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OMB
APPROVAL
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OMB
Number: 3235-0145
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Expires:
February 28, 2009
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Estimated
average burden
Hours
per response 10.4
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-----------------------------------
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CUSIP
No. 042698308
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-----------------------------------
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----------------------------------------------------------------------------------------------------
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1. Names
of Reporting Persons
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I.R.S.
Identification Nos. of above persons (entities only)
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Healthinvest
Partners AB
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-----------------------------------------------------------------------------------------------------
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2. Check
the Appropriate Box if a Member of a Group (See
Instructions)
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(a)
[ ]
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(b)
[X]
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-----------------------------------------------------------------------------------------------------
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3. SEC
Use Only
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-----------------------------------------------------------------------------------------------------
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4. Citizenship
or Place of Organization
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Sweden
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-----------------------------------------------------------------------------------------------------
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Number
of 5. Sole
Voting Power 145,300
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Shares -------------------------------------------------------------------------
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Beneficially 6. Shared
Voting Power 0
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Owned
by -------------------------------------------------------------------------
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Each 7. Sole
Dispositive Power 145,300
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Reporting -------------------------------------------------------------------------
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Person
With: 8. Shared
Dispositive Power 0
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----------------------------------------------------------------------------------------------------
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9. Aggregate
Amount Beneficially Owned by Each Reporting Person
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145,300
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----------------------------------------------------------------------------------------------------
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10. Check
if the Aggregate Amount in Row (9) Excludes Certain
Shares
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(See Instructions) [
]
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----------------------------------------------------------------------------------------------------
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11. Percent
of Class Represented by Amount in Row (9)
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5.4%
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----------------------------------------------------------------------------------------------------
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12. Type
of Reporting Person (See Instructions)
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IA,
HC
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-----------------------------------
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CUSIP
No. 042698308
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-----------------------------------
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----------------------------------------------------------------------------------------------------
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1. Names
of Reporting Persons
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I.R.S. Identification Nos. of above persons (entities
only)
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HealthInvest
Global Long/Short Fund
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-----------------------------------------------------------------------------------------------------
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2. Check
the Appropriate Box if a Member of a Group (See
Instructions)
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(a)
[ ]
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(b)
[X]
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-----------------------------------------------------------------------------------------------------
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3. SEC
Use Only
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-----------------------------------------------------------------------------------------------------
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4. Citizenship
or Place of Organization
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Sweden
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-----------------------------------------------------------------------------------------------------
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Number
of 5. Sole
Voting Power 145,300
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Shares -------------------------------------------------------------------------
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Beneficially 6. Shared
Voting Power 0
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owned
by -------------------------------------------------------------------------
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Each 7. Sole
Dispositive Power 145,300
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Reporting -------------------------------------------------------------------------
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Person
With: 8. Shared
Dispositive Power 0
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----------------------------------------------------------------------------------------------------
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9.
Aggregate
Amount Beneficially Owned by Each Reporting Person
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145,300
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----------------------------------------------------------------------------------------------------
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10. Check
if the Aggregate Amount in Row (9) Excludes Certain
Shares
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(See Instructions) [
]
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----------------------------------------------------------------------------------------------------
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11. Percent
of Class Represented by Amount in Row (9)
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5.4%
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----------------------------------------------------------------------------------------------------
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12. Type
of Reporting Person (See Instructions)
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OO
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----------------------------------------------------------------------------------------------------
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Item
1(a). Name
of Issuer:
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Arrhythmia Research Technology, Inc.
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Item
1(b). Address
of Issuer's Principal Executive Offices:
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25 Sawyer Passway
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Fitchburg, Massachusetts 01420
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Item
2(a). Name
of Persons Filing:
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Healthinvest Partners AB and HealthInvest Global Long/Short
Fund
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Healthinvest Partners AB is the investment advisor and control person
of
HealthInvest Global
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Long/Short Fund, a security holder of the Issuer. HealthInvest Global
Long/Short Fund is a
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specialty fund organized pursuant to the Swedish Mutual Funds Act.
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Item
2(b). Address
of Principal Business Office or, if none, Residence:
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Arsenalsgatan 4
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SE-111 47 Stockholm
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Sweden
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Item
2(c).
Citizenship:
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See the response(s) to Item 4 on the attached cover
page(s).
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Item
2(d). Title
of Class of Securities:
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Common Stock
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Item
2(e). CUSIP
Number:
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042698308
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Item
3.
If
this statement is filed pursuant to Rules 13d-1(b) or 13d-2(b) or
(c),
check whether the person
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filing is a:
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Not
Applicable
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Item
4.
Ownership
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(a). Amount
beneficially owned:
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See
the response(s)
to Item 9 on the attached cover page(s).
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(b). Percent
of Class:
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See the response(s) to Item 11 on the attached cover
page(s).
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(c). Number
of shares as to which the person has:
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(i). Sole
power to vote or to direct the vote: See the response(s) to Item
5 on the
attached cover
page(s).
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(ii).
Shared
power to vote or to direct the vote: See the response(s) to Item
6 on
the
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attached
cover page(s).
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(iii). Sole
power to dispose or to direct the disposition of: See the response(s)
to
Item 7
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on the attached cover page(s).
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(iv). Shared
power to dispose or to direct the disposition of: See the response(s)
to
Item 8
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on the attached cover page(s).
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Item
5. Ownership
of five percent or less of a class.
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Not
Applicable
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Item
6. Ownership
of more than five percent on behalf of another person.
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Not
Applicable
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Item
7.
Identification
and Classification of the Subsidiary which acquired the Security
being
reported on
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by
the Parent
Holding Company.
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Not
Applicable
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Item
8. Identification
and Classification of Members of the Group.
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Not
Applicable
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Item
9. Notice
of Dissolution of Group.
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Not
Applicable
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Item
10.
Certification.
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By signing below I certify that, to the best of my knowledge and
belief,
the securities referred to
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above were not acquired and are not held for the purpose of or with
the
effect of changing or
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influencing the control of the issuer of the securities and were
not
acquired and are not held in
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connection with or as a participant in any transaction having that
purpose
or effect.
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SIGNATURE
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After
reasonable inquiry and to the best of my knowledge and belief, I
certify
that the information set forth in this statement is true, complete
and
correct.
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Date: December
6, 2006
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HEALTHINVEST
PARTNERS AB
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By:
/s/ ANDERS HALLBERG
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--------------------------------------------------
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Name: Anders
Hallberg
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Title: Managing
Director and CEO
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HEALTHINVEST
GLOBAL LONG/SHORT FUND
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By:
/s/ ANDERS HALLBERG
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-------------------------------------------------
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Name: Anders
Hallberg
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Title: CEO
of Managing Company
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