CN111228615B - Insulin pen needle capable of preventing false puncture - Google Patents

Abstract

The invention relates to the technical field of medical appliances, and particularly discloses an anti-false-puncturing insulin pen needle which at least comprises a needle seat, a needle body, a seat sleeve, a protective cover, a trigger seat and an elastic piece positioned between the needle seat and the trigger seat. The anti-false-puncturing insulin pen needle disclosed by the invention has the advantages that the front end of the needle body is completely covered by the shield in the initial state and the triggered state, so that the needle head is not exposed in the initial state and the triggered state, and the user is prevented from being injured by accident; in addition, the trigger seat is positioned in the shield, the trigger structure is completely hidden in the shield, and the protection structure of the insulin pen needle can be effectively prevented from being triggered due to the fact that the trigger mechanism is touched by mistake; the invisible triggering form is formed by the combination of the needle seat, the triggering seat, the protective cover and the seat sleeve, and the invisible triggering form has the technical advantages of simple fittings, simple structure, ingenious conception and good structural safety.

Description

Insulin pen needle capable of preventing false puncture

Technical Field

The invention relates to the technical field of medical appliances, in particular to an anti-false-puncturing insulin pen needle.

Background

The insulin pen needle is a conventional insulin injection device which is used for being matched with an insulin pen type injector to inject insulin when treating diabetes, and has the main function of accurately infusing insulin into a diabetic patient through the injection device so as to achieve the aim of controlling the blood sugar of the patient. Based on safety requirements, in order to prevent the needle after injection from being exposed to injure a user accidentally, the existing insulin pen needle is generally provided with a safety protection structure to prevent the needle after injection from being exposed. In the prior art, the types of the safety protection structures are various, and the advantages and disadvantages of the safety protection structures of all types are different.

The insulin pen needle in the prior art has the following defects:

(1) The needle point shielding structure only shields the needle point after triggering, and in the initial state, the needle point is exposed, and before use, the risk of false puncture injury to a user exists;

(2) The trigger mechanism for triggering the protective cover is usually exposed, so that when the protective cover is subjected to external force, the false triggering phenomenon is easy to occur, and once the protective cover is triggered by mistake, the waste of the insulin pen needle is necessarily caused.

Disclosure of Invention

The invention aims to provide an anti-false-puncturing insulin pen needle, which aims to solve the technical defect of the insulin pen needle in the prior art.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: an anti-misplug insulin pen needle, comprising at least:

the needle stand comprises a front stand body and a rear stand body, a limit step facing one side of the front stand body is formed between the front stand body and the rear stand body, and a connecting cavity is formed in the rear stand body;

the needle body axially penetrates through the needle seat, the tail end of the needle body is positioned in the connecting cavity, and the front end of the needle body extends out of the free end of the front seat body;

the seat sleeve is sleeved on the needle seat, one end of the seat sleeve is fixedly connected with the free end of the rear seat body, the other end of the seat sleeve is open, and a first cavity is arranged between the inner wall of the seat sleeve and the outer wall of the needle seat;

the needle body extending out of the front seat body is completely covered by the shield in a protection state, a second cavity is formed in the shield, a contact end is arranged at the front end of the shield, a needle passing hole for accommodating the needle body to pass through is formed in the contact end, at least one group of axial guide mechanisms are arranged between the shield and the inner wall of the seat cover, and at least one group of axial anti-disengaging mechanisms are arranged between the tail end of the shield and the free end of the seat cover;

the trigger seat is arranged in the second cavity and can at least rotate circumferentially relative to the shield in the second cavity, the shield and the trigger seat can axially move relative to the needle seat in the first cavity, and at least one group of circumferential rotation guide mechanisms and at least one group of axial recovery prevention mechanisms are arranged between the trigger seat and the needle seat or the seat sleeve;

the elastic piece is arranged between the needle seat and the trigger seat along the axial direction.

In a preferred embodiment, the axial guiding mechanism at least comprises a guiding groove and a guiding block matched with the guiding groove, the guiding groove is axially arranged on the inner wall of the seat cover, and the guiding block is radially arranged on the outer wall of the protecting cover in a protruding mode.

In a preferred embodiment, the guide groove is provided with a guide groove flange at the front end of the seat sleeve, the guide block is provided with an abutting surface at the position facing the front end of the shield, and the guide groove flange and the abutting surface form the axial anti-disengagement mechanism.

In a preferred embodiment, the guide block is disposed at the tail end of the shield.

A preferred embodiment, the circumferential rotation guide mechanism includes at least:

the guide lug is arranged on the front seat body in a protruding manner along the radial direction, at least one side of the guide lug is provided with a first guide surface, and the first guide surface extends from one end close to the front seat body to one end of the rear seat body along the circumferential direction and the axial direction synchronously;

the guide arm is arranged at the rear end of the trigger seat in an axially protruding mode, and at least one side of the guide arm is provided with a second guide surface matched with the first guide surface.

In a preferred embodiment, the guide projection is provided with first guide surfaces on both sides thereof, and the guide arm is provided with second guide surfaces on both sides thereof, which are adapted to the first guide surfaces, and which are symmetrical to each other.

In a preferred embodiment, the rear end of the trigger seat is further arranged on at least one elastic arm in a protruding mode, and the free end of the elastic arm is provided with an elastic protruding block protruding out of the elastic arm in a radial mode.

In a preferred embodiment, a first limit groove for accommodating the elastic bump is formed in the position, close to the front end, of the inner wall of the seat cover, a second limit groove for accommodating the elastic bump is formed in at least one side of the first limit groove, and the position of the second limit groove relative to the first limit groove is adapted to the position of the trigger seat relative to the seat cover after rotation; the first limiting groove is provided with a first groove bottom flange, the second limiting groove is provided with a second groove bottom flange, wherein the first groove bottom flange is closer to the front end of the seat cover relative to the second groove bottom flange, and one side away from the first limiting groove and the second limiting groove is provided with a third limiting groove for accommodating the elastic lug to synchronously move along the circumferential direction and the axial direction.

In a preferred embodiment, a third guiding surface is disposed on a side, facing the third limiting groove, of the second groove bottom flange, a fourth guiding surface adapted to the third guiding surface is disposed on a side, facing the front end of the trigger seat, of the elastic protruding block, and the elastic protruding block and the second limiting groove form the axial anti-recovery mechanism.

A clamping mechanism is arranged between the needle seat and the seat sleeve and comprises a clamping piece arranged on the needle seat and a clamping groove arranged on the inner side of the seat sleeve and matched with the clamping piece.

Compared with the prior art, the anti-false-puncturing insulin pen needle has the following technical advantages:

(1) In this embodiment, the shield completely covers the front end of the needle body in both the initial state and the triggered state, so that the needle is not exposed in both the initial state and the triggered state, thereby avoiding the user from being injured by a mistake.

(2) The trigger seat is positioned in the shield, the trigger structure is completely hidden in the shield, and the protection structure of the insulin pen needle can be effectively prevented from being triggered due to the fact that the trigger mechanism is touched by mistake.

(3) The invisible triggering form is formed by the combination of the needle seat, the triggering seat, the protective cover and the seat sleeve, and the invisible triggering form has the technical advantages of simple fittings, simple structure, ingenious conception and good structural safety.

Drawings

FIG. 1 is a schematic diagram showing an explosion state structure of an anti-false-puncturing insulin pen needle according to the first embodiment;

FIG. 2 is a schematic diagram showing a sectional structure of an anti-erroneous-puncturing insulin pen needle according to the first embodiment;

fig. 3 is a schematic view of a first state structure of a needle holder according to the first embodiment;

fig. 4 is a schematic view of a second state structure of the needle holder in the first embodiment;

FIG. 5 is a schematic view showing a first state structure of a seat cover according to the first embodiment;

FIG. 6 is a schematic view showing a second state structure of a seat cover according to the first embodiment;

FIG. 7 is a schematic sectional view of a sleeve according to the first embodiment;

FIG. 8 is a schematic view showing a third state structure of a seat cover according to the first embodiment;

FIG. 9 is a schematic view showing a first state structure of a shield according to the first embodiment;

FIG. 10 is a schematic view showing a second state structure of the shield according to the first embodiment;

FIG. 11 is a schematic view illustrating a first state structure of a trigger seat according to the first embodiment;

FIG. 12 is a schematic view showing a second state structure of the trigger seat according to the first embodiment;

FIG. 13 is a schematic view of the structure of the housing in the first embodiment;

fig. 14 is a schematic view showing the positional relationship among the needle holder, trigger holder and shield in the initial state;

fig. 15 is a schematic view showing the positional relationship among the needle holder, the trigger holder and the shield in the first compressed state in which the first guide surface and the second guide surface come into contact;

fig. 16 is a schematic view showing the positional relationship among the needle holder, the trigger holder and the shield in the second compressed state, in which the trigger holder is rotated by a certain angle under the interaction of the first guide surface and the second guide surface;

fig. 17 is a schematic view showing the positional relationship between the needle holder and the trigger holder in the state shown in fig. 16;

fig. 18 is a schematic view showing the positional relationship among the needle holder, trigger holder and shield in the third compressed state, i.e., the injection state;

fig. 19 is a schematic view showing the positional relationship between the needle holder and the trigger holder in the state shown in fig. 18;

fig. 20 is a schematic view of the positional relationship among the needle hub, trigger seat and shield after triggering;

fig. 21 is a schematic diagram of a positional relationship between a needle holder and a trigger seat in an initial state in the second embodiment;

fig. 22 is a schematic structural view of a seat cover in the second embodiment.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1

As shown in fig. 1 and 2, the anti-false-puncturing insulin pen needle of the present embodiment includes a needle holder 10, a sleeve 20, a needle body 70, a shield 30, a trigger holder 40, a housing 50, and an elastic member 60. In this embodiment, the end that contacts the patient is defined as the front end, and the end that is close to the insulin pen injector is defined as the rear end.

The structure of the needle holder 10 is shown in fig. 2 and 3, and includes a front holder 11 and a rear holder 12, between which a limit step 15 facing to one side of the front holder is formed. Wherein, the back seat body is provided with a connecting cavity 16, and an internal thread 17 is arranged in the connecting cavity and is used for being connected with the insulin pen type injector.

In this embodiment, the needle body 70 is axially disposed through the needle holder 10, the tail end of the needle body 70 is located in the connecting cavity 16, and the front end of the needle body 70 extends from the free end of the front seat.

In this embodiment, the front seat 11 is provided with a pair of guide protrusions 14 protruding from the front seat in the radial direction, and the guide protrusions 14 are uniformly distributed in the circumferential direction. The guide projection 14 is provided at one side thereof with a first guide surface 141, and the first guide surface 141 extends from an end near the front body toward an end of the rear body in synchronization with the axial direction in the circumferential direction.

In this embodiment, a ring edge 18 is disposed at the rear end of the rear seat body 12, and a pair of clamping members 19 are uniformly distributed on the outer periphery of the ring edge 18 along the circumferential direction. Preferably, the clip 19 includes a first clip 192 extending in an axial direction and a second clip 191 symmetrically disposed on either side of the first clip.

The sleeve 20 of the present embodiment is sleeved on the needle stand 10. The seat cover 20 is open at the front end and fixedly connected with the free end of the rear seat body at the rear end. A preferred connection manner is shown in fig. 5 and 7, wherein the inner wall of the rear end of the sleeve 20 is provided with a clamping groove 26 adapted to be connected with the clamping piece 19. Preferably, the clamping groove 26 comprises a first clamping groove 262 extending axially and adapted to the first clamping piece, and a second clamping groove 261 symmetrically distributed on two sides of the first clamping groove 262 and adapted to be connected with the second clamping piece. The connecting mode is that the seat cover is usually made of plastic materials, has certain deformability, and uses certain pressure to enable the tail end of the seat cover to generate certain deformation, so that the clamping piece can enter the clamping groove. The first clamping piece and the first clamping groove are matched to limit relative rotation in the circumferential direction, and the second clamping piece and the second clamping groove are matched to limit relative displacement in the axial direction. Has the technical advantages of simple structure, convenient installation and good structural stability.

As shown in fig. 2, after the sleeve 20 of the present embodiment is connected to the needle holder 10, a first cavity 80 is formed between the inner wall of the sleeve and the outer wall of the needle holder, wherein the shield 30 and the trigger seat 40 can move in the first cavity 80.

As shown in fig. 5 to 7, the seat cover 20 of the present embodiment has a pair of first limiting grooves 21 uniformly distributed along the circumferential direction at the position of the inner wall near the front end, and a second limiting groove 23 is provided at one side of the first limiting groove 21. Wherein, first spacing groove is equipped with first tank bottom flange 211, and the second spacing groove is equipped with second tank bottom flange 25 to first tank bottom flange is close to the front end of seat cover relative second tank bottom flange, keeps away from one side of first spacing groove and second spacing groove is provided with third spacing groove 22.

As shown in fig. 8, the inner wall of the sleeve 20 of the present embodiment is also provided with a pair of guide grooves 29 uniformly distributed along the circumferential direction, and the guide grooves 29 are provided to extend in the axial direction. The guide groove 29 is provided with a guide groove flange 291 at a position near the front end.

In this embodiment, the shield 30 may completely cover the needle extending from the front housing in the shielded state. The protection state comprises two states, namely an initial state before use and a state after use triggering.

As shown in fig. 9 and 10, the shield 30 of the present embodiment is provided with a second cavity 35 for accommodating the trigger seat therein, the front end of the shield 30 is provided with a contact end 31 for contacting with a patient, and the contact end 31 is provided with a needle passing hole 32 for accommodating the needle passing therethrough.

Wherein, the tail end of the shield 30 is uniformly provided with a pair of guide blocks 33 matched with the guide grooves 29 along the circumferential direction, and the guide blocks 33 are arranged on the outer wall of the shield in a protruding way along the radial direction. In this embodiment, the cooperation of the guide groove 29 and the guide block 33 forms an axial guide mechanism, so that the shield can only move axially relative to the seat cover.

Wherein, the guide block is provided with an abutting surface 34 at a position facing the front end of the shield, and the abutting surface 34 is matched with the inner side of the guide groove flange 291 to form an axial anti-disengaging mechanism. The engagement of the abutment surface 34 with the guide slot lip 291 prevents axial disengagement of the shroud from the sleeve, both in the initial condition shown in fig. 2 and in the triggered condition.

As shown in fig. 2, the trigger seat 40 of the present embodiment is located in the second cavity 35 and moves at least circumferentially and axially relative to the shroud within the second cavity.

As shown in fig. 11 and 12, the trigger seat 40 of the present embodiment is provided with a spring cavity 45 inside, and a bottom of the spring cavity is provided with a baffle 46 distributed in a ring shape, and the baffle 46 has an opening for accommodating the needle passing through. Wherein, the elastic piece 60 is arranged between the needle seat and the trigger seat along the axial direction. Preferably, the elastic member 60 in the present embodiment employs a spring. Under the action of the spring, the trigger seat 40 is held in the second cavity 35, and the baffle 46 is held in contact with the cavity bottom 36 of the second cavity 35.

In this embodiment, as shown in fig. 11 and 12, the rear end of the trigger seat 40 is provided with a pair of guide arms 43 protruding in the axial direction, and the pair of guide arms 43 are uniformly distributed in the circumferential direction. Wherein one side of the guiding arm is provided with a second guiding surface 44 adapted to said first guiding surface. Wherein the cooperation of the second guiding surface on the guiding arm and the first guiding surface on the guiding projection forms the circumferential rotation guiding mechanism of the embodiment for guiding the trigger seat to rotate relative to the needle seat.

In this embodiment, the circumferential rotation guide mechanism is disposed between the needle holder and the trigger holder, and as an equivalent embodiment, the circumferential rotation guide mechanism may be disposed between the sleeve and the trigger holder.

In this embodiment, the rear end of the trigger seat is further provided with a pair of elastic arms 41 protruding in the axial direction, and the pair of elastic arms are uniformly distributed in the circumferential direction. The free end of the elastic arm 41 is provided with an elastic bump 42 protruding radially from the elastic arm.

In the initial state, the elastic protruding block 42 is located in the first limiting groove 21, and in the process of compressing the shroud, the elastic protruding block 42 enters the third limiting groove 22 from the first limiting groove 21, and under the guiding action of the circumferential rotation guiding mechanism, the elastic protruding block 42 rotates to the rear of the second limiting groove in the third limiting groove. When the injection is completed, under the potential energy of the spring, the elastic lug 42 crosses the second groove bottom flange 25 and enters the second limit groove. Preferably, in order to facilitate the elastic bump 42 to smoothly cross the second groove bottom flange 25, a third guiding surface 251 is disposed on a side of the second groove bottom flange 25 facing the third limiting groove, and a fourth guiding surface 421 adapted to the third guiding surface 251 is disposed on a side of the elastic bump facing the front end of the trigger seat. In this state, when the shield is compressed again, since the front end face 422 of the elastic projection interacts with the groove bottom 252 of the second groove bottom flange 25, the elastic projection 42 is difficult to cross the second groove bottom flange 25 again into the third limit groove under the action of the nondestructive force, so that an axial recovery prevention mechanism is formed, the needle body is prevented from being exposed outside the shield again, and the safety protection effect is reliable.

As shown in fig. 13, the housing 50 of the present embodiment has a housing cavity 51 for covering the outside of the seat cover and the shield in the unused state and the state after the use triggering. Wherein, the outer side of the outer end of the shell 50 is provided with an annular convex edge 53, and the inner side is uniformly provided with a plurality of guide clamping grooves 52 along the circumferential direction. Corresponding to the above. The rear outer side of the seat cover 20 is provided with an annular flange 27, and one side of the annular flange facing the front end of the seat cover is provided with a plurality of guide clamping pieces 28 matched with the guide clamping grooves 52. It should be noted that, the number of the guiding slots 52 is greater than the number of the guiding clips 28, which is advantageous in that no deliberate alignment is needed, and convenience of operation is enhanced.

Fig. 14 to 20 are schematic views showing a state change from an initial state to a use trigger of the anti-false-puncturing insulin pen needle according to the present embodiment. Wherein, in the state shown in fig. 14, in the initial state, the shield completely covers the needle body under the action of the spring.

When insulin needs to be injected into a patient, the contact end of the shield presses against the patient's skin and applies pressure to the patient's side. In the process, as shown in fig. 15, the spring is compressed and the needle is gradually exposed from the shield and into the patient's skin. In the state shown in fig. 15, the first guide surface comes into contact with the second guide surface.

After the first guide surface and the second guide surface come into contact, the trigger seat rotates relative to the needle seat under the interaction of the first guide surface and the second guide surface when the trigger seat is continuously pressed, and fig. 16 and 17 show the rotated state.

The pressing is continued to the state shown in fig. 18 and 19, which is an injection state, and the end of the guide arm is in contact with the limit step. After the injection is completed, the needle body is pulled out of the skin of the patient, and the trigger seat and the shield move axially to the state shown in fig. 20 under the potential energy of the spring. In this state, the shield completely covers the needle body, and the needle body cannot be exposed from the shield any more under the action of the recovery prevention mechanism.

Example two

The principle of this embodiment is the same as that of the first embodiment, except that, as shown in fig. 21, a pair of first guide surfaces 141 symmetrical to each other are provided on both sides of the guide projection 14, and correspondingly, a pair of second guide surfaces 44 matched with the first guide surfaces symmetrical to each other are provided on both sides of the guide arm 43. The structure has the advantages that the rotation direction of the trigger seat is not unique, and the trigger seat can rotate clockwise and anticlockwise relative to the needle seat.

As shown in fig. 22, in order to realize the bidirectional rotation of the trigger seat, a pair of second limiting grooves 23 symmetrical to each other are provided on both sides of the first limiting groove 21.

In summary, the foregoing description is only of the preferred embodiments of the invention, and is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (7)

1. An anti-misplug insulin pen needle, comprising at least:

the needle stand (10) comprises a front seat body (11) and a rear seat body (12), a limit step (15) facing one side of the front seat body is formed between the front seat body and the rear seat body, and a connecting cavity (16) is formed in the rear seat body;

the needle body (70) axially penetrates through the needle seat, the tail end of the needle body is positioned in the connecting cavity, and the front end of the needle body extends out of the free end of the front seat body;

the seat sleeve (20) is sleeved on the needle seat, one end of the seat sleeve is fixedly connected with the free end of the rear seat body, the other end of the seat sleeve is open, and a first cavity (80) is arranged between the inner wall of the seat sleeve and the outer wall of the needle seat;

the protective cover (30) completely covers the needle body extending out of the front seat body in a protective state, a second cavity (35) is arranged in the protective cover, a contact end (31) is arranged at the front end of the protective cover, a needle passing hole (32) for accommodating the needle body to pass through is formed in the contact end, at least one group of axial guide mechanisms are arranged between the protective cover and the inner wall of the seat cover, the protective cover can axially move in the first cavity along the axial guide mechanisms, and at least one group of axial anti-disengaging mechanisms are arranged between the tail end of the protective cover and the free end of the seat cover;

the trigger seat (40) is arranged in the second cavity and can at least rotate circumferentially relative to the shield in the second cavity, the trigger seat can axially move along with the shield in the first cavity, and at least one group of axial recovery prevention mechanisms are arranged between the trigger seat and the seat sleeve;

an elastic member (60) disposed between the needle mount and the trigger mount in an axial direction;

the axial guide mechanism is characterized by at least comprising a guide groove (29) and a guide block (33) matched with the guide groove, wherein the guide groove is axially arranged on the inner wall of the seat cover, the guide block is radially arranged on the outer wall of the shield in a protruding mode, a guide groove flange (291) is arranged at the front end position of the seat cover, an abutting surface (34) is arranged at the position, facing the front end of the shield, of the guide block, and the guide groove flange and the abutting surface form the axial anti-disengaging mechanism;

at least one group of circumferential rotation guide mechanisms are arranged between the trigger seat and the needle seat; the circumferential rotation guide mechanism includes at least:

a guide projection (14) which is radially projected on the front seat body, at least one side of the guide projection being provided with a first guide surface (141) which extends from one end close to the front seat body to one end of the rear seat body in synchronization with the axial direction in the circumferential direction;

a guide arm (43) protruding from the rear end of the trigger seat in the axial direction, at least one side of the guide arm being provided with a second guide surface (44) that is adapted to the first guide surface;

when the first guide surface and the second guide surface start to contact and then continue to press, the trigger seat rotates relative to the needle seat under the interaction of the first guide surface and the second guide surface.

2. The anti-false-puncturing insulin pen needle as claimed in claim 1, wherein the two sides of the guide projection are provided with first guide surfaces which are symmetrical to each other, and the two sides of the guide arm are provided with second guide surfaces which are symmetrical to each other and are matched with the first guide surfaces.

3. The anti-false-puncturing insulin pen needle according to claim 1 or 2, characterized in that the rear end of the trigger seat is further convexly arranged on at least one elastic arm (41), and the free end of the elastic arm is provided with an elastic lug (42) radially protruding from the elastic arm.

4. A false-puncturing-preventing insulin pen needle as claimed in claim 3, wherein a first limit groove (21) for accommodating the elastic lug is arranged on the inner wall of the seat sleeve at a position close to the front end, a second limit groove (23) for accommodating the elastic lug is arranged on at least one side of the first limit groove, and the position of the second limit groove relative to the first limit groove is adapted to the position of the trigger seat relative to the seat sleeve after rotation; the first limiting groove is provided with a first groove bottom flange (211), the second limiting groove is provided with a second groove bottom flange (25), wherein the first groove bottom flange is closer to the front end of the seat cover relative to the second groove bottom flange, one side away from the first limiting groove and the second limiting groove is provided with a third limiting groove (22) for accommodating the elastic protruding blocks to synchronously move along the circumferential direction and the axial direction.

5. The false-puncturing-preventing insulin pen needle as claimed in claim 4, wherein a third guiding surface (251) is arranged on one side of the second groove bottom flange facing the third limiting groove, a fourth guiding surface (421) matched with the third guiding surface is arranged on one side of the elastic protruding block facing the front end of the trigger seat, and the elastic protruding block and the second limiting groove form the axial restoring-preventing mechanism.

6. The anti-false-puncturing insulin pen needle according to any one of claims 1-2 or 4-5, wherein a clamping mechanism is arranged between the needle seat and the seat cover, and comprises a clamping piece (19) arranged on the needle seat and a clamping groove (26) arranged on the inner side of the seat cover and matched with the clamping piece.

7. The anti-misplug insulin pen needle as in any one of claims 1-2 or 4-5, further comprising a housing (50) for covering the exterior of the sleeve and shield.