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Below is a brief overview of a mechanical device that has a potential application in hybrid heart pumps (HHP).


By James Kwok CPEng; FIEAust; MCMechE; FAIM; NPER; Patents Pending by Cullens-Patent Attorneys Brisbane, QLD Australia


HeartPlus is a revolutionary bio-medical engineering heart pump intended to rejuvenate class 4 heart’s failures in human body where a total transplant is required. The mini mechanical heart pump is intended to be a compact stand-alone system implanted within the existing heart’s ventricle-cavities only, whilst atriums are untouched. HeartPlus assembly is connected to the existing heart-arteries via its existing valve-openings, being at transcupid and mitral at the atriums and at pulmonic and aortic at the top chambers. The connections to superior vena cava and pulmonary veins are also therefore untouched.

HeartPlus is intended as a permanent-fit and thus a possible alternative to heart transplant.



HeartPlus consists of two-diaphragms configured in a leaflet-type to operate within the ventricles cavities. It has four-mechanical valves with connecting-tubes to existing arteries via valving-openings. These diaphragms normally contract on systolic position being post-action of systolic-pressure, and expand in accordance with the optimum required at diastolic position, being the required diastolic-pressure, as well as flow rate. These diaphragms act as a ‘pump’ in a same manner the heart operates, with the sequence activated by the body's natural electrical-pulses.

The operation of these diaphragms is made possible with a patent-pending mechanical device called Torque-Reversal and Clutch Gear Coupling (referred to as kwokgear), that for the first time this device enables a torque being produced at Diastolic-mode, and capable to cause a torque-reversal thereby allowing Systolic position to be attained in synch and contemporaneously. 

This kwokgear can also allow Diastolic-mode to reduce and expand further to a setting in accordance with the body's natural electrical-pulses and signals that activates a small-electronic motor embedded in the HeartPlus assembly.


HeartPlus concepts key parameters for an adult:


  • Diaphragms are of body internal-friendly membranes capable to operate at 25kPa of operating pressures. The chambers volume normal operating retention up to 1L, allowing flow-rate reticulation up to 0.2L/s or 12L/min.


  • Diaphragms functioning regulated by support-strut members via a mini-helical-screw arrangement that is activated by kwokgear. There is only one helical assembly required, and it is embedded inside the diaphragm cavity at the base of the ventricles.


  • Kwokgear is spring-loaded for Auto-Systolic-Modes that produces pressure equal to 25kPPa. There is only one gear required.


  • Small electronic motor activation-signals from a micro-chip auto-current-regulator (ACR) that receives body electrical pulses. Torque on motor rating of about 0.45Nm is synch to overall required operating pressure of about 37kPa, allowing Diastolic modes to a pressure of equal to about 12kPa. There is only one motor required, and only an electrical pulse required to energize heartplus device, thereby very small external power needed, thus prolongs small battery lives.


  • It is possible to use Lithium-ion-Ionix high capacity batteries (2) are installed being one-operation and one-stand by, each battery rated at 6V 60Ahs, giving 1 week before charging for 10minutes before during asleep, etc.  In the future when the battery is embedded internally, the charging of these batteries is done via a remote block-sensor being placed on an outer-skin at a convenient location where the internal block-receptor is fitted. This avoid any external connection and subsequent surgery.


  • The Diaphragms are expandable when fitted to allow expandability consistent with body and heart growth in the event the recipient is an adolescent. On this instance it may be necessary to fit the heartplus mechanical device just external to heart abdomen.


  • There is no external connection required, except for battery connecting-pod, where a stand-by battery is located internally and always takes priority for being charged by the external battery.




 The key aspects for the HeartPlus:


  1. The unit's left-side is anchored at aortic and mitral valves at leftventricle. At systole compresses via aortic valve; and at diasystole fills via mitral valve, whilst in-flow to left atria via pulmonary veins remains.
  2. The unit's right-side is anchored at tricuspid and pulmonic valves. At systole compresses via pulmonic valve to lung; and at diasystole fills via tricuspid valve, whilst in-flow to right atria via superior vena cova remains.
  3. The unit's left and right is one-assembly as an integrated unit where the mechanisms are fitted along the wall of left and right ventricles or septum. Part of septum requires removal.
  4. The unit therefore has four mechanical check-valves.
  5. The unit's filament cables (one only) will penetrate at the bottom of the septum, and terminates at the outer body near hip as a connecting pod.
  6. The entire unit is embedded in the ventricles-cavities, and then stitched opening. It is intended that the assisted-movements reduces side-effects to muscles.
  7. It is possible to install the unit only for either side of ventricle depends upon requirements, means it is also possible to install only for one side with the ability to extend for other side, using the same pre-fitted mechanisms. Heartplus mechanism activation is by body electric pulse, whilst the motor is battery operated.
  8. The assembly can be set as normally diasystolic or normally systolic according to the body electric pulse, thus ensuring the normal haemodynamics and for higher rate can be achieved, as the heartplus mechanism capable to increase modulations and blood flow rate.
  9. There will be much more r&d to be done including trial at animals followed by clinical, but our intention is to leave it with the experts from here, other than participating in the devise developments if required.