JPS59131368A - Liquid-tight plug and header joint for implantable medical tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to coupling an electrode lead to the nozzing of a push-fit medical device, such as a pacemaker, defibrillator or cardioverter defibrillator.

In recent years, implantable medical devices have been developed as effective medical means for treating various heart diseases and arrhythmia. The device is equipped with a device that applies electrical stimulation for heart disease, arrhythmia, and arrhythmia. Commonly known devices of this type include pacemaker defibrillators, cardioverter defibrillators, etc. These devices feature implantable electrodes for contacting or counting the heart, electrical circuitry within the housing, and electrode leads connecting the electrodes to the nosing circuitry.

Because these entire electrodes, electrode leads, and housings are all implanted within the body, the fittings of the electrodes 1)* are important for the integrity of the electrical connection and the electrical circuitry within the housing.
15 degrees Celsius is properly sealed to prevent liquids (including gases) from seeping into the body.

Implantable precept 1f like an automatic defibrillator! A typical lightning coupling arrangement for an i ml device is disclosed in U.S. patent application Ser. It is described in Yu No. 673. These coupling devices are made of biologically inert, non-conducting materials, are integrally formed with the lid of the cardiac stimulator casing, and have terminal holes in the header for receiving the terminal plugs of the lightning and pole leads. A coupling or header with a The terminal plug of the electrode lead can be inserted into a conductive fitting in the header and secured therein with a screw.

Electrode fittings for many-core 1ift'-smanufacturers are disclosed in U.S. Pat.
It can be seen in No. 2 and '1.022 Otsu 7g.

Recent advances in cardiac stimulators have led to the development of implantable IT that can sense the condition of the heart and provide stimulation to the heart in various modes of operation. Such modes of operation include a heart rate regulation mode, a cardioversion mode, and an autologous defibrillation mode. One such multi-mode cardiac stimulator is by the same applicant /9g2/February/
A special application for application on the same day! t7-! ; Shown in No. 0i100. Such multimode devices generally require multiple awts with multiple electrode leads. For example, the cardiac stimulator discussed above requires an atrial rate-regulating electrode, a ventricular rate-regulating electrode, a pair of defibrillator electrodes, and a pair of heart rate-sensing electrodes. It is said that In this way,
It is necessary to connect the six electrodes of the six electrode leads to the housing containing the frost circuit of such a multimode device.

The present invention relates to fluid-tight plugs and header fittings for implantable medical devices. The present invention is particularly useful in multimode implantable cardiac stimulators that are implanted within a patient's body and must connect multiple electrode leads to electrical circuitry within the housing.

As will be appreciated, the convergence of the electrode leads can be varied for a number of modes of operation of the implantable medical device.

The present invention includes a housing having a casing internally containing electrical circuitry that senses and activates the movement of the patient's heart. The header, which is made of electrically and electrically non-conducting material and does not react with body fluids, is molded integrally with the casing, preferably with the casing lid.

The header includes a facsimile terminal, such as a female terminal fitting, connected to the circuitry of the housing by a feedthrough. The electrode lead is connected to a plug that includes an electrical terminal, such as a male terminal member coupled to a female terminal of the header. In seven preferred embodiments of the invention, λ plugs, each connected to three electrode leads, are provided to be coupled to the header. As is clear, 1! The number of plugs can be increased or decreased from this depending on the conditions of the 4 FIJ-domain, the space requirements and, of course, the number of crop modes of the implantable device.

The plug and header have a complementary sealing surface with a QIJ seal disposed around the terminal fitting to seal the terminal connection and the interior of the casing from surrounding body fluids.

Threaded fittings are used to ensure a secure connection between the plug and the header. A screw whose shaft extends through the plug is threaded into a screw socket disposed within the header. The screw head is of sufficient diameter so that at least a portion of the screw head substantially overlaps the connection between the plug and the header terminal. - This causes the compressive force to be vectored substantially in alignment with the male and female terminal fittings. This aligned force vector provides a positive but releasable coupling between the plug and header.

It is an object of the present invention to reliably connect the electrode lead to the casing in the most approximate manner. Generally, the i8' pole is first implanted within the patient's body and is secured to the casing at the proximal end of the electrode lead during surgery. Therefore, when there are multiple lightning bolts and pole leads, it is necessary to quickly connect the 1' pole lead and the casing without particularly requiring a complicated connection procedure.

Another object of the invention is to use a minimum number of parts,
The purpose is to reliably connect the electrode lead and the casing.

In the present invention, only seven mounting members are provided for each plug. This simple attachment member provides a secure mechanical connection of the multi-electrode lead to the casing.

Another purpose of this invention! The object of the present invention is to provide an electrical coupling device that isolates the connection between the pole board and the circuit inside the casing from the external environment.

This secure fitting prevents leakage and corrosion of leaky fluids that meet the conductivity of the connection, thereby allowing easy removal of the plug from the casing should it become necessary to repair the plug. can be done reliably.

Another object of the invention is to connect multiple electrode leads to a casing in a relatively compact space. As the number of electrode leads increases, the leads must be thick enough to connect to the casing without perceivably increasing the dimensions of the casing. The available space is maximized so that a plurality of electrode leads, six or more, can be coupled to the casing without any problems.

Other objects and advantages of the invention will become more apparent upon reference to the following detailed description and accompanying drawings.

The present invention consists of a push-in medical device 1 that stimulates the heart of a caregiver. This implantable medical device has a housing 3 consisting of a casing 5 and a header 7.

An electrical circuit 9 is disposed within the casing, which operates with respect to the patient's heart and/or with a plurality of operating modes.

The header 7 is made of an electrically non-conducting and biologically non-reactive material and is preferably formed integrally with the lid 12 of the casing 5.

The header 7 includes an electrical terminal 11, illustrated as a female terminal, extending into the header from the header face, the terminal 11 being coupled by an electrical feedthrough 13 to the casing 5.
It is connected to the internal sushi and air circuit 9. The header 7 further comprises a plug attachment socket 15 for connecting each plug 17 to the header 7. The pair of plugs 17 are shown with male terminal pins 19 extending from the plug sealing surface 21 and engaging the female threaded terminals 11 of the header 7.

Each plug 17 is provided with a screw 23 that screws the plug 17 to the header 7 in a positive but releasable manner. T1 inside. The pair of cables 25 with the cables 27 connected thereto are connected to the plugs 17. The electrode lead 27 is attached to the male terminal.

The casing 5 has a bottom part 10 and a lid part 12. The casing 5 houses an electrical circuit 9 suitable for operation on the patient's heart according to/or multiple modes of operation. Electric circuit 9 arranged inside the casing
is a heart rate regulation, cardioversion and/or defibrillation circuit. For example, the electrical circuit 9 to be housed in the housing is disclosed in the above-mentioned Japanese Patent Application No. 0110 filed by the same applicant.
0/g2, or the above-mentioned Japanese Patent Application No. 9a da 77/gθ and U.S. Patent No.
This is an automatic defibrillation circuit described in No. 73. As described in such patent applications and patents, the casing includes an inner casing (not shown) hermetically sealed from the external environment.
It is equipped with The casing lid 12 is the casing body 1
0 to form an airtight sealed chamber. The casing 5 is preferably made of titanium to ensure non-reactivity to body fluids and gases at the implantation site.

Mounted on the casing 5 is a header 7, preferably made of a molded plastic such as epoxy, polyurethane and/or plastic, a material that is non-conducting and generally non-reactive to body fluids. . It is desirable that the header 7 be directly molded onto the casing, particularly the casing lid 12, and integrated therewith.

The header 7 has dimensions that match the dimensions of the casing lid 12 by t. The header 7 is substantially planar and is provided with a sealing surface 29 adapted to engage the plug sealing surface 21 in a manner to be described later.

The header face 29 and plug face 21 are sealed to prevent the build-up of internal fluids which could harm the terminal connections and the circuitry within the casing, as will be described below.

A plurality of electrical terminals 11, such as female sockets 31, which are electrically conductive, are disposed within the header 7 and molded therewith (the sockets are in the embodiment shown in FIGS. 1 and 5). (There are two).

The material of the socket is preferably titanium. The female socket 31 has a substantially cylindrical cross section and forms a female socket hole 33 into which the male terminal pin 19 of the plug 17 can be securely fitted. Each female socket hole 33 opens to the outside of the header 7 through a hole in the header. The socket hole 33 does not extend over the entire female terminal block;
It ends at forming a bottom portion 537. bottom part 3
7 is an electrical feedthrough 1 by a method explained later.
Supported by 3.

Female sockets in headers can be of roughly two types. The first type (FIG. 7) is a socket 31 whose circumference is a substantially continuous annular cylindrical portion. Due to the socket, the male terminal branch 19 of the plug 17 is bifurcated at 39, that is, into a fork shape, and the male terminal branch 19
Its cross-sectional diameter is somewhat larger than that of the socket 31 so that when inserted into the female socket, the λ fork portions of the male branch are deflected towards each other and a secure connection is established.

The third embodiment of the socket (Fig. S) is the socket 31'.
The cylindrical portion is divided to form leaf-like portions 32. In the overcast embodiment, the split leaf portion 32
The cross-sectional diameter of the male terminal branch 19' is larger than the hole 3 formed by the split lobes 32, so that spring deflection can occur when the male terminal plug 19 is inserted therein.
It is somewhat larger than 3'. As is clear from this embodiment, the lobes 32 of the socket 31' are arranged such that the lobes 32 of the socket 31' can move somewhat outwardly radially when the male terminal branch 19' is inserted therein.
It is necessary to arrange it at a slight distance from the hole 35' formed by the header 7. Further, according to this embodiment, the split leaf portion 32 of the female socket) 11' is a branch body 19'.
It should also be understood that the open end thereof may be provided with an annular lip or ridge (not shown) to provide a camming surface for the cam.

Electrical feedthroughs 13 connect terminals 11 in header 7 to box air circuit 9 in the casing. This feedthrough 13 includes a plug 4 having a central opening inside.
1 is provided. Plug 41 is made of an electrically insulating material, such as a ceramic material. The plug 41 includes a cylindrical shaft portion 43 that extends through the casing lid 12 and into the casing interior. Ceramic plug 41
are stepped to provide a support surface 45 for a flange 47 molded into the header 7. The 7-lanzo 47 includes a shaft portion 49 extending into the casing. The electrically conductive flange 47 is preferably titanium.

An electrical wire or vial 51 is provided to pass through the center of the ceramic plug 41 and support the seven lanterns 47. The vial 51 may be fixed to or integrally formed with the base 37 of the acid socket 310. I can do it. The ceramic plug 41 provides a tight seal to prevent liquid from flowing into the casing.

The electrically conductive wire or pin 51 is W-connected to the tp circuit in the casing 5, or alternatively,
It can be connected to an additional electrical supply located within the inner casing (not shown). Lightning inside the inner casing,
Pneumatic feedthroughs are described in the applicant's above-mentioned patents and patent applications.

Mounting sockets 15 into which the additional screws 23 are fitted are arranged at substantially the same distance from both sides of the header 7 and at substantially the center of the three female sockets 31. The socket 15 includes a metal cylindrical member 55 that has a threaded interior and is integrally formed with a base 57 that is fixed to the lid 9 of the casing. The threaded socket 15 follows the header sealing surface 29 and communicates with the outside of the header. The threaded cylindrical socket 15 can be operated to receive a threaded screw 23 in a manner to be described later. Alternatively, instead of the threaded cylindrical gold fH socket 55, the molded plastic walking header 7 can itself form a threaded socket into which the screw 23 can be fitted.

As shown in FIGS. 1 and 3, the header 7 includes six electrical terminals 11 and one threaded mounting socket 15. Such a header assembly is such that each plug 17 has seven male terminals and one threaded fitting 23 (i(i
It is designed to be coupled with a pair of plugs 17.

Electrical terminal 11 and threaded mounting socket 15 are positioned for alignment with mating plug 17 in a manner described below.

It should be noted that it is also possible to use two separate headers instead of one header made of a mold disposed substantially across the entire top surface of the casing lid 12. Additionally, pairs of plugs 17 can be combined to form seven elongated plugs.

Plug 17 is similar in material to the header and includes a plug housing 59 made of molded plastic material. That is, the plug housing 59 can be made of epoxy, polyurethane, or other materials that are biologically non-reactive and non-conducting.

The plugs shown in Figures 1 and 3 (F:, each plug 17
is approximately rectangular in shape, and its four molded parts are joined to cable 25 by a method to be described later.

Each plug 17 has two parallel flat surfaces, a sealing surface 21 and an exposed surface 22. This outer surface 22 is counterbored at 61 to accommodate the head of the mounting screw 23. The sealing surface 21 is geometrically shaped in a complementary relationship with the sealing surface 29 of the header disposed directly below it.

A plurality of plug terminals 19 are embedded within each plug 17. As shown, the plug terminal 19 is a male terminal plug forming a pin or branch 63 and extending generally perpendicularly from the plug sealing surface 21.

The male pin 63 is adapted to fit into the female socket 31 of the header terminal 11. (Obviously,
The terminals can be reversed so that the header terminal 11 has a male pin and the plug terminal 19 has a female socket. ) As mentioned above, the shape of the male terminal branch varies depending on the particular socket implementation. In the case of a substantially continuous threaded socket 31 as shown in FIG.
3 may be provided with a slot 39 extending axially from the free end of the branch and forming seven pairs of branch forks. When the male branch 63 is inserted into the socket 31, the diameter of the male branch should be somewhat larger than the diameter of the female socket so that the branch fork is biased inward and can be securely connected to the female socket. be.

Alternatively, as shown in FIG.
'Haha+t+Although it is a fruit, the leaf-like part of the socket 3
2 is enlarged so that it can mate with a split female socket 31' to provide a strong spring-biased connection.

The plug terminal 19 inserted into the plug 17 is connected to the wire 27 of the electrode lead. The connection between the electrode lead wire 27 and the plug terminal 19 can be made by conventionally known means. For example, as shown in Figure λ, the plug terminal 19 has a generally circular cross section and includes a mounting head 65 having a radial opening for fitting the wire 27 of the electrode lead. The connector can be resistance welded to the head 65 of the plug terminal. Another method is to place i1 around the plug terminal.
127 can be wound or the plug terminal can be of a collapsible structure so that the electrode lead wire 27 can be crimply connected to the plug terminal 11. It will be obvious that the plug terminal 11 is connected to the electrode lead wire 27 E4 in the molding 13tl of the O plug 17, any other connection method can be used if it is suitable and reliable.

(Electrode lead: The spring 27 is available in four colors, and its distal end (not shown) is inserted into a suitable implanted electrode.
(The cable 25 is disposed inside the cable 25.The sheath of the cable 25 is fixed to the plug 17, preferably molded together with the plug 17.As mentioned above, the present invention is applicable to the Japanese IN
The multi-mode system disclosed in patent ode No. 0i100/zaλ
It is particularly useful in a set of cardiac stimulators, in which case six electrode leads are particularly effective.

Of course, the number of electrolyte leads will vary depending on the particular operating requirements of the implantable device.

A fitting for attaching the plug 17 to the header 7 is provided approximately at the center of each plug 17.

The fitting has a screw 23, preferably of gold Jl, with a threaded shaft 69 with threads along the thread 11 67 and on the bottom 71 of the shaft.
Fi & getting it. The screw 23 fits into a central hole 61 with a counterbore surface 73 in the plug as the itl exit surface 22.

Screw 3i (1,:'s 67 is the screw head screw head 2 for driving the screw 23 into the threaded socket 15 of the header 7.
3 is sized such that this screw head 23 lies over each terminal connection between the plug and the header. (See Figure 1) This allows the header socket 15
The compressive force between the plug and the header is maximized when inserting the screw 23 therein. Measure the diameter of the screw head 23 between the head and the plug! By positioning the plug terminal 19 above the +8
Furthermore, compressive force vectors that are nearly matched are obtained between the other socket terminals 11. By providing such a relatively large diameter screw head, each plug and header r
To obtain a positive fit in +J, there are only seven threaded connections; the screw head 23 has a nearly flat head so that it engages flat within the generally flat exposed surface of the plug. Part surface 77
As shown, the flat exposed surface 23 of the bladder has a counterbore portion 73. A generally flat head surface 77 of screw 23 engages an exposed surface of counterbore portion 73.

The screw shaft 69 is sealed with a plug hole 61, through which the shaft passes.

This provides fluid communication around the screw head 23 and through the plug hole 61 from outside the device μ and prevents fluid communication into the terminal connections or inside the casing. screw shaft 69
and the hole between the plug hole 61 is a circle of screw 11 +I+,
Duplicate placed on the same page? This is done by a saving O-ring seal 79. Preferably, the O-ring 79 is formed integrally with the plug 17 and formed as a part of the plug. Alternatively, the plug hole 61 can be formed with a single round slot within which an OIJ song enclosure can be positioned.

Seals are also used between the plug and header and their respective opposing sealing surfaces 21,29. On the circumference of each male terminal fitting, another OIJ song 1 is self-thrown from the outside of the device to prevent liquid from leaking into the terminal fitting. ing. As shown in the drawing, O-ring m
The DI body is integral with the plug and extends from the plug sealing surface 21 to the m11 surface 29 of the header to provide a reliable seal. Alternatively, the O-ring N Xt body can be formed integrally with the header.

Additionally, another O-ring may be placed in a circumferential slot located in either the plug sealing surface or the header sealing surface.

In addition to the O-ring around each terminal fitting, another OIJ song seal 83 is provided around the periphery of the plug sealing surface 210, preferably integrally with the plug sealing surface.

This serves as an auxiliary sealing means, further ensuring that body fluids are prevented from leaking into the terminal connection and into the interior of the casing. The O-ring 83 disposed around the periphery of the plug sealing surface can likewise be disposed within the sealing surface of the header. Additionally, another O-ring can be disposed within the slot formed by either the plug or the sealing surface of the header.

Above, specific embodiments of the invention have been described. However, it should be understood that these modes of implementation are provided for illustrative purposes only and are not intended to limit the scope of the present invention.The intent of the present invention is not limited by the above description. Rather, it is as described in the claims.

[Brief explanation of drawings]

fl /The figure shows the embedded type fixed to the header of the ID device/
FIG. 3 is a plan view of a pair of electrode plugs. FIG. 2 is a front view of the plug and header joint device; FIG. 3 is an exploded perspective view of the plug and header joint. Figure 1 is a detailed view of an electric and female electric chanter according to the 61st aspect of the present invention; Figure 1'iI1. Figure S is a detail A411'IJ of the vertebrae and female power terminal according to the second embodiment of the present invention. l...Embedded medical device 3...Housing 5, -, Casing 7...Header 11...Header upper part 9
...Electric circuit 1! ...+-Ging Chita lO
...Bottom part 13...Supply Ron ゛tsu'・15
...Mounting socket 17...Plug 19...Plug 1 Child drawing 3 (no change in content) FIG, 2 Procedural amendment (method) Commissioner of the Patent Office Kazuo Wakasugi 1, of the case Indication Patent Application No. 1624'18 3 of 1980, Relationship with the case of the person making the amendment Applicant Name Miesocyslaw Mirowski 4, Agent 5, Date of amendment order January 31, 1980 Engraving of the drawings (No change in content).

Claims (1)

[Scope of Claims] /) A medical device that can be implanted in the body of a caregiver and electrically stimulates the heart of the caregiver, and l) An internal Qi circuit that stimulates the heart of the caregiver. a casing 111u formed of an electrically insulating material integral with the casing and forming a substantially planar header sealing surface, the header being disposed within the header and extending from the header sealing surface. a plurality of electrical conductor header fittings, means for electrically connecting one terminal of the header to an air-impact circuit device within the housing, and a threaded socket threadably engaged with the mounting screw and extending from the header sealing surface. and the medical device further includes a plug made of a tortoise-proof material forming a generally flat plug sealing surface and a generally flat exposed surface, the plug extending from the plug seal and facing the said plug. a plurality of electrical conductor plug terminals disposed in a fluid replenishing relationship with the header terminals, a means for electrically connecting the plug terminals to the electrode leads; forming said plug sealing surface and said 4
a plug hole extending between the protrusions and a mounting screw, the mounting screw being positionable through the plug hole;
a screw shaft threadably engageable with the threaded socket of the header, and a screw head that engages the flat exposed surface, the screw head firmly screwing the screw shaft into the threaded socket of the header. dimensioned to at least partially overlie each of the plug terminals to provide a force vector substantially aligned with each of the plug terminals and the complementary header screw when mated; The medical device includes a plurality of electrode leads that are connectable at one end to an implantable electrode that cooperates with the patient's heart and that extend within the plug and are in contact with the plug terminal. 1ti outside of the combined header terminal and plug terminal! 1. A medical device comprising: a sealing means disposed between said header sealing surface and said plug sealing surface to prevent fluid communication from said header sealing surface and said plug sealing surface. 2) a plurality of said sealing means each disposed about every inch of the engaged header and plug terminal and extending between the header and the plug sealing surface; A medical device according to claim 1, characterized in that it comprises a ring seal. 3) Said sealing means is further disposed all around the mutually engaged header and plug 5'''', 1J and adjacent to the periphery of the plug sealing surface, and said sealing means Claim i: JJi6, characterized in that it comprises seven O-ring seals extending between the surfaces.
=Medical equipment listed in Section 2. 542. The medical device of claim 542 or 3, wherein the O-ring seal is integral with the plug sealing surface and engages the header sealing surface. Claim 7, wherein each header 1 screw is provided with a female socket made of an electrical conductor that extends from the header sealing surface and has a socket hole into which a plug terminal is fitted through the header sealing surface. Medical equipment listed in section. B) The means for electrically connecting the header terminal and the electrical circuit device comprises a plurality of feedthroughs each cooperating with a female socket, each feedthrough extending through the header and into the interior of the casing. an insulating member that supports the female socket; and a conductor wire that is connected to the female socket and extends inside the casing through the colored edge member and is connected to the electric circuit device. The medical device described in claim 5. W) Each of the feedthroughs further includes seven electrically conductive langes supporting the one-color edge member, and one of the seven langes is attached to the casing. Medical equipment listed in paragraph (B). g) each said plug terminal comprises an electrically conductive pin extending from said plug sealing surface so as to be able to pass through a captive separate socket in said header; The medical appliance described in Scope 3. c) The female socket hole is formed by a split spring socket leaf, and the diameter of the socket hole is 1.
] Hongki, 1i: The medical device as set forth in claim g, characterized in that the diameter is smaller than the diameter of the male pin so that it can be held securely within the socket. 10) The diameter of the forked male pin is adjusted such that the auxiliary pin has a slot extending along the pin axis to form a forked male pin to securely hold the male pin within the female socket. The medical device according to claim 7, wherein the diameter of the female socket hole is smaller than the diameter of the female socket hole. //) The means for electrically connecting the plug terminal to the electrode lead includes an electrode lead fjfJ in each of the S♂ pins.
Claim 3, characterized in that the mouth part is hIV, and the 'tJi pole lead is inserted into the lead opening at the pin fitting part with the plug and attached to the bottle.
515 medical equipment listed in section. /2) The means for electrically connecting the plug terminal to the electrode lead includes a retractable receptacle that connects to and extends from the semi-pin, and mechanically connects the electrode lead to the retractable receptacle. That it stopped shrinking*! I, Claim No. Medical 7 dormitory equipment listed in section r. /3) further comprising a shaft seal to prevent fluid from flowing from the outside of the medical device through the plug hole;
: X instrument as described in claim 1, which is a Φ characteristic. /ri) The shaft sealing means comprises an O-ring seal disposed circumferentially between the mounting screw shaft and the wall of the plug hole. Medical blasphemy equipment. /3) The 01J ring seal is integral with the wall of the plug hole and extends in the inner axial direction to sealingly engage the mounting screw shaft;
Doctor mentioned around: Dormitory 1. : Ingredients. /6) The screw socket is inserted into the header so that the mounting screw can be screwed into the header.
4. The medical device according to claim 4, characterized in that it has a semi-screw socket. /7) The 'screw receiver 1' is electrically supported on the socket base of the groove body, and the socket base is attached to the casing! i'+ rF Claim 1
l'W described in Section B? 2 instruments. 7g) The medical device of claim 1, wherein the mounting screw head includes a generally flat head surface for flush engagement with a generally flat exposed surface of the plug. /q) counterboring the flat exposed surface of the plug;
A medical device as set forth in Items 1 and 1ii2 of the scope of Patent No. 1, characterized in that a flat seat into which the flat head surface of the screw head fits is obtained. -〇) Is there an electric circuit E+ that is implanted in the body of a caregiver and electrically stimulates the caregiver's heart circle A? J 434 Jli recommended, a housing having a sealed surface from which an electrical terminal extends, and a housing connected to an electrode lead for implantation within a patient's body and having a portion of the sealed surface of the housing. a plug having a complementary shaped plug sealing surface for mating and sealing engagement therewith, the plug having an electrical terminal extending therefrom for engagement with the electrical catch of the housing; and a sealing means for liquid-tightly sealing between the sealing surface of the housing and the plug sealing surface, and mounting means for reliably and releasably attaching the housing to each of the plugs. The above-mentioned medical device characterized by: , 2/) The medical device according to claim 20, wherein the attachment means comprises a screw. , 22) the screw has a screw head, and at least 7 portions of the screw portion substantially overlap the engaging electric terminals E (4 elements) of the plug and housing, and a pressure 28. The medical device according to claim 27, characterized in that the live sealing means applies an OIJ song: 5'J between the sealing surface of the housing and the plug sealing surface. A medical device according to claim No. a0, which is characterized in that: , 21I) Said sealing means is arranged around the d-air terminal connection, 7"1irJ, of each plug and housing.
21. The medical instrument as set forth in claim 20, wherein the ring is rotated by t+fif as the '1 de sign.