Telegraphy – Systems – Printing
Patent
1981-02-13
1983-08-30
Kamm, William E.
Telegraphy
Systems
Printing
128419P, A61N 104
Patent
active
044011261
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an endocardial, implantable lead for connection with an implantable pacemaker.
Many leads of this kind have become known for transferring stimulating pulses from a pacemaker box to the heart or for supplying the heart's own pulses to the pacemaker box.
To establish reliable contact between the auricle electrode and the cardiac tissue there have been developed a great many means provided on or in the lead and being of the type of hooks, barbs and screws. These means are adapted to be actuated from outside the patient's body so as to penetrate into the cardiac tissue and carry along the electrode, thereby establishing contact with the cardiac tissue.
The disadvantages associated with such means are that they can easily damage the cardiac tissue and can also easily come loose so that the requisite reliable contact with the cardiac tissue is jeopardized.
Prior art for example, shows a curved portion of a lead having electrodes to contact the cardiac tissue. The curved portion may consist of a loop, the general plane of which includes the lead portions connected to the loop. These types of lead portions act like a leaf spring under the compressions and expansions of the heart, thereby creating a risk for injuring the heart inner wall, especially at the tip portion of the lead in contact with the heart ventricle.
The object of the invention is to provide an endocardial, implantable lead of this type, which without the aid of tissue-tearing means can establish good contact between the auricle electrode and the cardiac tissue.
This object is realized in accordance with the present invention by means of a lead of the type described in the foregoing and possessing the characteristic features that appear from the appended claims.
The invention will be described in greater detail below with reference to the accompanying drawings.
FIG. 1 is a longitudinal section of a human heart with a lead according to the invention implanted therein,
FIG. 2 is a section on line II--II in FIG. 1, and
FIG. 3 is an enlarged view of a portion (III in FIG. 1) of the lead.
FIG. 1 shows an intravascular endocardial lead 1 which is implanted in a human heart via a punctured body vessel (not shown), such as one jugular vein, and via the superior vena cava VCS (vena cava superior). It is now referred to FIG. 3 where a portion III in FIG. 1 of the lead is shown in enlargement. The lead 1 comprises two flexible helical concentrically arranged conductors 2 and 3 of some metal or metal alloy conventional for the purpose contemplated, such as a platinumiridium alloy. At its distal end the inner conductor 2 is connected to an electrode 4 in contact with the apex of the right heart ventricle VD (ventriculus dexter). At and adjacent to its distal end which is upstream of the distal end of the inner conductor 2, the outer conductor 3 is connected to auricle electrodes 5 which are spaced apart in the longitudinal direction of the lead 1 and are in contact with the inner wall, the endocardium, of the right auricle AD (atrium dexter) to receive heart pulses.
At their proximal ends the conductors 2, 3 are connectible to an implantable heart stimulating circuit adapted, in response to the heart pulses received from the electrodes 5, to generate heart stimulating pulses and transfer these generated heart stimulating pulses via the electrode 4 to the right ventricle VD. The lead 1 illustrated is thus adapted for auricle controlled heart stimulation of a human heart with partial or total AV-block.
Sheaths 6, 7 are formed about the conductors 2, 3. The inner sheath 6 embraces the inner conductor 2 from the proximal end thereof to the electrode 4 and separates said inner conductor from the outer conductor 3. The outer sheath 7 consists of a continuous portion extending from the proximal end of the outer conductor 3 to the first auricle electrode 5, as viewed from said proximal end, and of several spaced apart successive portions embracing the outer conductor 3, between which portions the other auricle electrodes 5 protrude. The last-me
REFERENCES:
patent: 3729008 (1973-04-01), Berkovits
patent: 3939843 (1976-02-01), Smyth
patent: 4057067 (1977-11-01), Lajos
patent: 4154247 (1979-05-01), O'Neill
Flocks Karl W.
Kamm William E.
Neimark Sheridan
LandOfFree
Endocardial, implantable lead for pacemaker does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Endocardial, implantable lead for pacemaker, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Endocardial, implantable lead for pacemaker will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-902194