DE102009004018A1 - Venous needle passing detector for dialysis machine, for analyzing correct fitting of medical needle and/or cannula in artery or vein of patient, has detecting device for detecting dampness in proximity of needle and/or cannula in patient - Google Patents

Abstract

The detector has a detecting device for detecting dampness i.e. fluidity, in proximity of a medical needle and/or a cannula in a patient. A bandage i.e. plaster (1), arranges the medical needle at the patient, where the detecting device is arranged in or on the bandage. A signaling device is connected with the detecting device and delivers a signal, when the detecting device detects the dampness and/or the fluidity. The signaling device has a communications device that transmits the signal to a medical device. An independent claim is also included for a method for analyzing correct fitting of a medical needle and/or a cannula in a patient.

Description

The The present invention relates to a monitoring device the correct fit of a medical needle or cannula on a patient with a device for detecting moisture, In particular liquid, in an environment of the needle or Cannula on the patient.

A Dialysis machine in medical technology is generally used for control and monitoring of dialysis. She pumps the blood and that Dialysate, measures the rate of dialysis, monitors the temperature of the liquid and the correct composition the rinse solution, detects leaks and air bubbles in the blood tubes. During dialysis access takes place the fluid to a patient in general a catheter for insertion in body organs or a cannula or needle for puncturing vessels. Therefore, it is necessary to have a proper Access to the patient during the examination or treatment sure. Sometimes dialysis takes several hours and hours It may happen that the needle or cannula unintentionally was pulled, leaving the puncture sites of the vessels exposed, leading to a bleeding of the patient could, if the dialysis machine does not recognize this. Therefore It is necessary to have a correct seating position of the needle or cannula to monitor.

in the The prior art filters of different devices are known, which in general is based on monitoring the pressure in the extracorporeal Based on blood circulation. In practice, however, it has been shown that the sole monitoring of the pressure in the extracorporeal blood circulation slipping out, in particular, of the venous puncture cannula not enough security guaranteed.

DE 10 2006 011 313 B3 describes a device and a method with which the access to a patient, in particular the vascular access in an extracorporeal blood treatment can be monitored. The device monitors access to a patient for a device that delivers fluid to the patient via a tubing or drains it from the patient. The pressure in the hose line is monitored. For example, if the diameter of the tubing changed, a kink in the tubing eventually results, which results in an increase in the pressure in the tubing that can be monitored by a pressure monitor. If the pressure exceeds a predetermined threshold, then it is concluded that the puncture cannula threatens to be withdrawn from the vessel or partially slipped out, and the limits for pre-alarms and alarms may be set.

These Procedure requires a complicated handling, in particular, After use, the hose should first with the needle and then carefully with the cleaning fluid How to clean salt water to ensure proper pressure monitoring guaranteed at a reuse of the hose to be able to.

About that In addition, the above procedure in terms On the reliability also wishes open. The Detection of the needle pull according to the above procedure is based on a Change in pressure in the hose line. The device would So do not trigger an alarm if only the plaster, with the needle attached to the skin of the patient, pulled will, as the pressure in the tubing in the absence of patch not changed. The device would not work either Trigger an alarm when the needle is no longer in the blood vessel, but put it somewhere else (eg in a pillow), because here, too, the pressure in the hose line unchanged stay. In addition, the device can trigger a false alarm, if z. B. the hose is only slightly kinked, but what does not lead to a significant disorder of dialysis, because the pressure in a kinked state of the hose changed.

Of the The present invention is therefore based on the object, an improved Device and an improved method for testing the to provide the correct fit of a medical needle or cannula.

Preferably the invention provides an easy-to-use, reliable, adjustable and compatible with existing medical facilities Device ready for safe monitoring of the punctual access guaranteed.

These Task is with the features according to the claims solved.

The The present invention relates to a method and an apparatus for checking the correct fit of a medical needle or cannula on a patient with a device for Detecting moisture, especially liquid in an environment of the needle or cannula on the patient.

Prefers The device further comprises a dressing for placing the medical Needle or cannula on the patient, wherein the detection device in which or on the bandage is connected; and a signaling device, which is connected to the detection device, and a signal emits when the detection device moisture, in particular Liquid, detected.

Prefers the dressing is in the form of a plaster which forms the can replace conventional patches during treatment. The signal device preferably also has a communication device which transmits the signal to other medical devices. The communication device can serve over a fixed Connect or signal wirelessly to existing medical display devices and / or alarm devices. Preferably the device further comprises: a first and a second electrical Ladder, which are spaced apart such that there is a first resistance between them and being present moisture, especially liquid, in the dressing a second resistor is present, which is smaller than the first resistor. Preferably, the second resistance is considerably smaller than the first, and more preferably, it goes against or is about 0 Ω.

The Apparatus may further comprise a support which is liquid absorbent and is placed on the bandage. In the presence of moisture or liquid can be the liquid absorbent pad Absorb liquid and thereby the two electrical Squeeze ladder.

Preferably may be the first and the second electrical conductor extend through the overlay.

The Overlay can absorb moisture or liquid and thereby squeezing the first and second electrical conductors, so that the second resistance between the two electrical conductors is present.

Of the The first resistance essentially corresponds to the resistance of one electrical insulator and the second resistor essentially corresponds the resistance of an electrical conductor. It means that the first electrical conductor in unused condition of the bandage has a distance to the second electrical conductor. As soon as Liquid, for example blood and / or rinsing solution, located between the first and second electrical conductors, the two electrical conductors are compressed, so that an electric current can flow between them. Electricity is so low that it is human Body is not harmful. The signaling device can trigger an alarm as soon as the current between the first and second electrical conductors flows.

Preferably are the first and the second electrical conductor with the signaling device connected and the detection device outputs a signal when between the first and second electrical conductors, a second Resistance is present.

Prefers are the first and the second electrical conductor in the edition arranged one below the other. As an alternative, the two can electrical conductor in the support also arranged side by side be. Preferably, the first and second electrical conductors are outside the overlay of the bandage insulated with an insulating layer.

Prefers For example, a lower side of the bandage is suitable for a bandage to provide in contact with the skin of a patient.

To In other aspects of the present invention, the device further comprising: an electrically conductive pad, the outside the circulation of the federation on the lower side the association is arranged; and a third and fourth electrical Ladder between the lower sides of the bandage and the electric conductive pad are arranged spaced from each other; wherein between the third and fourth conductors of the second resistor is present. The electrically conductive support can be provided in this way be that they have a higher Adhäsionsfähigkeit on their lower side as on their side, with the bottom side of the conductive pad is in contact with the skin of the patient when the bandage is on the patient's skin is attached, and the upper side the conductive overlay adheres to the lower side of the Association.

Prefers is between the third and fourth conductor of the first resistor when the electrically conductive pad is removed. That is, in the unused or normal state of the bandage can be a small electric current between the third and fourth Ladder flow. If the bandage but its original attached position on the skin of the patient leaves, the conductive pad remains on the skin of the patient and communicates with the third and fourth electrical conductors and the Association no longer in contact. This will be the electrical contact interrupted between the third and fourth conductor, so that the Electricity can no longer flow between them. The signaling device can also trigger an alarm in this situation.

Of the third and fourth conductors can also be connected to the signaling device be connected, d. h., if between them a first resistance is present, the detection device can emit a signal.

Prefers are the first, second, third and fourth ladder in the form of an elongated and flat metal formed and extend through the entire Bandage on the bottom side.

The present invention is a simple construction of a venous needle-pull detector, which can serve to ensure that the needle pull the venous and arterial needle from the shunt of the patient gives a signal. In the case of the venous or arterial needle type detector, when the patch is detached and the needle is pulled, the machine's blood pump is stopped to prevent the patient from bleeding to death. The device of the present invention may trigger an alarm to inform the staff that the patient is suffering from blood loss.

The Device, d. H. a venous needle pull detector, is for the dialysis machine an external alarm, the on the shunt the shunt puncture site can be attached.

The Device according to the present invention can not only for monitoring the venous or arterial needle during a Dialysis serve, but also as an alarm for more Devices in the medical field (eg a catheter needle in an intensive care unit).

advantageous Embodiments of the invention are exemplified in FIG represented the figures. Show it:

1 a schematic plan view of the dressing according to a preferred embodiment of the present invention; and

2 a schematic side view of the dressing according to a preferred embodiment of the present invention.

Based of the drawings will be hereinafter an embodiment of the present invention.

1 and 2 show an exemplary embodiment of the present invention. The device has a detection device and a liquid-receptive support 2 and can serve as an alarm detector for monitoring during dialysis. The overlay or suction pad 2 is on the lower side of the bandage or plaster 1 appropriate. The two electrical conductors three . 4 are in the edition 2 spaced apart or side by side and extend along the lower side of the patch 1 , One end of each electrical conductor can each be connected to a connection element 5 . 6 get connected. The device according to the invention may preferably comprise a further electrically conductive support 9 also on the lower side of the patch 1 is arranged. Between the edition 9 and the plaster 1 are two more electrical conductors 10 and 11 spaced apart and extend along the lower side of the pavement 1 up to the connection elements 7 and 8th , The adhesion of the lower side of the electrically conductive pad 9 is greater than the adhesion of the upper side. Therefore, the electrically conductive pad remains 9 adhering to the skin of a patient when the plaster 1 is removed from the skin. This will cause the circuit between the electrical conductors 10 and 11 interrupted because the electrically conductive pad 9 no longer lies between them.

Furthermore, the device according to the present invention comprises a signaling device with a communication device as well as an alarm signaling cable or a wireless LAN adapter or a Bluetooth module connected to the electronic connection elements 5 . 6 . 7 and 8th be connected. The signaling device can forward a signal to other existing medical devices and / or trigger the pump stop. This alarm message can be transmitted through a cable or wirelessly (eg via wireless LAN or Bluetooth). An exemplary approach to monitoring the correct seating of the medical needle or cannula will be described below.

The patch 1 can be applied to the skin and comes through the needle or the puncture site with the absorbent pad in contact. The device of the present invention may be sterilized and packaged sterile so that it can be used for medical use. The device holds the needle in the shunt and can be attached to the arterial needle or venous needle at the puncture site. Therefore, the device is not directly on the patient's artery or vein. This is the name of the access or departure of the blood from the venous or arterial puncture site.

If the needle is pulled, ie, the correct sitting position leaves, the puncture sites of the blood vessel is exposed. The edition 2 is able to absorb blood. In the absorbent pad 2 , z. B. a Saugkompresse with the metal conductors three and 4 there is a small airspace. The absorbent pad may also be provided of a thinly pressed sponge that quickly sucks blood or liquid and the metal conductors three and 4 compressed so that an electronic current can flow through them. The detection device detects the state of the needle and the communication device transmits the alarm to desired devices. An alarm or a signal can be triggered with the signaling device. The signal may be used to stop the blood pumps of the dialysis machine and / or to inform the medical staff. Consequently, bleeding of the patient can be prevented.

Even if the needle is still in the blood vessel but the patch has already been pulled, it can lead to a disorder of dialysis and / or blood loss. That is, even only when loosening or pulling the plaster 1 should also be triggered an alarm. This may be due to the electrically conductive pad 9 and the electrical conductors 10 and 11 be monitored. As the adhesion of the lower side of the electrically conductive pad 9 greater than the adhesion of the upper side, is when removing the plaster 1 from the skin the electrically conductive pad 9 stay on the skin of a patient. This will cause the circuit between the electrical conductors 10 and 11 interrupted because the electrically conductive pad 9 no longer lies between them. In this case, the signaling device can also trigger a signal, which informs the staff about the condition of the patch and / or which automatically stops the blood pumping. That is, the device of the present invention also monitors the condition of the patch in addition to the correct seating position of the needle 1 ,

Of the Bandage can be between 20 cm and 2 cm long and between 1 to 10 cm wide, preferably between 8 cm and 16 cm long and between 1 to 3 cm wide and more preferably, for example 12 cm long and be 2.5 cm wide. The circulation of the association, d. H. the suction pad can be 3 cm long and 1.8 cm wide and can be made with metal ladder be provided. Within the suction pad is a small white space, in which the metal conductors at a distance of for example 2 to 3 mm from each other. The metal conductor can be 1 mm thin and up to the adapter port or through the whole bandage extend. The electrically conductive support or Pflasterzugmelder For example, between 1 to 4 cm long and between 0.2 to 1 cm wide, preferably between 2 to 3 cm long and between 0.3 to 0.7 cm wide. The size information can however, vary as needed.

elder Dialysis machines have no alarm and therefore it can Occur that the blood pumps continue because the venous Needle reports a resistance, z. B. when the needle in the Mattress of the patient bed or the like entangled. in this connection the blood pumps are not stopped, leading to bleeding of the blood Patients can lead. The inventive Needle tension detector in this case can be attached to the artery or vein of the Patients are placed in it after puncturing the shunt needles is glued to the Shunteinstichstelle. Thus he prevents one unnecessary blood loss of the patient.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102006011313 B3 [0004]

Claims (20)

Device for checking the correct Seat of a medical needle or cannula on a patient with a device for detecting moisture, preferably Liquid in an environment of the needle or cannula on the patient. The device of claim 1, wherein the device further comprising: a bandage for placing the medical Needle or cannula on the patient, wherein the detection device is arranged in or on the bandage; a signaling device, which is connected to the detection device and emits a signal, when the detection device detects moisture or liquid. The device of claim 2, wherein the dressing comprises Pavement is. Device according to one of the preceding claims, wherein the signaling device further comprises a communication device which transmits the signal to another medical device. Device according to one of the preceding claims, the device further comprising: a first and a second electrical conductor arranged so spaced from each other are that there is a first resistance between them and when Presence of moisture or liquid in the dressing a second resistor is present, which is smaller than the first resistor is. The device of claim 5, wherein the first resistor substantially corresponds to the resistance of an electrical insulator; and wherein the second resistance is substantially equal to the resistance of a electrical conductor corresponds. Device according to one of the preceding claims, the device further comprising a support which is liquid-absorbent and is placed on the bandage. Apparatus according to claim 7, wherein the first and the second electrical conductor extending through the support. The device of claim 8, wherein the overlay is moisture or liquid sucks and thereby the first and the second electrical conductor compresses, leaving the second There is resistance between them. Device according to one of claims 6-9, wherein the first and second conductors are connected to the signaling device are; and wherein the detection device outputs a signal when between the first and second conductors a second resistor is present. Apparatus according to any one of claims 6-10, wherein the first and the second conductor arranged in the support with each other are. Apparatus according to any one of claims 6-10, wherein the first and second conductors are arranged side by side in the support are. Apparatus according to any of claims 6-12, wherein the first and the second conductor outside the circulation of the Association are insulated with each other with an insulating layer. Device according to one of claims 2-13, wherein a lower side of the dressing is suitable, an adhesive To provide contact with the skin of a patient. Apparatus according to any of claims 6-14, wherein the device further comprising: an electrically conductive Edition, outside the edition of the Association on the lower side of the dressing is arranged; and a third and a fourth electrical conductor between the lower Side of the bandage and the electrically conductive pad are arranged objected; being between the third and the fourth conductor is the second resistor. Apparatus according to any one of claims 15, wherein between the third and the fourth conductor the first resistor is present if the electrically conductive support is not Will get removed. Apparatus according to any one of claims 16, wherein the third and fourth conductors are connected to the signaling device are; and wherein the detection device outputs a signal when between the third and fourth conductors a first resistor is present. Device according to one of claims 15-17, wherein the first, second, third and fourth conductor in the form of a elongated flat metal conductors are formed. Device according to one of claims 15-18, wherein the first, second, third and fourth conductor through the entire bandage on the lower side. Method, in particular with a device according to at least one of the preceding claims, for checking the correct seating of a medical needle or cannula on a patient with the step of detecting moisture, preferably liquid in an environment of the needle or cannula of the patient.