EP2470069A1

EP2470069A1 - Pressure transducer for medical use and contact holder

Info

Publication number: EP2470069A1
Application number: EP10741984A
Authority: EP
Inventors: Bernd Beck; Alojz Simoncic
Original assignee: HYB doo
Current assignee: HYB doo
Priority date: 2009-08-28
Filing date: 2010-08-12
Publication date: 2012-07-04
Also published as: JP2013502949A; CN102869302A; US20120157862A1; DE102009039958A1; BR112012004256A2; WO2011023562A1; DE102009039958A8; CN102869302B

Abstract

The invention relates to a pressure transducer for measuring blood pressure for medical use, which can be connected by pressure to the vascular system of a patient, said transducer comprising a pressure measuring element for measuring the prevailing pressure in the fluid chamber, and also mechanical holding means for detachably mounting the pressure transducer onto the contact holder. The invention also relates to a contact holder for holding and for electrically contacting a pressure transducer for medical use.

Description

description

Title: Medical pressure transducer and contact holder

The invention relates to a pressure transducer for medical

Blood pressure measurement, as well as a contact holder for holding and electrical contacting of medical pressure transducers.

Such pressure transducers usually have a fluid space which is pressure-bondable with the vascular system of a patient. For the pressure connection, fluid hoses may be used, which are filled with physiological electrolyte solution (for example NaCl solution). The fluid space communicates with a pressure measuring element for converting the pressure into electrical measuring signals. To operate such a pressure transducer, it is therefore necessary to electrically contact the device and at the same time to a

liquid-filled system.

DE 198 51 274 A1 shows a pressure transducer with a

electrical plug connection. In this case, a pin-like plug can be inserted into a socket, wherein a punctiform in the insertion direction elastic sealing element is provided at the socket opening. On the one hand, the sealing element has the task of substantially sealing the opening of the bushing in a liquid-tight manner and, on the other hand, stripping any liquid drops from the plug when the plug is inserted.

In medical applications, special requirements are placed on pressure transducer assemblies. Prolonged examinations or treatments of different patients require frequent replacement of pressure transducers, especially for hygienic reasons. In this case, it is easy for one of the plurality of fluid hoses and cables to make electrical contact with the pressure transducers

confusing situations come about, resulting in unintentional situations

Disconnections and thus not least can endanger the health of the patient. Due to the frequent changes the pressure transducers are also consumables, which therefore preferably be inexpensive to produce as a mass-produced should. Elaborate mechanical structures with many components, such as filigree sealing elements on sockets, therefore, in particular for cost reasons for the consumable

Pressure transducers are not required.

When changing the pressure transducer, it can easily come to contamination of the pressure transducer assembly with liquid from the fluid system. Since the physiological electrolyte solutions used have a good electrical conductivity, this creates the risk of short circuits and / or shunts, in particular in the field of electrical contacting of the pressure transducer. This can lead to changes in the measured current, voltage and

Resistance values and thus lead to a falsification of the measured values. Permanent contact with electrolyte solution can also lead to corrosion of metal contact pads and other electrical components. In view of this problem, in the known in the art plug-in connections with sealing elements a complete sealing of the socket or the complete dry maintenance of the plug in principle difficult or not achievable.

The invention is based on the object

To provide pressure transducer assembly, which allows the mounting and electrical contacting of pressure transducers in a simple and robust manner and also allows under the influence of liquids trouble-free operation.

This object is solved by a pressure transducer with the features of claim 1 and also by a contact holder for holding and electrical contacting of a pressure transducer with the features of claim 8.

The pressure transducer according to the invention is therefore characterized in that an electrically insulating base plate is provided, in which at least one electrically connected to the pressure measuring element electrical contact surface is embedded such that the surfaces of the contact surface and the base plate lie substantially in a common plane , and that by holding the Pressure transducer in the contact holder an electrical contact between the contact surface and an associated mating contact of the

Contact holder is made.

The pressure transducer is also releasably mechanically halterbar, wherein in the holder and the electrical contact of the

Pressure transducer over the embedded in the base plate

Contact surfaces occurs. Consequently, to contact the

Pressure transducer no additional cables and / or

Plug connections required what the composite

Pressure transducer arrangement comparatively well designed and thus increases the safety of treatment. It is conceivable, for example, that the pressure transducer is inserted or clamped in a correspondingly formed contact holder, wherein the base plate is so brought to a support portion of the contact holder to rest, that the contact surfaces are contacted.

The pressure transducer according to the invention is also relatively simple and robust. The base plate with embedded

Contact surfaces, the holding means, the pressure measuring element and the

Fluid space can for example be arranged in layers one above the other. This makes the pressure transducer extremely compact. Complex geometric configurations, such as sockets or connector pins, can be omitted. Furthermore, compared to known pressure transducers components can be saved; For example, no additional sealing or insulating elements are required when embedding the contact surfaces in the insulating base plate. Overall, the pressure transducer according to the invention is therefore suitable for a cost-effective, suitable for mass production process.

Since the surfaces of the contact surface and the base plate in

Essentially lying in a common plane, they adjoin one another steplessly. The entire surface or the base plate as a whole can also be curved. In any case, this avoids gaps or recesses in which

Liquid or impurities can accumulate - what For example, in male-female contacts can lead to the above-described faulty circuits and corrosion. The contact surfaces on the base plate of the invention

Pressure transducers are freely accessible and can therefore be cleaned quickly and easily and be freed from any fluid accumulation.

The base plate is preferably formed of a ceramic material which has the required hardness and rigidity, is inexpensive to manufacture and electrically insulating acts. In addition, in the manufacture of the base plate in the ceramic easily embed metallic contact surfaces, for example by pouring.

In addition, electrical circuit elements, for example functional elements for the pressure measuring element, can be applied to ceramic materials by known technical methods (for example lithography).

Advantageously, the contact surface is liquid-tightly embedded in the base plate. It is conceivable, for example, a form-fitting embedding of the contact surface in the manufacturing process. The contact surface can also be integrally worked into the base plate, so that no additional measures for sealing are required. The unit of base plate and embedded contact surface thus has an im

Essentially smooth surface, which is easy to clean and durable.

For further embodiment, an elastic pressure pad may be provided, which is arranged for transmitting the pressure between the fluid space and the pressure measuring element. The pressure pad can also be formed of a liquid-tight material, so that the electronics of the pressure measuring element is sealed against the fluid space and thereby the reliability can be increased.

A particularly preferred embodiment provides that the base plate has electrical circuits of the pressure measuring element. In particular, the base plate has all essential or all functional parts of the measuring electronics, or comprises the pressure measuring element. The electrical circuits can be used, for example, with lithographic methods be applied to the base plate. This results in a particularly compact design of the pressure transducer and a cost-effective, suitable for mass production process.

It is particularly preferred if the fluid space and the

Pressure measuring element together on one side of the base plate

are arranged and the at least one contact surface of the fluid space facing away from the base plate is accessible. Such a trained pressure transducer can be used for electrical contacting in a contact holder, wherein the functional parts

(Fluid space, pressure measuring element) facing away from the contact holder and thus are accessible for any required handling.

Advantageously, a fluid hose for connecting the

Pressure transducer provided with the patient, and the fluid space is provided by a portion of the fluid tube. This results in a further simplification of the structure, since no additional measures are required to connect the fluid space with the fluid hose and / or seal this connection. The fluid hose can rest directly on the pressure measuring element, or via a pressure pad or other intermediate elements with the pressure measuring element

interact.

For further embodiment, it is provided that the base plate provides a holding portion, which the holding means for the

Pressure transducer provides. Conceivable here are base plate side retaining edges or locking lugs. It is also conceivable that the

Pressure transducer has a housing or base and a holding means providing the holding portion, which is arranged on the housing or base. This also contributes to the further simplification of the structure.

The object initially set is also by a contact holder for holding and electrical contacting of a medical

Pressure transducer solved. The contact holder provides a plate-like support portion, which has at least one contact pin having a contact tip as an electrical counter-contact for a contact surface of the pressure transducer, wherein the contact pin is arranged substantially perpendicular to the support portion such that the

Contact tip facing away from the support portion and contacted with held pressure transducer, the associated contact surface. In this case, a sealing membrane formed from an elastic, hydrophobic and electrically insulating material is also provided, which is arranged adjacent to the support section and for each contact pin has a recess such that the contact pin is liquid-tightly embedded in the sealing membrane and the contact tip of the

Sealing membrane is released.

The sealing membrane is preferably made of a polysiloxane (silicone)

formed, which is elastic, electrically insulating and repellent to polar liquids (hydrophobic) and also can be inexpensively manufactured with almost any shape. However, other elastomeric materials are also conceivable. In particular, the sealing recesses for the pins can be easily in the

Produce the sealing membrane of a polysiloxane (silicone) realize.

By holding a pressure transducer in a contact holder according to the invention, an electrical connection can be achieved without additional cables or connectors, which has already explained above for pressure transducer according to the invention advantages.

Also, the contact holder is relatively simple and compact

constructed, since only substantially planar components are joined together adjacent to each other. Again, a cost-effective production, even as a mass-produced, possible.

Since the contact pins are embedded liquid-tight in the recesses and only the contact tips are released, the contact region of the contact holder has a substantially continuous, smooth surface. The accumulation of fluids and

Dirt in columns or recesses is largely avoided. In addition, the electrical contact area is easy to clean.

As explained above, in particular impurities with the fluid of the fluid system for pressure measurement is a problem for the electrical contacting is usually used as fluid physiological electrolytes (for example, NaCl solution), which are polar and electrically conductive, usually aqueous solutions. Since the sealing membrane is hydrophobic, a large-area wetting of the

Contact area largely avoided by the said fluids. On the one hand, this facilitates cleaning in case of soiling or moistening and can prevent corrosion through permanent liquid contact. On the other hand, by the hydrophobic and electrically insulating

Sealing membrane reduces the risk of short circuits or shunts between adjacent contact pins and / or contact surfaces, without the need for additional components for sealing or insulation are necessary (as done for example in the known plug-socket contacts in the form of a sealing element).

Preferably, in the contact holder according to the invention

Pressure transducer mounted so that the base plate

or contact surfaces are pressed against the sealing membrane or contact tips. Since the sealing membrane is elastic, thereby any existing liquid droplets are pushed out of the contact area. Especially in the

Interaction with the hydrophobic design of the sealing membrane is thus the risk of short circuits or shunts largely reduced, allowing trouble-free operation even in humid environments.

A particularly preferred embodiment of the contact holder results from the fact that the sealing membrane has an annular sealing bead around the recess, which sealingly bears against the contact pin.

In particular, it is advantageous if the sealing bead is dimensioned such that it is flush with the contact tip such that the contact tip and the sealing bead rise equally far above the surface of the sealing membrane.

When held pressure transducer any liquid present in the area around the contact pin is displaced by the sealing bead. As a result, the risk of unintentional short or shorts to other pins and / or contact surfaces largely avoided become.

Preferably, it is provided that the contact pin a

cylindrical shaft and a pin head with larger radial

Diameter than the shaft, wherein the pin head has the contact tip and rests against the sealing membrane and wherein the sealing membrane surrounds the shaft liquid-tight. By the pin head with a larger diameter, the recess, which encloses the shaft of the contact pin liquid-tight, additionally covered. As a result, the sealing effect of the sealing membrane against liquid entry into the region between different contact pins is increased.

The contact tip is advantageously formed mushroom-like and / or cap-like rounded. As a result, peaks or sharp edges are avoided, which could for example lead to damage to contact surfaces of the pressure transducer or fluid hoses.

A particularly preferred development of the invention results

in that the contact pin is provided on the support section in such a way that the contact tip can be pressed in the direction of the support section against a bias applied by a spring element. The spring element can, for example, of the elastic

Sealing membrane itself be provided on the surface of the particular as a pin head with a larger radial diameter

trained contact tip is applied. It is also conceivable that a spring element is arranged on or around the contact pin, which the

Contact tip against the support member applied. Becomes a

Pressure transducer mounted in such a contact holder, it can be achieved by the impressible arrangement of the contact tip under bias that the contact tips when inserted

Pressure transducers are pressed against the corresponding contact surfaces. This provides a good electrical contact, even if the contact surfaces and / or the contact tips are contaminated or damp. This increases the reliability of the

Pressure transducer arrangement.

For further embodiment of the contact holder is a holding device provided such that a pressure transducer is parallel to the support portion for releasable support on the contact holder inserted. When using the contact holder with an inventive

Pressure transducer is provided in particular that the

Pressure transducer with its base plate parallel to the support portion in the holding device can be inserted. This allows a quick, easy and releasable holding the pressure transducer can be achieved. In particular, it is advantageous if when inserting the

Base plate of the pressure transducer to the sealing membrane of

Contact holder is pressed. As a result, liquid drops are stripped from the contact area and thus malfunction by short or

Shunts avoided.

Advantageously, the contact holder comprises an electrical circuit board, which on the side facing away from the sealing membrane parallel to

Carrier portion or adjacent to the support portion is arranged such that the contact pin is electrically contacted. The printed circuit board may in this case contain electrical conductor tracks, by means of which the electrical signals from the contact pins to a signal conducting device, e.g. a cable bundle, forwarded. It is also conceivable that the circuit board has electrical circuits for processing, filtering or amplification of the signals. For example, the printed circuit board can be screwed or glued to it on the side of the carrier section facing away from the sealing membrane such that the contact pins are contacted accordingly. This results in a simple and compact, layered structure for the contact holder.

It is particularly preferred that the contact pin has an annular groove and the sealing membrane in the region of the recess has an annular projection which engages in the annular groove. In particular, the attacks

Ring projection in such a way in the annular groove, that the contact pin is axially movably supported in the sealing membrane. Advantageously, the annular projection is designed to match the annular groove. As a result, by the engagement of the annular projection in the annular groove

Liquid-tight embedding of the contact pin in the sealing membrane be achieved.

The advantages presented above come especially in one

Pressure transducer assembly to advantage, which a

Pressure transducer according to the invention and a contact holder according to the invention comprises. The contact surfaces in the base plate of the pressure transducer are arranged coordinated with the embedded in the sealing membrane of the contact holder pins. The contact holder can be integrated, for example, in the housing of a data evaluation and transmission unit of a patient monitoring system.

Further details and advantageous embodiments of the invention will be apparent from the following description, on the basis of which the embodiments of the invention shown in the figures closer

are described and explained.

[0036] In the drawings:

1 shows a schematic section through a pressure transducer according to the invention,

2 shows a longitudinal section through a further embodiment of a pressure transducer,

3 shows the pressure transducer of Figure 2 in the rear view of the base plate with contact surfaces,

4 shows the pressure transducer of Figure 2, 3 in front view,

5 shows a schematic section of a section through a contact holder according to the invention,

Figure 6: an embodiment of contact pin and sealing membrane in

Detail,

Figure 7: an exploded view of an inventive

Contact holder,

Figure 8: the contact holder of Figure 7 in the assembled state.

For reasons of clarity, components with mutually corresponding functions are provided with the same reference numerals in FIGS.

1 shows a pressure transducer 1 with a housing section 2. In the housing section 2 is an electrically insulating base plate. 6 enclosed, which is formed here of a ceramic material. The base plate 6 lies in the housing section 2 in such a way that the base plate 6 limits the housing section 2 to the outside and is freely accessible from the outside. The housing section 2 further encloses a fluid space 4, which is pressure-bondable via fluid hoses, not shown, with the vascular system of a patient. As a pressure-transmitting medium is located in the fluid space 4 physiological electrolyte solution, for example, aqueous NaCl solution.

To determine the pressure prevailing in the fluid chamber 4 pressure is a

Pressure measuring element 8 is provided, which is applied to the fluid space 4 facing side of the base plate 6 on this. It is conceivable, for example, that the electronic switching elements of

Druckmesselements 8 with lithographic methods directly on the

Base plate 6 are defined. Between the pressure measuring element 8 and the fluid space 4, an elastic pressure pad 10 of a polysiloxane (silicone) is arranged, via which the pressure prevailing in the fluid chamber 4 pressure is transmitted to the pressure measuring element 8. In addition, by the pressure pad 10, the electronics of the pressure sensing element 8 against

possibly leaking from the fluid space 4 leaking liquid.

In the base plate 6, two metallic, electrical contact surfaces 12 are embedded such that the surface of the contact surfaces 12 and the fluid space 4 facing away from the surface of the base plate 6 lie in a plane 14, and steplessly merge into each other. The contact surfaces 12 are therefore of the pressure measuring element 8 and the fluid space 4th

facing away from the housing section 2 accessible. The

Contact surfaces 12 have conductor pins 13 for electrical contacting of the pressure measuring element 8. The contact surfaces 12 are liquid-tightly embedded in the base plate 6 and are preferably poured in the manufacture of the base plate 6 in such a way in the ceramic material, that the conductor pins 13, the base plate 6 for

Push through pressure measuring element 8 out. The contact surfaces 12 and the conductor pins 13 are formed of a gold-plated metallic material, such as gold-plated copper. In the figure 2, a pressure transducer 20 is shown, which a

Housing 2 with a back 21 and a front 22 has. Enclosed in the housing 2 is a fluid space 4, which here by a

In order to regulate the flow of fluid (for example aqueous NaCl solution), a fluid valve 24 is arranged in the fluid hose 23.

The pressure transducer 20 also includes a ceramic

Base plate 6, which is embedded in the housing 2 and this limited to the back 21. Between the base plate 6 and the fluid space 4, an elastic pressure pad 10 made of a polysiloxane (silicone) is arranged to transmit the pressure prevailing in the fluid space 4. The section shown in Figure 2 is chosen such that the

Contact surfaces 12 are not in the cutting plane and are therefore not shown.

FIG. 3 shows a view of the pressure transducer 20 from FIG. 2 on the rear side 21 of the housing 2. Visible is the

ceramic base plate 6, are embedded in the four electrical contact surfaces 12 made of gold-plated metallic material. The surfaces of the contact surfaces 12 are freely accessible from the rear side 21 and lie in a stepless plane 14 with the surface of the base plate 6 which terminates the housing 2 to the outside.

Figure 4 shows the pressure transducer 20 of Figure 2,3 in an oblique view of the front 22. The housing 2 has a

Rear grip edge formed holding portion 26, with which the pressure transducer 20 can be held mechanically releasable in a contact holder, not shown. It is also conceivable that the base plate 6 provides the holding portion 26.

The pressure transducer 20 further includes a clamping clasp 28, with which the pressure transducer 20 in a non-illustrated

Contact holder can be releasably locked. The holding portion 26 and / or the clamping clasp 28 thus provide mechanical holding means 30 for releasably supporting the pressure transducer 20 at a Contact holder dar.

FIG. 5 shows a schematic section through a contact holder 40 for holding and making electrical contact with a medical device

Pressure transducer, as shown in Figures 1 to 4,

shown in detail white. The contact holder 40 has a plate-like support portion 42 which is formed of hard plastic. Furthermore, contact pins 44 are provided, which each have a contact tip 45 for the electrical contacting of contact surfaces 12 of a

Pressure transducer 1, 20 (see Figures 1 to 4).

To improve the electrical conductivity, the contact pins 44 are formed of a gold-plated, metallic material. The

Contact pins 44 have a cylindrical shaft 46 and a pin head 48 with a larger radial diameter than the shaft 46. The pin head 48 is formed mushroom-like and has the contact tip 45 on.

At the plate-like support portion 42 adjacent a sealing membrane 50 is arranged from silicone-like material. This material is elastic, electrically insulating and repellent to polar liquids (is hydrophobic). The sealing membrane 50 has recesses 52, in each of which a shaft 46 of a contact pin 44 is embedded perpendicular to the support section 42. The recesses 52 are dimensioned such that the elastic sealing membrane 50 bears under tension on the respective shaft 46 and thus seals against liquid. The mushroom-like contact tip 45 of the contact pin 44 abuts against the sealing membrane 50 such that the recess 52 is covered by the pin head 48.

The sealing membrane 50 has a respective recess 52 on an annular sealing bead 54. The sealing bead 54 abuts the pin head 48 and ensures a further seal against liquid.

The contact pins 44 are embedded in the sealing membrane 50 such that the contact tip 45 can be pressed in the direction of the support section 42. Since the pin head 48 rests against the elastic sealing membrane 50, the contact tip 45 is against a bias under bias. Further, a helical spring-like spring element 56 is embedded in the sealing membrane 50 about each shaft 46, which on the one hand on the support portion 42, on the other hand supported on the pin head 48 and thus the contact tip 45 is also acted upon in the direction opposite to the support portion 42.

For the transmission of electrical signals are conductor sections 58th

provided, each of which contact a contact pin 44 electrically and enforce the support portion 42 to the sealing membrane 50 opposite side.

6 shows sections through a contact pin 44 and a

Sealing membrane 50, as used to construct a device according to the invention

Contact holder can be used.

The contact pin 44 in Figure 6 has a shank 46 with shank portions 46 'and 46 ", and a mushroom-like rounded pin head 48 having a contact tip 45. The shank portion 46' has a smaller radial diameter than the shank portion 46" and this in turn The transition from shank portion 46 'to portion 46 "is formed by a radially enlarged annular collar 49. Between the annular collar 49 and the pin head 48, the contact pin 44 thus has an annular groove 47 which is here of the shank portion 46 "is formed.

The sealing membrane 50 has an abutment side 60, along which the

Sealing membrane 50 is applied to a support portion 42 for building a contact holder according to the invention. The sealing membrane 50 has two recesses 52, in each of which a contact pin 44, as shown in FIG. 6, can be embedded. In each recess 52, the recess 52 is radially narrowed by an annular projection 62 on the side facing away from the contact side 60 side 61. On the side 61, the sealing membrane 50 has a sealing bead 54 around each recess 52.

To embed the contact pin 44 in the elastic sealing membrane 50, the contact pin 44 is introduced into the recess 52 in the alignment shown in Figure 6. As a result, the sealing membrane 50 rests against the annular collar 49 in the region of the recess 52 facing the contact side 60. The annular projection 62 engages in the annular groove 47 formed between the collar 49 and pin head 48 of the contact pin 44 a. Since the sealing membrane 50 is formed elastically, the contact pin 44 is through the annular projection 62 movably supported in the direction perpendicular to the contact side 60 in the sealing membrane 50. The sealing bead 54 is radially on

Pin head 48 and seals against liquid from.

In the assembled state, the shaft portion 46 'over the

Plant side 60 of the sealing membrane 50 and forms a conductor portion 58 for electrical contacting of the contact pin 44th

Figure 7 shows to explain the structure of an inventive

Contact holder 70 the items in exploded view. Of the

Contact holder 70 has a plate-like support portion 42

Hard plastic, in which pin holes 72 are introduced. Two elastic sealing membranes 50 (compare FIG. 6) are arranged adjacent to the support section 42. Each sealing membrane 50 has recesses 52, in which contact pins 44 are embedded perpendicular to the plate-like support portion 42. The contact pins 44 each have mushroom-type pin heads 48 with contact tips 45, which are remote from the carrier section 42 in the embedded state. In this case, the pin heads 48 rest on the surface of the sealing membrane 50. To each contact pin 44 spring elements 56 are further arranged, which act on the contact tips 42 against the support portion 42, the contact points.

Each contact pin 44 also has a cylindrical shaft 46, which is embedded in the assembled state in one of the recesses 52 of the sealing membrane 50 and passes through one of the pin holes 72 of the support portion 42.

The contact holder 70 further includes an electrical circuit board 74

electrical conductors 76 on. The printed circuit board 74 is disposed on the side facing away from the sealing membrane 50 side of the support portion 42 adjacent thereto. In this case, each conductor 76 correspondingly contacts a shaft 46 of a contact pin 44.

For further contacting of the printed circuit board 74 is a contact cable 78th

provided by which electrical measurement signals can be forwarded.

For enclosing the components, the contact holder 70 has a housing 80, which by a back plate 82 and an end plate 84th is completed.

The face plate 84 has two end recesses 86 for one each

Sealing membrane 50 and thus four contact pins 44th

In FIG. 8, the contact holder 70 from FIG. 7 is assembled

State shown. The end recesses 86 of the end plate 84 release two contact areas 88, each with four contact pins 44. The

Contact tips 45 of the contact pins 44 are arranged as described above pressed under bias.

The front plate 84 has rear grip rails 90 and clamping lugs 91.

As a result, in each case one holding device 92 is provided for each one pressure measuring transducer 20 (compare FIGS. 2 to 4). Furthermore, 92 guide surfaces 93 are provided in the region of each holding device, which the

Insertion of a pressure transducer 20 facilitate.

For holding a pressure transducer 20, as shown in Figures 2 to 4, this is in the contact holder 70 so from above

inserted, that the base plate 6 slides along the guide surfaces 93 along. In this case, the holding section 26 of the pressure transducer 20 (cf., FIG. 4) engages in the rear grip rail 90 of the contact holder 70. If the pressure transducer 20 is fully inserted, the latched

Clamping clip 28 of the pressure transducer 20 (see Figure 4) with the clamping nose 91st

In this position, the base plate 6 with the contact surfaces 12 of

Pressure transducer 20 (see Figure 3) firmly pressed against the contact region 88 of the contact holder 70. Depending on a contact surface 12 is applied to a corresponding contact tip 45, wherein the contact tip 45 as explained above against a bias voltage can be pressed to some extent.

The pressure transducer 20 is thus releasably supported and electrically

contacted in such a way that the measurement signals of the pressure transducer 20 are provided by means of the contact cable 78 for forwarding.

Claims

claims

1. Pressure transducer (420) for medical blood pressure measurement

with a fluid space (4) which can be pressure-connected to the vascular system of a patient,

with a pressure measuring element (8) for measuring the pressure prevailing in the fluid space (4),

- And with a mechanical holding means (30) for releasably mounting the pressure transducer to a contact holder (40, 70),

characterized in that an electrically insulating base plate (6) is provided, in which at least one with the pressure measuring element (8) electrically connected electrical contact surface (12) is embedded such that the surfaces of the contact surface (12) and the base plate (6)

Substantially lie in a common plane (14), and that by holding the pressure transducer (420) in the contact holder (40, 70) a

electrical contact between the contact surface (12) and an associated mating contact (45) of the contact holder is produced.

2. Pressure transducer (420) according to claim 1, characterized in that the contact surface (12) is liquid-tightly embedded in the base plate (6).

3. Pressure transducer (420) according to claim 1 or 2, characterized in that an elastic pressure pad (10) is provided, which for

Transfer pressure between the fluid space (4) and the

Pressure measuring element (8) is arranged.

4. Pressure transducer (420) according to claim 1, 2 or 3, characterized in that the base plate (6) has electrical circuits of the pressure measuring element (8).

5. Pressure transducer (420) according to one of the preceding claims,

characterized in that the fluid space (4) and the pressure measuring element (8) are arranged together on one side of the base plate (6) and the contact surface (12) of the side facing away from the fluid space (4)

Base plate (6) is accessible.

6. Pressure transducer (420) according to one of the preceding claims,

characterized in that a fluid tube (23) is provided for connection of the pressure transducer (20) to the patient and that the Fluid space (4) from a portion of the fluid tube (23) is provided.

7. pressure transducer (420) according to any one of the preceding claims,

characterized in that the base plate provides a holding portion which provides the holding means for the pressure transducer.

8. Contact holder (40, 70) for holding and electrical contacting of a

medical pressure transducer,

(420) having a plate-like support portion (42),

which provides at least one contact pin (44) having a contact tip

(45) as an electrical mating contact for a contact surface (12) of the

Having pressure transducer (420),

wherein the contact pin (44) substantially perpendicular to the support portion

(42) is arranged such that the contact tip (45) the support portion

(42) facing away and with retained pressure transducer (420) the

associated contact surface (12) contacted,

wherein there is also provided a sealing membrane (50) made of an elastic, hydrophobic and electrically insulating material, which is arranged adjacent to the carrier section (42) and for one contact pin each

(44) has a recess (52) such that the contact pin (44) is liquid-tightly embedded in the sealing membrane (50) and the contact tip

(45) is released from the sealing membrane (50).

9. contact holder (40, 70) according to claim 8, characterized in that the sealing membrane (50) around the recess (52) has a ring-like sealing bead (54) which bears sealingly against the contact pin (44).

10. contact holder (40, 70) according to claim 8 or 9, characterized in that the contact pin (44) comprises a cylindrical shaft (46) and a pin head (48) with a larger radial diameter than the shaft (46), wherein the pin head (48) has the contact tip (45) and abuts the sealing membrane (50) and wherein the sealing membrane (50) surrounds the shaft (46) liquid-tight.

11. Contact holder (40, 70) according to any one of claims 8 - 10, characterized

in that the contact tip (45) is mushroom-shaped and / or cap-like rounded.

12. contact holder (40, 70) according to any one of claims 8 - 11, characterized in that the contact pin (44) is provided on the support section (42) in such a way that the contact tip (45) can be pressed in the direction of the support section (42) against a bias applied by a spring element (56).

13. Contact holder (70) according to any one of claims 8 - 12, characterized in that a holding device) 92) is provided such that a

Pressure transducer (420) parallel to the support portion (42) for releasable support on the contact holder (70) can be inserted.

14. Contact holder (70) according to any one of claims 8 - 13, characterized in that an electrical circuit board (74) is provided, which on the side facing away from the sealing membrane (50) parallel to the support portion (42) or on the support portion (42) fitting is arranged such that the contact pin (44) is electrically contacted.

15. Contact holder (70) according to any one of claims 8 - 14, characterized in that the contact pin (44) has an annular groove (47) and the sealing membrane (50) in the region of the recess (52) has an annular projection (62) which engages in the annular groove (47).

16. Pressure transducer assembly comprising a pressure transducer according to

one of claims 1-7 and a contact holder according to one of

Claims 8 - 15.