is directed from the rear end side to the front end side of the infusion needle at the rear end side of the needle tube portion. Therefore, the temperature sensor unit can be moved smoothly.

  According to the fifth aspect of the present invention, since the needle base portion includes the movement guide portion that guides the slide base portion along the movement direction, the temperature sensor portion can be moved more smoothly.

  According to the sixth aspect of the present invention, the slide base includes the moving operation unit that protrudes outward from the slide base, so that the temperature sensor can be moved more smoothly.

  According to the invention described in claim 7, one of the needle base and the slide base is provided with a locked portion, and the other is provided with a locking portion capable of locking the locked portion, Since the wire rod is composed of a storage locking portion that locks the locked portion in the storage position, and a protrusion locking portion that locks the locked portion in the protruding position, the protruding position and the storage position It is possible to sufficiently position the temperature sensor portion in. Therefore, the temperature sensor unit can be moved smoothly. Moreover, it can suppress that the positioned temperature sensor part shifts carelessly. As a result, when the infusion needle unit is punctured into the blood vessel, the temperature sensor part protrudes from the tip of the needle tube part, or the temperature sensor part is placed at the tip of the needle tube part while the infusion needle unit is placed in the blood vessel. The inconvenience of being stored can be eliminated.

  According to the eighth aspect of the present invention, the temperature sensor portion is detected by projecting from the tip of the needle tube portion in a state where the infusion needle, the wire, and the tip of the needle tube portion are punctured into the body to inject liquid. Temperature detecting means for detecting a temperature change based on the temperature information, it is possible to reliably detect that the infusion needle has detached from the blood vessel.

  According to the ninth aspect of the present invention, the temperature information detected by the temperature sensor projecting from the tip of the needle tube part in a state where the infusion needle unit and the tip of the needle tube part are punctured into the body to inject liquid. And a temperature detecting means for detecting a temperature change based on the above, so that it is possible to reliably detect that the infusion needle is detached from the blood vessel.

  According to the invention described in claim 10, based on the temperature information detected by the temperature sensor unit, an infusion needle position determination unit that determines whether or not the tip of the needle tube unit is located in the blood vessel, and the needle tube unit An informing means for informing when the tip is not located in the blood vessel, it is possible to more easily detect that the infusion needle has come off the blood vessel.

  According to the eleventh aspect of the present invention, when the infusion needle position determining means determines that the tip of the needle tube portion is not located in the blood vessel, the signal transmitting means transmits a signal, and is sent from the signal transmitting means. Signal receiving means for receiving the received signal, and the notifying means notifies based on the signal received by the signal receiving means, so that it is notified to a place away from the patient who has punctured the infusion needle unit, such as a nurse station Means can be installed, and even when the patient is away from the patient, it can be detected that the infusion needle has detached from the blood vessel.

  According to the twelfth aspect of the present invention, there is provided an infusion needle removal system for a transfusion needle having a tubular needle tube portion with an open tip, in a state where the tip of the needle tube portion is punctured into the body and liquid is injected. A temperature sensor unit that measures the temperature by projecting from the tip of the needle tube unit, and an infusion needle position determination that determines whether or not the tip of the needle tube unit is located in the blood vessel based on temperature information detected by the temperature sensor unit And means for notifying when the tip of the needle tube portion is not located in the blood vessel, it is possible to easily detect that the infusion needle has come off the blood vessel.

  According to the thirteenth aspect of the present invention, when the infusion needle position determining means determines that the tip of the needle tube portion is not located in the blood vessel, the signal transmitting means transmits a signal, and is sent from the signal transmitting means. Signal receiving means for receiving the received signal, and the notifying means notifies based on the signal received by the signal receiving means, so that it is notified to a place away from the patient who has punctured the infusion needle unit, such as a nurse station Means can be installed, and even when the patient is away from the patient, it can be detected that the infusion needle has detached from the blood vessel.

It is an external view of an infusion needle unit. It is sectional drawing of an infusion needle unit, (a) is sectional drawing when a thermistor probe exists in a storage position, (b) is sectional drawing when a thermistor probe exists in a protrusion position. It is explanatory drawing of the needlepoint of an infusion needle unit, (a) is sectional drawing when a thermistor probe exists in a storage position, (b) is sectional drawing when a thermistor probe exists in a protrusion position. It is a schematic diagram explaining the state by which the front-end | tip of the infusion needle unit was detained in the blood vessel. It is principal part explanatory drawing of the infusion needle unit provided with the movement guide part, (a) is an external view, (b) is sectional drawing. It is principal part explanatory drawing of the infusion needle unit provided with the biasing member which biases a slide base. It is explanatory drawing of the infusion needle unit in other embodiment, (a) is a schematic diagram explaining the state by which the infusion needle was detained in the blood vessel, (b) demonstrates the state by which the thermistor probe was inserted in the infusion needle. It is a schematic diagram.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the infusion needle unit 1 is inserted between the infusion needle 2 having a tubular needle tube portion 3 having an open tip and the inner surface of the needle tube portion 3, and between the inner surface of the needle tube portion 3. And a thermistor probe 4 (corresponding to a wire in the present invention) that forms a space through which liquid can pass. Specifically, the infusion needle 2 includes a tubular needle tube portion 3, a puncture portion 3 a with a sharpened tip of the needle tube portion 3, and a needle base portion 7 connected to the rear end side of the needle tube portion 3. It is configured. The needle tube portion 3 is formed of an elongated metal tube, and includes a needle tube channel 5 through which a chemical solution (a kind of liquid) can pass. One end of the needle tube channel 5 is open to the puncture portion 3a, and can communicate with the blood vessel 32 in a state where the puncture portion 3a of the infusion needle 2 is punctured into the blood vessel 32 of the patient. The other end of the needle tube channel 5 is connected to a tube 27 (see FIGS. 1 and 4) for introducing a chemical solution through a communication channel 16 of the needle base 7 described later. A probe portion 19 that is a main body of the thermistor probe 4 is inserted into the needle tube channel 5. The inner diameter of the needle tube channel 5 is set to be larger than the diameter of the probe part 19 to be inserted, and the drug solution can pass through the space between the inner wall of the needle tube channel 5 and the probe part 19. For example, when the outer diameter of the probe portion 19 is 0.25 mm, the needle tube portion 3 is 23G (gauge) (the outer diameter of the needle tube portion 3 is 0.63 mm, and the inner diameter (the inner diameter of the needle tube flow path 5) is 0. .33 mm) or 22G (the outer diameter of the needle tube portion 3 is 0.71 mm and the inner diameter (the inner diameter of the needle tube channel 5) is 0.41 mm). In the present embodiment, the probe portion 19 is inserted in the center of the needle tube flow path 5, and the space between the inner wall of the needle tube flow path 5 and the probe portion 19 is formed in a cylindrical shape.

  The needle base portion 7 is a substantially y-shaped plastic member formed by integrally molding a base body 8 that is coaxially with the needle tube portion 3 and a branch portion 9 branched from the base body 8. The base body 8 has a cylindrical shape that is coaxially positioned with the needle tube portion 3, and is connected to the rear end portion (the end portion on the opposite side of the puncture portion 3a) of the needle tube portion 3. Specifically, the base body 8 and the needle tube portion 3 are connected so that the rear end of the needle tube portion 3 is located on the front end side of the communication channel 16 of the branch portion 9 on the central axis of the base body 8. Yes. A cylindrical communication space 11 that is located coaxially with the needle tube flow path 5 and communicates with the needle tube flow path 5 is formed on the rear end side of the portion of the base body 8 to which the needle tube section 3 is connected. . The communication space 11 of the present embodiment is set to be substantially the same as the inner diameter of the needle tube channel 5. Further, one end of the communication channel 16 communicates with the side of the communication space 11, so that the chemical solution from the tube 27 can flow into the needle tube channel 5 via the communication channel 16 and the communication space 11. Yes.

  The base main body 8 in the present embodiment is located on the rear end side, and has a base end 8b in which a slide base 21 to be described later is accommodated having a diameter larger than that of the front end 8a to which the needle tube portion 3 of the base main body 8 is connected. Formed. A base housing space 12 that is slightly larger than the slide base 21 is formed in the base end 8b of the base main body 8 in a state of being opened to the rear end. A connecting space 13 is formed between the base storage space 12 and the communication space 11, with the front end communicating with the rear end of the communication space 11 and the rear end communicating with the front end of the base storage space 12. . The connection space 13 of the present embodiment is formed so as to be smaller than the inner diameter of the base storage space portion 12 and larger than the inner diameter of the communication space 11. The connection space 13 is filled with a seal member 14 made of silicon rubber or the like so as to close the rear end of the communication space 11 in a liquid-tight state. The seal member 14 is coaxially connected to the needle tube flow path 5 and penetrates the seal through hole 15 with a diameter slightly smaller than that of the probe portion 19 of the thermistor probe 4, and the seal member 14 (specifically, the inner peripheral surface of the seal through hole 15). ) In a liquid-tight and slidable state on the outer peripheral surface of the probe portion 19. The needle tube portion 3 and the distal end portion 8a correspond to the infusion needle main body of the present invention, and the proximal end portion 8b corresponds to the storage portion of the present invention.

  The branch portion 9 has a cylindrical shape that branches off from the side surface of the distal end portion 8a of the base body 8 and protrudes toward the side of the base end portion 8b of the base body 8. A communication flow path 16 branched from the communication space 11 is formed along the axial direction of the branch portion 9. In addition, the tube connection space 16a located on the protruding end side of the branching portion 9 in the communication flow path 16 has a diameter larger than that of the distal end flow path 16b located on the base body 8 side, and is opened outward from the protruding end. ing. The tube connection space 16a has a taper that gradually increases in diameter toward the opening, and constitutes a luer taper structure in which a luer (not shown) provided at the tip of the tube 27 is fitted and connected. Further, a branch-side male screw portion into which a lock ring (not shown) attached to the end portion of the tube 27 can be screwed at a position located on the opening side of the tube connection space 16a in the outer periphery of the branch portion 9. 17 is formed. When the end of the tube 27 is fitted into the tube connection space 16a and the lock ring is screwed into the branch-side male screw portion 17, the tube 27 and the branch portion 9 are brought into close contact with each other in a liquid-tight state. The space and the communication channel 16 are configured to communicate with each other.

  The thermistor probe 4 includes a metal probe portion 19 configured in an elongated bar shape, a thermistor portion 20 (corresponding to a temperature sensor portion in the present invention) for measuring a temperature provided at a tip portion of the probe portion 19, A slide base 21 is provided at a position deviated from the thermistor 20 (in the present embodiment, the end opposite to the thermistor 20). The thermistor probe 4 in the present embodiment is set to have substantially the same length as the infusion needle 2, and the thermistor 20 is punctured at the position where the slide base 21 is moved rearward (storage position, see FIG. 2A). The thermistor portion 20 is configured to protrude (expose) from the puncture portion 3a at a position where it is housed inside the portion 3a and the slide base 21 is moved forward (a protruding position, see FIG. 2B). . The thermistor unit 20 is an element whose electric resistance changes in response to a temperature change, and temperature information can be obtained by measuring the electric resistance. The probe unit 19 is coated with an insulator around the periphery thereof, and the temperature information measured by the thermistor unit 20 is transmitted as an electrical signal to the conductive wire 24 connected to the end opposite to the thermistor unit 20. .

  The slide base portion 21 is a plastic cylindrical member positioned coaxially with the probe portion 19, and is accommodated in the base end portion 8b. The base end portion 8b directs the infusion needle 2 from the rear end side toward the front end side. It is supported in a movable state. The rear end portion of the probe portion 19 is connected to the distal end side (thermistor portion 20 side) of the slide base portion 21. In addition, inside the slide base portion 21, a lead wire connection hollow portion 22 is formed in a state opened to the rear end side. Then, the rear end of the probe portion 19 is exposed at the front end of the lead wire connection hollow portion 22, and one end of the lead wire 24 is connected to the rear end of the probe portion 19. Furthermore, the flange part 23 which protruded toward the outward is formed in the location located in the open port side of the conducting wire connection hollow part 22 among the outer periphery of the slide base part 21. As shown in FIG. Thereby, in the projecting position where the slide base 21 has moved forward, the flange portion 23 (corresponding to the movement restricting portion in the present invention) abuts the rear end of the base end portion 8b (the opening edge of the base storage space portion 12), It is possible to restrict the slide base 21 from moving further forward. In addition, the front end surface of the slide base can be used as a movement restricting portion, and the forward movement can be restricted by contacting the inner surface of the base accommodating space of the infusion needle. In short, it is only necessary to provide a movement restricting portion that is in contact with a part of the infusion needle and is restricted from moving toward the distal end side at a position away from the thermistor portion of the thermistor probe.

  Next, an infusion device 25 and a needle drop detection system using the above-described infusion needle unit 1 will be described. As shown in FIG. 4, the infusion device 25 of the present embodiment includes the infusion needle unit 1, the medicinal solution bag 26, the tube 27, the clamp 34, and the control unit 28 (temperature detection means and infusion needle position determination means in the present invention). Equivalent), a temperature monitor 29 (a kind of display means), and a notification lamp 30 (corresponding to the notification means in the present invention), and the thermistor section 20 in a state where the puncture section 3a is punctured into the body and a medical solution is injected. Protrudes from the puncture portion 3a and detects temperature information. The drug solution bag 26 is a container for storing a drug solution such as an anticancer drug. The tube 27 has flexibility, one end is connected to the branch portion 9 of the infusion needle 2 and the other end is connected to the drug solution bag 26. Thereby, the chemical solution in the chemical solution bag 26 can be introduced into the blood vessel 32 through the tube 27, the communication channel 16, the communication space 11, and the needle tube channel 5. In addition, a drip tube 31 is provided in the middle of the tube 27 so that the flow of the chemical solution can be visually confirmed. Further, a clamp 34 is provided on the downstream side of the drip tube 31. The clamp 34 can adjust the flow rate of the chemical solution by pressing the tube 27 manually or by a signal from the control unit 28, or can stop the flow of the chemical solution.

  The control unit 28 is connected to the other end of the conducting wire 24, receives temperature information detected by the thermistor unit 20, and functions as a temperature detection unit that detects a temperature change based on the temperature information. It functions as a control means for controlling the drive of the monitor 29 and the notification lamp 30. Further, the control unit 28 determines whether or not the puncture unit 3 a is located in the blood vessel 32 based on the temperature information detected by the thermistor unit 20. When the puncture unit 3 a is not located in the blood vessel 32 The driving signal is transmitted to the transmitter 35a (corresponding to the signal transmitting means in the present invention). This drive signal is transmitted (transmitted) by the transmitter 35a, and is received by a receiver 35b (corresponding to the signal receiving means in the present invention) installed in a place away from the infusion needle unit 1, for example, a nurse station. And the notification lamp 30 installed in the same place as the receiver 35b lights up and warns according to this drive signal. The driving signal may be transmitted and received by connecting the transmitter 35a and the receiver 35b with a cable or the like, or may be transmitted without connecting the transmitter 35a and the receiver 35b with a cable or the like. May be transmitted / received (that is, transmission / reception of the drive signal may be wired or wireless). Furthermore, the control part 28 controls the clamp 34 when the puncture part 3a is not located in the blood vessel 32, and stops the flow of the tube 27 so that a chemical | medical solution may not flow to the infusion needle unit 1 side. The temperature monitor 29 receives a signal from the control unit 28 and displays temperature information detected by the thermistor unit 20 at a constant time interval (for example, every 0.1 second).

  Next, injection of the chemical solution by the above-described infusion device 25 and detection of the needle tip position of the infusion needle 2 (particularly, detection of needle dropout) will be described. First, as shown in FIGS. 2 (a) and 3 (a), the thermistor probe 4 of the infusion needle unit 1 is set to the storage position. Specifically, the thermistor probe 4 (slide base portion 21) connected to the control unit 28 via the conductive wire 24 is arranged on the rear side, and the thermistor unit 20 is set to the storage position stored inside from the puncture unit 3a. Next, the infusion needle unit 1 in this state is punctured into the blood vessel 32 of the patient. Thereafter, as shown in FIGS. 2B and 3B, the thermistor probe 4 of the infusion needle unit 1 is moved to the protruding position. Specifically, the thermistor probe 4 (slide base portion 21) is moved forward, and the puncture portion 3a is moved to the protruding position protruding from the thermistor portion 20. Thereby, the thermistor part 20 is exposed in the blood vessel 32. One end of the tube 27 whose other end is connected to the chemical solution bag 26 is connected in advance to the branch portion 9 and the internal air is excluded. And while inject | pouring the chemical | medical solution into the blood vessel 32, the temperature measurement of the thermistor part 20 is started.

  Here, when the puncture unit 3a is placed in the blood vessel 32 and the drug solution is normally injected, the drug solution flows from the opening of the puncture unit 3a into the blood vessel 32 at a constant flow rate. The temperature measured at is a temperature between the temperature of the drug solution (for example, room temperature) and body temperature (normal temperature). However, when the puncture unit 3a is removed from the blood vessel 32 and is located in a body tissue 33 (for example, skin tissue) other than the blood vessel 32, the flow of the chemical solution is stagnated, and therefore the temperature measured by the thermistor unit 20 Becomes almost the same temperature as the body temperature (abnormal temperature). When the puncture unit 3a is completely removed from the body, the temperature measured by the thermistor unit 20 is a temperature between the temperature of the drug solution and the room temperature (abnormal temperature. Note that the temperature of the drug solution is room temperature. Is room temperature). Thus, since the temperature measured by the thermistor unit 20 differs (changes) depending on the position of the puncture unit 3a, whether the puncture unit 3a is located in the blood vessel 32 and the drug solution is normally injected. Can be judged. That is, the temperature from the thermistor section 20 can be monitored, and the needle dropout of the infusion needle 2 can be detected by the change in temperature. For example, a predetermined temperature range may be set in advance, and it may be determined as “needle missing” when the detected temperature value is outside the predetermined temperature range. Further, a predetermined temperature change pattern may be set in advance, and “needle missing” may be determined when the temperature change pattern changes from the preset pattern.

  If the temperature measured by the thermistor unit 20 changes from the normal temperature to the abnormal temperature while the infusion needle unit 1 (puncture unit 3a) is placed in the blood vessel 32 and the medicinal solution is injected, the puncture unit The control unit 28 determines that 3a is not located in the blood vessel 32, and drives a notification lamp 30 installed in, for example, a nurse station to notify the surroundings. At the same time, the clamp 34 is controlled to stop the flow of the tube 27 so that the drug solution does not flow to the infusion needle unit 1 side. Further, since the temperature detected by the thermistor unit 20 is displayed on the temperature monitor 29, it is possible to easily recognize that the temperature has changed from the normal temperature to the abnormal temperature by checking the display on the temperature monitor 29. it can. Thereby, it can be easily determined that the puncture portion 3 a is not located in the blood vessel 32.

  As described above, the infusion needle unit 1 is provided with the thermistor portion 20 for measuring the temperature at the tip portion of the thermistor probe 4 so that the thermistor portion 20 can protrude from the tip of the needle tube portion. By detecting this change, it is possible to reliably detect that the infusion needle 2 is detached from the blood vessel 32. Moreover, it is not necessary to separately provide a receiving unit or the like outside the infusion needle unit 1, and the configuration can be simplified. Thereby, the manufacturing cost can be reduced. Further, since the thermistor probe 4 is provided with the flange portion 23 that is brought into contact with the rear end of the base end portion 8b and the movement toward the front end side is restricted on the slide base portion 21, the thermistor portion 20 can be easily positioned. it can. Moreover, it is possible to prevent the thermistor portion 20 from protruding too far from the tip of the needle tube portion, and to suppress the inconvenience that the inner wall of the blood vessel 32 is damaged. Furthermore, since the thermistor unit 20 can be moved between a storage position in which the thermistor unit 20 is stored inside the puncture unit 3a and a protruding position in which the thermistor unit 20 is protruded from the puncture unit 3a, the thermistor can be used when the infusion needle unit 1 is punctured. By maintaining the part 20 in the storage position, it is possible to prevent the puncture of the blood vessel 32 from being hindered by the thermistor part 20, and it is possible to suppress inconvenience associated with pain during puncture. Furthermore, since the thermistor part 20 protrudes from the puncture part 3a in the state in which the infusion needle unit 1 is detained in the blood vessel 32, the temperature can be detected more accurately. Further, even if the position of the infusion needle unit 1 is inadvertently shifted in this state, the thermistor portion 20 contacts the inner wall of the blood vessel 32 before the puncture portion 3a, so that the inconvenience of damaging the inner wall of the blood vessel 32 can be suppressed. Further, the thermistor probe 4 includes a slide base 21 at a position disengaged from the thermistor portion 20, and the slide base 21 can be moved from the rear end side to the front end side of the infusion needle 2 on the rear end side of the needle tube portion 3. Since the needle base portion 7 is supported in such a state, the thermistor portion 20 can be moved smoothly.

  In addition, since the infusion device 25 includes the temperature monitor 29 that displays temperature information detected by the thermistor section 20, it is possible to easily recognize a change in the temperature of the thermistor section 20. Thereby, it can be easily detected that the infusion needle 2 is detached from the blood vessel 32. Further, based on the temperature information detected by the thermistor unit 20, a control unit 28 that determines whether or not the puncture unit 3 a is located in the blood vessel 32, and when the puncture unit 3 a is not located in the blood vessel 32 Since the notification lamp 30 for notifying is provided, it can be detected more easily that the infusion needle 2 is detached from the blood vessel 32. In addition, the control unit 28 includes a transmitter 35a that transmits a signal when it is determined not to be located in the blood vessel 32, and a receiver 35b that receives a signal transmitted from the transmitter 35a. Since the notification lamp 30 notifies on the basis of the signal received by the machine 35b, the notification lamp 30 can be installed in a place away from the patient who has punctured the infusion needle unit 1, for example, a nurse station, etc. In addition, it is possible to detect that the infusion needle 2 is detached from the blood vessel 32.

  By the way, in 1st Embodiment mentioned above, although the flow of the tube 27 was controlled using the clamp 34, it is not restricted to this. For example, you may make it send a chemical | medical solution from the chemical | medical solution bag 26 to the infusion needle unit 1 side using an infusion pump. In this case, when the puncture unit 3 a is not located in the blood vessel 32, the control unit 28 controls (stops) the infusion pump or the like to stop the flow of the drug solution in the tube 27. In the first embodiment described above, the example in which the chemical solution from the chemical solution bag 26 is injected into the blood vessel is shown, but the present invention is not limited to this. For example, the infusion needle unit of the present invention can also be used when injecting blood from a transfusion bag into a blood vessel. Furthermore, the configurations of the slide base 21 and the needle base 7 are not limited to the above-described first embodiment. For example, the second embodiment shown in FIG. 5 is basically the same as the first embodiment, but differs in that a slide mechanism for guiding the movement of the slide base 21 is provided.

  Specifically, as shown in FIG. 5, the slide base 21 in the second embodiment is provided with a movement operation part 36 that protrudes outward from the outer periphery of the slide base 21. The movement operation unit 36 protrudes from the outer peripheral surface of the slide base 21 and is provided with a columnar locked portion 36a that can be locked to a part of the needle base 7, and a protruding end of the locked portion 36a. It is comprised from the disc-shaped moving operation piece 36b located in the outer side of the base main body 8 of the base 7. As shown in FIG. Further, a slit-like movement guide portion 38 that is engaged with the slide base portion 21 via the locked portion 36 a is formed in the base body 8 of the needle base portion 7 so as to extend along the moving direction of the thermistor probe 4. The width dimension W (width dimension along the circumferential direction of the base body 8) W is set slightly smaller than the diameter φd of the locked portion 36a (see FIG. 5a).

  And the latching | locking part 40 which can latch the to-be-latched part 36a is provided in the both ends of the movement guide part 38. As shown in FIG. Specifically, a storage member that locks the locked portion 36a in a state where the thermistor probe 4 is moved to the storage position at the rear end side (right side in FIG. 5A) of the movement guide portion 38. The locking portion 40a is provided, and a protruding locking portion 40b that locks the locked portion 36a in a state where the thermistor probe 4 has moved to the protruding position is provided at the end of the distal end side (left side in FIG. 5A). And the storage latching portion 40a and the projecting latching portion 40b are each configured by an opening hole having a diameter that is wider than the width dimension W of the movement guide portion 38 and can be held by the latched latched portion 36a without wobbling. doing. Further, an opening edge (an opening edge extending along the moving direction of the thermistor probe 4) located between the storage locking portion 40a and the protruding locking portion 40b in the movement guide portion 38 is set as the locked portion 36a. Is configured to be capable of guiding the locked portion 36a in the moving direction of the thermistor probe 4 along the locking guide portion 41.

  The base main body 8 includes a width dimension W of the movement guide portion 38 and a diameter of the locked portion 36a on an extension line of the movement guide portion 38 on the storage locking portion 40a side (right side in FIG. 5A). When an entrance notch groove 42 having a width narrower than φd is opened and opened at the end of the base body 8, and the thermistor probe 4 (slide base 21) is assembled to the infusion needle 2 (base body 8), the locked portion 36 a is configured to reach the movement guide portion 38 through the entry notch groove 42. Other configurations are the same as those of the first embodiment described above, and thus description thereof is omitted.

  In the infusion needle unit 1 including the movement guide unit 38 and the movement operation unit 36 having such a configuration, until the blood vessel 32 is punctured, the locked portion 36a is provided as illustrated by a solid line in FIG. The thermistor probe 4 (thermistor portion 20) is held by being locked to the storage locking portion 40a so as not to deviate from the storage position. Thereby, the thermistor part 20 can be sufficiently positioned at the storage position, and the inconvenience that the thermistor part 20 is carelessly moved to the protruding position can be eliminated. Then, after the infusion needle unit 1 is punctured into the blood vessel 32, the movement operation piece 36b of the movement operation unit 36 is pressed with a finger or the like from the storage locking part 40a side to the protruding locking part 40b side to perform a sliding operation. Then, the locked portion 36a is disengaged from the storage locking portion 40a, and the movement guide portion 38 (specifically, the locking guide portion 41) guides the locked portion 36a and the slide base 21 along the moving direction. Therefore, the thermistor portion 20 can be moved smoothly. Moreover, since the thermistor probe 4 can be moved by operating the movement operation unit 36, the thermistor unit 20 can be moved more easily. Thereby, the indwelling preparation work (needle drop detection preparation work) of the infusion needle unit 1 can be completed quickly.

  When the moving operation unit 36 is fully slid, the locked portion 36a is locked to the protruding locking portion 40b as shown by a two-dot chain line in FIG. 5, and the thermistor probe 4 (thermistor portion 20) is moved. It is maintained so as not to deviate from the protruding position. Thereby, positioning of the thermistor part 20 in a protrusion position can fully be performed. Further, it is possible to eliminate the inconvenience that the thermistor unit 20 is inadvertently moved to the storage position while the infusion needle unit 1 is placed in the blood vessel 32 and the thermistor unit 20 is stored in the puncture unit 3a.

By the way, in 2nd Embodiment, you may provide the urging | biasing member 43 which urges | biases the slide base 21 to the direction which moves to a protrusion position from an accommodation position. For example, in the modification of the second embodiment shown in FIG. 5, an urging member 43 formed of a coil spring is provided between the needle base 7 and the slide base 21 inside the base storage space 12. Arranged in a state of being wrapped around. Specifically, one end of the biasing member 43 is engaged with the seal member 14, and the other end is engaged with the slide base 21, and the slide base 21 is projected from the storage position by the biasing force of the biasing member 43. Is biased in the direction of movement (in the direction of the arrow in FIG. 6). When such a biasing member 43 is provided, the moving operation unit 36 is slid from the state where the thermistor probe 4 (thermistor unit 20) is maintained at the storage position, and the locked portion 36a and the storage lock are provided. When the locking state with the portion 40a is released, the slide base portion 21 is biased by the biasing force of the biasing member 43, and the thermistor portion 20 moves from the storage position to the protruding position. Furthermore, the to-be-latched part 36a is latched by the protrusion latching | locking part 40b by the moving force of the thermistor probe 4, and the thermistor part 20 is maintained so that it may not shift | deviate from a protrusion position. Thereby, the movement operation | movement to the protrusion position of the thermistor part 20 can be performed only by one-touch operation which removes the to-be-latched part 36a from the accommodation latching | locking part 40a. Therefore, the indwelling preparation work (needle drop detection preparation work) of the infusion needle unit 1 can be quickly completed.
In addition, the urging member 43 in the present invention is not limited to being configured by a coil spring. In short, any configuration of the biasing member 43 may be employed as long as the slide base 21 can be biased in the direction of moving from the storage position to the protruding position.

  By the way, in the said 2nd Embodiment and its modification, if a protrusion is formed in the surface (location where a finger etc. touch at the time of operation) of a movement operation piece of a movement operation part, it will become easy to catch a finger on a movement operation part, and a thermistor part It is possible to improve the operability of movement. In addition, while the slide base is provided with the locked portion, the needle base is provided with the lock portion, the present invention is not limited to this. The point is that either the needle base or the slide base has a locked portion and the other has a locked portion. For example, the slide base has a locking portion, while the needle base has a locked portion. May be provided.

  Furthermore, the structures of the locked portion 36a and the locking portion 40 are not limited to the structures disclosed in the second embodiment and the modifications thereof. For example, a claw-like locked portion is provided at one end of a swingable plate, and a locking operation portion that can be swung by an operator is provided at the other end. You may form by the hollow which a part can latch. In order to release the locked state between the locked portion and the locked portion, the locked portion may be removed from the locked portion by operating the locking operation portion and swinging the plate. Good. At this time, if the urging member is provided between the slide base and the needle base, it is preferable that the thermistor probe can be moved to the protruding position only by one-touch operation of the locking operation part.

  Moreover, in the said 2nd Embodiment and its modification, it comprised so that the slide base 21 and the to-be-latched part 36a might be guided along the moving direction of the thermistor probe 4 by the movement guide part 38 (locking guide part 41). However, the present invention is not limited to this. In short, it suffices if the slide base is guided by the movement guide part and the locked part can be guided by the locking guide part, and the movement guide part and the locking guide part may be provided separately. For example, the base storage space of the needle base may be set slightly larger than the slide base so that the slide base can slide on the inner peripheral surface of the base body of the needle base along the moving direction of the thermistor probe. . That is, the inner peripheral surface of the base main body may function as a movement guide portion in the present invention. Further, in the second embodiment and the modification thereof, the movement guide portion 38 (locking guide portion 41) is formed linearly along the movement direction of the slide base portion 21 (the central axis direction of the base body 8). The present invention is not limited to this. For example, the movement guide part (locking guide part) extends in the direction of movement of the slide base partly from the rear end of the base body to the middle, and from there the direction orthogonal to the direction of movement of the slide base (the circumferential direction of the base body 8) ) And then extending again in the direction of movement of the slide base. Further, the movement guide portion (locking guide portion) may meander in an S shape or be bent a plurality of times. In short, as long as the locked portion can move between the storage locking portion and the protruding locking portion, the movement guide portion (locking guide portion) may have any shape.

  By the way, in the said 2nd Embodiment and its modification, although a part of movement operation part 36 was used as the to-be-latched part 36a, this invention is not limited to this. For example, a locked portion may be provided on the slide base separately from the movement operation portion. In the second embodiment and its modification, a configuration for guiding the movement of the thermistor probe 4 (movement guide portion 38) and a configuration for maintaining the position of the thermistor probe 4 (the locked portion 36a and the locking portion 40). And the form of the infusion needle unit 1 provided with the configuration (the movement operation unit 36) for operating the movement of the thermistor probe 4 is illustrated, but the present invention is not limited to this. The form of the infusion needle unit according to the present invention may include at least one of the configuration of the movement guide portion, the locked portion and the locking portion, and the inner needle movement operation portion.

  In the infusion needle unit 1 of each embodiment described above, the infusion needle 2 in which the needle tube portion 3 is formed of an elongated metal tube is used. However, the present invention is not limited to this. A catheter or an indwelling needle in which the needle tube portion is made of a flexible resin or the like can also be used as the infusion needle of the present invention. For example, in the infusion needle 2 ′ (indwelling needle) shown in FIG. 7, the needle tube portion 3 ′ is formed of a flexible resin or the like. In such an infusion needle 2 ′, the tip of the needle tube portion 3 ′ is formed in a flat shape so that the tip is not sharp (no puncture portion is provided at the tip), and the needle tube portion 3 ′ of the infusion needle 2 ′ is punctured into the blood vessel 32. When doing so, an elongated metal inner needle (not shown) is used. Specifically, an inner needle with a sharp tip is inserted into the needle tube portion 3 ′ of the infusion needle 2 ′, and the infusion needle 2 ′ is punctured into the blood vessel 32 with the tip protruding from the tip of the needle tube portion 3 ′. . Then, after the tip of the needle tube portion 3 'is punctured into the blood vessel 32, the inner needle is removed from the infusion needle 2', so that the needle tube portion 3 'of the infusion needle 2' is removed as shown in FIG. It is placed in the blood vessel 32. In this state, if the thermistor probe 4 is inserted into the infusion needle 2 'from the base body 8 side and the thermistor part 20 protrudes from the tip of the needle tube part 3' as shown in FIG. The temperature of the tip of the needle tube portion 3 ′ can be detected by the portion 20. As described above, also in the infusion needle unit 1 ′ separately provided with the infusion needle 2 ′ and the needle tube portion 3 ′, needle dropout can be detected as in the above-described embodiments. Other configurations are the same as those of the first embodiment described above, and thus description thereof is omitted.

  Further, in each of the above embodiments, the inner diameter of the needle tube channel 5 in the needle tube unit 3 is set larger than the diameter of the probe unit 19, and the probe unit 19 is inserted into the center of the needle tube channel 5, so that the needle tube channel 5 Although the space between the inner wall and the probe portion 19 is formed in a cylindrical shape, the present invention is not limited to this. In short, any configuration may be used as long as a space through which a liquid can pass is formed between the thermistor probe and the needle tube portion. For example, a groove is formed on the outer peripheral surface of the probe portion, or a flat surface is formed (configured so that the cross section of the probe portion is D-shaped), and the outer peripheral surface of the probe portion and the needle tube flow path (needle tube portion) A gap through which the liquid can pass may be provided between the inner peripheral surface of the first and second inner peripheral surfaces. However, if the gap is too narrow, there is a possibility that the chemical solution is likely to stay. Therefore, as shown in the above embodiments, it is preferable to form a cylindrical flow path.

  Moreover, in each said embodiment, although the thermistor probe 4 (thermistor part 20) was used as a means to measure temperature, this invention is not limited to this. For example, various temperature sensors such as a thermocouple can be used. Moreover, in each said embodiment, although the alerting | reporting lamp was used as an alerting | reporting means, this invention is not limited to this. For example, an alarm device that sounds an alarm sound may be used. Furthermore, in each said embodiment, although the temperature monitor 29 and the alerting | reporting lamp 30 were provided in the infusion apparatus 25, the structure provided with at least any one may be sufficient. Moreover, in order to make it easy to fix the infusion needle in the present invention to the patient with a tape, a plate-like protruding piece (so-called “blade”) may protrude from the side of the infusion needle.

  The above-described embodiment should be considered as illustrative in all points and not restrictive. The present invention is not limited to the above description, but is defined by the scope of the claims, and includes all modifications within the scope and meaning equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Infusion needle unit 2 Infusion needle 3 Needle tube part 3a Puncture part 4 Thermistor probe 5 Needle tube flow path 7 Needle base part 8 Base body 8a Tip part 8b Base end part 9 Branch part 11 Communication space 12 Base storage space part 13 Connection space 14 Seal member DESCRIPTION OF SYMBOLS 15 Seal through-hole 16 Communication flow path 16a Tube connection space 16b End flow path 17 Branch side male thread part 19 Probe part 20 Thermistor part 21 Slide base 22 Conductor connection empty part 24 Conductor 25 Infusion device 26 Chemical solution bag 27 Tube 28 Control part 29 Temperature monitor 30 Notification lamp 31 Drip tube 32 Blood vessel 33 Body tissue 34 Clamp 35a Transmitter 35b Receiver 36 Movement operation part 36a Engagement part 36b Movement operation piece 38 Movement guide part 40 Engagement part 40a Storage engagement part 40b Projection mechanism Stop part 41 Locking guide part 42 Entrance notch groove 43 Energizing Wood

Claims (13)

An infusion needle body having a tubular needle tube portion with an open tip;
An infusion needle comprising: a storage portion capable of holding the wire so as to form a space through which the liquid can pass between the inner surface of the needle tube portion when the wire is inserted inside the needle tube portion. And
The infusion needle, wherein the storage portion holds a temperature sensor portion provided at a distal end portion of the wire rod so as to protrude from the distal end of the needle tube portion.   2. The infusion needle according to claim 1, wherein the storage portion includes a movement restricting portion that abuts a part of the wire and restricts movement toward a distal end side. An infusion needle according to claim 1 or claim 2;
A wire rod that is movable between a storage position in which the temperature sensor unit is stored inside the tip of the needle tube unit and a protruding position in which the temperature sensor unit is protruded from the tip of the needle tube unit. Features an infusion needle unit. The wire includes a slide base at a position away from the temperature sensor,
The needle base part which supports the said slide base part in the state which can be moved toward the front end side from the rear end side of the said infusion needle to the rear end side of the said needle tube part is provided. Infusion needle unit.   The infusion needle unit according to claim 4, wherein the needle base portion includes a movement guide portion that guides the slide base portion along the movement direction.   The infusion needle unit according to claim 4 or 5, wherein the slide base includes a moving operation unit that protrudes outward from the slide base. One of the needle base or slide base is provided with a locked portion, and the other is provided with a locking portion capable of locking the locked portion,
The locking portion includes a storage locking portion that locks the locked portion in the storage position of the wire, and a protruding locking portion that locks the locked portion in the protruding position of the wire. The infusion needle unit according to any one of claims 4 to 6, wherein the infusion needle unit is provided. An infusion needle according to claim 1 or claim 2;
A wire rod that is movable between a storage position in which the temperature sensor unit is stored inside from the tip of the needle tube unit and a protruding position in which the temperature sensor unit is protruded from the tip of the needle tube unit;
A temperature detecting means for detecting a temperature change based on temperature information detected by the temperature sensor portion protruding from the tip of the needle tube portion in a state where the tip of the needle tube portion is punctured into the body and liquid is injected; An infusion device comprising: The infusion needle unit according to any one of claims 3 to 7,
A temperature detecting means for detecting a temperature change based on temperature information detected by the temperature sensor portion protruding from the tip of the needle tube portion in a state where the tip of the needle tube portion is punctured into the body and liquid is injected; An infusion device comprising: Based on the temperature information detected by the temperature sensor unit, an infusion needle position determination unit that determines whether or not the tip of the needle tube unit is located in the blood vessel,
Informing means for informing when the tip of the needle tube part is not located in the blood vessel;
An infusion device according to claim 8 or 9, characterized by comprising: A signal transmitting means for transmitting a signal when the infusion needle position determining means determines that the tip of the needle tube portion is not located in the blood vessel;
Signal receiving means for receiving a signal sent from the signal transmitting means,
The infusion device according to claim 10, wherein the notifying means notifies based on a signal received by the signal receiving means. A needle drop detection system for an infusion needle having a tubular needle tube portion with an open tip,
In a state where the tip of the needle tube part is punctured into the body and liquid is injected, a temperature sensor part that protrudes from the tip of the needle tube part and measures the temperature,
Based on the temperature information detected by the temperature sensor unit, an infusion needle position determination unit that determines whether or not the tip of the needle tube unit is located in the blood vessel,
Informing means for informing when the tip of the needle tube part is not located in the blood vessel;
A needle missing detection system characterized by comprising: A signal transmitting means for transmitting a signal when the infusion needle position determining means determines that the tip of the needle tube portion is not located in the blood vessel;
Signal receiving means for receiving a signal sent from the signal transmitting means,
The needle dropout detection system according to claim 12, wherein the notifying means notifies based on a signal received by the signal receiving means.

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