WO1999053835A1 - Vorrichtung und verfahren zur intravasalen druckmessung und kontaminationsarmen einlage von kathetern z.b. in blutgefässe - Google Patents
Vorrichtung und verfahren zur intravasalen druckmessung und kontaminationsarmen einlage von kathetern z.b. in blutgefässe Download PDFInfo
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- WO1999053835A1 WO1999053835A1 PCT/EP1999/002689 EP9902689W WO9953835A1 WO 1999053835 A1 WO1999053835 A1 WO 1999053835A1 EP 9902689 W EP9902689 W EP 9902689W WO 9953835 A1 WO9953835 A1 WO 9953835A1
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- Prior art keywords
- measuring device
- pressure measuring
- pressure
- measuring channel
- container
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/18—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements using liquid as the pressure-sensitive medium, e.g. liquid-column gauges
- G01L7/20—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements using liquid as the pressure-sensitive medium, e.g. liquid-column gauges involving a closed chamber above the liquid level, the chamber being exhausted or housing low-pressure gas; Liquid barometers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
Definitions
- Central venoses i.e. catheters inserted into large veins near the heart, are used to measure certain hamodynamic sizes and for the continuous or discontinuous application of medications or infusion solutions and are an important part of monitoring and (in-depth) medical care for patients. Puncturing veins near the heart requires skill and experience and knowledge of the anatomical conditions ahead In addition to the variability of the location of veins close to the heart, particularly difficult puncture conditions repeatedly lead to incorrect punctures of adjacent arteries
- 40 - 60 mm Hg is physiological, in the veins close to the heart, on the other hand, a mean pressure of 7 - 10 mm Hg with an amplitude of only a few mm Hg. Under pathological conditions, the pressure difference between arteries and veins and also the pressure amplitude in the vessels can become both larger and smaller.
- the arterial blood Due to the higher oxygen content, the arterial blood is usually lighter than the venous. Lung or heart diseases can, however, lead to the arterial blood also appearing comparatively dark; with ventilation with pure oxygen, e.g. when the anesthetic is initiated, however, the venous blood is also quite light. The color of the blood is therefore a poor criterion.
- a reliable way to differentiate arterial and venous blood is a blood gas analysis, in which the oxygen and carbon dioxide partial pressure is measured. This is time-consuming and personnel-intensive and therefore expensive.
- the blood pressure in the punctured vessel can also be measured directly using a riser. If you let the blood run back into the line, the transfer of several milliliters of blood into the riser takes some time, depending on the - 3 -
- a so-called transducer system one not only records the mean blood pressure, as with a riser, but also the blood pressure amplitude in the punctured vessel. Since the insertion of catheters requires sterile cauldrons, one must inevitably prepare the pressure transducer system for this technique. This is very time consuming and also requires a "third hand", in which you can give the cable connection for connection to the monitor.
- pre-puncture is often avoided in clinical practice. Unintentional arterial punctures are then only recognized after the catheter has been inserted by intravascular pressure measurement or by the blood rising in the infusion system and / or by an X-ray of the thorax.
- a closed system for example for pressure-controlled handling of a fluid, is known from the applicant's DE 195 03 230.
- So-called side-port cannulas are available on the market. These have an additional, laterally located channel closed by a valve mechanism, through which a guide wire can be inserted after puncturing the vessel, via which then the catheter is pushed into the vessel; so-called “Seldinger technology”.
- a syringe from US Pat. No. 4,813,938, hereinafter referred to as "Raulerson syringe” is known with a through channel in the piston which is closed by a valve mechanism and through which a guide wire can be inserted into the punctured vessel without the syringe having to be disconnected .
- the object of the present invention is to provide a compact, easy-to-use device which can measure the pressure in a cavity, in particular allows a precise and reliable differentiation of veins and veins by means of a cannula, the device being a controlled, unnecessary one Injury-avoiding insertion of a catheter or the like is permitted, in particular to the exclusion of blood contamination of the person operating the device.
- a first embodiment of the invention is a one-person-operated, sterilizable, medical pressure measuring device which has at least one cannula connection, one measuring channel and one access and the measuring channel opens into a closed container with rigid walls, in which a compressible medium is located.
- a liquid does not rise against gravity in an open container, e.g. a riser, as in the known solution, but penetrates into a closed, for example air-filled container with a given volume and non-elastic walls and compresses the air in the process successively.
- This calculation can be used to assign a certain pressure to a certain liquid level in this container and thus calibrate a scale on which the pressure of the compressed air can be read directly with the liquid column as a pointer.
- the hydrostatic pressure of the liquid column which also includes the specific weight of the liquid
- the pressure under which the liquid is located can also be specified. If the liquid is e.g. For "physiological" saline with a specific weight of approx. 1, the error resulting from a liquid column of a few centimeters can be neglected for the measurement of arterial blood pressure.
- a handy pressure measuring device that is also suitable for measuring central venous and arterial mean pressures has connected the measuring channel upstream of the measuring channel with likewise predetermined volume and non-elastic walls for the complete absorption of the rising liquid, which is either outside or inside the container.
- the quotient of the air volume in the measuring channel to the total air volume in the measuring channel and container results in the measuring range over which the pressure at the liquid level in the measuring channel can be read comparatively accurately: for example, on a 1 ml measuring channel
- Pressure measuring device with a total air volume of 6 ml overpressures from 0 to about 150 mm Hg can be read and thus also the pathologically elevated arterial mean pressures of a patient with high blood pressure.
- a smaller ratio between the air volume in the measuring channel and the total air volume in the measuring channel and container increases the measuring range, but worsens the reading accuracy.
- the pressure measuring device can be arranged in such a way that the measuring channel runs horizontally and thus the hydrostatic pressure of the liquid column no longer causes a measuring error.
- such a pressure measuring device measures more precisely with only a small compression of the air volume contained in it than with a stronger compression.
- a measuring channel with different cross sections (with a smaller cross section near the cannula and larger cross section towards the container) makes it very easy to further improve the measuring accuracy for low pressures.
- the pressure measuring device described above is now installed between the cannula and the syringe before the puncture begins.
- Blood pressure can be measured either by allowing blood to enter the measuring channel through the blood pressure in the punctured vessel or by passing through
- the contamination problem is solved in that the cannula, e.g. by means of a three-way cock, and is only opened again for advancing the guidewire for a catheter or the catheter itself.
- the pressure measuring device described can also advantageously be used on so-called side-port cannulas, as described above.
- the approach of the pressure measuring device only has to be designed in such a way that the valve mechanism located there is overcome by plugging onto the side port and closes again after disconnection (so that the guidewire can then be inserted with low contamination). It should be noted that there is usually some air in the side port of these cannulas, which can lead to an incorrectly low pressure display when measuring pressure, provided this additional air volume is not taken into account when calibrating the scale of the pressure measuring device.
- the syringe described in the above-mentioned DE 195 03 230, the disclosure of which is fully referred to in this regard, is also suitable for measuring blood pressure by means of small-lumen cannulas.
- the container and the measuring channel located in this container are accommodated in the piston of the syringe.
- An advantage of this syringe is that a pressure measuring device of this syringe is always calibrated against the ambient air pressure, so-called “zeroed", when the syringe barrel is vented, and remains calibrated, since the air in the pressure measuring device of the syringe only contains the likewise room-temperature-controlled liquid, for example saline solution.
- the syringe allows the entire "measuring leg" to be rinsed out of the syringe barrel by injecting liquid, for example saline. At the same time, liquid is pressed into the measuring channel. Since the friction of the sealing lip always keeps the plunger in its position in the syringe barrel even when the injecting finger is completely relieved, the syringe now injects with decompression of the air in the plunger until the pressure corresponds to the vessel pressure. Since the cannula is rinsed continuously, clotting blood cannot clog the cannula and the vessel wall is always pushed away from the cannula.
- liquid for example saline
- the (medium) pressure of central veins can be exactly be measured. Due to the magnifying effect of the thick channel wall, the liquid level or the scale in this area can be easily recognized even when the plunger is inserted into the syringe barrel.
- the higher, arterial (mean) pressures are measured in the rear, short and large-lumen section of the measuring channel, albeit somewhat less precisely. Since this area of the plunger protrudes from the syringe barrel, the liquid level can always be read easily here.
- the measuring channel can also be continuously enlarged from the inside diameter.
- a closure piece with which the piston air volume communicating with the syringe barrel can optionally be reduced or increased e.g. with a closure piece which can be displaced in the piston and which either has the rear opening of the measuring channel or even parts of the measuring channel are closed.
- a screw mechanism or a bayonet lock always holds the closure piece in the specific position in the piston, thus ensuring the pressure measurement accuracy.
- a pressure measuring device can also be used to measure negative pressures on a correspondingly calibrated scale, for example the by aspiration, ie by pulling back the plunger in the syringe barrel: after drawing up the liquid in the syringe barrel, the plunger is opened against the atmospheric pressure, for example by a slide or two openings in the wall of the plunger and the closure piece which can be rotated relative to one another. After having closed the outlet opening of the syringe barrel by advancing the plunger, - 10 -
- a system with a syringe is described below, with which not only can be aspirated, but also the pressure in the punctured vessel or fluid space can be measured, and by means of which a guide wire for a catheter or a catheter, e.g. can slide into a blood vessel without the need to disconnect the syringe from the cannula.
- the syringe has a syringe cylinder and a hollow piston with a damping and pressure measuring device corresponding to the "Enk syringe".
- the piston has a breech at the rear with a through bore which is actuated by a sliding or rotating mechanism or a e.g. from the valve mechanism known from the "Raulerson syringe", can be closed or opened and by means of e.g. a guide wire for a catheter or a catheter can be advanced into the channel of the pressure measuring device. If the channel additionally has at least a sufficiently large lateral opening, the channel of the pressure measuring device can also be received by the closure piece in the sense of centering.
- this syringe By pulling back the plunger, this syringe also has a "damped" vacuum in the syringe barrel, compared to a normal syringe, through which liquid, e.g. Saline solution, against which gravity can draw up or up in the syringe barrel.
- liquid e.g. Saline solution
- the syringe must be held down with its cannula tip and there should be some air in the syringe barrel, approx. 1 ml. Otherwise, liquid can penetrate into the channel due to the negative pressure that also arises in the piston, particularly in the case of strong aspiration.
- the syringe is now vented conventionally, i.e. held up with the cannula attachment and the air pushed out of the syringe barrel by advancing the plunger.
- the liquid closes the front opening of the channel. Even with a channel opening of three millimeters, the surface tension of the liquid prevents liquid from entering the channel by gravity.
- the liquid in the syringe barrel acts as a very effective buffer. This prevents the blood-liquid mixture from being sucked directly into the channel, and thus the pressure measuring device, even with strong aspiration Losing their calibration
- the blood is immediately diluted by the liquid and therefore cannot coagulate in the syringe.Mixing the room-temperature liquid with the body-warm blood also leads to a slight warming over time and thus expansion of the air. But since the blood pressure now is measured directly, the resulting measurement error (false low values) is negligibly small even in view of the pressure difference to be recorded between veins and arteries
- the plunger For the blood pressure measurement in the punctured vessel, the plunger is now slightly advanced.This injects the blood-liquid mixture in part and in part prints it into the canal.Due to the sufficiently high friction of the sealing lip, the plunger always holds its position in the syringe barrel, even if the When the pushing finger completely relieves the piston, the blood pressure of the punctured vessel can be read, for example on a calibrated scale located in or on the piston, as soon as the liquid level in the channel no longer moves
- the plunger is pushed fully into the syringe barrel and then the guide wire for the catheter or the catheter is pushed through the closure piece, the measuring channel, the cannula attachment of the syringe barrel and the attached cannula into the blood vessel.
- the blood-liquid mixture is injected. If the measuring channel is accidentally “sprayed” by very rapid injection, the blood-liquid mixture drips into the cavity of the piston and is "encapsulated” there. Contamination of the work area is avoided.
- an overpressure can build up in the plunger through which air from the plunger can enter the syringe barrel and can be injected if you are not careful, you should avoid "over-splashing" the channel.
- the injection of the blood-liquid mixture does not pose any risk to the patient: contact with foreign surfaces may activate the coagulation of the aspirated blood.
- the coagulation factors are immediately greatly diluted by the liquid in the syringe barrel. The blood cannot "clot” and you will never inject blood clots.
- Pistons are permanently lost and there is a risk of inadvertently injecting the air that has entered the syringe barrel. Liquid is then also sucked into the measuring channel due to the negative pressure created in the piston and the pressure measuring device is thus incorrectly calibrated
- the measuring channel can be closed before aspiration by turning the piston against the sealing lip. Only for pressure measurement and the subsequent insertion of a guide wire or catheter is the piston rotated again so that an in the opening located with the sealing lip comes to coincide with the measuring channel - 15 -
- a turning of the sealing lip can easily be prevented by a wall thickening, for example a bar, on the inner wall of the syringe barrel and a corresponding recess in the sealing lip.
- the wall thickening which acts like a magnifying glass, improves the visibility of the pressure display, which is not the case with a measuring channel located centrally in the piston must be read by three but possibly only by two plastic layers
- the correct rotational position of the piston for the closure or the opening of the pressure measuring device is easy to grasp by means of two opposing spherical thickenings of the sealing lip.
- the double seal "snapping" into the lumen of the measuring channel reliably seals off the air volume in the piston during aspiration.
- the air of the pressure measuring device can so even with, in this case "undamped", strong aspiration, do not escape from the flask
- An airtight seal of the pressure measuring device can also be achieved by means of a circular sealing lip of variable depth, which lies in a circular groove of the piston with a likewise variable depth.
- the sealing lip is more or less squeezed together and thereby an opening in the sealing lip optionally opened or closed
- the friction of the sealing lip can also be changed as desired
- a comparable mechanism in the closure piece of the plunger serves to open the plunger after the pressure measurement has taken place for the insertion of the guide wire or catheter - 16 -
- the bore in the closure piece should not form a continuous connection with the measurement channel:
- a gap between the measurement channel and the closure piece does not interfere with the advancement of the guide wire or the catheter.
- it is crucial for the correct functioning of the pressure measuring device and, like a lateral opening ensures that even after arterial puncture, when the bore in the closure piece is opened, blood may drip from the measuring channel into the cavity of the piston.
- a valve mechanism that is more complex in terms of construction and production technology and thus expensive prevents blood from escaping from the syringe.
- this syringe can also be used "from bottom to top", as is often the case with punctures of the subclavian vein.
- this syringe is "undamped” as with a conventional syringe.
- the plunger After ensuring the correct position of the cannula by means of blood pressure measurement, the plunger is again pushed fully into the syringe cylinder so that the guide wire or catheter can subsequently be pushed through the syringe into the blood vessel. If you want to avoid injecting the blood-liquid mixture completely, you can do this before pushing the plunger forward - 17 -
- a further possibility of switching off the pressure measuring device of the syringe during aspiration is provided by a stylet which tightly closes the front opening of the measuring channel.
- This stylet is only withdrawn from the measuring channel when you want to measure pressure or inserted again when you want to aspirate again.
- This solution requires a valve mechanism in the closure piece.
- the front opening of the measuring channel should have a smaller cross-section than the measuring channel itself, otherwise the stylet in the measuring channel can act like a piston and suck liquid into the measuring channel when it is pulled back.
- a retraction of the stylet leads to a calibration error:
- the volume of the stylet is suddenly missing and causes a minimal vacuum in the pressure measuring device with the result of an incorrectly high pressure display.
- the calibration error can be neglected if the stylet has a correspondingly small volume or can be taken into account from the start when calibrating the scale.
- the calibration error can also be minimized as follows if the valve mechanism is suitably designed in the piston plug: If the valve mechanism functions lifted for a short moment when the stylet is pulled out, the pressure of the air in the pressure measuring device adjusts to the ambient air pressure ("zeroing"). It should be noted that if the valve function is undone for too long due to the blood-liquid mixture penetrating into the measuring channel, too much air from the pressure measurement - 18 -
- a larger problem with regard to incorrect calibration of the pressure measuring device is the suction of air when the cannula is not inserted airtight on the cannula attachment (incorrectly low pressure display).
- the syringe must be deaerated every time in such a case.
- FIG. 1 shows a first pressure measuring device with a container and a measuring channel
- Fig. 2 shows a second pressure gauge with one inside the container
- FIG. 3 a third pressure measuring device with a horizontal measuring channel
- FIG. 4 a fourth pressure measuring device with a continuously expanding measuring channel
- FIG. 5 shows a fifth pressure measuring device with a graduated measuring channel
- FIG. 6 shows a system with a sixth pressure measuring device and a cannula
- FIG. 7 shows a second system with a seventh pressure measuring device as well as a cannula and a syringe
- FIG. 8 shows a pressure measuring device integrated in a syringe , - 19 -
- FIG. 9 shows a system consisting of a pressure measuring device integrated in a syringe, connected to a side-port cannula, FIG. 10 shows another syringe with integrated pressure measuring device, FIG. 11 shows a container of the pressure measuring device, which is closed with a closure piece,
- Fig. 13 is a valve attached to a valve for venting the
- FIG. 14 a closure piece which can be displaced in the container
- Fig. 15 a further displaceable closure piece
- Fig. 16 a tongue and groove system as a pressure protection
- Fig. 17 a conical funnel shape of a bottom facing a cylinder space of a syringe
- Fig. 18 an eccentrically arranged measuring channel in a Syringe
- FIG. 19 shows a cross section through a syringe with an integrated pressure measuring device, a seal being arranged such that it cannot rotate against the cylinder wall of the syringe
- FIG. 20 is a plan view of a further seal corresponding to that from FIG. 19,
- FIG. 21 shows a cross section through the seal Fig. 20,
- Fig. 22 is a schematic view of a syringe with an eccentric
- FIG. 23 a further seal that can be used, for example, in a syringe according to FIG. 22, FIG. 24 a closure piece with a rotating part, FIG. 25 a schematic view of a container of a pressure measuring device with a spaced closure piece, FIG. 26 a schematic View of a container of a pressure measuring device with the locking piece engaged, FIG. 27 shows a further schematic view of a container of a pressure measuring device with a sealing plug arranged in the measuring channel and
- a first pressure measuring device 1 shows a first pressure measuring device 1 with a closed container 2.
- a compressible medium 3 In the container 2 there is a compressible medium 3.
- a measuring channel 4 opens into the container 2. This is, for example, at least partially filled with a saline solution 5.
- the measuring channel 4 serves as a riser.
- a visible level of the saline solution 5 or of blood indicates the pressure present.
- the container 2 shows a second pressure measuring device 6 with a measuring channel 4 located at least partially in the interior of the container 2.
- the pressure measuring device becomes extremely compact and is even more convenient for the operator to hold. This contributes to the fact that the container 2 has rigid walls 7, which can also be anatomically adapted to a handle shape.
- FIG. 3 shows a third pressure measuring device 8 with a measuring channel 4 arranged at least partly horizontally.
- a horizontal section 9 of the measuring channel 4 in the container 2 prevents the pressure measurement result from being falsified due to the weight of blood or, for example, the saline solution in the measuring channel 4.
- An advantageous maximum diameter 10 of the measuring channel 4 in the horizontal section 9 is not more than 4 mm. This maximum diameter 10 is to be arranged in the usable measuring channel 4, which means that where a blood pressure measurement is also to be expected with a level display of the blood or the saline solution in the measuring channel 4.
- Fig. 4 shows a fourth pressure measuring device 11.
- the measuring channel 4 expands in its
- Such a measuring channel 4 allows the container 2 to be dimensioned in such a way that it can be held by one hand of the operator.
- the measuring channel 4 has a first 13 and a second 14 stage. These are in particular arranged so that in known
- a shape of the first 13 or second 14 step can, as shown, be conical or also in the form of a landing. Similar to the previous FIG. 4, FIG. 5 shows that a first diameter 15 of the measuring channel 4 is larger than a second diameter 16 of the measuring channel 4. The first diameter 15 is arranged closer to a mouth 17 of the measuring channel 4 in the container 2 than the second
- FIG. 5 shows that a first section 18 of the measuring channel 4 with a third diameter 19 is arranged outside the container 2, while a second section 20 of the measuring channel 4 is located inside the container 2, the third diameter 19 in first section 18 is smaller than a fourth diameter 21 of measuring channel 4 in second section 20.
- FIG. 6 shows a first system 22 with a sixth pressure measuring device 23 and a cannula 24.
- the cannula 24 can be connected to a cannula connection 26 of the sixth pressure measuring device 23.
- the measuring channel 4 is arranged in the container 2 such that the measuring channel 4 runs in the longitudinal axis of the connected cannula 24.
- the container 2 has an access 27, preferably opposite the cannula connection 26, with a first valve 28 which closes an opening 29 of the container 2.
- the compressible medium in the container 2 is retained by the first valve 28 in the sixth pressure measuring device 23.
- a catheter (not shown here) is to be introduced into a blood vessel, the correct position of the cannula 24 can first be secured by means of pressure measurement.
- a guide wire for a catheter or directly the catheter is subsequently introduced into the container 2 through the access 27 and the opening 29 and then advanced through the measuring channel 4 and the cannula 24 into the blood vessel.
- FIG. 7 shows a second system 30.
- a seventh pressure measuring device 31 has an integrated cannula connection 26 and an access 27 for a syringe 25, which are connected to one another via a pressure line 32 indicated here by dashed lines. Part of the pressure line 32 is thus also part of the measuring channel 4.
- a second valve 33 is arranged in the measuring channel 4. If aspiration is to be performed using the connected syringe 25, the second valve 33 can be closed and then opened again for pressure measurement.
- the second system 30, by its structure, allows the syringe to be changed to a catheter.
- a further valve not shown here, is provided in the pressure line 32, with which the access 27 can be closed.
- the second system 30, like the first system 22 from FIG. 6, also allows the connection of the already known "Raulerson syringe".
- FIG. 8 shows a third system 34, in which the container 2 has been integrated into the syringe 25.
- the container 2 forms at least in part a plunger 35 of the syringe 25.
- the plunger 35 of the syringe 25 has a closable catheter passage 36. This is blocked off to the outside with a closure piece 37, while the catheter passage 36 on the other hand to a container interior 38 is open.
- the closure piece 37 is integrated in the piston 35 in this case. In another variant, not shown here, the closure piece on the container can be inserted and removed again.
- the measuring channel 4 located in the container 2 in turn also serves as a catheter passage 36 after the pressure measurement.
- the access 27 which is preferably provided with a valve (not shown here), allows the syringe 25 or a sixth pressure measuring device 23 to be connected to the side of the cannula 24 (so-called side-port cannula).
- a catheter can be inserted either directly through the cannula 24 or the attached syringe 25 or the sixth pressure measuring device 23.
- FIG. 10 shows a further variant of the configuration of the measuring channel 4 located in the container 2 of the syringe 25. While a small-lumen section 40 of the measuring channel 4 is predominantly located within the syringe cylinder 41 when the plunger 35 is moving, there is a large-lumen section 42 of the measuring channel 4 even when the piston 35 is fully pushed in, at least for the most part outside the syringe cylinder 41.
- the lumen of the measuring channel 4 in the small-lumen section 40 can be optically enlarged by suitable material and suitable shaping of the measuring channel 4 in the container 2 or the syringe cylinder 41. Low pressures measured in this small-lumen section 40 of the measuring channel 4 can thus be read accurately.
- the large-lumen section 42 of the measuring channel 4 is dimensioned for the measurement of higher pressures over a larger area.
- Fig. 11 shows a section of a possible embodiment of the container 2.
- the attached closure piece 37 serves to close and open the container interior 38, e.g. for introducing a catheter, not shown here, through the measuring channel 4 into a bloodstream, also not shown.
- FIG. 12 shows a further embodiment of the syringe 25.
- This has a vent valve 43 on one side for preparing the syringe 25 for measuring negative pressures.
- the vent valve 43 can also be arranged in the closure piece 37. Then, in addition to the task of ventilation, it also acts as a passage for a catheter.
- FIG. 13 shows a possible arrangement of the vent valve 43 which, as shown here, can be attached to the closure piece 37 or in the closure piece 37.
- FIG. 14 shows a further embodiment of the closure piece 37. This can be adjusted in a controlled manner in the container 2 by means of the positioning means 44. To adjust the measuring channel 4 has an external thread 45 and the closure piece 37 in part - 24 -
- the closure piece 37 with a closable passage 49 now has the external thread 45, while the syringe cylinder 41 has the internal thread 46.
- the insertion of a catheter into the container 2 is again possible via a passage valve 50 in the closure piece 37, a passage opening 51 in the closure piece 37 being directly opposite the mouth 17 of the measuring channel 4 in the container 2.
- the measuring channel 4 also has a funnel 52. Since the closure piece 37 also remains spaced from the measuring channel 4 in its end positions, the funnel 52 serves to better insert a catheter into the measuring channel 4.
- the piston 35 and the syringe cylinder 41 have a tongue and groove system. Only by turning the piston 35, indicated by the arrow, can the tongue 54 and the groove 55 be brought into congruence for the insertion of the spring 54 into the groove 55.
- Other mechanical systems, such as obstacles or the like to be overcome by the application of force, can also be used as the pressure protection 53. in the pressure direction of the piston.
- FIG. 17 shows a base 57 of the piston 35 which faces a cylinder space 56 of the syringe 25 shown in a detail.
- the bottom 57 tapering to the mouth of the measuring channel 4 prevents an air bubble from getting stuck on the cylinder wall 59 in the cylinder space 56, as can be observed with a bottom 57 running perpendicular to the measuring channel 4.
- the bottom 57 can have a concave shape. - 25 -
- the container 2 is in turn integrated into the piston 35.
- the measuring channel 4 is arranged eccentrically.
- a first seal 58 to the cylinder wall 59 of the syringe 25 is arranged on the piston 35 in such a way that it cannot rotate.
- the first seal 58 thus follows the upward and downward movement of the piston 35, the piston 35 itself remaining rotatable within the first seal 58.
- the first seal 58 has a passage 60.
- FIG. 19 shows a cross section through the first seal 58 and the syringe cylinder 41 of the syringe 25 from FIG. 18.
- a free inner surface 61 offers enough space for the piston, not shown.
- the syringe cylinder 41 has a material thickening 63 to which the first seal 58 is adapted.
- the passage 60 in the first seal 58 is arranged so that it can be opened or closed by rotating the piston, not shown.
- other safety devices belonging to the prior art can also be used, which on the one hand enable the piston to move up and down, but on the other hand prevent the first seal 58 from rotating.
- FIG. 20 shows a second seal 64, which is designed according to the principle of the anti-rotation device 62 from FIG. 19.
- the second seal 64 has a mouth closure
- the mouth closure 65 is advantageously a dome-shaped elevation 66.
- the seal 64 which is very effective in this way, moreover offers a certain resistance when the piston rotates, as long as the mouth of the measuring channel 4 is closed. This means that the operator shares this position based on - 26 -
- the rotary stop 67 for example in Form of an elevation extending along the second seal 64, also part of the mouth closure 65 or the passage 60, the same applies to the position indicator 68, which in this case is arranged centrally between the mouth closure 65 and passage 60 on the second seal 64 continue to be appropriate since the piston or the cylinder wall has a rotation stopper for the piston, which, play in connection with other rotary abutment or the rotary abutment 67 on the second gasket 64 acts either alone
- FIG. 21 a cross-section along the line XXI-XXI from FIG. 20, shows that the dome-shaped elevation 66, like the round bead 69, is part of the second seal 64 is ensured by appropriate free spaces 70 within the second seal 64.
- the piston can engage in this free space 70 in a correspondingly configured manner and thus pull the second seal 64 along.
- the free spaces 70 are designed such that the piston remains rotatable within the second seal 64.
- the second seal can 64 can also be designed as a double seal, which is then rotatably arranged in an annular groove of the piston.
- the 22 shows a further embodiment of the syringe 25 in a schematic view.
- the syringe cylinder 41 again has a material thickening 63 - 27 -
- this serves as a rotation lock for the seal, which is not shown in FIG. 22.
- it can be used as a magnifying glass for measuring channel 4, which in the open position, i.e. during the pressure measurement, is directly below the material thickening 63.
- the pressure display can be read very well.
- tactile mark 71 on the piston 35 can be seen whether the measuring channel 4 is open or closed.
- This mark 71 is located directly opposite one attached to the syringe barrel, e.g. counter marker 72, which can also be felt, measuring channel 4 is open.
- FIG. 23 shows the third seal 73, not shown in FIG. 22.
- the passage 60 lies exactly opposite the material thickening.
- Fig. 24 shows a further embodiment of the closure piece 37.
- the rotating part 74 is connected to a guide part 75 via an intermediate seal 76, which e.g. may have the sealing features described in FIG. 21, rotatably connected.
- a first channel 77 in the rotating part 74, the passage 60 in the intermediate seal 76 and a second channel 78 in the guide part 75 can be made to coincide to form the passage 49 in the closure piece 37.
- the pressure measuring device which is closed at the rear by the closure piece 37, can thus be vented or opened for the advancement of a catheter.
- the passage 49 is indicated by dashed lines.
- an intermediate seal without a passage can also be used, in which the passage only when pierced, e.g. when advancing a catheter, is generated in the material of the intermediate seal.
- a material can be used from the outset between the first 77 and second 78 channels, which allows the passage 60 to be introduced subsequently.
- Fig. 25 shows again a schematic view of a closure piece 37, which remains spaced from the measuring channel 4 in the piston in any position.
- the mouth 17 of the measuring channel 4 and the closure piece 37 prevent blood or other liquids from escaping from the passage 49 indicated by the broken line and thus contamination of the operator. Rather, the blood drips into the container 2.
- the closure piece 37 can have a draining surface 80 opposite the mouth 17 of the measuring channel 4. This is designed so that even if there is a sudden escape of blood or other liquids from the mouth 17 of the measuring channel 4, for example by inclining the draining surface 80, an exit from the passage 49 is prevented even when it is open.
- FIG. 26 shows a different design of closure piece 37 and measuring channel 4 compared to FIG. 25.
- Measuring channel 4 additionally has a lateral recess 81 which opens towards container 2.
- the closure piece 37 is placed on the measuring channel 4 at the mouth 17, whereby the advancement of a catheter into the measuring channel 4 is facilitated. Through the recess 81, the function of the pressure measurement is still retained.
- the recess 81 then serves as the mouth 17 of the measuring channel 4 into the container 2.
- the recess 81 of the measuring channel 4 can also be blocked, thus increasing the measuring range of the pressure measuring device.
- FIG. 27 shows a further embodiment of measuring channel 4 and closure piece 37.
- a displaceable sealing plug 82 is located in measuring channel 4. This can be moved up and down in the measuring channel 4 by means of a guide 83, in this case a wire 84, from outside the container 2 .
- the associated closure piece 37 has a fourth seal 85, which allows the sealing plug 82 to be removed.
- the fourth seal 85 is designed such that it is also possible to reinsert the sealing plug 82 or, for example, a catheter.
- the sealing plug 82 is in turn shaped so that it fits into a constriction 86 in the measuring channel 4 or in the pressure line, not shown here, and fills it - 29 -
- the measuring channel 4 can only be opened for the pressure measurement and closed again after the pressure measurement, if necessary, for example for repeated aspiration of blood, without completely removing the sealing plug 82 from the container 2.
- the blood pressure measurement is thereby interruptable and in particular repeatable After the interruptions, for example, adjustment processes are possible.
- the constriction 86 is arranged closer to the cannula connection (not shown) than to the mouth 17 of the measuring channel 4 in the container 2
- closure piece 37 with a suitable positioning means 44.
- the passage through the closure piece 37 is not shown in this case.
- the closure piece 37 can be adjusted along a step-like cutout 88 in the piston 35 until the measuring channel 4 is closed
- the step-like cutout 88 defines various adjustment positions of the closure piece 37, in which the closure piece 37 is secured against unintentional slipping back, for example under pressure in the piston, by gradually inserting the closure piece 37 prepare the pressure measuring device in defined steps for the measurement of higher pressures, by gradually withdrawing the closure piece 37 for the measurement of lower and even negative pressures
- the invention describes the concept of a simple, compact, easily understandable, sufficiently accurate and easy to sterilize disposable manometer, preferably in the form of a syringe, with which spaces, for example, of the human body can be identified or differentiated by means of the pressure and by which suitable construction without contamination of the working area, guidewires for catheters or catheters can be inserted in spaces, for example, of the human body
- a pressure-sensitive hose line, a closed system also has hygienic advantages.
- the solutions described here are also suitable for the continuous "bloody" measurement of arterial (medium) pressure, e.g. as part of emergency medicine, for monitoring central venous (medium) pressure or for measuring brain water pressure.
- the syringe described in various configurations does not necessarily require precision manufacture and can in principle be built from five parts.
- the syringe With a sufficiently large volume of air in the piston and depending on the relationship between the volume of the measuring channel and the cavity in the piston, the syringe can be designed or optimized as required for certain pressure measuring ranges.
- the friction of the sealing lip of the plunger only has to be high enough to hold the plunger in its position in the syringe barrel even when the injecting finger completely relieves the plunger.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19980652T DE19980652D2 (de) | 1998-04-21 | 1999-04-21 | Vorrichtung und Verfahren zur intravasalen Druckmessung und kontaminationsarmen Einlage von Kathetern z.B. in Blutgefäße |
AU38198/99A AU3819899A (en) | 1998-04-21 | 1999-04-21 | Device and method for measuring intravascular pressure and for low contaminatingintroduction of catheters, for example, in blood vessels |
US09/673,988 US6485428B1 (en) | 1998-04-21 | 1999-04-21 | Apparatus for and method of intravasal pressure measurement and low-contamination insertion of catheters for example into blood vessels |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19817762A DE19817762A1 (de) | 1998-04-21 | 1998-04-21 | Vorrichtung zur intravasalen Druckmessung und kontaminationsarmen Einlage von Kathetern z. B. in Blutgefäse |
DE19817762.3 | 1998-04-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999053835A1 true WO1999053835A1 (de) | 1999-10-28 |
Family
ID=7865300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/002689 WO1999053835A1 (de) | 1998-04-21 | 1999-04-21 | Vorrichtung und verfahren zur intravasalen druckmessung und kontaminationsarmen einlage von kathetern z.b. in blutgefässe |
Country Status (4)
Country | Link |
---|---|
US (1) | US6485428B1 (de) |
AU (1) | AU3819899A (de) |
DE (2) | DE19817762A1 (de) |
WO (1) | WO1999053835A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6736783B2 (en) * | 2000-04-12 | 2004-05-18 | Merck & Co., Inc. | Automated blood sampling apparatus |
SE522098C2 (sv) | 2001-12-20 | 2004-01-13 | Bone Support Ab | Ett nytt benmineralsubstitut |
EP1440656A3 (de) * | 2003-01-14 | 2004-10-06 | Radi Medical Systems Ab | Vorrichtung zur sichtbaren Anzeige eines Blutdrucks |
SE0300620D0 (sv) | 2003-03-05 | 2003-03-05 | Bone Support Ab | A new bone substitute composition |
US7662110B2 (en) * | 2003-07-30 | 2010-02-16 | One Stick, Llc | Devices for collecting blood and administering medical fluids |
SE527528C2 (sv) * | 2004-06-22 | 2006-04-04 | Bone Support Ab | Anordning för framställning av härdbar massa samt användning av anordningen |
US7717856B2 (en) * | 2005-05-02 | 2010-05-18 | Qdevice Medical Inc. | Non-toxic liquid column sphygmomanometer |
US9180137B2 (en) | 2010-02-09 | 2015-11-10 | Bone Support Ab | Preparation of bone cement compositions |
JP5615030B2 (ja) | 2010-04-30 | 2014-10-29 | 日本コヴィディエン株式会社 | シリンジ及びそのシリンジを有するカテーテルセット |
PL2958603T3 (pl) | 2013-02-20 | 2018-10-31 | Bone Support Ab | Ulepszone zestalanie utwardzalnego materiału zastępczego kości |
CN105433930B (zh) * | 2015-12-31 | 2022-09-27 | 合肥中纳医学仪器有限公司 | 一种用于静脉血压测量的光纤测压装置 |
US10912539B2 (en) * | 2017-02-07 | 2021-02-09 | New York University | Endoswab for sampling and culture in minimally invasive surgery |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2866453A (en) * | 1957-05-29 | 1958-12-30 | Warren R Jewett | Direct reading hypodermic pressure indicating device |
FR2268536A1 (en) * | 1974-04-23 | 1975-11-21 | Miller William | Intravenous pressure meter - is for peripheral and central veins arteries and spinal cord fluid |
US4282881A (en) * | 1979-05-10 | 1981-08-11 | Sorenson Research Co., Inc. | Manometer for infusion apparatus |
US4813938A (en) | 1987-09-17 | 1989-03-21 | Raulerson J Daniel | Catheter introduction syringe |
US4817629A (en) * | 1986-01-03 | 1989-04-04 | Stryker Corporation | Process and apparatus for measurement and monitoring of muscle compartment pressure |
DE19503230A1 (de) | 1995-02-02 | 1996-08-08 | Dietmar Dr Med Enk | Spritze mit einer in den Kolben integrierten Dämpfungs- und Druckmeßeinrichtung und Verfahren zur vergleichmäßigten und druckkontrollierten Injektion mittels dieser Spritze |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3656480A (en) * | 1969-06-17 | 1972-04-18 | Leveen Harry H | Syringe |
US3730168A (en) * | 1970-09-10 | 1973-05-01 | Kendall & Co | Manometer |
US3807389A (en) * | 1971-12-29 | 1974-04-30 | M Sturman | Medical instrument for measuring fluid pressure |
US3942514A (en) * | 1974-02-28 | 1976-03-09 | Ims Limited | Arterial blood sampling device with indicator |
FR2286536A1 (fr) | 1974-09-24 | 1976-04-23 | Lelandais Joseph | Moteur electrique a transmission mecanique |
US4727887A (en) * | 1985-07-08 | 1988-03-01 | Habley Medical Technology Corporation | Hypodermic manometer |
US4624659A (en) * | 1985-09-24 | 1986-11-25 | Goldberg Edward M | Syringe with pressure sensing means |
US4759750A (en) * | 1986-12-22 | 1988-07-26 | Dlp Inc. | Pressure sensing syringe |
US5106371A (en) * | 1990-02-28 | 1992-04-21 | Mo Zhao | Clinical Syringe to be rendered useless after being used once |
US5314415A (en) * | 1993-07-21 | 1994-05-24 | Sterling Winthrop Inc. | Aspirating plunger for power injector cartridges |
-
1998
- 1998-04-21 DE DE19817762A patent/DE19817762A1/de not_active Withdrawn
-
1999
- 1999-04-21 DE DE19980652T patent/DE19980652D2/de not_active Expired - Lifetime
- 1999-04-21 WO PCT/EP1999/002689 patent/WO1999053835A1/de active Application Filing
- 1999-04-21 AU AU38198/99A patent/AU3819899A/en not_active Abandoned
- 1999-04-21 US US09/673,988 patent/US6485428B1/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2866453A (en) * | 1957-05-29 | 1958-12-30 | Warren R Jewett | Direct reading hypodermic pressure indicating device |
FR2268536A1 (en) * | 1974-04-23 | 1975-11-21 | Miller William | Intravenous pressure meter - is for peripheral and central veins arteries and spinal cord fluid |
US4282881A (en) * | 1979-05-10 | 1981-08-11 | Sorenson Research Co., Inc. | Manometer for infusion apparatus |
US4817629A (en) * | 1986-01-03 | 1989-04-04 | Stryker Corporation | Process and apparatus for measurement and monitoring of muscle compartment pressure |
US4813938A (en) | 1987-09-17 | 1989-03-21 | Raulerson J Daniel | Catheter introduction syringe |
DE19503230A1 (de) | 1995-02-02 | 1996-08-08 | Dietmar Dr Med Enk | Spritze mit einer in den Kolben integrierten Dämpfungs- und Druckmeßeinrichtung und Verfahren zur vergleichmäßigten und druckkontrollierten Injektion mittels dieser Spritze |
Also Published As
Publication number | Publication date |
---|---|
DE19817762A1 (de) | 1999-10-28 |
DE19980652D2 (de) | 2001-04-12 |
US6485428B1 (en) | 2002-11-26 |
AU3819899A (en) | 1999-11-08 |
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