JP2010081952A - Apparatus for detecting fall of indwelling needle and indwelling needle assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for detecting a fall of an indwelling needle capable of visually detecting whether the falling situation, where the tip of the indwelling needle is fallen out from a blood vessel, happens during administration of a liquid in the blood vessel of a patient by using the indwelling needle. <P>SOLUTION: The apparatus includes: an indwelling needle assembly 2 having a light emitter 3 for generating light, and a tip 12B for passing the light L from the light emitter 3 into the inside and indwelling it in the blood vessel 100; and a light emitting driver 4 for generating the light L from the light emitter 3 as a sustained light emission and/or a pulse light emission. The apparatus is configured such that the light L from the light emitter 3 is emitted from the tip 12B of an indwelling needle body of the indwelling needle assembly 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an indwelling needle omission detection device, and in particular, for example, when an indwelling needle is removed from within a blood vessel when a drug solution is instilled into the blood vessel, the operator can visually detect the indwelling needle omission. The present invention relates to a detection device and an indwelling needle assembly.

The indwelling needle is used, for example, for external circulation in artificial dialysis by indwelling the tip (needle tip) in the blood vessel, or for administering a drug solution into the blood vessel by infusion. An example of the structure of the indwelling needle is described in Patent Document 1, and the tip (needle tip) of the indwelling needle is inserted into the blood vessel, and the medicinal solution is administered from the medicinal solution bag into the blood vessel through the indwelling needle. ing.
JP 2003-720 A

However, if the operator uses a conventional indwelling needle to administer a drug solution into the patient's blood vessel, the operator can check whether the so-called indwelling needle has been pulled out. It is desired that a person can easily detect it visually.
Therefore, in order to solve the above-described problems, the present invention causes a so-called needle removal state of the indwelling needle in which the tip of the indwelling needle comes out of the blood vessel during the administration of the liquid into the blood vessel of the patient using the indwelling needle. It is an object of the present invention to provide an indwelling needle omission detection device and an indwelling needle assembly that allow an operator to easily visually detect whether or not an indwelling needle is present.

  The indwelling needle omission detecting device of the present invention is an indwelling needle holding an indwelling needle main body having a light emitting unit for generating light and a tip for indwelling the light from the light emitting unit through the inside. An assembly and a light emission drive unit that continuously emits light and / or pulses light from the light emitting unit, and the light from the light emitting unit is emitted from the tip of the indwelling needle body. It is characterized by.

In the indwelling needle removal device according to the present invention, preferably, at least a part of the indwelling needle assembly constitutes a light guide part that guides the light from the light emitting part to the tip of the indwelling needle body. It is characterized by that.
In the indwelling needle omission detecting device of the present invention, it is preferable that the light guide portion is a light reflecting member that reflects the light from the light emitting portion.

In the needle dropout detecting device for an indwelling needle of the present invention, preferably, the light guide portion is a light reflecting film formed by coating.
In the indwelling needle removal detection device of the present invention, it is preferable that the light guide portion is a light shielding portion that shields the light from the light emitting portion.

In the indwelling needle removal device according to the present invention, preferably, the light emitting unit is detachable from the indwelling needle assembly, and the light emitting unit has a chemical solution blocking member that prevents contact with the chemical solution. It is characterized by that.
In the indwelling needle omission detecting device of the present invention, preferably, the light from the light emitting unit has a specific wavelength having an absorption peak in a specific substance in blood.

In the indwelling needle omission detecting device of the present invention, it is preferable that the light emitting unit generates light having a wavelength near 660 nm having an optical absorption peak of reduced hemoglobin when the blood vessel is a vein. It is characterized by.
In the indwelling needle removal device of the present invention, it is preferable that the light emission drive unit can change a light emission pulse interval of the light emission unit and / or can selectively change the continuous light emission and the pulse light emission. It is characterized by comprising mode selection means.
The indwelling needle assembly of the present invention includes a substantially cylindrical catheter hub as a casing member, a catheter as an indwelling needle main body held at one end of the catheter hub, the catheter and an inner part inserted into the catheter hub. A needle and a connecting portion for connecting an infusion tube provided on the catheter hub, and a light emitting portion is provided at the other end of the catheter hub, and light from the light emitting portion is transmitted to the catheter hub. It is characterized by being configured to radiate from the tip of the indwelling needle body

  According to the indwelling needle omission detection device of the present invention, a so-called indwelling needle occlusion state occurs in which the tip of the indwelling needle comes out of the blood vessel during administration of the liquid into the blood vessel of the patient using the indwelling needle. The operator can easily detect visually whether or not

Hereinafter, a preferred embodiment of an indwelling needle omission detection device of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing a preferred embodiment of the indwelling needle omission detection device of the present invention. 2 is a sectional view in the axial direction of the indwelling needle main body showing a state in which the inner needle is inserted into the indwelling needle assembly shown in FIG. 1, and FIG. 3 is a plan view of the indwelling needle assembly shown in FIG. It is sectional drawing of the axial direction of the indwelling needle which shows the state by which the inner needle was removed and the light emission part was detachably mounted | worn with respect to the indwelling needle assembly.

As shown in FIG. 1, the indwelling needle removal device 1 includes an indwelling needle assembly 2 having a light emitting unit 3, a light emission driving unit 4, a control unit 5, and a mode selection switch (mode selection means) 6. I have. The control unit 5 includes a CPU such as a microcomputer, a ROM for storing a control program for the entire apparatus executed by the CPU and various data, and a RAM for temporarily storing measurement data and various data as a work area. . The indwelling needle assembly 2 shown in FIG. 1 is used, for example, when the drug solution W is instilled into the blood vessel (vein) 100 from the drug solution bag 200 shown in FIG. As shown in detail in FIG. 2, the indwelling needle assembly 2 has a catheter hub 10, a connector portion 11, a catheter 12 as an outer cylinder, and an inner needle 14. The catheter 12 is, for example, an indwelling needle body that is placed in a patient's skin blood vessel (vein) during infusion treatment. The catheter hub 10 is a substantially cylindrical casing member, and is made of, for example, plastic. A connector portion 11 is provided at a middle portion of the catheter hub 10 so as to protrude in a direction orthogonal to the axial direction CL of the catheter hub 10.

A rear end portion of a thin hollow catheter 12 is connected and fixed to the distal end portion 10B of the catheter hub 10 shown in FIG. The catheter 12 is made of plastic, for example, and the catheter 12 has a tip (needle tip) 12B.
The chemical solution bag 200 shown in FIGS. 1 and 2 is connected to an infusion tube 201 for drip, and a lock connector part 202 is attached to a tip part 205 of the tube 201. The lock connector part 202 has a female screw 203 and the connector part 11 has a male screw 204.

As a result, the operator turns the lock connector part 202 to engage the female screw 203 of the lock connector part 202 with the male screw 204 of the connector part 11, so that the tip part 205 of the tube 201 causes the filter 13 of the connector part 11 to move. The tube 201, the catheter hub 10 and the inside of the catheter 12 can be connected while being pierced. Therefore, the drug solution W in the drug solution bag 200 is supplied into the catheter hub 10 through the tube 201 and the connector unit 11, and can be dispensed into the blood vessel 100 from the distal end 12 </ b> B of the catheter 12 through the catheter 12.

As shown in FIG. 2, the inner needle 14 is inserted and arranged inside the catheter hub 10 and the catheter 12. The inner needle 14 is a metal thin rod-like member, and the distal end portion 15 of the inner needle 14 is inclined with respect to the axial direction CL so as to be easily inserted into the skin surface 120 and the blood vessel 100 of the patient. A sharp tip formed by excision is formed. A rear end portion 14 </ b> C of the inner needle 14 is fixed to the inner needle hub 16. The inner needle hub 16 is a grip part for an operator to remove the inner needle 14 from the catheter 12 and the catheter hub 10.

A portion 17 of the inner needle 14 is disposed inside the catheter 12, but a distal end portion 15 of the inner needle 14 protrudes from the distal end 12 </ b> B of the catheter 12. The remaining portion 18 of the inner needle 14 is disposed within the catheter hub 10 and passes through the hemostasis valve 19.
When the operator holds the inner needle hub 16 shown in FIG. 2 and pulls the inner needle 14 in the S direction along the axial direction CL, the attachment end 20 of the catheter hub 10 is moved from the catheter 12 and the catheter hub 10. It can be removed after that.

Next, the light emission part 3 is demonstrated with reference to FIG. 3 and FIG.
FIG. 4 is a perspective view showing a structural example of the light emitting portion 3 and the attachment end portion 20 of the catheter hub 10. 3 and 4, the inner needle 14 has been removed from the indwelling needle assembly 2.
After the inner needle 14 shown in FIG. 2 is removed from the catheter 12 and the catheter hub 10, the operator can attach and detach the light emitting part 3 shown in FIGS. 3 and 4 to the attachment end 20 side of the catheter hub 10. Can be installed.
As shown in FIGS. 3 and 4, the light emitting unit 3 includes a cylindrical gripping portion 30, a cylindrical insertion portion 31, and a light emitting element 32. The cylindrical grip portion 30 and the cylindrical insertion portion 31 are integrally formed of plastic, for example, and the light emitting element 32 is disposed in the internal space 33 of the grip portion 30. The light emitting element 32 is disposed corresponding to a hole 30H which is a through hole formed at the center of the cylindrical gripping portion 30, and the light L generated by the light emitting element 32 passes through the hole 30H along the axial direction CL. Thus, radiation can be emitted from the distal end 12B of the catheter 12 to the outside through the inside of the catheter hub 10 and the catheter 12.

As shown in FIG. 4, the attachment end 20 of the catheter hub 10 has a recess 34 for insertion. The insertion part 31 of the light emitting part 3 is detachably fitted to and held by the concave part 34 of the attachment end part 20.
The insertion portion 31 of the light emitting unit 3 has a cylindrical portion 35 and two convex portions 36 and 36. The two convex-shaped parts 36 and 36 are formed in the position which protrudes from the outer peripheral surface of the cylindrical part 35 in the radial direction, and mutually opposes, and has a cross-sectional triangle shape.
On the other hand, the insertion recess 34 has an inner peripheral surface 37 and two concave portions 38, 38 having a triangular cross section. The inner peripheral portion 37 is a portion that holds the cylindrical portion 35 of the insertion portion 31, and the two convex-shaped portions 36 and 36 are fitted into the two concave-shaped portions 38 and 38, respectively.

Accordingly, the light emitting unit 3 can be detachably held with respect to the attachment end 20 of the catheter hub 10, and the light emission unit 3 is positioned so as not to rotate about the axial direction CL with respect to the attachment end 20 of the catheter hub 10. it can. Thus, since the light emitting part 3 can be detachably held with respect to the attachment end 20 of the catheter hub 10, the plastic catheter 12 and the catheter hub 10 of the indwelling needle assembly 2 are disposable from the viewpoint of hygiene and the like. On the other hand, the light emitting unit 3 can be reused any number of times.
For this reason, the indwelling needle assembly 2 including the light emitting unit 3 of the illustrated example can achieve cost reduction compared to the case where the catheter, the catheter hub, and the light emitting unit are all discarded.
In addition, the optical axis of the light L generated by the light emitting element 32 of the light emitting unit 3 can be made to coincide with the axial direction CL of the catheter 12 and the catheter hub 10, and the alignment of the optical axis at the time of light emission is not shifted.

As shown in FIG. 3, a liquid-tight film-like light transmission member 38 </ b> P made of, for example, a synthetic resin film is disposed at the end of the cylindrical portion 35 of the insertion portion 31 of the light emitting unit 3. The light transmitting member 38P is a chemical solution blocking member that prevents the chemical solution supplied into the catheter hub 10 from coming into contact with the chemical solution W so as not to leak to the light emitting unit 3 side. Thereby, since the chemical | medical solution W does not contact the light emission part 3, the light emission part 3 is not contaminated with the chemical | medical solution W, and can reuse the light emission part 3 easily.
The light transmitting member 38P transmits the light L generated by the light emitting element 32, and the light L passes through the catheter hub 10 and the catheter 12 and is emitted from the opening of the distal end (needle tip) 12B of the catheter 12. It has a structure that emits light.

For example, a light emitting diode (LED) or a laser diode (LD) can be used as the light emitting element 32 shown in FIGS. For example, when the blood vessel 100 shown in FIG. 1 is a vein, the light emitting element 32 generates light having a wavelength (near 660 nm) having an absorption peak in a specific element of blood such as reduced hemoglobin.
As shown in FIGS. 1 and 3, the light emitting element 32 is electrically connected to the light emission drive unit 4, and as shown in FIG. 1, the light emission drive unit 4 includes a control unit 5 and a mode selection switch (mode). Selection means) 6 is electrically connected.

The mode selection switch 6 shown in FIG. 1 is a switch for enabling selection of two modes, that is, an indwelling technique mode and an infusion mode.
When the operator selects the indwelling procedure mode with the mode selection switch 6, a drive signal R is supplied from the light emission drive unit 4 to the light emitting element 32 of the light emitting unit 3 according to an instruction from the control unit 5, and the light emitting element 32 emits light continuously. Or the light L which emits light continuously is generated.
When the operator selects the in-drip mode with the mode selection switch 6, a drive signal R 1 is supplied from the light emission drive unit 4 to the light emitting element 32 of the light emitting unit 3 according to an instruction from the control unit 5, and the light emitting element 32 is pulsed. Light L that emits light (intermittent light emission) is generated.

Further, as shown in FIG. 3, a light reflecting member 80 as a light guiding portion is formed on the inner surface of the catheter 12 and the inner surface of the catheter hub 10 by coating or vapor deposition. The light reflecting member 80 is formed to guide the light L generated by the light emitting element 32 to the distal end 12B of the catheter 12 so as not to leak outside the catheter hub 10 and the catheter 12.
Thereby, the light reflecting member 80 can efficiently reflect the light L generated by the light emitting element 32 and guide it to the distal end (needle tip) 12B of the catheter 12. As shown in FIG. 3, the light reflecting member 80 is desirably formed also on the inner peripheral surface of the cylindrical portion 35.
Here, in the example illustrated in FIG. 3, as described above, the light guide portion is the light reflecting member 80 that reflects the light L from the light emitting element 32 of the light emitting portion 3. In this case, the light reflecting member 80 is formed, for example, by applying a silver paste or metal deposition.
However, the present invention is not limited to this, and the catheter hub 10 and the catheter 12 may be formed of a material that functions as a reflection portion that can reflect the light L without leaking to the outside.
The light guiding portion can be formed on at least a part of the indwelling needle assembly 2, for example, only the catheter hub 10, or the catheter 10 in addition to the catheter hub 10. By forming at least a part of the inner surface of the catheter 12 of the indwelling needle assembly 2 and the catheter hub 10 in two colors, a light reflecting portion that is a light guiding portion can be formed.

Next, an example of use of the above-described indwelling needle removal device 1 will be described.
As shown in FIG. 2, the inner needle 14 is disposed inside the catheter 12 along the axial direction CL, but the distal end portion 15 projects from the distal end 12 </ b> B of the catheter 12. The remaining portion 18 of the inner needle 14 is disposed within the catheter hub 10 and passes through the hemostasis valve 19. As shown in FIG. 1, the chemical solution bag 200 is connected to the connector portion 11 of the indwelling needle assembly 2 via an infusion tube 201.

As shown in FIGS. 1 and 2, the operator passes the distal end portion 15 of the inner needle 14 and the distal end 12B of the catheter 12 as the indwelling needle body through the skin surface 120 of the patient and the blood vessel 100 inside the skin surface 120. Puncture into the blood vessel 100. After confirming flashback into the inner needle hub 16, the operator pulls the inner needle hub 16 shown in FIG. 2 in the S direction to remove the inner needle 14 from the catheter 12 and the catheter hub 10. The distal end 12B of the catheter 12, which is the needle body, is placed in the blood vessel 100.

As shown in FIGS. 3 and 4, the light emitting unit 3 is detachably held with respect to the attachment end 20 of the catheter hub 10, and the light emission unit 3 has an axial direction CL with respect to the attachment end 20 of the catheter hub 10. The optical axis of the light L generated by the light emitting element 32 of the light emitting unit 3 can be aligned with the axial direction CL of the catheter 12 and the catheter hub 10 so as not to rotate around the center, and the alignment of the optical axis at the time of light emission is aligned. Positioning can be performed without shifting.
The chemical solution in the chemical solution bag 200 shown in FIG. 1 enters the catheter hub 10 of the indwelling needle assembly 2 through the drip tube 201 and the connector portion 11 of the indwelling needle assembly 2, passes through the catheter 12, and reaches the tip 12 </ b> B of the catheter 12. Liquid is fed into the blood vessel 100 from the opening.

  The light L generated by the light emitting element 32 shown in FIG. 3 is generated when the distal end 12B of the catheter 12 is not in the blood vessel 100 as shown in FIG. The light L radiated from the twelve tips 12B is scattered to the peripheral region of the patient's tissue and the tissue 300 to become scattered light LM. Therefore, the operator can visually confirm the red scattered light LM having a wavelength of 660 nm around the distal end 12B of the catheter 12. That is, when the distal end 12B of the catheter 12 of the indwelling needle assembly 2 is outside the blood vessel 100, the light L generated by the light emitting element 32 of the light emitting unit 3 is transmitted from the distal end 12B of the catheter 12 of the indwelling needle assembly 2. Although it is irradiated, the scattered light LM shines red from the distal end 12B of the catheter 12 of the indwelling needle assembly 2 because the reduced hemoglobin is less in the peripheral region of the tissue and the tissue 300 than in the blood vessel 100.

In contrast, the light L generated by the light emitting element 32 shown in FIG. 3 is inserted into the blood vessel 100 when the distal end 12B of the catheter 12 is in the blood vessel 100 as shown in FIG. 5B. In this case, red light having a wavelength of 660 nm is absorbed by red blood cells (hemoglobin) in the blood vessel 100, and the light L emitted from the distal end 12B of the catheter 12 becomes scattered light LP. For this reason, as shown in FIG. 5A, compared to the intensity of the scattered light LM when the distal end 12B of the catheter 12 is outside the blood vessel 100 as shown in FIG. When it is within 100, the intensity of the scattered light LP is lowered. The operator can visually confirm red scattered light LP having a wavelength of 660 nm around the distal end 12B of the catheter 12.

As shown in FIG. 1, in the indwelling operation work in which the indwelling needle assembly 2 is indwelled in the blood vessel 100, it is preferable to always monitor the light emission state from the distal end 12B of the catheter 12 of the indwelling needle assembly 2. It is easy to confirm whether the distal end 12B of 12 is in a state in which the needle has been removed from the blood vessel 100 or in a state in which the needle has not been removed (presence / absence of the needle removal state).
However, once the distal end 12B of the catheter 12 is indwelled in the blood vessel 100, it is confirmed whether the distal end 12B of the catheter 12 is in a state where the needle has been removed from the blood vessel 100 or has not been removed. In this case, it may be easier to check the needle removal state when the optical signal from the light emitting element 32 of the light emitting unit 2 emits light in a pulsed manner (intermittently).

When the light emitting element 32 emits light continuously (sustained light emission), the distal end 12B of the catheter 12 of the indwelling needle assembly 2 is immediately detached from the blood vessel 100 on the spot from the intensity of scattered light. However, when the light emitting element 32 emits light in a pulsed manner (pulse light emission), the distal end 12B of the catheter 12 is moved by the difference in intensity of the pulsed light. It becomes easy to confirm whether or not the blood vessel 100 is detached.
That is, when the operator visually observes from the patient's body surface, if the difference in intensity of the pulsed light is large, the distal end 12B of the catheter 12 is detached from the blood vessel 100 and the pulsed light When the difference between the strengths is small, it can be determined that the distal end 12B of the catheter 12 remains in the blood vessel 100.

Therefore, the operator operates the mode selection switch 6 shown in FIG. 1 to select one of the two modes of the indwelling technique mode and the drip mode. When the operator selects the in-dwelling procedure mode with the mode selection switch 6, a drive signal R is sent from the light emission drive unit 4 to the light emitting element 32, and the light emitting element 32 generates light L that emits light continuously.
When the operator selects the in-drip mode with the mode selection switch 6, a drive signal R1 is sent from the light emission drive unit 4 to the light emitting element 32, and the light emitting element 32 generates light L that emits pulses (intermittent light emission). . Therefore, the operator can easily determine whether or not the needle is missing in the indwelling technique mode and the drip mode.

  As described above, by using the indwelling needle removal device 1 according to the embodiment of the present invention, the operator can visually inspect the distal end of the indwelling needle while having a relatively inexpensive configuration. It is possible to easily detect whether the needle is missing or whether it is missing from the blood vessel, which is useful for reducing medical incidents (occurrence of erroneous medical care) in infusion work, for example. In addition, since the light emitting element 32 generates pulsed light, power saving can be achieved as compared with a case where continuous light is always generated.

6 and 7 are perspective views showing another embodiment of the present invention.
The embodiment of the present invention shown in FIG. 6 can be used in place of the embodiment of the present invention shown in FIG. The light emitting unit 3 includes a cylindrical gripping part 30, a tapered (tapered) insertion part 31 </ b> G, and a light emitting element 32 disposed in the gripping part 30. The cylindrical grip portion 30 and the tapered insertion portion 31G are made of, for example, plastic, and the light emitting element 32 is disposed in the internal space 30H of the grip portion 30.

As shown in FIG. 6, the attachment end portion 20 of the catheter hub 10 has a recess 34G for insertion. The insertion concave portion 34G is gradually reduced in diameter and tapered toward the inside. The insertion part 31G of the light emitting part 3 is detachably fitted to and held by the concave part 34G of the attachment end part 20.
In this case, since the insertion portion 31G is tapered, positioning guide in the insertion fitting operation is facilitated.
Thus, the light emitting unit 3 can be detachably held with respect to the attachment end 20 of the catheter hub 10, and the optical axis of the light L generated by the light emitting element 32 of the light emitting unit 3 and the axial direction CL of the catheter 12 and the catheter hub 10. And can be positioned so that the alignment of the optical axis during light emission is not shifted.

The embodiment of the present invention shown in FIG. 7 can be used in place of the embodiment of the present invention shown in FIG. 4 or the embodiment of the present invention shown in FIG. The light emitting unit 3 includes a cylindrical gripping part 30, an insertion part 31 </ b> H having an elliptical cross section, and a light emitting element 32 disposed in the gripping part 30. The cylindrical grip portion 30 and the insertion portion 31H are made of, for example, plastic, and the light emitting element 32 is disposed in the internal space 33 of the grip portion 30.

As shown in FIG. 7, the attachment end 20 of the catheter hub 10 has a recess 34H for insertion. The recess 34H for insertion has an elliptical cross section. The insertion part 31 </ b> H of the light emitting part 3 is formed in an elliptical cross section so as to fit the concave part 34 </ b> H of the attachment end part 20.
Thereby, the insertion part 31H of the light emitting part 3 is detachably fitted to the concave part 34H of the attachment end part 20 and held.
In this case, when the insertion portion 31H of the light emitting portion 3 is attached to the concave portion 34H of the attachment end portion 20, the light emitting element of the light emitting portion 3 does not shift in position around the axial direction CL of the catheter hub 10. 32 can be aligned with the optical axis of the light L generated 32 and the axial direction CL of the catheter 12 and the catheter hub 10, and the optical axis can be positioned so as not to be misaligned during light emission.

The indwelling needle omission detecting device of the present invention is an indwelling needle holding an indwelling needle main body having a light emitting unit for generating light and a tip for indwelling the light from the light emitting unit through the inside. An assembly and a light emission driving unit that continuously emits light and / or pulses light from the light emitting unit are provided, and the light from the light emitting unit is emitted from the tip of the indwelling needle body.
As a result, light from the light emitting part is emitted from the distal end of the indwelling needle body, so that the distal end of the indwelling needle body comes out of the blood vessel during administration of liquid into the patient's blood vessel using the indwelling needle body. The operator can easily detect visually whether or not the needle main body has been pulled out. In addition, the light emission driving unit causing continuous light emission and / or pulse light emission means generating only continuous light emission, generating only pulsed light, or generating both continuous light emission and pulsed light emission.

In the indwelling needle drop detecting device of the present invention, at least a part of the indwelling needle assembly constitutes a light guide part that guides light from the light emitting part to the tip of the indwelling needle. Thereby, the light of a light emission part can be efficiently radiated | emitted from the front-end | tip of an indwelling needle, without leaking outside.
In the needle dropout detecting device for an indwelling needle according to the present invention, the light guide part is a light reflecting member that reflects light from the light emitting part. Thereby, the light of a light emission part can be efficiently radiated | emitted from the front-end | tip of an indwelling needle, without leaking outside from an indwelling needle.

In the needle drop detection device for an indwelling needle according to the present invention, the light guide is a light reflecting film formed by coating. Thereby, the light of a light emission part can be efficiently radiated | emitted from the front-end | tip of an indwelling needle, without leaking outside from an indwelling needle.
In the needle dropout detecting device for an indwelling needle according to the present invention, the light guide part is a light shielding part that shields light from the light emitting part. Thereby, the light of a light emission part can be efficiently radiated | emitted from the front-end | tip of an indwelling needle, without leaking outside from an indwelling needle.
In the indwelling needle removal device of the present invention, the light emitting unit is detachable from the indwelling needle, and the light emitting unit includes a chemical solution blocking member that prevents contact with the chemical solution. Accordingly, when the indwelling needle is disposed of, the light emitting unit can be reused, the cost can be reduced, and the chemical solution blocking member can prevent the chemical solution from adhering to the light emitting unit, so that the light emitting unit can be easily reused.

  In the needle drop detection device for an indwelling needle according to the present invention, the light from the light emitting unit has a specific wavelength having an absorption peak in a specific substance in blood. Thereby, when the tip of the indwelling needle is placed in the blood vessel, the light from the light emitting part is absorbed by the specific substance in the blood, and the intensity of the scattered light emitted from the tip of the indwelling needle is Since it is smaller than the intensity of scattered light emitted from the tip of the indwelling needle when it is off the blood vessel, it can be visually determined whether the tip of the indwelling needle is indwelled in the blood vessel or off the blood vessel.

  In the indwelling needle omission detecting device of the present invention, the light emitting unit generates light having a specific wavelength of about 660 nm having an optical absorption peak of reduced hemoglobin when the blood vessel is a vein. As a result, when the tip of the indwelling needle is placed in the blood vessel, the light from the light emitting portion is absorbed by the reduced hemoglobin in the blood, and the intensity of the scattered light emitted from the tip of the indwelling needle is Since it is smaller than the intensity of scattered light emitted from the tip of the indwelling needle when it is off the blood vessel, it can be visually determined whether the tip of the indwelling needle is indwelled in the blood vessel or off the blood vessel.

  The indwelling needle dropout detecting device of the present invention includes mode selection means that can change the light emission pulse interval of the light emitting unit and / or can selectively change the continuous light emission and the pulse light emission. As a result, in the case of an indwelling operation work in which the tip of the indwelling needle is placed in the blood vessel, the state where the light emission state from the tip of the indwelling needle is always monitored is the state in which the tip is removed from the blood vessel or the needle. It is easy for the operator to visually confirm whether or not the needle is not pulled out (the presence or absence of a needle missing state). In addition, once the tip has been placed in the blood vessel, the light emitting unit can be used to check whether the tip of the catheter is in a state where the needle has been removed from the blood vessel or has not been removed. If the optical signal is emitted in a pulsed manner (intermittently), it is easier for the operator to visually confirm the needle removal state. Note that the mode selection means can change the light emission pulse interval of the light emitting unit and / or selectively change the continuous light emission and the pulse light emission, so that the light emission pulse interval of the light emitting unit can be changed. Both the continuous light emission and the pulse light emission can be selectively changed, or both the light emission pulse interval of the light emitting unit can be changed and the continuous light emission and the pulse light emission can be selectively changed. It means to include.

By the way, this invention is not limited to the said embodiment, A various modified example is employable.
The indwelling needle omission detection device of the embodiment of the present invention shows an example in which a medical solution is instilled into a patient's blood vessel, but can also be used for other medical treatments such as artificial dialysis.
In the illustrated example, the shapes of the insertion portions 31, 31G, 31H of the light emitting portion 3 and the shapes of the insertion recesses 34, 34G, 34H of the attachment end 20 of the catheter hub 10 are other shapes such as a rectangular cross section, for example. Can be adopted. Thereby, alignment of the optical axis of the light emitting element can be maintained.

  In the example shown in FIG. 4, two convex-shaped portions 36, 36 are formed to protrude in the radial direction from the outer peripheral surface of the cylindrical portion 35, and two concave-shaped portions 38, 36 are formed on the inner peripheral surface of the concave portion 34 for insertion. 38 is formed. However, conversely, two concave portions may be formed on the outer peripheral surface of the cylindrical portion 35, and two convex portions may be formed on the inner peripheral surface of the insertion concave portion 34. Further, the number of convex portions and concave portions may be one or three or more, respectively.

Moreover, the shape of the light emitting part 3 and the attachment end part 20 of the catheter hub 10 can be formed by arbitrarily combining the embodiments shown in FIGS. 4, 6, and 7. Taps may be provided on the light emitting unit side and the indwelling needle side, and the light emitting unit side and the indwelling needle side may be fixed with a screw lock structure. The mode selection means that is electrically connected to the light emission drive unit may be configured to be able to emit light from the light emitting element of the light emitting unit in a continuous light emission (continuous light emission) and pulsed light emission. In addition, the mode selection means can continuously emit light (continuous light emission) from the light emitting element, can emit light in pulses at an arbitrary on / off interval, and / or can selectively change between continuous light emission and pulse light emission. It may be possible to make it.

FIG. 8 is a diagram illustrating an example of an embodiment of pulsed light emission by the light emission driving unit 4. In the figure, the pattern of emitting light for about 1 second and stopping light emission for about 0.5 seconds is repeated. By doing this, when there is a visual detachment from the vein (blood vessel) of the tip 12B of the indwelling needle, the light leakage intensity is large from the tip 12B of the indwelling needle. Can be easily confirmed and power consumption can be reduced.

It is a figure which shows preferable embodiment of the needle | hook omission detection apparatus of the indwelling needle of this invention. It is sectional drawing of the axial direction of the indwelling needle which shows the state in which the inner needle is inserted with respect to the indwelling needle shown in FIG. It is sectional drawing of the axial direction of the indwelling needle which shows the state from which the inner needle was removed from the indwelling needle shown in FIG. 2, and the light emission part was attached with respect to the indwelling needle so that attachment or detachment is possible. It is a perspective view which shows the structural example of the attachment edge part of a light emission part and a catheter hub. FIG. 5 (A) is a diagram showing scattered light LM generated by scattering to the peripheral region of the patient's tissue and the tissue when the tip of the catheter is not in the blood vessel. FIG. 5B is a diagram showing scattered light LP generated when red light having a wavelength of 660 nm is absorbed by red blood cells (hemoglobin) in the blood vessel when the tip of the catheter is in the blood vessel. It is a perspective view which shows another embodiment of this invention. It is a perspective view which shows another embodiment of this invention. It is a figure which shows an example of embodiment of the pulse light emission of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indwelling needle missing detection apparatus 2 Indwelling needle assembly 3 Light emission part 4 Light emission drive part 5 Control part 6 Mode selection switch (mode selection means)
10 Catheter Hub 11 Connector 12 Catheter (Indwelling Needle Body)
12B Tip of the catheter (needle tip)
13 Filter 14 Inner Needle 16 Inner Needle Hub 20 Attachment End 30 of Catheter Hub Grasping Part 31 Insertion Part 32 Light Emitting Element 35 Cylindrical Part 36 Convex Part 38 Concave Part 38P Light Transmission Member 100 Blood Vessel 200 Chemical Solution Bag 201 Tube W Chemical Solution CL Axial direction

Claims (10)

An indwelling needle assembly holding an indwelling needle body having a light emitting unit for generating light, and a tip for indwelling the light from the light emitting unit in a blood vessel;
A light emission driving unit that continuously emits light and / or pulses light from the light emitting unit,
An indwelling needle omission detection device characterized in that the light from the light emitting part is emitted from the tip of the indwelling needle body.   2. The indwelling needle according to claim 1, wherein at least a part of the indwelling needle assembly constitutes a light guide portion that guides the light from the light emitting portion to the distal end of the indwelling needle body. Needle drop detection device.   The indwelling needle omission detection device according to claim 2, wherein the light guiding unit is a light reflecting member that reflects the light from the light emitting unit.   The indwelling needle removal device according to claim 2, wherein the light guide portion is a light reflecting film formed by coating.   The indwelling needle omission detection device according to claim 2, wherein the light guide unit is a light shielding unit that shields the light from the light emitting unit.   The said light emission part is detachable with respect to the said indwelling needle assembly, and the said light emission part has a chemical | medical solution blocking member which blocks | prevents contact with the said chemical | medical solution. The indwelling needle omission detection device according to one of the items.   The indwelling needle omission detection according to any one of claims 1 to 6, wherein the light from the light emitting unit has a specific wavelength having an absorption peak in a specific substance in blood. apparatus.   8. The indwelling needle according to claim 7, wherein when the blood vessel is a vein, the light-emitting unit generates light having a wavelength of about 660 nm, which is an optical absorption peak of reduced hemoglobin, near the specific wavelength. Missing detection device.   2. The light emission drive unit includes a mode selection unit that can change a light emission pulse interval of the light emission unit and / or can selectively change the continuous light emission and the pulse light emission. The needle dropout detecting device for an indwelling needle according to any one of claims 8 to 9. A substantially cylindrical catheter hub as a casing member;
A catheter as an indwelling needle body held at one end of the catheter hub;
An inner needle inserted into the catheter and the catheter hub;
Provided on the catheter hub, and having a connection part for connecting an infusion tube,
The indwelling needle assembly is characterized in that a light emitting part is provided at the other end of the catheter hub, and light from the light emitting part is emitted from the tip of the indwelling needle body.

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