EP4633704A1

EP4633704A1 - Port cannula being adjustable by rotation

Info

Publication number: EP4633704A1
Application number: EP23821297.1A
Authority: EP
Inventors: Oltjon DIMNI
Original assignee: Fresenius Kabi Deutschland GmbH
Current assignee: Fresenius Kabi Deutschland GmbH
Priority date: 2022-12-13
Filing date: 2023-12-11
Publication date: 2025-10-22
Also published as: WO2024126339A1

Abstract

A port cannula (1; 1') for puncturing a port (2) comprises: a housing (10; 10') and a needle (11) having a tip (110), wherein the housing (10; 10') comprises a first part (100; 100'; 100'') and a second part (101; 101') rotatable with respect to one another to adjust a distance (L1, L2) of the needle (11) tip (110) to the housing (10; 10').

Description

Port Cannula Being Adjustable by Rotation

Description

The invention relates to a port cannula for puncturing a port and to a method for adjusting the port cannula.

Port cannulas are used for puncturing implanted port catheters. An implanted port catheter, in short also referred to as port, is arranged under the skin of a patient and typically defines a volume covered by a membrane. The volume of the port is connected to a catheter that opens into a vessel or other treatment site. To administer a liquid into the port, a port cannula with a needle is used. The needle is pressed through the skin of the patient and through the membrane into the volume so that the liquid can be filled into the volume of the port and, thereby, administered to the patient.

Such a port system is described in US 2013/0226103 A1.

Depending on weight and size of the patient, the thickness of the tissue covering the implanted port may differ strongly. Therefore, commonly a cannula with a correct needle length must be selected before the application. The needle length is selected to be just long enough to reach the volume of the port and at the same time allow a connecting piece of the port cannula to be in contact with the patient’s skin to be secured thereto.

Due to the wide range of weights and sizes of the various patients, hospitals typically have to store a significant number of different needle lengths, e.g., six different lengths. Since regularly also different needle diameters may be applied, e.g., three different diameters, a large number of different port cannulas may have to be kept in a storeroom. In addition, the manufacturing of the port cannulas is complex, because the various different combinations of needle diameters and lengths need to be made.

It is an object of the instant invention to provide an improved port cannula.

This object is achieved by means of a port cannula comprising the features of claim 1.

Accordingly, a port cannula for puncturing a port is provided, comprising a housing and a needle having a tip. Therein, it is provided that the housing comprises a first part and a second part rotatable with respect to one another so as to adjust a distance of the needle tip to the housing.

This is based on the idea to replace a large number of cannulas with different needle lengths by just one type of an adjustable port cannula (per needle diameter). Using a rotation of two housing parts, e.g., instead of a pure translatory motion along the axis of the needle, avoids an accidental adjustment while puncturing an implanted port. Thus, an improved port cannula is provided. The port cannula is adjustable by rotation. A port system may be provided that comprises the port cannula and the port.

Optionally, the needle is fixed to a needle mount. The needle mount may be movably, in particular slidably, mounted with respect to the first and/or second part. This allows a simple and reliable adjustment of the needle.

One of the first part and the second part may comprise a thread. For example, the thread is engaged by the needle mount, e.g., by one or more projections thereof. By this, an intuitive and smooth adjustment of the needle is possible.

The first part may comprise a base and/or a plate. The base and the plate may be movable with respect to one another. For example, the plate may be adjusted along an axis with respect to the base. The axis can be parallel to the needle. This allows a setup with a comparably short housing which does not protrude much from the skin when applied. The needle may be arranged so as to extend through the base in at least one configuration. Optionally, the base and the plate are connected with one another by means of an elastic element, e.g., in the form of a spring. By this, the adjustment of the base and plate can be improved.

Optionally, the elastic element is pretensioned to push the plate in a direction away from the base. Thereby, the adjustment against the pretension can be simplified while assuring a safe initial state by the pretension.

The needle may be fixed to a needle mount, wherein one or more cords connect the needle mount with the plate. The needle mount may be fixed to the second part of the housing. Thus, by pulling the one or more cords, the distance between the base and the plate can be adjusted particularly simple.

The port cannula may further comprise a cord retraction mechanism. For example, the port cannula comprises a winch. Therein, the one or more cords may be woundable on the winch by rotation of the first part relative to the second part. This allows a very simple adjustment.

Optionally, in an initial state, the needle tip is arranged (e.g., at least partially, in particular completely) inside the housing. By this, a separate needlestick protection may be obsolete. It may be provided that rotation of the first part and the second part with respect to one another moves the needle tip out of the housing, or an element of the housing relative to the needle, e.g., to protrude from the housing.

The port cannula may further comprise a scale. The scale may be provided on the housing. Therein, rotation of the first part with respect to the second part may affect an adjustment of an indication of the distance of the needle tip to the housing on the scale. This allows to precisely adjust a desired length in an easy manner.

The port cannula may further comprise a locking element. The locking element may have an unlocking state and a locking state. The locking element, e.g., is adapted for locking the first part and the second part with respect to one another in the locking state. This prevents an unintended adjustment.

Optionally, the locking element is a protrusion of one of the first and second parts. The locking element may be configured for engaging a receptacle of the other one of the first and second parts in the locking state. This allows a simple but reliable locking. The first and second parts may be rotatable with respect to one another about an axis of rotation. Alternatively, or in addition, the locking element can be brought into the locking state by a translatory motion of the first and second parts relative to one another. The translatory motion may be parallel to the axis of rotation. This allows a simple and intuitive adjustment.

One or more strips, in particular one or more adhesive strips, may be mounted on the housing, e.g., on the first part of the housing. The adhesive strips may be fixed to an end of the first part. The one or more strips may be flexible. The one or more strips may be configured to fix the port cannula to the skin of the patient. Alternatively, or in addition, the strips may be configured to enclose the needle. For example, the strips may be configured to be fixed to one another by means of the adhesive. This allows a needlestick protection and a little length of the port cannula as the needle tip may protrude from the housing.

The port cannula may further comprise a ratchet. The ratchet may be adapted for providing haptic and/or audible feedback to a rotation of the first part with respect to the second part. This provides a particularly intuitive and simple adjustment of a desired length.

According to an aspect, a method for adjusting the port cannula according to any embodiment described herein is provided. The method comprises the following steps: providing a predetermined distance of the needle tip to the housing; and rotating the first part with respect to the second part until the distance of the needle tip to the housing corresponds to the predetermined distance. For the effects and advantages, reference is made to the description of the port cannula above.

The idea underlying the invention shall subsequently be described in more detail by referring to the embodiments shown in the figures. Herein:

Fig. 1 shows an implanted port catheter;

Figs. 2A-2C show an adjustable port cannula for puncturing the port catheter according to Fig. 1 , wherein the port catheter comprises two parts rotatable with respect to one another;

Fig. 3 shows a cross-sectional view of the port catheter according to Fig. 2A;

Fig. 4 shows a cross-sectional view of a port cannula for puncturing the port catheter according to Fig. 1 ; and Figs. 5A-5C show a part for the port cannula of Figs. 2A-3 having adhesive strips.

Subsequently, port cannulas for puncturing a port shall be described. The embodiments described herein shall not be construed as limiting for the scope of the invention.

Fig. 1 shows an implantable port catheter, in the following referred to as port 2. In Fig. 1 , the port 2 is shown in a state implanted under the skin 3 of a person. The port 2 comprises a housing 20 which defines an interior volume 21 . A membrane 22 of the port 2 closes the volume 21. The volume 21 may also be referred to as infusion chamber. A catheter 23 is attached to the housing 20 and in fluid connection with the volume 21. The catheter 23 establishes a connection of the port 2 to a tissue, for example a vein. In order to give a patient a medicament that is to be administered intravenously, for example, the membrane 22 is pierced via the skin 3 by means of a port cannula. The port cannula establishes the connection between the infusion chamber volume 21 formed in the housing 20, e.g., to an infusion bag. As an example, a port catheter like the port 2 shown in Fig. 1 can have an implantation time of up to 5 years. Accordingly, the port 2 may be punctured often by a port cannula. The membrane 22 is made of a suitable material, e.g., silicone.

Figs. 2A-2C and 3 show an adjustable port cannula 1 for puncturing the port 2 of Fig. 1. Together, the port cannula 1 and the port 2 form a port system.

The port cannula 1 comprises a housing 10 and a needle 11 with a tip 110 at its end. The tip 110 is sharpened. The tip 110 has an inclined end surface. This allows to smoothly pierce through the membrane 22.

The housing 10 comprises a first part 100 and a second part 101. The first and second parts 100, 101 are rotatable with respect to one another so as to adjust a distance L1 , L2 of the needle 11 tip 110 to the housing 10. While Fig. 2A shows the needle 11 arranged fully retracted inside the housing 10, Fig. 2B shows the needle 11 arranged partially outside the housing 10, and Fig. 2C shows the needle 11 extended even further outside the housing 10.

According to Fig. 2B, the tip 110 of the needle 11 is arranged in a first distance L1 to the housing 10 (here, to an end face of the housing 10). According to Fig. 2C, the tip 110 of the needle 11 is arranged in a second distance L2 to the housing 10 (to the end face thereof). The second distance L2 is larger than the first distance L1. In the Example of Figs. 2A-2C and 3, the first and second housing parts 100, 101 are generally cylindrical. The first and second parts 100, 101 each have a circular cross-section. The first and second parts 100, 101 can be rotated with respect to one another about an axis of rotation R. The axis of rotation R is coaxial to the cylinder axis of the first part 100 and the second part 101 of the housing. Also, the axis of rotation R is parallel (more specifically coaxial in this example) to the elongate needle 11. The needle 11 is adjustable relative to the housing 10 along its longitudinal extension. Thus, the needle 11 is adjustable relative to the housing 10 along the axis of rotation R.

The port cannula 1 further comprises a scale 15. The scale 15 indicates the distance L1 , L2 of the tip 110 of the needle 11 to the housing 10. For example, the scale 15 indicates 0 mm in Fig. 2A, 10 mm in Fig. 2B and 20 mm in Fig. 2C. The scale allows an easy adjustment of the correct distance. For example, the scale 15 comprises a transparent area, e.g., a window. The transparent area may be fixed to the second part 101. The scale 15 may indicate the current needle length in centimeters and/or in inches.

Arrows depicted on the first and second parts 100, 101 indicate the rotational position of the first part 100 relative to the second part 101. As shown in Fig. 2A, the two arrows are aligned with each other in the retracted state of the needle 11.

In use, e.g., the port cannula 1 is initially provided with the needle in the retracted state as shown in Fig. 2A. The needle 11 tip 110 is protected inside the housing 10. The first and second parts 100, 101 are then rotated until the scale 15 indicates a given distance. Then, the port cannula 1 is punctured through the skin 3 into the volume of the port 2. The port cannula 1 may then be fixed to the patient’s skin 3, e.g., by means of tapes. Optionally, the port cannula 1 comprises a flange at its front end for fixation.

Fig. 3 shows the needle 11 being fixed to a needle mount 12. The needle mount 12 is slidably mounted, in general with respect to the first and/or second part 100, 101 , in this example with respect to the second part 101. For this purpose, the needle mount comprises at least one guide 121, in this case two guides 121 , each of which being engaged by a protrusion of the second part 101. Each of the guides 121 is a linear groove. The guides are formed at an inner side of the second part 101 . The guides extend in parallel to the axis of rotation R. Thus, the needle mount 12, together with the needle 11, can be translated along the rotational axis R with respect to the second part 101 of the housing 10. The first and second parts 100, 101 are engaged with one another by means of a thread 102. Here, the thread 102 is formed at an inner surface of the first part 100 of the housing 10 as an example. The thread 102 is engaged by the needle mount 12. Specifically, protrusions 120 of the needle mount 12 engage the thread 102. Thus, in a rotation of the first and second parts 100, 101 of the housing 10, the needle mount 12 is rotated with respect to the first part 100 of the housing 10 together with the second part 101 of the housing 10. This rotation leads to a movement of the protrusions 120 of the needle mount 12 along the thread 102. Thereby, the needle mount 12 is displaced along the axis of rotation R, so that the needle 11 is moved out of the housing and a distance of the needle 11 tip 110 to the (most adjacent part) of the housing 10 is increased. While Fig. 3 shows an initial state in which the needle tip 110 is arranged inside the housing 10, rotation of the first part 100 with respect to the second part 101 arranges the needle tip 110 out of the housing, e.g., as shown in Figs. 2B and 2C).

The needle 11 is in fluid connection with a hose 19 for supply with a medication or the like.

The housing 10 further comprises ratchet 18. The ratchet 18 can be provided for generating haptic and audible feedback to a rotation of the first part 100 with respect to the second part 101 .The ratchet 18 is arranged between the first and second parts 100, 101 . The ratchet may be configured to allow rotation in one direction and prevent rotation in the other direction (e.g., with saw teeth).

In a method for adjusting the port cannula 1, first a predetermined distance of the needle 11 tip 110 to the housing 10 is provided. For example, this distance (which could also be referred to as needle length) is determined based on weight and size of a patient, and/or based on a measurement or estimation of a thickness of the skin 3 of a patient.

As a second step, the first part 100 is rotated with respect to the second part 101 until the distance of the needle 11 tip 110 to the housing 10 corresponds to the predetermined distance, e.g., using the scale 15.

A locking element 16, here in the form of a separate pin, is adapted to lock the first part 100 and the second part 101 of the housing 10 against further rotation about the axis of rotation R. The locking element 16 can be inserted through a hole in the second part 101 into a receptacle 17 in the first part 100 when the hole and the receptacle 17 are aligned. The first part 100 may comprise a plurality of such receptacles 17 around its circumference to allow a plurality of locking positions. It is worth noting that other locking mechanisms are conceivable. Alternatively, no locking may be provided, or only the ratchet 18 is used to provide a locking. After use, the needle 11 tip 110 may again be retracted fully into the housing 10, so that no separate needlestick protection is necessary.

Fig. 4 shows a port cannula T for puncturing a port, e.g., the port 2 of Fig. 1. The port cannula T of Fig. 4 comprises a housing 10’ and a needle 11 having a tip 110 as the port catheter 1 of Figs. 2A-3. The housing 10’ of the port catheter T of Fig. 4 comprises a first part 100’ and a second part 10T rotatable with respect to one another to adjust a distance of the needle 11 tip 110 to the housing 10’.

In the example of Fig. 4, the housing 10’, more specifically, the first part 100’ thereof, comprises a base 103 and a plate 104. The base 103 and the plate 104 are connected with one another by means of an elastic element 105. The elastic element 105 may be formed as a spring and, e.g., in the form of a bellows. The elastic element 105 is elastically pretensioned and pushes the plate 104 away from the base 103.

The plate 104 has a through-hole through which the needle 11 is exposed when the plate 104 is moved, against the pretension of the elastic element 105, towards the base 103. In an initial state shown in Fig. 4, the needle 11 tip 110 does not project from the plate 104, and the needle 11 is completely arranged inside the housing 10’.

In order to retract the plate 104, the port catheter T comprises cords 13 and a winch 14. In the example shown, the winch 14 is provided at a needle mount 12’ to which the needle 11 is fixed. The cords 13 connect the needle mount 12’ with the plate 104. One end of each cord 13 is fixed to the needle mount 12’, the winch 14 or another part of the second part 10T of the housing 10’. The other end of each cord 13 is fixed to the plate 104.

The needle mount 12’ in this example is fixed to and a part of the second part 10T of the housing 10’. The winch 14 is formed by a circumferential groove. Projections formed on the first part 100’ of the housing 10’ wind the cords 13 on the winch 14 when the first and second parts 100’, 10T are rotated with respect to one another.

To adjust the needle 11 length, the first and second parts 100’, 10T are rotated to one another, thereby winding the cords 13 on the winch 14. By winding the cords 13 on the winch 14, the plate 104 is pulled and retracted towards the base 103. Thereby, the needle 11 is exposed and the distance of the needle 11 tip 110 to the housing 10’, more specifically: to the plate 104, is increased. To avoid unintentional rotation of the first part 100’ relative to the second part 10T, a locking mechanism is provided. In the example of Fig. 4, the first part 100’ and the second part 10T can be axially (in a direction along the axis of rotation of the first and second parts 100’, 10T to one another) moved with respect to one another, presently between two axial positions. In this regard, the second part 10T comprises a locking element 16’ and the first part 100’ comprises an element configured for locking with the locking element 16’ (or vice versa). The element configured for locking with the locking element 16’ is a receptacle 17’ in this example. Specifically, the second part 10T comprises a plurality of locking elements 16’, each engageable with one of a plurality of receptacles 17’ in the first part 100’. When the locking elements 16’ engage the respective receptacles 17’, a rotation of the first part 100’ with respect to the second part 10T is blocked and thus prevented.

To make an adjustment of the needle 11 length, the second part 10T may be axially moved with respect to the first part 100’ to move the locking elements 16’ out of the respective receptacles 17’ into a groove 108. The groove 108 is formed on the first part 100’. The groove 108 circumferentially extends around the first part about the axis of rotation. When the locking elements 16’ are arranged in the groove 108, the first and second parts 100’, 10T can be rotated with respect to one another. Optionally, a ratchet is provided, e.g., in the groove 108. The ratchet may allow rotation in one direction and prevent rotation in the other direction.

Thus, the locking element 16’ can be brought from a locking state (as shown in Fig. 4) into an unlocking state by a translatory motion of the first and second parts 100’, 10T relative to one another in one direction and/or from the unlocking state into the locking state by a translatory motion of the first and second parts 100’, 10T relative to one another in the other direction. As an option, one locking mechanism (e.g., the one described above) is only provided for unlocking from an initial state in order to make an adjustment, and an additional locking mechanism is provided for locking after adjustment, e.g., with a pin, button or the like, in particular as described further above with respect to Fig. 3.

The port catheter T may also comprise a scale.

In an alternative example, the receptacles 17’ are exchanged by a circumferential groove and in the initial state, the first and second parts 100’, 10T can be rotated freely with respect to one another. By axial movement of the first and second parts 100’, 10T with respect to one another, the base 103 and the second part 10T could be rotationally fixed to one another, e.g., using a ratchet. The winch 14 could then serve as first part of the housing 10’ and be rotatable to the second part 10T and the base 103.

The examples described allow to adjust various different needle lengths, in particular in a defined range, with one type of a needle and port catheter. Thus, instead of numerous differently sized port catheters, only one type of a port catheter for one given needle diameter is necessary. The adjustment is simple and intuitive by rotation. A scale and/or ratchet provide visible and/or audible feedback for a precise adjustment.

Before use, e.g., when the port catheter 1 ; T is arranged in a package, the needle 11 is safely arranged completely in the housing 10; 10’.

Optionally, after use the needle 11 of the port catheter 1 ; T of Figs. 2A-3 and of Fig. 4 may be retracted or re-arranged into the housing 10; 10’ to avoid needlestick injuries.

Figs. 5A to 5C show a first part 100”, e.g., for the port cannula 1 of Figs. 2A-3. The first part 100” may be designed as described with respect to the first part 100 of the port cannula 1 of Figs. 2A-3; however, the first part 100” of Figs. 5A-5C may be designed particularly short. This allows a specifically high comfort when attached to a patient.

According to Figs. 5A-5C, strips 109A, 109B are mounted on the first part 100”. In the present example, the strips 109A, 109B are flexible. Further, the strips 109A, 109B are provided with an adhesive. For example, one side of each of the strips 109A, 109B is provided with an adhesive.

The strips 109A, 109B are fixed to the first part 100” at the end thereof in the direction of the needle 11 tip 110. The strips 109A, 109B may be moved between at least two different conditions. In the present example, the strips 109A, 109B may be moved between three different conditions.

Fig. 5A shows a (first) condition of the first part 100”, wherein the strips 109A, 109B extend along the length of the first part 100” (in parallel to the length of the needle 11). In the present example, the strips 109A, 109B are in planar contact with an outer surface of the first part 100” in the first condition. Here, the first condition is a packaging condition.

In the first condition, the end of the needle 11 having the tip 110 protrudes from the first part 100”. Namely, the needle 11 tip 110 protrudes from the end of the first part 100” by a minimum distance L0. The minimum distance LO corresponds to the minimum needle 11 length. That is, the tip 110 of the needle 11 is arranged outside of the housing. In this condition, the tip 110 of the needle 11 may be covered with a removable cap, as indicated with dashed lines.

Fig. 5B shows a (second) condition of the first part 100”, wherein the strips 109A, 109B extend away from the first part 100”. Here, the strips 109A, 109B extend in opposite directions. More specifically, the strips 109A, 109B extend within the same plane. In the second condition, the strips may be adhered to the patient’s skin 3 by means of the adhesive.

As shown, the needle 11 has also been adjusted as described above and protrudes from the first part 100” by more than the minimum distance L0. In the second condition, the port cannula with the first part 100” may puncture the port 2. The strips 109A, 109B fix the port cannula to the patient’s skin 3. The second condition is a therapy condition.

After use, the strips 109A, 109B are removed from the skin 3 to pull out the needle 11. The needle 11 may be retracted into the housing so that the needle 11 tip 110 only protrudes by the minimum distance L0. The strips 109A, 109B can then be brought in contact with one another. Thereby, the needle 11 tip 110 is enclosed between the strips 109A, 109B. here, the strips 109A, 109B may be adhered to one another with the adhesive. The same side of the strips 109A, 109B that contacted the skin 3 may now contact one another. Thus, the needle 11 tip 110 may be secured by the strips 109A, 109B. The strips 109A, 109B then provide a protection against needlestick injuries, and thereby have a double function.

Fig. 5C shows this (third) condition, which is an after-therapy condition.

The strips 109A, 109B are flexible. To transfer the strips 109A, 109B between the different conditions, the strips 109A, 109B are simply bent accordingly. Alternatively, or in addition, the strips 109A, 109B could be pivotably mounted to the first part 100”.

Hence, the first part 100” with the strips 109A, 109B allows a particularly little length and at the same time provides a needlestick protection.

The idea of the invention is not limited to the embodiments described above but may be implemented in a different fashion. List of Reference Numerals

1 ; T Port cannula

10; 10’ Housing

100; 100’; 100” First part

101 , 101’ Second part

102 Thread

103 Base

104 Plate

105 Elastic element

106 Protrusion

107 Projection

108 Groove

109A, 109B Strip

11 Needle

110 Tip

12; 12’ Needle mount

120 Protrusion

121 Guide

13 Chord

14 Winch

15 Scale

16; 16’ Locking element

17; 17’ Receptacle

18 Ratchet

19 Hose

2 Port

20 Housing

21 Volume

22 Membrane

23 Catheter

3 Skin

L0, L1, L2 Distance

R Axis of rotation

V Inner volume

Claims

1. A port cannula (1 ; 1 ’) for puncturing a port (2), the port cannula (1 ; 1 ’) comprising: a housing (10; 10’) and a needle (11) having a tip (110), characterized in that the housing (10; 10’) comprises a first part (100; 100’; 100”) and a second part (101; 101’) rotatable with respect to one another to adjust a distance (L1, L2) of the needle (11) tip (110) to the housing (10; 10’).

2. The port cannula (1) according to claim 1 , characterized in that the needle (11) is fixed to a needle mount (12) slidably mounted with respect to the first and/or second part (100, 101).

3. The port cannula (1) according to claim 2, characterized in that one of the first part (100) and the second part (101) comprises a thread (102) engaged by the needle mount (12).

4. The port cannula (T) according to claim 1 , characterized in that the first part (100’) comprises a base (103) and a plate (104) movable with respect to one another.

5. The port cannula (T) according to claim 4, characterized in that the base (103) and the plate (104) are connected with one another by means of an elastic element (105).

6. The port cannula (T) according to claim 5, characterized in that the elastic element (105) is pretensioned to push the plate (104) in a direction away from the base (103). The port cannula (T) according to any of claims 4 to 6, characterized in that the needle (11) is fixed to a needle mount (12’), wherein one or more cords (13) connect the needle mount (12’) with the plate (104). The port cannula (T) according to claim 7, characterized by a winch (14), wherein the one or more cords (13) are woundable on the winch (14) by rotation of the first part (100’) relative to the second part (10T). The port cannula (1 ; T) according to any of the preceding claims, characterized in that in an initial state, the needle tip (110) is arranged inside the housing (10; 10’), wherein rotation of the first part (100; 100’) with respect to the second part (101 ; 10T) arranges the needle tip (110) out of the housing (10; 10’). The port cannula (1 ; T) according to any of the preceding claims, characterized in that a scale (15) is provided on the housing (10; 10’), wherein rotation of the first part (100; 100’) with respect to the second part (101; 10T) adjusts an indication of the distance (L1, L2) of the needle (11) tip (110) to the housing (10; 10’) on the scale (15). The port cannula (1 ; T) according to any of the preceding claims, characterized by a locking element (16; 16’) having an unlocking state and a locking state and being adapted for locking the first part (100; 100’) and the second part (101; 10T) with respect to one another in the locking state. The port cannula (T) according to claim 11, characterized in that the locking element (16’) is a protrusion of one of the first and second parts (100; 100’, 101 ; 10T) engaging a receptacle (17’) of the other one of the first and second parts (100; 100’, 101 ; 10T) in the locking state and/or that the first and second parts (100’, 10T) are rotatable with respect to one another about an axis of rotation (R), wherein the locking element (16’) can be brought into the locking state by a translatory motion of the first and second parts (100’, 10T) relative to one another.

13. The port cannula (1’) according to any of the preceding claims, characterized in that adhesive strips (109A, 109B) are mounted on the first part (100”). 14. The port cannula (1 ; T) according to any of the preceding claims, characterized by a ratchet (18) adapted for providing haptic and/or audible feedback to a rotation of the first part (100; 100’) with respect to the second part (101 ; 101 ’). 15. A method for adjusting the port cannula (1 ; T) according to any of the preceding claims, characterized by: providing a predetermined distance of the needle (11) tip (110) to the housing (10; 10’); and - rotating the first part (100; 100’) with respect to the second part (101 ; 10T) until the distance (L1, L2) of the needle (11) tip (110) to the housing (10; 10’) corresponds to the predetermined distance.