Patent Description:
Placing a miniature implant in a cardiac chamber is the latest diagnosis and treatment method in modern medicine. The miniature implants in the cardiac chamber include sensors for obtaining ECG, blood pressure, blood flow, blood biochemistry and other parameters, and include miniature treatment equipment for slowly releasing a drug, for cardiac pacing, and for other treatments. In order to place a miniature implant into a cardiac chamber, it is necessary to perform transcatheter interventional surgery, in which the miniature implant is transported to and fixed at a specific position in the cardiac chamber, so as to prevent complications such as implant failure or embolism due to displacement or dislocation of the miniature implant.

Pacemakers are widely used as implants in human body. Today, millions of people around the world are implanted with artificial pacemakers each year to help keep their hearts beating normally. When a doctor install a pacemaker for a patient, the doctor usually places the pacemaker under thoracic muscle, and place the pacemaker in a cardiac chamber through one or several wires and electrodes to sense ECG activity and stimulate myocardial beating. These wires affect the opening and closing of heart valves with each heartbeat, which causes complications such as heart failure over time due to hemodynamic changes of the heart. A wireless miniature pacemaker is newly developed internationally, which has a size and a shape like a drug capsule, without the need for wires, and which can be placed directly in a cardiac chamber, without affecting the opening and closing of the heart valves, thereby reducing complications and simplifying operation. Due to a small size of the wireless pacemaker, the patient can have a new implantation experience, and an infection rate of the implanted system is greatly reduced.

It is a new challenge to implant a wireless miniature pacemaker at a predetermined position in the cardiac chamber. Due to the impact of heartbeat and blood flow, the wireless miniature pacemaker tends to detach from the myocardium and displace and move within the cardiac chamber. A transport tool for a wireless pacemaker has proven to be a major technical challenge problem in itself, and this challenge has limited the further development and promotion of this new technology.

An existing wireless miniature pacemaker is typically fixed at its top. For example, a spiral wire or a hook is formed at one end of a housing, and the spiral wire is screwed into myocardium or the hook is attached to intraventricular reticular myocardial structure so as to fix the wireless miniature pacemaker. Due to the impact of heartbeat and blood flow, the wireless miniature pacemaker tends to detach from the myocardium and displace and move within the cardiac chamber, resulting in embolism or poor contact between the electrodes and the myocardium, which affects ECG perception and pacing effect. Moreover, the lack of reticular tissue in atrium makes it impossible to achieve atrial pacing and cardiac dual-chamber pacing with the existing fixation member, and the effectiveness and safety of pacing are difficult to be guaranteed.

A prior art pacemaker is known from <CIT>.

The content of the disclosure is used to present ideas in a brief form that will be described in detail in the embodiments therebelow. The content of the disclosure is neither intended to identify key features or essential features of the technical solution as claimed, nor intended to limit the protection scope of the technical solution as claimed.

Further embodiments disclosed herein are for exemplary purpose only.

Some embodiments according to the present disclosure propose a detachable leadless pacemaker system that stimulates a cardiac conduction bundle to address the technical problems as mentioned in the background.

According to the invention, there is provided a detachable leadless pacemaker system for cardiac conduction bundle pacing, comprising: a detachable leadless pacemaker with a first data interface; a passive leadless pacemaker with a second data interface; and a signal wire which is coupled with the first data interface and the second data interface to supply power from the detachable leadless pacemaker to the passive leadless pacemaker, and to support communication therebetween The detachable leadless pacemaker comprises: a first pacemaker body with a first detachable structure; and a first hook-shape side electrode which is fixed with the first pacemaker body by the first detachable structure, and which is arranged in parallel with the first pacemaker body at a first predetermined distance.

Preferably, the first pacemaker body includes a first housing, wherein the first housing comprises a housing body, at one end of which the first detachable structure is provided, the housing body is provided with at least one first annular electrode and a first annular insulator which is arranged between adjacent one of the at least one first annular electrode.

Preferably, the first detachable structure comprises a first through hole, a second through hole and a restriction pin, the first through hole has at least one first clamping groove structure, the second through hole passes through the first through hole in a direction perpendicular to a plane formed by an axial direction of the housing body and an axial direction of the first through hole, the second through hole has a diameter smaller than that of the first through hole, and the restriction pin comprises a restriction post and a restriction handle, wherein the restriction post is arranged in the second through hole, and the restriction handle is exposed outside the first detachable structure.

Preferably, the first hook-shape side electrode includes a second housing, wherein the second housing comprises a first end, an electrode body and a second end which are arranged in this order, the first end is a first curved structure including a fixing post which has a third through hole and at least one second clamping groove structure, the at least one second clamping groove structure is engaged with the at least one first clamping groove structure and the third through hole and the second through hole are aligned with each other when the fixing post is inserted into the first through hole, so that the restriction post of the restriction pin is inserted into the second through hole and the third through hole, the electrode body is provided with at least one second annular electrode and a second annular insulator which is arranged between adjacent one of the at least one second annular electrode, and the at least one second annular electrode is provided respectively for the at least one first annular electrode, the second end is conical.

Preferably, the first pacemaker body further includes an internal circuit inside the first housing, wherein the internal circuit includes a circuit board and a battery coupled to the circuit board, the battery supplies power to the circuit board, the circuit board is arranged on a side close to the first detachable structure, and the battery is arranged on a side far away from the first detachable structure, the circuit board includes at least one first contact for connecting the at least one first annular electrode.

Preferably, the first pacemaker body comprises at least one first electrode lead for the at least one first annular electrode, the at least one first electrode lead is arranged in the first housing, including a first electrode lead with one end being coupled with corresponding one of the at least one first annular electrode and the other end being coupled with corresponding one of the at least one first contact.

Preferably, the circuit board is provided with a wireless communication module for information interaction with an external programmable instrument.

Preferably, a first switch is provided between the circuit board and corresponding one of the at least one first annular electrode, the first switch is used for controlling connection and disconnection between the circuit board and the first annular electrode.

Preferably, the first detachable structure is provided with at least one second contact at a side near the housing body, and the at least one second contact is coupled to the circuit board.

Preferably, a second switch is provided between the circuit board and each of the at least one second contact, the second switch is used for controlling connection and disconnection between the circuit board and the second contact.

Preferably, the first hook-shape side electrode comprises at least one second electrode lead respectively for the at least one second annular electrode, the at least one second electrode lead is arranged in the second housing, including a second electrode lead with one end being coupled with corresponding one of the at least one second annular electrode and the other end being arranged in the fixing post, the at least one second electrode lead is coupled with corresponding one of the at least one second contact when the fixing post is inserted into the first through hole.

Preferably, the first annular electrode is coupled with a first power terminal of the battery on the circuit board through the corresponding first contact, and the second annular electrode is coupled with a second power terminal of the battery on the circuit board through the corresponding second contact.

Preferably, the first annular insulator is provided with an array of apertures at a side near the first hook-shape side electrode, including at least one aperture for holding a drug.

Preferably, at least one first positioning structure is provided at the second end of the second housing at a side near the first pacemaker body.

Preferably, the passive leadless pacemaker comprises: a second pacemaker body with a second detachable structure; a second hook-shape side electrode which is fixed with the second pacemaker body by the second detachable structure, and which is arranged in parallel with the second pacemaker body at a second predetermined distance.

Preferably, the detachable leadless pacemaker is provided with a first connection part on the first detachable structure, the passive leadless pacemaker is provided with a second connection part on the second detachable structure, the first connection part and the second connection part are used for achieving a reliable connection between the detachable leadless pacemaker and the passive leadless pacemaker.

Preferably, the first hook-shape side electrode has an insertion direction which is opposite to that of the second hook-shape side electrode in a state that the first connection part and the second connection part are reliably connected.

Preferably, the detachable leadless pacemaker system further includes a mounting wire with a first wire end having a first ring and a second wire end having second ring, the first ring surrounds the first curved structure of the first hook-shape side electrode of the detachable leadless pacemaker, and the second ring that surrounds the second curved structure of the second hook-shape side electrode of the passive leadless pacemaker.

Preferably, the second pacemaker body includes at least one third annular electrode and a third annular insulator which is arranged between adjacent one of the at least one third annular electrode, the second hook-shape side electrode comprises at least one fourth annular electrode and a fourth annular insulator which is arranged between adjacent one of the at least one fourth annular electrode, and the passive leadless pacemaker encapsulates an electronic circuit which is coupled to the at least one third annular electrode and the at least one fourth annular electrode, respectively.

The above embodiments according to the present disclosure have the following beneficial effects: in the detachable leadless pacemaker system for cardiac conduction bundle pacing according to some embodiments according to the present disclosure, the detachable leadless pacemaker may be arranged in the ventricle and the passive leadless pacemaker may be arranged in the atrium, and the detachable leadless pacemaker supplies power and signals to the passive leadless pacemaker via signal wires. In a case that the first hook-shape side electrode is inserted into ventricular septum, the first pacemaker body is closely attached to an inner wall of the ventricle, thus increasing a contact surface and improving stability between the detachable leadless pacemaker and the inner wall of the ventricle. The first hook-shape side electrode and the first pacemaker body may be provided with a plurality of groups of annular electrodes. One preferable group of electrodes may be selected for pacing in view of actual requirements. With an annular structure, the contact surface between the electrode and the inner wall of the ventricle is greatly increased so as to improve effectiveness of pacing. The second hook-shape side electrode of the passive leadless pacemaker is coupled with the detachable leadless pacemaker by wires, for sensing atrial electrical signals and applying electrical stimulation, thereby realizing dual-chamber pacing in the ventricle and the atrium. The detachable leadless pacemaker is coupled with the passive leadless pacemaker by an anti-tension reinforced wire, which is used for pulling back the detachable leadless pacemaker to a new position.

These and other features, advantages and aspects of embodiments according to the present disclosure will become more apparent in conjunction with the accompanying drawings and with reference to the following specific embodiments. Throughout the accompanying drawings, identical or similar numerals indicate identical or similar elements. It should be understood that the accompanying drawings are schematic and that the elements and components are not necessarily drawn to scale.

Embodiments according to the present disclosure will be described in greater detail below with reference to the accompanying drawings. While certain embodiments according to the present disclosure are shown in the accompanying drawings, it should be understood, however, that the present disclosure may be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided for a more thorough and complete understanding according to the present disclosure. It should be understood that the accompanying drawings and embodiments according to the present disclosure are for exemplary purposes only and are not intended to limit the scope of protection as defined by the appended claims.

It is also to be noted that, for ease of description, only those portions of the accompanying drawings that relate to the invention in question are shown. The embodiments and the features in the embodiments according to the present disclosure may be combined with each other in the absence of conflict.

Note that the concepts "first", "second", etc., referred to in this disclosure are used only to distinguish between different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.

It should be noted that the modifications of "one" and "more than one" mentioned in this disclosure are schematic and not limiting, and it should be understood by those skilled in the art that unless the context clearly indicates otherwise, they should be understood as "one or more" unless the context clearly indicates otherwise.

The names of the messages or information being interacted between the plurality of devices in this disclosure are for illustrative purposes only and are not intended to limit the scope of those messages or information.

<FIG> is a structural schematic diagram of a detachable leadless pacemaker system for cardiac conduction bundle pacing in accordance with some embodiments according to the present disclosure. The detachable leadless pacemaker system for cardiac conduction bundle pacing may include a detachable leadless pacemaker <NUM> and a passive leadless pacemaker <NUM>, which are coupled with each other by signal wires <NUM>. The detachable leadless pacemaker <NUM> is used for being arranged in a ventricle and the passive leadless pacemaker <NUM> is used for being arranged in an atrium. The detachable leadless pacemaker <NUM> is provided with a first data interface <NUM>. The passive leadless pacemaker <NUM> is provided with a second data interface <NUM>. The signal wires <NUM> are respectively coupled with the first data interface <NUM> and the second data interface <NUM> for supplying power from the detachable leadless pacemaker <NUM> to the passive leadless pacemaker <NUM> and for supporting data communication between the detachable leadless pacemaker <NUM> and the passive leadless pacemaker <NUM>.

The detachable leadless pacemaker <NUM> may include a first pacemaker body and a first hook-shape side electrode. The structural schematic diagram of the first pacemaker body is shown in <FIG>. The structural schematic diagram of the first hook-shape side electrode is shown in <FIG>. The first pacemaker body is provided with a first detachable structure <NUM>. The first hook-shape side electrode is fixed with the first pacemaker body by the first detachable structure <NUM>, and is arranged in parallel with the first pacemaker body at a first predetermined distance. As can be seen from <FIG>, the detachable leadless pacemaker <NUM> may be implanted in the heart, with the first hook-shape side electrode being inserted the ventricular septum, so that the first pacemaker body abuts against the ventricular wall at a side. During myocardial motion, the detachable leadless pacemaker <NUM> can move together with the myocardium (i.e. being relatively stationary between the detachable leadless pacemaker and the myocardium).

The present disclosure fixes the first pacemaker body with the first hook-shape side electrode, and the first pacemaker body is closely attached to an inner wall of the ventricle, so that a contact area between the detachable leadless pacemaker <NUM> according to the present disclosure and the myocardium is increased and the pacemaker <NUM> can move together with the myocardium. Thus, the detachable leadless pacemaker <NUM> has improved stability in the ventricle, and has greatly reduced possibility of electrode dislocation.

Meanwhile, the detachable leadless pacemaker <NUM> according to the present disclosure has a length of about <NUM> (millimeter). The first hook-shape side electrode can be inserted near the left bundle branch and the right bundle branch of the ventricular septum, which are the "highway" of cardiac conduction. Therefore, the first hook-shape side electrode according to the present disclosure may apply stimulation more effectively. Meanwhile, the first hook-shape side electrode may also have the function of sampling electrical signals of the heart, so as to analyze the electrical signals of the heart.

The first housing of the first pacemaker body according to the present disclosure includes a housing body, and the first detachable structure <NUM> is provided at one end of the housing body. The housing body is provided with at least one first annular electrode <NUM> (four, in <FIG>), and a first annular insulator <NUM> is provided between adjacent ones of the at least one first annular electrode <NUM>. The adjacent ones of the at least one first annular electrode <NUM> may have an equal distance. The electrodes according to the present disclosure may have an annular shape, to provide a large electrode contact surface, and may have a contact point between the first annular electrode <NUM> and the myocardium which is automatically adjusted according to a position of the detachable leadless pacemaker <NUM> in the ventricle. Thus, the position of the detachable leadless pacemaker <NUM> need not be adjusted repeatedly, thereby ensuring the effectiveness of pacing.

<FIG> is a structural schematic diagram of the first detachable structure <NUM>. The first detachable structure <NUM> includes a first through hole <NUM>, a second through hole <NUM> and a restriction pin <NUM>. The first through hole <NUM> has at least one first clamping groove structure <NUM> in the first through hole <NUM>. The second through hole <NUM> passes through the first through hole <NUM> in a direction perpendicular to a plane formed by an axial direction of the housing body and an axial direction of the first through hole <NUM>. Generally, the second through hole <NUM> has a diameter smaller than that of the first through hole <NUM>. The restriction pin <NUM> includes a restriction post and a restriction handle, wherein the restriction post is arranged in the second through hole <NUM>, and the restriction handle is exposed outside the first detachable structure <NUM>.

As shown in <FIG>, the first hook-shape side electrode includes a second housing which may have a first end <NUM>, an electrode body and a second end <NUM> arranged in this order.

The first end <NUM> is a first curved structure and includes a fixing post <NUM> which includes a third through hole <NUM> and at least one second clamping groove structure <NUM>. In a state that the fixing post <NUM> is inserted into the first through hole <NUM>, the at least one second clamping groove structure <NUM> is engaged with the at least one first clamping groove structure <NUM>, and the third through hole <NUM> is engaged with the second through hole <NUM> (see <FIG>, the third through hole <NUM> and the second through hole <NUM> overlap with each other), so that the restriction post of the restriction pin <NUM> is inserted into the second through hole <NUM> and the third through hole <NUM>. At least one second annular electrode <NUM> is arranged on the electrode body, and a second annular insulator <NUM> is arranged between adjacent ones of the second annular electrodes <NUM>, and the at least one second annular electrode <NUM> corresponds to the at least one first annular electrode <NUM>, as shown in <FIG>. The second end <NUM> is conical so that it may be inserted into the myocardium.

The first pacemaker body further comprises an internal circuit in the first housing. <FIG> is a planed view of the pacemaker body of a cylindrical shape. The internal circuit includes a circuit board <NUM>-<NUM> at a side near the first detachable structure <NUM> and a battery <NUM>-<NUM> at a side far away from the first detachable structure <NUM>, and the battery <NUM>-<NUM> is coupled to the circuit board <NUM>-<NUM> to supply power to the circuit board <NUM>-<NUM>. The circuit board <NUM>-<NUM> includes at least one first contact <NUM>-<NUM> for connecting the at least one first annular electrode <NUM>. Thus, the circuit board <NUM>-<NUM> supplies power to the at least one first annular electrode <NUM> through at least one first contact <NUM>-<NUM>. Typically, the battery <NUM>-<NUM> has a weight greater than that of the circuit board <NUM>-<NUM>. In a case that the detachable leadless pacemaker <NUM> is inserted downward into the ventricular septum in the ventricular chamber in an insertion direction shown in <FIG>, the entire detachable leadless pacemaker <NUM> has a lower center of gravity, thereby reducing the possibility that the detachable leadless pacemaker <NUM> detaches from the ventricular septum, and improving stability of the detachable leadless pacemaker <NUM> after being mounted.

The circuit board <NUM>-<NUM> may be provided with a wireless communication module for information interaction with an external programmable instrument. The external programmable instrument can be placed on the body surface near the heart outside the body, and establish information interaction with the wireless communication module.

The first pacemaker body further includes at least one first electrode lead corresponding to the at least one first annular electrode <NUM>, the at least one first electrode lead is arranged in the first housing, with one end being coupled to corresponding one of the at least one first annular electrode <NUM>, and the other end being coupled to corresponding one of the at least one first contact <NUM>-<NUM>. Thus, the circuit board <NUM>-<NUM> can supply power to the first annular electrode <NUM> through the first electrode lead and the first contacts <NUM>-<NUM>.

The detachable leadless pacemaker <NUM> according to the present disclosure is provided with a plurality of first annular electrodes <NUM> and a plurality of second annular electrodes <NUM>. In an actual application, the preferable first annular electrode <NUM> and the preferable second annular electrode <NUM> may be selected for stimulation. For this purpose, it is necessary to test each group of first annular electrode <NUM> and second annular electrode <NUM>. Therefore, when testing a certain group of first annular electrodes <NUM> and second annular electrodes <NUM>, signals will not be supplied to other first annular electrodes <NUM> and other second annular electrodes <NUM>. For this purpose, a first switch may be provided between the circuit board <NUM>-<NUM> and each of the first annular electrodes <NUM>, and the first switch is used for controlling the connection and disconnection between the circuit board <NUM>-<NUM> and the first annular electrode <NUM>. Similarly, a second switch is provided between the circuit board <NUM>-<NUM> and each of the at least one second contact <NUM>-<NUM>, and the second switch is used for controlling connection and disconnection between the circuit board <NUM>-<NUM> and the second contact <NUM>-<NUM>.

The circuit board <NUM>-<NUM> also needs to supply power to the second annular electrode <NUM> on the first hook-shape side electrode. For this reason, the first detachable structure <NUM> according to the present disclosure is provided with at least one second contact <NUM>-<NUM> at a side near the housing body, wherein the at least one second contact <NUM>-<NUM> is coupled with the circuit board <NUM>-<NUM>.

The first hook-shape side electrode may also include at least one second electrode lead corresponding to the at least one second annular electrode <NUM>, and the at least one second electrode lead is arranged in the second housing, with one end being coupled to corresponding one of the at least one second annular electrode <NUM>, and the other end being arranged in the fixed post <NUM>. The at least one second electrode lead is coupled to corresponding one of the at least one second contact <NUM>-<NUM> in a state that the fixing post <NUM> is inserted into the first through hole <NUM>. Thus, the circuit board <NUM>-<NUM> may supply power to the second annular electrode <NUM> through the second electrode lead and the second contacts <NUM>-<NUM>.

In practice, in order to realize pacing, the first annular electrode <NUM> and the second annular electrode <NUM> need to be coupled to different terminals of power source. When the first annular electrode <NUM> is coupled to a positive terminal of the power source, the second annular electrode <NUM> needs to be coupled to a negative terminal of the power source. That is, the first annular electrode <NUM> is coupled to a first terminal of the battery <NUM>-<NUM> on the circuit board <NUM>-<NUM> through the corresponding first contact <NUM>-<NUM>, and the second annular electrode <NUM> is coupled to the second terminal of the battery <NUM>-<NUM> on the circuit board <NUM>-<NUM> through the corresponding second contact <NUM>-<NUM>.

In a case that the first hook-shape side electrode is inserted into the interventricular septum, it will inevitably cause destruction of the interventricular septum tissue. The interventricular septum itself will repair the damaged tissue, and usually a new layer of tissue will be wrapped around the damaged tissue. However, the new layer of tissue will reduce or even block the signal transmission between the first annular electrode <NUM> and the second annular electrode <NUM>, resulting in weak pacing signal or even failure of pacing. For this purpose, the first annular insulator <NUM> is provided with an array of apertures <NUM> near the first hook-shape side electrode, and the array of apertures <NUM> includes at least one aperture for holding a drug in the aperture. The drug in the aperture can slow down the formation of new tissue in the ventricular septum and ensure normal pacing between the first annular electrode <NUM> and the second annular electrode <NUM>. Meanwhile, as known from the above description, a plurality of groups of first annular electrodes <NUM> and second annular electrodes <NUM> exist in the present disclosure. As long as the plurality of groups of first annular electrodes <NUM> and second annular electrodes <NUM> are not completely covered, the detachable leadless pacemaker <NUM> according to the present disclosure can realize pacing. In this way, the effectiveness of pacing is greatly improved.

As can be seen from <FIG>, the first annular insulator <NUM> according to the present disclosure has a large space, and the first annular insulator <NUM> may be provided with various sensors in view of actual requirements.

In order to further improve stability of the detachable leadless pacemaker <NUM>, the second end <NUM> of the second housing is provided with at least one first positioning structure <NUM> at a side near the first pacemaker body. The first positioning structure <NUM> according to the present disclosure is shown in <FIG>. An angle of the first positioning structure <NUM> in an insertion direction is smaller than an angle in a withdrawal direction, so that the first hook-shape side electrode can be easily inserted into the compartment septum, and the first hook-shape side electrode can be locked to prevent the first hook-shape side electrode from detaching the compartment septum. Meanwhile, the second end <NUM> of the second housing extends beyond the first pacemaker body, which may reduce the pressure on a mounting catheter when implanting the detachable leadless pacemaker <NUM> to some extent. When the detachable leadless pacemaker <NUM> enters the ventricle, the second end <NUM> beyond the first pacemaker body typically first contacts the myocardial tissue (ventricular septum or other location), thus facilitating insertion into the myocardial tissue.

As shown in <FIG>, the passive leadless pacemaker <NUM> may include a second pacemaker body and a second hook-shape side electrode. The structural schematic diagram of the second pacemaker body is shown in <FIG>, and the structural schematic diagram of the second hook-shape side electrode is shown in <FIG>.

As can be seen from <FIG>, the second pacemaker body is provided with a second detachable structure <NUM>, and the second hook-shape side electrode is fixed with the second pacemaker body through the second detachable structure <NUM>. The second hook-shape side electrode is arranged in parallel with the second pacemaker body at a second predetermined distance. The second pacemaker body may also include at least one third annular electrode <NUM> (two, in <FIG>), and a third annular insulator <NUM> is provided between adjacent ones of the third annular electrodes <NUM>, and an aperture <NUM> is provided at a side near the second hook-shape side electrode. The second hook-shape side electrode may include at least one fourth annular electrode <NUM> (two, in <FIG>), a fourth annular insulator <NUM> and a second positioning structure <NUM>. A fourth annular insulator <NUM> is provided between adjacent ones of the at least one fourth annular electrode <NUM>. The third annular electrode <NUM> and the fourth annular electrode <NUM> are arranged in correspondence to enable pacing of the atria.

The second pacemaker body of the passive leadless pacemaker <NUM> may have electronic circuit being encapsulated, which is coupled to the at least one third annular electrode and the at least one fourth annular electrode, respectively, for sensing cardiac electrical signals from the fourth annular electrode and as a carrier for the at least one third annular electrode and the at least one fourth annular electrode.

It should be noted that the second pacemaker body of the passive leadless pacemaker <NUM> may not have no electronic circuit, battery and other electronic components. The passive leadless pacemaker <NUM> may receive electric energy from the battery <NUM>-<NUM> of the detachable leadless pacemaker <NUM> through the signal wires <NUM>. Thus, the structure of the passive leadless pacemaker <NUM> can be simplified and the weight of the passive leadless pacemaker <NUM> can be reduced.

The detachable leadless pacemaker <NUM> is provided with a first connection part <NUM> on the first detachable structure <NUM> as shown in <FIG>. The passive leadless pacemaker <NUM> is provided with a second connection part <NUM> on the second detachable structure <NUM>. The first connecting portion <NUM> and the second connecting portion <NUM> are used to achieve a reliable connection between the detachable leadless pacemaker <NUM> and the passive leadless pacemaker <NUM>.

<FIG> is a schematic diagram of a detachable leadless pacemaker system into the heart for cardiac conduction bundle pacing. In order to facilitate mounting, in a state that the first connection part <NUM> and the second connection part <NUM> are reliably connected, an insertion direction of the first hook-shape side electrode is opposite to an insertion direction of the second hook-shape side electrode, as shown in <FIG>. Thus, in a case that the detachable leadless pacemaker <NUM> is disposed in the atrium, the passive leadless pacemaker <NUM> may conveniently be disposed in the atrium, as shown in <FIG>.

The detachable leadless pacemaker system for cardiac conduction bundle pacing further includes a mounting wire <NUM>, the first end of the mounting wire <NUM> includes a first ring which surrounds the first curved structure of the first hook-shape side electrode of the detachable leadless pacemaker <NUM>, and the second end of the mounting wire <NUM> includes a second ring which surrounds the second curved structure of the second hook-shape side electrode of the passive leadless pacemaker <NUM>, as shown in <FIG>.

Claim 1:
A detachable leadless pacemaker system for cardiac conduction bundle pacing, comprising:
a detachable leadless pacemaker (<NUM>) with a first data interface (<NUM>);
a passive leadless pacemaker (<NUM>) with a second data interface (<NUM>); and
a signal wire (<NUM>) which is coupled with the first data interface (<NUM>) and the second data interface (<NUM>) to supply power from the detachable leadless pacemaker (<NUM>) to the passive leadless pacemaker (<NUM>), and to support communication therebetween,
characterized in that the detachable leadless pacemaker (<NUM>) comprises:
a first pacemaker body with a first detachable structure (<NUM>); and
a first hook-shape side electrode which is fixed with the first pacemaker body by the first detachable structure (<NUM>), and which is arranged in parallel with the first pacemaker body at a first predetermined distance.