Integrated heart preservation, transport and electrical mapping multifunctional preservation box

Abstract

The application discloses an integrated heart preservation, transportation and electric measurement multifunctional preservation box and relates to the technical field of organ transplantation. The integrated heart preservation, transportation and electric measurement multifunctional preservation box comprises a box body, a detachable sterile inner container arranged in the box body, a non-Newtonian fluid soft pad arranged between the box body and the sterile inner container, a shock absorption assembly, a plurality of guide plates in contact with the non-Newtonian fluid soft pad and slidably connected to a supporting pad arranged between the non-Newtonian fluid soft pad and the box body, a buffer air bag fixedly connected to the supporting pad and arranged on both sides of each guide plate, an adjusting assembly, an adjusting groove arranged on the supporting pad and corresponding to each guide plate, a buffer air bag in communication with the adjusting groove through a gas guide pipe arranged on both sides of the adjusting groove, an adjusting block slidably connected to the gas guide pipe, a measurement assembly, and two electrodes arranged in the box body and used for monitoring the heart. The integrated heart preservation, transportation and electric measurement multifunctional preservation box can improve the safety and reliability of the heart transportation process.

Description

Technical Field

[0001] This invention relates to the field of organ transplantation technology, and in particular to an integrated multifunctional preservation box for heart preservation, transportation and electro-labeling. Background Technology

[0002] Heart transplantation is an effective treatment for end-stage heart failure. The preservation and transport of the donor heart is one of the key steps to the success of the surgery. Currently, the traditional method of preservation and transport using sterile organ bags combined with simple ice buckets is widely used in clinical practice. However, the ice buckets have limited insulation time, large temperature fluctuations, and make it difficult to maintain a stable low-temperature environment. At the same time, it is impossible to assess the electrophysiological activity of the heart during transport. Doctors can only judge its quality after the heart starts beating again. Furthermore, when it is necessary to connect to a cardiopulmonary bypass machine for perfusion, the interfaces are not standardized, the operation is cumbersome, and the risk of contamination and connection time are increased, which is not conducive to the smooth performance of heart transplantation surgery.

[0003] During transport, the storage box is susceptible to external impacts and bumps. Often, padding is simply placed on the outside of the container holding the heart to absorb and cushion the vibrations during transport. However, this only provides shock absorption for the heart and cannot convert the impact force during transport into a force that protects and cushions the heart. It is merely a simple buffer and cannot protect, dampen, or support the heart when subjected to impacts or bumps. Moreover, it can easily cause mechanical damage to the heart and is not conducive to improving the reliability of the heart transport process.

[0004] Therefore, an integrated multifunctional storage box for heart preservation, transport, and electrophysiological measurement was invented to solve the above problems. Summary of the Invention

[0005] The main objective of this invention is to provide an integrated multifunctional storage box for heart preservation, transport, and electro-labeling, which can effectively solve the technical problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an integrated multifunctional preservation box for heart preservation, transport and electro-labeling, comprising a box body, wherein a detachable sterile inner liner is provided inside the box body, and a non-Newtonian fluid soft pad is provided between the box body and the sterile inner liner. The shock absorption assembly includes a support pad located between the non-Newtonian fluid soft pad and the housing. Multiple guide plates that contact the non-Newtonian fluid soft pad are slidably connected to the support pad. Buffer airbags that are fixedly connected to the support pad are provided on both sides of the guide plates for absorbing energy and driving the guide plates to slide. An adjustment component includes an adjustment groove formed on the support pad and corresponding to the guide plate. Both sides of the adjustment groove are connected to the corresponding buffer airbags through air ducts. Adjustment blocks are slidably connected to both sides of the air ducts to adjust the flow area of ​​the air ducts. The mapping component includes two electrodes located inside the housing for monitoring the heart during transport.

[0007] Preferably, the shock-absorbing component includes a plurality of positioning airbags fixedly connected to the non-Newtonian fluid pad, and the sterile inner liner is located between the plurality of positioning airbags. When the non-Newtonian fluid pad is subjected to force and changes shape, the plurality of positioning airbags are compressed and extend out of the non-Newtonian fluid pad to contact and constrain the sterile inner liner.

[0008] Preferably, the guide plate is provided with support airbags on both sides, which are fixedly connected to the support pad, and the support airbags are connected to the adjustment grooves on the corresponding sides through conduits.

[0009] Preferably, an adjusting plate is slidably connected within the adjusting groove, and the adjusting plate is fixedly connected to the corresponding guide plate.

[0010] Preferably, the air guide tube is cross-shaped, the opposite ends of the two adjusting blocks are wedge-shaped, and the opposite ends of the two adjusting blocks are connected to the air guide tube through elastic elements.

[0011] Preferably, when the support pad is subjected to a local impact force, the buffer airbag therein is pressurized and depressurized to drive the corresponding guide plate to slide, thereby guiding the impact force locally to the non-Newtonian fluid soft pad, so that the non-Newtonian fluid soft pad undergoes a shape change under the action of shear force.

[0012] Preferably, the inner wall of the box is provided with a composite insulation layer with the same shape as it, and the composite insulation layer is composed of a transparent vacuum insulation board and a phase change material board.

[0013] Preferably, the calibration assembly includes two connecting rods fixedly connected to the housing. One end of each connecting rod is fixedly connected to the corresponding electrode, and the other end of each connecting rod extends out of the housing and is fixed with an electrical calibration integrated interface for connecting to external instruments.

[0014] Preferably, both ends of the box body are provided with connector modules. The connector module includes a quick connector that is fixedly connected to the box body. One end of the quick connector is provided with a delivery tube that can communicate with the sterile inner liner. The other end of the quick connector is fixed with a Luer connector located outside the box body.

[0015] Preferably, a transparent protective cover of the same shape is hinged to the box body, and a locking element is provided between the protective cover and the box body to lock the protective cover to the box body. A printed flexible piezoelectric sensor is provided between the sterile inner liner and the non-Newtonian fluid cushion to monitor the state characteristics of the heart. The technical effects and advantages of this invention are as follows: This invention utilizes a coordinated arrangement of multiple buffer airbags, guide plates, adjusting blocks, support airbags, non-Newtonian fluid cushions, and positioning airbags at different locations. This not only absorbs and buffers impact forces at different locations through the buffer airbags, but also guides these impact forces to specific points via the guide plates. The support airbags further absorb and buffer energy, allowing the non-Newtonian fluid cushion to regularly harden under the shear force of the guide plates. This ensures the non-Newtonian fluid cushion provides flexible support and protection for the heart. Simultaneously, the positioning airbags, in conjunction with the positioning airbags, constrain and protect the position of the heart, preventing displacement and damage, and further ensuring the reliability of heart transport. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the structure of the present invention; Figure 3 This is a schematic diagram of the structure of the protective cover of the present invention after it is opened; Figure 4 This is a schematic diagram of the structure of the non-Newtonian fluid cushion and shock-absorbing component in this invention; Figure 5 This is a cross-sectional view of the non-Newtonian fluid cushion and shock-absorbing component in this invention. Figure 6 For the present invention Figure 5 A magnified view of a section at point A in the middle; Figure 7 This is a structural cross-sectional view of another location of the non-Newtonian fluid cushion and shock-absorbing component in this invention; Figure 8 For the present invention Figure 7 A magnified view of a section at point B in the middle; Figure 9 This is a schematic diagram showing the structure of the non-Newtonian fluid cushion and shock-absorbing component in this invention.

[0017] In the diagram: 1. Box body; 101. Composite insulation layer; 1011. Transparent vacuum insulation panel; 1012. Phase change material panel; 2. Sterile inner liner; 3. Non-Newtonian fluid cushion; 4. Shock absorption components; 401. Support pad; 402. Guide plate; 403. Buffer airbag; 404. Positioning airbag; 405. Support airbag; 406. Tube; 407. Adjustment plate; 5. Adjustment assembly; 501. Adjustment groove; 502. Air guide pipe; 503. Adjustment block; 504. Elastic element; 6. Calibration assembly; 601. Electrode; 602. Connecting rod; 603. Electrical calibration integrated interface; 7. Connector module; 701. Quick connector; 702. Delivery pipe; 703. Luer connector; 8. Protective cover; 9. Locking element; 10. Printed flexible piezoelectric sensor. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0019] When preserving and transporting organs, a sterile organ bag combined with a simple ice bucket is usually used. However, this method has many drawbacks. It cannot keep the organ in the optimal temperature range, nor can it quickly connect to external instruments to assess the electrophysiological activity of the heart during transport. It is also inconvenient to assess the organ's condition and to inject fluids to maintain the organ's physiological activity. Therefore, further improvements are needed based on the above embodiments.

[0020] like Figures 1 to 3 As shown, this embodiment provides an integrated multifunctional preservation box for heart preservation, transport and electro-labeling, including a box body 1. The inner wall of the box body 1 is provided with a composite insulation layer 101 with the same shape as it. The composite insulation layer 101 is composed of a transparent vacuum insulation plate 1011 and a phase change material plate 1012. The box body 1 is provided with a removable sterile inner liner 2. A non-Newtonian fluid soft pad 3 is provided between the box body 1 and the sterile inner liner 2.

[0021] The mapping component 6 includes two electrodes 601 located inside the housing 1 for monitoring the heart during transport. The mapping component 6 also includes two connecting rods 602 fixedly connected to the housing 1. One end of the connecting rod 602 is fixedly connected to the corresponding electrode 601, and the other end of the connecting rod 602 extends out of the housing 1 and is fixed with an electrical mapping integrated interface 603 for connecting to external instruments.

[0022] Both ends of the box body 1 are provided with connector modules 7. The connector module 7 includes a quick connector 701 fixedly connected to the box body 1. One end of the quick connector 701 is provided with a delivery tube 702 that can communicate with the sterile inner liner 2. The other end of the quick connector 701 is fixed with a Luer connector 703 located outside the box body 1. A transparent protective cover 8 with the same shape is hinged to the box body 1. A locking member 9 is provided between the protective cover 8 and the box body 1 to lock the protective cover 8 on the box body 1. A printed flexible piezoelectric sensor 10 is provided between the sterile inner liner 2 and the non-Newtonian fluid soft pad 3 to monitor the state characteristics of the heart.

[0023] In use, first remove the box 1 from the sterile packaging bag, open the protective cover 8, and replace the sterile inner liner 2 inside the box 1. Then, inject physiological fluid into the sterile inner liner 2 through the quick connector 701 and Luer connector 703 and the delivery tube 702. The quick connector 701 and Luer connector 703 are standardized connectors, which can quickly connect and inject physiological fluid during transportation, which helps maintain the viability of the heart organ. Then, place the heart organ into the sterile inner liner 2 containing physiological fluid and seal the opening of the sterile inner liner 2. Finally, secure the protective cover 8 to the box body again using the locking member 9. 1. Since both the protective cover 8 and the box body 1 are made of transparent heat-insulating material, it is convenient to directly observe the state of the heart organ in the sterile inner liner 2. The phase change temperature is set at about 4°C (cold storage temperature). The phase change material plate 1012 absorbs a large amount of heat during the phase change process, thereby keeping the internal temperature of the box body 1 in the optimal storage range. Under the combined effect of the transparent vacuum heat insulation plate 1011, the heart organ can be stored and transported. This not only makes it easy to keep the heart organ in the optimal temperature storage range, but also facilitates comprehensive observation of the heart organ in the sterile inner liner 2, improving the reliability of the storage and transport of the heart organ.

[0024] During transport, when an electrophysiological assessment of the heart is required, an external electrocardiogram (ECG) instrument is first connected to the electrode 601 via an electro-gauge integrated interface 603 and a connecting rod 602. This allows for the monitoring of electrophysiological signals such as ECG and impedance of the heart in a sterile environment. A printed flexible piezoelectric sensor 10 is installed between the sterile inner liner 2 and the non-Newtonian fluid pad 3. Both the printed flexible piezoelectric sensor 10 and the electro-gauge integrated interface 603 are existing technologies, and their specific structures and connections will not be described in detail. The printed flexible piezoelectric sensor 10 monitors the heart's condition characteristics in real time by varying the pressure at different points, facilitating multi-dimensional real-time assessment of the heart's quality by medical personnel. This ensures the heart's viability during preservation and transport, which is beneficial for the normal progress of subsequent organ transplantation surgery. At the same time, the non-Newtonian fluid pad 3 inside the housing 1 provides a certain degree of protection and shock absorption for the sterile inner liner 2, facilitating stable transport of the heart. Example 2

[0025] During use, it was found that although the non-Newtonian fluid cushion 3 can reduce the impact on the heart organ during transportation, when the impact force on the non-Newtonian fluid cushion 3 is too large, the vibration generated by the impact force can easily act on the heart organ, causing the heart organ's activity to be damaged by the impact force. At the same time, it cannot provide a certain degree of shock absorption and positioning constraint for the container of the heart organ under the action of impact force, which is not conducive to the safe transportation of the heart organ. Therefore, further improvements were made based on the above embodiments.

[0026] like Figures 2 to 9 As shown, the shock absorption assembly 4 includes a support pad 401 located between the non-Newtonian fluid soft pad 3 and the housing 1. Multiple guide plates 402 that are in contact with the non-Newtonian fluid soft pad 3 are slidably connected to the support pad 401. Both sides of the guide plate 402 are provided with buffer airbags 403 that are fixedly connected to the support pad 401 for absorbing energy and driving the guide plate 402 to slide.

[0027] The adjustment component 5 includes an adjustment groove 501 formed on the support pad 401 and corresponding to the guide plate 402. Both sides of the adjustment groove 501 are connected to the corresponding buffer airbags 403 through air pipes 502. Adjustment blocks 503 are slidably connected to both sides of the air pipes 502 to adjust the flow area of ​​the air pipes 502.

[0028] The shock absorption assembly 4 includes multiple positioning airbags 404 that are fixedly connected to the non-Newtonian fluid soft pad 3. The sterile inner liner 2 is located between the multiple positioning airbags 404. When the non-Newtonian fluid soft pad 3 is subjected to force and changes shape, the multiple positioning airbags 404 are compressed and extend out of the non-Newtonian fluid soft pad 3 to contact and constrain the sterile inner liner 2.

[0029] Both sides of the guide plate 402 are provided with support airbags 405 that are fixedly connected to the support pad 401. The support airbags 405 are connected to the adjustment grooves 501 on the corresponding side through the conduit 406.

[0030] An adjusting plate 407 is slidably connected inside the adjusting groove 501, and the adjusting plate 407 is fixedly connected to the corresponding guide plate 402.

[0031] The air duct 502 is cross-shaped, and the opposite ends of the two adjusting blocks 503 are wedge-shaped. The opposite ends of the two adjusting blocks 503 are connected to the air duct 502 through the elastic element 504.

[0032] When the support pad 401 is subjected to local impact force, the buffer airbag 403 is compressed and vented, driving the corresponding guide plate 402 to slide, thereby guiding the impact force locally to the non-Newtonian fluid soft pad 3, causing the non-Newtonian fluid soft pad 3 to change shape under the action of shear force.

[0033] It should be noted that the non-Newtonian fluid cushion 3 and the support cushion 401 can be made into a shape that partially wraps around and supports the sterile inner liner 2, providing better protection and support for the heart organs inside the sterile inner liner 2, and providing safety and stability when transporting the heart organs.

[0034] In use, when the box 1 is subjected to external impact or bumping force, the impact or bumping force acts on the support pad 401. Since one end of the buffer airbag 403 extends out of the support pad 401, the buffer airbag 403 on the support pad 401 deforms and releases gas under force, absorbing the impact or bumping force to a certain extent and slowing down the transmission of vibration. At this time, the gas in the buffer airbag 403 is injected into the adjusting groove 501 through the air guide tube 502. When the exhaust pressure of the buffer airbag 403 is less than the elastic force of the elastic element 504, the distance between the two adjusting blocks 503 is the smallest. The increased gas flow rate at 03 causes the gas to flow rapidly into the regulating groove 501, increasing the gas pressure within the regulating groove 501. This causes the gas-driven guide plate 402 to slide along the support pad 401 toward the non-Newtonian fluid pad 3, converting the impact or bumping force into a shearing force on the non-Newtonian fluid pad 3. After the guided impact force acts on the non-Newtonian fluid pad 3 at a fixed point, the non-Newtonian fluid pad 3 undergoes local shearing force, locally hardening to support the sterile inner liner 2 containing the heart organ and preventing the impact force from acting on the heart organ of the sterile inner liner 2.

[0035] Simultaneously, as the guide plate 402 slides along the adjustment groove 501, it drives the adjustment plate 407 to slide along the adjustment groove 501. This causes the adjustment plate 407 to push the gas in the adjustment groove 501 through the conduit 406 into the support airbag 405. The support airbag 405 inflates and expands, providing flexible support to the non-Newtonian fluid pad 3 again. At the same time, the support airbag 405 can buffer the force of the guide plate 402 sliding, so that even after the non-Newtonian fluid pad 3 hardens, there will not be too much vibration, reducing shock. The motion is transmitted to the heart organ through the sterile inner liner 2. As the non-Newtonian fluid cushion 3 hardens, it compresses multiple positioning airbags 404, causing them to extend towards the sterile inner liner 2. The positioning airbags 404 contact the circumferential side of the sterile inner liner 2, thereby constraining the position of the sterile inner liner 2 and preventing it from shifting due to impact and bumps on the box body 1, thus further ensuring the reliability of the heart organ transport.

[0036] When the impact or bump force on the buffer airbag 403 is too great, the exhaust pressure of the buffer airbag 403 is greater than the elastic force of the elastic element 504. Since the opposite ends of the adjusting blocks 503 are wedge-shaped, the gas overcomes the elastic force of the elastic element 504, causing the two adjusting blocks 503 to slide back-to-back along the air guide pipe 502. The distance between the two adjusting blocks 503 gradually increases, thus reducing the gas flow velocity through the two adjusting blocks 503 to a certain extent. This allows the gas to flow into the adjusting groove 501 without rapidly acting on the guide plate 402. Consequently, the gas drives the guide plate 402 to slide along the support pad 401 towards the non-Newtonian fluid soft pad 3, while simultaneously reducing the impact of the guide plate 402 on the guide plate. The impact force of the non-Newtonian fluid pad 3 is ultimately converted into a shear force by the guide plate 402. After the guided impact force acts on the non-Newtonian fluid pad 3 at a fixed point, the non-Newtonian fluid pad 3 undergoes local shear force and locally hardens, supporting the sterile inner liner 2 containing the heart organ and preventing the impact force from acting on the heart organ of the sterile inner liner 2. At the same time, the support airbag 405 can buffer the sliding of the guide plate 402 to a certain extent, ensuring that the guide plate 402 does not violently impact the non-Newtonian fluid pad 3, thereby avoiding the impact of vibration force after the non-Newtonian fluid pad 3 hardens, and ensuring the stability of the transport of the heart organ.

[0037] In summary, through the coordinated arrangement of multiple buffer airbags 403, guide plates 402, adjusting blocks 503, support airbags 405, non-Newtonian fluid cushions 3, and positioning airbags 404 at different locations, not only can the buffer airbags 403 absorb and buffer the impact force at different locations, but the guide plates 402 can also guide the impact force at different locations to a fixed point. Furthermore, the support airbags 405 further absorb and buffer the energy. As a result, the non-Newtonian fluid cushions 3 change from soft to hard regularly under the shear force of the guide plates 402, ensuring the flexible support and protection of the heart organs by the non-Newtonian fluid cushions 3. At the same time, with the cooperation of the positioning airbags 404, the position of the heart organs is constrained and protected, avoiding displacement and damage to the heart organs, and further ensuring the reliability of heart organ transport.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An integrated multifunctional storage box for cardiac preservation, transport, and electrolabeling, comprising a box body (1), characterized in that, The box body (1) is provided with a removable sterile inner liner (2), and a non-Newtonian fluid cushion (3) is provided between the box body (1) and the sterile inner liner (2). The shock absorption assembly (4) includes a support pad (401) located between the non-Newtonian fluid soft pad (3) and the box body (1). Multiple guide plates (402) that are in contact with the non-Newtonian fluid soft pad (3) are slidably connected on the support pad (401). Both sides of the guide plate (402) are provided with buffer airbags (403) that are fixedly connected to the support pad (401) for absorbing energy and driving the guide plate (402) to slide. The adjustment component (5) includes an adjustment groove (501) opened on the support pad (401) and corresponding to the guide plate (402). Both sides of the adjustment groove (501) are connected to the corresponding buffer airbag (403) through air pipes (502). Both sides of the air pipe (502) are slidably connected with adjustment blocks (503) for adjusting the flow area of ​​the air pipe (502). The mapping component (6) includes two electrodes (601) located inside the housing (1) for monitoring the heart during transport.

2. The integrated multifunctional preservation box for cardiac preservation, transport, and electrophysiological labeling according to claim 1, characterized in that: The shock-absorbing component (4) includes multiple positioning airbags (404) fixedly connected to the non-Newtonian fluid pad (3). The sterile inner liner (2) is located between the multiple positioning airbags (404). When the non-Newtonian fluid pad (3) is subjected to force and changes shape, the multiple positioning airbags (404) are compressed and extend out of the non-Newtonian fluid pad (3) to contact and constrain the sterile inner liner (2).

3. The integrated multifunctional storage box for cardiac preservation, transport, and electrophysiological labeling according to claim 2, characterized in that: The guide plate (402) is provided with support airbags (405) on both sides, which are fixedly connected to the support pad (401). The support airbags (405) are connected to the adjustment grooves (501) on the corresponding side through conduits (406).

4. The integrated multifunctional storage box for cardiac preservation, transport, and electrophysiological labeling according to claim 3, characterized in that: An adjusting plate (407) is slidably connected inside the adjusting groove (501), and the adjusting plate (407) is fixedly connected to the corresponding guide plate (402).

5. The integrated multifunctional storage box for cardiac preservation, transport, and electrophysiological labeling according to claim 4, characterized in that: The air guide tube (502) is cross-shaped, and the opposite ends of the two adjustment blocks (503) are wedge-shaped. The opposite ends of the two adjustment blocks (503) are connected to the air guide tube (502) through elastic elements (504).

6. The integrated multifunctional storage box for cardiac preservation, transport, and electrophysiological measurement according to claim 5, characterized in that: When the support pad (401) is subjected to a local impact force, the buffer airbag (403) therein is pressurized and the corresponding guide plate (402) slides, thereby guiding the impact force locally to the non-Newtonian fluid soft pad (3), so that the non-Newtonian fluid soft pad (3) undergoes a shape change under the action of shear force.

7. The integrated multifunctional storage box for cardiac preservation, transport, and electrophysiological labeling according to claim 1, characterized in that: The inner wall of the box (1) is provided with a composite insulation layer (101) with the same shape as it. The composite insulation layer (101) is composed of a transparent vacuum insulation plate (1011) and a phase change material plate (1012).

8. The integrated multifunctional storage box for cardiac preservation, transport, and electrophysiological labeling according to claim 1, characterized in that: The calibration component (6) includes two connecting rods (602) fixedly connected to the housing (1). One end of the connecting rod (602) is fixedly connected to the corresponding electrode (601), and the other end of the connecting rod (602) extends out of the housing (1) and is fixed with an electrical calibration integrated interface (603) for connecting external instruments.

9. The integrated multifunctional storage box for cardiac preservation, transport, and electrophysiological measurement according to claim 1, characterized in that: Both ends of the box body (1) are provided with connector modules (7). The connector module (7) includes a quick connector (701) fixedly connected to the box body (1). One end of the quick connector (701) is provided with a delivery tube (702) that can communicate with the sterile inner liner (2). The other end of the quick connector (701) is fixed with a Luer connector (703) located outside the box body (1).

10. The integrated multifunctional preservation box for cardiac preservation, transport, and electrophysiological labeling according to claim 1, characterized in that, A transparent protective cover (8) with the same shape is hinged to the box body (1). A locking member (9) is provided between the protective cover (8) and the box body (1) to lock the protective cover (8) on the box body (1). A printed flexible piezoelectric sensor (10) is provided between the sterile inner liner (2) and the non-Newtonian fluid cushion (3) to monitor the state characteristics of the heart.

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